Results for search term: 2
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DescriptionImages

NGC5204

NGC 5204 is a dwarf, very blue, spiral galaxy of the Magellanic class, that is barely recognizable as a spiral, about 15 million light-years distant in Ursa Major. It is considered a companion to be one of 4 easily resolved, blue companions to M101 though M101 is over 6 degrees to its southeast, far out of my image frame. It is listed as having a lot of HII regions which show up as blue in my image due to the large number of very young, blue hot stars they contain. This is another one that could benefit from H alpha data. Fortunately, its redshift is low enough that my 6nm filter should work. It was discovered by William Herschel on April 24, 1789. It is in the second H400 program.

I was surprised to find a quasar candidate seen through the galaxy. It is marked in the annotated image. Several galaxies are also seen through its disk though none had redshift data so I didn't include them in the annotated image. The bright part of its disk is 16,000 light-years across but if you include the very faint outer reaches it is about 24,000 light-years across. Being so close it shows a lot of interesting detail right into its core region.

To its northeast is the odd galaxy LEDA 2579321. It has a very off-center core to its northeastern end and an odd plume coming away from the galaxy. At least I assume it is a plume. NED shows nothing for its position. Otherwise, I'd have considered it a different galaxy, likely one even more distant. But considering how something has moved the core of this galaxy so far off center I suspect whatever that cause it may have created the plume as well. It also has an odd bright blue star cloud toward the southwest end. I wish we were closer to this one and could see better what's going on here.

The galaxy CGCG 294-040 to the southeast of NGC 5204 is classified as an elliptical galaxy but it looks more like a compact spiral to my eye. But both NED and the NGC project consider it an elliptical.

Two AGN galaxies lie about 900 million light-years distant on the right edge of my image. They are likely related. I have to wonder if they may have passed close to each other feeding their black holes sufficiently to create their AGN status.

There are several more galaxy clusters in the field than I have annotated. I only list those with an obvious bright cluster galaxy at its heart that is listed at NED. Some were so vague I couldn't really tell what to point to as they had a large error circle and no core galaxy, just a few possible faint galaxies in the area. Then there are groups I'd have thought were clusters that aren't listed at NED. Maybe they are just a random gathering of unrelated background galaxies at varying distances.

This was taken on one of the very few good nights this last May. Unfortunately by this time of the year (May 29) I can get only one object a night this time of the year.

14" LX200 @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Rick


NGC5204L4X10RGB2X10.JPG


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NGC5211

NGC 5211 is a rather strange spiral galaxy in Virgo 170 to 180 million light-years distant. It is classified by NED as (R')SAB(rs)ab pec though the NGC project says Sb/SBb apparently undecided if it is a barred spiral or not. Some sources say it is similar to NGC 210 though NED and the NGC project classifies that as SAB(s)b (no ring). So by the NGC project, they are similar and by NED they aren't. To me it is similar in that the outer arms start from the ends of very faint bars extending out from an inner disk.

NGC 5211 was discovered by John Herschel on April 14, 1828 (Edit: I originally incorrectly credit it to his dad). It is a rather large galaxy. I get a diameter of about 112,000 light-years assuming the 180 million light-year distant. It has one apparent true companion UGC 8526. It has a slightly larger redshift putting it at 190 million light-years. Since relative velocities can easily account for this difference it is likely they are closer to the same distance than redshift indicates. It is a much smaller spiral being only a bit over 41,000 light-years across. NED classifies it simply as S? Other sources call it a blue compact galaxy. It looks like an Sbc to my untrained eye. It is about the same size as M33 but has a much higher surface brightness and star density than M33.

While the field is near the edge of the Virgo Cluster none of that cluster's galaxies are in the image. In fact, all are well beyond the cluster. Most that NED has redshift data on are more than a billion light-years distant with one at almost 6 billion light-years. Thus most are quite faint. The faintest I found redshift data for was Magnitude 22.9 indicating this night was more transparent than I've had in months. Unfortunately seeing wasn't as great.

To recap some abbreviations used in the annotated image. "p" means it is a photographic redshift rather than the more accurate spectroscopic redshift. NLAGN stands for Narrow Line Active Galactic Nucleus indicating it is a close cousin to a quasar. BLAGN is Broad Line Active Galactic Nucleus http://ned.ipac.caltech.edu/level5/Sept09/Gaskell/frames.html This link is by an astronomer I've worked with and know well. ELG means an emission line galaxy where emission lines are obvious in its spectrum http://www.usm.uni-muenchen.de/people/saglia/praktikum/galspectra/node4.html . NELG means narrow emission line galaxy. LINER means Low-Ionization Nuclear Emission-line Region http://ned.ipac.caltech.edu/level5/Glossary/Essay_liner.html .

14" LX200R, L=4x10' RGB=2x10", STL-11000XM, Paramount ME


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NGC5247

NGC 5247 is a rather nearby galaxy in southern Virgo below my 15-degree limit. Due to clouds in the north I had open sky only to the south and seeing was above average allowing me to give it a try. It was on my list for two reasons. One it has two main arms but a third arm just floats not connected to the other two. Several spurs come off the two arms but this one seems unconnected to either. Arp had a category for such three-armed spiral so it went on my Arp-like to-do list. The other reason is the very odd small but sharply defined dust cloud that cut right across the gap between the northern arm and the core coming to a point near the core then expanding in a puff beyond the bright core region after disappearing for a bit. While I found many papers on this galaxy not one mentions this odd dust lane.

A few HII regions appear faintly in my image. It is a bit over 70 million light-years distant by both redshift and a single non-redshift estimate. Including the faint plumes to the east and west, it is some 150,000 light-years across. Measuring just the main arms it is about 95,000 light-years across. It was discovered by William Herschel on March 17, 1787. With its somewhat faint surface brightness it didn't make either of the Herschel 400 observing programs nor have I any record of trying to see it visually.

Located this low it is out of the Sloan and many other galaxy survey fields so it was the only galaxy besides 2 2MASS galaxies which, since I was making an annotated image for the two asteroids I included. Unfortunately, the pair of galaxies at the upper right I'd liked to have information on weren't listed as galaxies. The bluer one (upper right face on) was listed as an Ultraviolet source seen by GALEX but not identified further. Also, another pair west and a bit south of the center of NGC 5247 isn't listed at all but NED does show a quasar candidate about halfway between the two where I see nothing but the overlapping galaxy. They give no magnitude nor size. But with an error circle of 5" it's hard to pin down what exactly it is seeing. Apparently not either galaxy. Considering several hundred UvS were seen by GALEX, most of which are stars I didn't try to determine which were galaxies.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME


NGC5247L4X10RGB2X10.JPG


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NGC5247L4X10RGB2X10ID.JPG

NGC5248

NGC 5248 is a spectacular spiral galaxy that doesn't get nearly the attention from amateur imagers as it should. It is located in the very southwest corner of Bootes just over the border from Virgo and is considered a member of one arm of the Virgo Cluster. That means its distance is likely in the 50 to 60 million light-year range. I can't find any consensus in the literature. I'm going to go with the 60 million light-year figure as it is a good average for the cluster. Even though the average of all non-redshift measurements at NED are only 50 million light-years with the newest estimates at only 40 million. Assuming the 60 million light-year distance it is some 170,000 light-years in diameter when the very faint outer arms are included. Some but not all classifications consider these outer arms a pseudo-ring giving its classification as (R)SB(rs)bc. It also has a Seyfert 2 core with HII emission. This comes from a ring of star-forming clouds 12" in diameter around the core. Seeing was fair for my image but I only picked up this ring as a mottling around the outer edge of the round core. High-resolution images from the HST show the core has its own spiral structure, sort of a spiral within a spiral. https://upload.wikimedia.org/wikipedia/commons/f/f1/Ngc5248-hst-R814G547B336.jpg Oddly, even with all this star formation going on one paper calls the galaxy inactive. http://mnras.oxfordjournals.org/content/379/4/1249.full.pdf They also give its distance as 74 million light-years. While the core is quite active the disk appears to have little star formation. Some images show a few HII regions in the main dust lane but they are small. The overall color of the galaxy is much redder than in most spirals. It may be this lack of disk star formation that caused it to be listed as inactive in the paper though it does contrast it to Seyfert 2 galaxies without ever mentioning it too is a Seyfert 2 galaxy.

While all sources call it a slightly barred galaxy I am unable to see any hint of the bar, even in the HST image. Occasionally the bar is seen only at radio frequencies. This might be such a case. It is true the arms come off this 12" diameter ring of star formation rather than the core but I see no bar leading to this ring.

The galaxy was discovered by William Herschel on April 15, 1784. It is in the original Herschel 400 observing program. My notes from that read: "Large, almost round galaxy with a nearly starlike nucleus. Interesting detail is seen in the halo. I can almost see the spiral arms. I must come back to this one on a good night." My notes on conditions read "Thick ground fog". As you likely know I often mention reshooting an image but it rarely happens. Seems I had that same issue back in April of 1985 as I never recorded revisiting it even though I put several exclamation points after that comment. It's a big universe out there with too much to explore for me to find time to go back to the old. That's my excuse anyway.

Large but faint outer arms like seen here are often the sign of interaction with another galaxy. None are in my frame though I didn't check around the area outside the field. More likely lack of star formation in the disk, as well as the active core, are due to something it digested in the past. This can kill star formation except in the dense core giving a galaxy this appearance. But it certainly isn't required that this happened. It may just be natural for this galaxy.

Only one quasar and two asteroids are in the image The field contains a lot of galaxies but few had redshift data leading to a rather sparse annotated image. As with much of my imaging of late, the night went south on me. Color data is highly suspect. One green frame never was taken as it was scheduled last and conditions got so bad that after the first green frame the observatory shut down. I didn't discover the missing green frame until I went to process it. Fortunately green is the least critical color and there was no space junk in the single green frame. Every blue and 3 luminance frames had at least one piece of space junk, some frames had two. With no space junk, I managed to make the one green frame do.

14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME


NGC5248L4X10RB2X10G1X10.JPG


NGC5248L4X10RB2X10G1X10CROP125.JPG


NGC5248L4X10RB2X10G1X10ID.JPG


Ngc5248-hst-R814G547B336.jpg

NGC5252

I made another attempt at a voorwerpjes galaxy. This time NGC 5252 but conditions this night were awful. My sky was 4 times brighter than a previous night when I captured NGC 5972 I posted right after I took it in May. I saw no hint of the structure in the raw images as they came in. But this was because the high background washed it out of the raw images. Once properly calibrated it began to show up. Still, the image is very noisy compared to 5972 and I can't trust some of the green I picked up. It doesn't seem to quite match the HST image location. Though some is out of the HST's limited field of view. ( https://www.spacetelescope.org/images/heic1507f/ Rotated about 90 degrees counterclockwise from my image.) This one needs to be redone but it was too far west by the time I realized this. In fact, it was already too far west when taken, that's why the background was so bright. It was in the light dome of a town of 4000 16 miles to the southwest of my location. Still, some of the structures definitely match. It amazes me what amateur gear can accomplish today. When I started in the mid 50's film couldn't begin to match film at major observatories but digital has helped level the playing field. We just need a lot more time with our smaller scopes.

William Herschel didn't know of voorwerpes when he discovered this one on February 2, 1786. It didn't make either program.

NGC 5252 is listed as an S0 Seyfert galaxy. The Seyfert status, as well as the voorwerpjes around it, are likely due to the galaxy it ate which then fired up the black hole in its center to quasar status. That lit up the voorwerpjes then faded down to only Seyfert status today but the light echo is still propagating our way. Redshift puts the galaxy about 330 million light-years distant. That makes this a huge galaxy of some 230,000 light-years long including the voorwerpjes and 200,000 light-years for the galaxy itself. Looking around the field there are a lot of other galaxies at this same distance. These include CGCG 045-060 an Sc galaxy that itself is about 75,000 light-years across. Most of the others are small dwarf size galaxies. But near the upper left is UGC 0865 a double galaxy. The edge on to the lower right is a distant 1.12 billion light-years distant and thus large at 150,000 light-years. It's apparently larger "companion is an Sbc spiral at about the same redshift as NGC 5252 so likely part of its local group. It is half the size of its "smaller" companion at 75,000 light-years. Obviously while the share common catalog entries in several catalogs they are totally unrelated.

The field is in Virgo not far from the border with Bootes. NGC 5252 was yet another William Herschel discovery made on April 11, 1785. It is apparently too faint to have made either Herschel 400 observing program.

14" LX200R @ f/8, L=4x10' RGB=2x10', STL-11000XM, Paramount ME


NGC5252L4X10RGB2X10.JPG


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NGC5256

NGC 5256/Mrk 266 is a pair of colliding and merging galaxies. Their stars have been thrown about all over the place creating a field of plumes around the two cores of what were likely spiral galaxies prior to the collision. The mess stretches over at least 220 million light-years in my image assuming a distance of 350 million light-years. It is classified as simply peculiar by NED. The southwest galaxy is listed as being a Seyfert 2 galaxy while the other is LINER. The entire mess is listed as a starburst galaxy as well as a Luminous InfraRed Galaxy. The NGC project, however, classes it as Sab/Pec. Redshift puts the galactic mess at 390 million light-years, but the HST has shown it to be more likely 350 million light-years distant. It is located in the southeast corner of Ursa Major only 1.75 degrees northwest of the far more famous interacting pair of galaxies known as M51. The object was discovered by William Herschel on May 12, 1787. It is too small and faint to appear in either of the Herschel 400 observing programs. For more on it see the HST image and text at: http://www.spacetelescope.org/images/heic0810bn/ It is a false-color image made from a blue filter near the Ultraviolet band and a near IR image so the colors won't match mine. For a lot more on this galaxy see: https://www.noao.edu/meetings/bbh/files/2012NovTucson_Mrk266_Mazz.pdf Coverage of NGC 5256 starts about page 16.

What is interesting is that there is a second pair of interacting galaxies seen through the western plume. It is just a blob in my image but shows rather well in the HST image. I find nothing listed at that position in NED or SIMBAD. The HST page doesn't even mention it either.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME


NGC5256L4X10RGB2X10.JPG


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NGC5280

NGC 5275 and NGC 5280 are located in a rich galaxy field in Canes Venatici about 1.5 degrees north of the far more famous M3. While the 5 largest galaxies constitute the WBL 464 galaxy group I couldn't determine exactly what cluster the vast majority of these belong to. There appear to be three main groups, one about 500 million light-years, another at 600 million light-years and a third at 850 million light-years. There's lots of overlap here. The most distant group are likely members of the ABELL 7181 galaxy cluster listed at 830 million light-years. It is a very large but sparse cluster with a center about a minute beyond the left border about midline.

The reason I imaged the field was NGC 5275, also known as VV 543E, An E or maybe S0 galaxy that's quite compact so of rather high mass. It has an apparent companion, VV 543W, a blue spiral that's somewhat distorted with a detached blue star cloud at its south end. This makes the illusion that is it highly warped into a curve around NGC 5275. However, it is an illusion. While it appears distorted it isn't warped after all. The Sloan Survey image clearly shows the arms that appear drawn toward NGC 5275 and the detached piece. My seeing was too poor to show this very clearly. So are they interacting? I found nothing in the literature on this pair addressing this. Redshift puts them about 70 million light-years apart. If correct they are members of two different groups and thus not interacting. Could the difference be due to a high-speed difference between the two? I find this unlikely as such a big speed difference would mean they were within interaction range for far too short of a time to create this distortion.

The NGC galaxies were all discovered by Édouard Stephan. He found NGC 5274 and NGC 5275 on May 25, 1881. The other two were found on May 23, 1881.

UGC 8682 to the northeast of NGC 5275 has a warped southeast end. At 500 million light-years it is another 70 million light-years closer than NGC 5275 so again it is doubtful NGC 5275 had anything to do with its distortion. But it is the same distance as NGC 5280. They could have interacted in the past. Unfortunately, I found nothing on these two either. The field is very poorly researched from what I could determine.

The annotated image lists all galaxies NED had redshift data on as well as a couple quasars. The quasar to the northeast was listed twice with a position difference of only 0.02" of arc and with a slightly different redshift. This is why it is listed with two z values. When converted to light travel time those values were the same within the three digit accuracy I use so only one light travel distance is shown.

If the galaxy had an entry in a common catalog it is listed by that catalog name, otherwise, just a G is used. Why some bright galaxies were missed by LEDA or others but but such catalogs picked up much smaller and fainter galaxies that were very close in position to each other I can't fathom.

I've included the Sloan image as transparency was so poor the night I took this I couldn't go nearly as deep as I would normally go, so a lot was lost.

14" LX200R @ f/10, L=4x10' RGB=2x10' STL-11000XM, Paramount ME

Related Designations for NGC5280

NGC 5280, CGCG 161-131, CGCG 1340.6+3007, MCG +05-32-072, GIN 311, 2MASX J13425552+2952070, 2MASXi J1342555+295207, 2MASS J13425553+2952070, SDSS J134255.53+295206.9, GALEXASC J134255.57+295207.9 , WBL 464-005, CAN 338 NED01, USGC U558 NED04, MAPS-NGP O_324_0273394, NGP9 F324-0273394, NPM1G +30.0309, NSA 143797, PGC 048580, UZC J134255.6+295207, [CBW93] J12 B, NGC 5274, CGCG 161-125, CGCG 1340.1+3006, MCG +05-32-066, GIN 314, 2MASX J13422333+2950523, 2MASS J13422331+2950522, SDSS J134223.31+295052.1, SDSS J134223.31+295052.2, SDSS J134223.32+295052.1, GALEXASC J134223.21+295050.2 , WBL 464-002, CAN 038 NED03, USGC U558 NED08, ASK 513637.0, MAPS-NGP O_324_0272773, MAPS-NGP O_324_0304271, NGP9 F324-0272773, NSA 089593, PGC 048536, UZC J134223.3+295051, [CBW93] J12 E, [TTL2012] 529626, [DZ2015] 725-01, NGC 5275, VV 543, VV 543E, CGCG 161-124, CGCG 1340.1+3005, MCG +05-32-067, GIN 315, 2MASX J13422356+2949293, 2MASS J13422357+2949295, SDSS J134223.55+294929.5, WBL 464-001, CAN 038 NED04, USGC U558 NED07, MAPS-NGP O_324_0304281, NGP9 F324-0304281, NSA 143788, PGC 048544, UZC J134223.6+294929, FIRST J134223.4+294929, [CBW93] J12 F, NGC 5277, KUG 1340+302, CGCG 161-129, CGCG 1340.4+3013, 2MASX J13423840+2957154, 2MASXi J1342383+295716, 2MASS J13423839+2957156, SDSS J134238.38+295715.9, IRAS F13403+3012, WBL 464-003, USGC U558 NED05, NGP9 F324-0273064, PGC 048563, UZC J134238.4+295716, UGC 08682, MCG +05-32-070, 2MFGC 11061, 2MASX J13423701+2951164, 2MASS J13423705+2951168, SDSS J134237.03+295116.3, SDSS J134237.03+295116.4, GALEXASC J134236.79+295114.0 , ASK 526808.0, HOLM 536A, MAPS-NGP O_324_0273045, NGP9 F324-0273045, NSA 092075, PGC 048566, SDSS-g-eon-0675, SDSS-i-eon-0704, SDSS-r-box-0175, SDSS-r-eon-0695, [TTL2012] 119478, NGC5280, NGC5274, NGC5275, NGC5277, UGC08682,


NGC5280L6X10RGB2X10.JPG


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NGC5297

Yet another interesting, apparently connected, galaxy pair amateurs ignore. NGC 5296 and NGC 5297 are a pair of interacting galaxies that Arp was well aware of yet, for some reason, didn't include in his atlas. I'll get to the Arp connection in a bit. This interacting pair is located in northeastern Canes Venatici at a distance of about 110 to 120 million light-years. Though one non-redshift measurement of NGC 5297 puts it nearly a billion light-years away I think we can safely consider that an anomalous result. The pair is sometimes likened to M31 and NGC 205 (M110). NGC 5297 is a large SAB(s)c spiral about 170,000 light-years across thanks to its wide but sparse arms. NGC 5297 was discovered by William Herschel on April 9, 1787 but its companion had to wait until George Stoney working for the Earl of Rosse found it on May 3, 1850. NGC 5297 isn't in either Herschel 400 list but maybe it should be.

NGC 5296 is an S0+: starburst galaxy. It has a very odd blue "secondary nucleus" to use one paper's term to the southeast of the main core. To me, it appears to be a large blue star cluster. Seeing was very poor for this image. I'd hoped to bring it out but seeing merged it with the core so it shows only as a blob on the side of the core. While listed as a dwarf its two tidal plumes give it a diameter of at least 45,000 light-years the main galaxy without the plumes is a large dwarf at 19,000 light-years.

Arp had a strange idea that he spent most of his life trying to prove but few subscribed to it. His idea was quasars were not the black hole centers of distant galaxies chowing down on stars, gas and dust to create their extreme brightness that is general consensus but instead are unknown objects ejected from active galaxies such as these. Their high redshifts weren't due to cosmological expansion but something else that required new physics. I won't claim to understand his claims. Some of this is covered in the Kanipe-Webb book "Arp's Atlas of Peculiar Galaxies" published by Willmann-Bell. Note the quasar to the southwest of NGC 5297, NGC 5296 BSO1. He reported a luminous extension from NGC 5236 pointed at the quasar. If you use the northern edge of the plume it sort of does run to the quasar but the center of it certainly doesn't. To Arp, this fits his theory. What he made of the other quasars in the field I don't know. In any case since space is at least 3 dimensional just because in two dimensions the quasar sort of lines up with the plume doesn't mean it does so in three dimensions. Indeed its redshift argues strongly against this. Until the other quasars in the field and just outside it can be tied in it doesn't mean much. Then there are the thousands of quasars found nowhere near (by angular separation) an active galaxy that his idea requires.

Conditions were poor for this image. A lot of detail was lost. It might actually get reshot in the future if better conditions prevail. But then don't hold your breath. I have a ton of others I want to get.

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME


NGC5297L4X10RGB2X10.JPG


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NGC5300

NGC 5300 is a rather low surface brightness, slightly barred spiral in Virgo about 67 million light-years from us by redshift and 75 million light-years by the median of Tully-Fisher measurements. NED classifies it as SAB(r)c spiral. Its structure consists mostly of arm segments rather than a classic grand design spiral. The segments contain many bright blue star clusters. It has no companions in my frame with all the other galaxies being much more distant so it sits rather lonely in a constellation normally thought of as jam-packed with galaxies. It was discovered by William Herschel on February 2, 1786 but isn't in either of the two Herschel observing programs. Assuming the distance is 67 million light-years its diameter is about 74,000 light-years. A respectable size for a spiral galaxy.

I wish seeing had been better. Weather is just not cooperating this fall and winter. Conditions went south on me during this one and I missed one red and one green. A few days later I managed to get the red frame but the weather never did allow a second green. The one had no satellites which made it reasonable to proceed to process it anyway.

Even though this field isn't all that far from the ecliptic I only picked up one very faint asteroid on the very eastern edge of my field. It was moving nearly due north in prograde motion. I apparently caught it as it was moving from retrograde motion as we passed it to normal prograde motion. While the Minor Planet Center puts its magnitude at 18.9 it appears far fainter than that. I know the night wasn't all that transparent and seeing poor but it is more like 20th magnitude in the image. In fact, I almost missed it. Normally when imaging this close to the ecliptic I pick up quite a few asteroids so catching only one is rare.

Objects labeled CQ are candidate quasars (to a radio amateur like myself CQ has an entirely different meaning which confuses my brain something awful) that NED seems to feel will turn out to be quasars as that is how they were labeled in the page of all galaxies in the image. But when you look it up its listed as a candidate. They also list some as stars on the first page but as candidate quasars on the individual page. A "p" after the redshift look back time means it was determined photographically. It's possible for a star to have a color cut off that mimics that of a distant quasar and thus fool a photographic redshift. This is one reason they are still listed as candidates.

14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME


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NGC5331

This was another opportunity to catch two objects on my to-do list in one field. Maybe my desire to catch two objects is why I took them on such a poor night. This field is in central Virgo but doesn't contain any known members of the famous Virgo Cluster which is some 60 million light-years distant but all galaxies with known redshift in this image are over 200 million distant.

NGC 5331 is actually two galaxies both nearly a half billion light-years distant that are obviously interacting as there are some huge plumes created by their interaction. Unfortunately, this was taken on some very bad nights for transparency (what's new about that this month of May?) so the plumes don't show very well. The one north of the northern member is especially faint. I need to revisit this field on a better night. I measure the northern member, ignoring any plume at about 73,000 light-years across. I didn't include the plume to the north as it was just too faint for a good measurement. The southern member has an extended plume off both ends but especially the northwestern end. I measure its size with the plume, to the extent I see it under these conditions, at 218,000 light-years with the main part 82,000 light-years in size. On a night I'm not losing 2 magnitudes too high clouds (my cloud sensor said it was cloudy so I overrode it to keep imaging, maybe not a good idea) I'm sure both would measure larger. NED simply calls them spirals. The NGC Project says Sbc. That appears to be for both which doesn't make much sense. Seligman doesn't have anything on these two at all. The pair was discovered by William Herschel on May 13, 1793. As he gave it one entry I doubt he realized he was seeing two objects. Of course, the concept of galaxies never existed in his time so this isn't surprising.

My other target of interest is a pair of possibly interacting galaxies to the northeast, UGC 08787 and CGCG 045-130. Both are seen rather edge on. UGC 8787 makes the 2-micron flat galaxy catalog as it appears to have no central bulge. NED classifies it as Sbc: sp LLIRG. LLRG stands for Lower Luminosity InfraRed Galaxy (L<=sun^10.5) LIRG is Luminous Infrared Galaxy (L>sun^10.5<=sun^11) and ULIRG is Ultra Luminous Infrared Galaxy (L>sun^11<=sun^12 but what's over Sun^12 I don't know). This is measured in IR, not visual wavelengths. It has faint extensions off both ends that likely are larger than what I can show under these conditions. I find nothing on it to indicate if these are due to CGCG 045-130 that has virtually the same redshift. Both lie about 210 million light-years away. CGCG 045-130 seems to be either two galaxies or one with an off-center core. Oddly NED shows that Sloan sees a 21st magnitude star at the position of this blue blob at the southeast end of the galaxy. I'm going to assume it is just a star cloud in the galaxy. NED classifies it as Sc(f). The (f) means it is seen edge-on. I can't tell for sure but to me, it looks tilted 10 to 15 degrees away from edge-on. Is the blue object at the southeast end the result of interaction with UGC 08787? Again I found nothing on this.

At the top of the image is NGC 5329 and elliptical galaxy some 340 million light-years distant by redshift, 360 by a pair of Tully-Fisher measurements that disagree by a rather wide margin but average to 360 million light-years. I went with the redshift value and measured it at 234,000 light-years in diameter. Considering how bad the night was I suspect this underestimates its true size. It was discovered by William Herschel on April 30, 1789, four years before he found NGC 5331. Neither of these made either of the Herschel 400 observing programs.

There were several asteroids that normally would be seen in my image. Two are right at my limit and should have been easy. Two were too faint to find and should have been detected better than the two faint ones were. One was quite bright in the lower left of the image. Normally you'd see color trails but I took the color data a night earlier under even worse conditions so that asteroid wasn't in the image frame that night. Details on these are in the annotated image. The night color was taken had horrible seeing of about 7" when blue was taken 4 seconds for red. This causes some color issues. Green was between at 5 to 6 second seeing but only one frame was usable.

The annotated image had to omit about 30 objects that I'd have normally annotated. They just didn't make it through the clouds.

14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME


NGC5331L4X10RB2X10G1X10R-ID.JPG


NGC5331L4X10RB2X10G1X10R.JPG