Object name: M105

Designation(s): M105, NGC3384, NGC3389,

M105 is a large elliptical galaxy in Leo. It is part of the Leo I group which includes M95 and M96 which is located about 40 million light-years away. M105 is the large spherical (E0) galaxy. It is also known as NGC 3379. To the NE is NGC 3384/3371 (SB0), also a member of the group. It\'s another of those galaxies with two NGC numbers. NGC 3384 better fits its position in the sky so is considered the main designation of the two. Below it is NGC 3389 (SAc) a very blue spiral galaxy. Its redshift puts it at a distance nearly twice as far away as the Leo I group. Thus, it is more likely a member of the nearby Virgo Cluster. The color contrast between a spiral that is currently forming new stars and the reddish hue of elliptical galaxies that haven\'t had much if any star formation for billions of years is quite striking.

Some of the galaxies in the background are part of the Zwicky galaxy cluster 1045.8+1251. It is listed as 45 minutes in diameter (larger than my long diameter of 33 minutes) and to contain 120 galaxies. He listed it as \"medium distant\" the second closest class out of 5. How these distances were determined I don\'t know. Redshift was not used. One paper says his near and medium distant classes are quite accurate when compared to redshift data but the other classes tend to overestimate their distance.

The image contains 4 asteroids. Easiest to find northwest (right) of M105 is (50572) 2000 EM39 at magnitude 17.3 East of NGC 3384 near the left edge of the image is (49344) 1998 WC4 at magnitude 18.8 (seems at least 0.5 magnitudes brighter than the Minor Planet Center estimate). See the annotated image for the other two. The Minor Planet Center is now tracking over 440,000 known asteroids. It\'s no wonder they keep showing up in my images! (Edit: The total is now over 820,000 as I type this in February 2017)

The image also contains galaxies beyond the Zwicky cluster as well as a few quasars. I\'ve included an annotated image pointing these out along with their distance in billions of light years. Galaxies are labeled with a G in front of their distance. Quasars have no label, just their distance. Note one galaxy, nearly 3 billion light-years away, can be seen right through NGC 3384 showing how little dust and gas galaxies of this type have and thus, why star formation ceased long ago.

A photo of this area taken by the 0.9 meter telescope on Kitt Peak is at:

You can read more about M105 at:

I included all 4 luminance frames but one was poor. I debated leaving it out as it reduced resolution but did also reduce noise as well.

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

Alternate Designation(s): 1AXG J104750+1234, 1AXG J104816+1237, 1AXG J104827+1232, 2MASS J10474959+1234539, 2MASS J10481688+1237454, 2MASS J10482789+1231597, 2MASX J10474959+1234538, 2MASX J10481689+1237454, 2MASXi J1047495+123455, 2MASXi J1047496+123455, 2MASXi J1048170+123746, 2MASXi J1048278+123200, ADBS J104829+1232, AKARI J1048286+123158, ASK 379947.0, BMW-HRI J104827.8+123157, CGCG 066-018, CGCG 066-021, CGCG 066-022, CGCG 1045.2+1251, CGCG 1045.7+1254, CGCG 1045.8+1248, CXO J104749.5+123453, CXO J104749.57+123453.8, CXO J104817.0+123746, CXO J104827.9+123200, CXOU J104749.6+123454, CXOU J104816.9+123745, GALEXASC J104749.60+123455.0 , GIN 773, HDCE 0626 NED004, HDCE 0626 NED005, HIPASS J1048+12b, HOLM 212A, HOLM 212B, HOLM 212C, KTG 33A, KTG 33B, KTG 33C, LDCE 0778 NED009, LDCE 0778 NED010, Leo GROUP:[FS90] 025, Leo GROUP:[FS90] 026, Leo GROUP:[FS90] 028, Leo I GROUP:[TT2002] 01, Leo I GROUP:[TT2002] 02, LGG 214:[G93] 004, LGG 217:[G93] 004, LGG 217:[G93] 005, LQAC 162+012 002, M105, MCG +02-28-011, MCG +02-28-012, MCG +02-28-013, MESSIER 105, NGC 3371, NGC 3373, NGC 3379, NGC 3379:[BFK2008] 081, NGC 3379:[DJF2005] 01, NGC 3379:[L2011a] X0010, NGC 3379:[LB2005] X01, NGC 3379:[RW2000] X-01, NGC 3384, NGC 3389, NGC3384, NGC3389, NSA 074625, NSA 158774, NSA 158790, NVSS J104749+123444, NVSS J104827+123158, PGC 032256, PGC 032292, PGC 032306, PRC C-34, RSCG 36:[WBJ2013] A, RSCG 36:[WBJ2013] B, RSCG 36:[WBJ2013] C, SDSS J104816.88+123745.3, SDSS J104827.90+123159.4, SDSS J104827.91+123159.5, SSTSL2 J104749.58+123454.3, SSTSL2 J104816.88+123745.9, UGC 05902, UGC 05911, UGC 05914, USGC U323 NED03, USGC U323 NED05, UZC J104749.6+123453, UZC J104816.9+123747, UZC J104828.0+123159, [AHG2014] B152, [CHP2004] J104749.6+123454, [GCM2012] 32, [GMM2009b] 21, [M98j] 095 NED08, [M98j] 095 NED09, [M98j] 095 NED10, [VPP2013] 07,