Object name: SHK30

Designation(s): SHK30, HCG97, IC5351, IC5352, IC5356, IC5357, IC5359,

SHK 30 also known as HCG 69 is a group of galaxies in southwestern Pisces. In the HGC it consists of 5 galaxies, A through E. In the SHK list those are 1-5 respectively. But it goes on with 6 through 11 and A through D for 15 galaxies. While all of the HCG galaxies and thus the SHK 1-6 galaxies are about 270 million light-years distant that isn't true of some of the other SHK galaxies. C, for instance, is listed at over 3 billion light-years. Others have no redshift data at NED. The most interesting of these is B which is an obviously disrupted galaxy of some sort. In my image, it appears to be two galaxies but high-resolution images show it to be one disrupted galaxy. The star at the southern end makes it appear comet-like further confusing things. I wish I could find something on it but I can't. Its blue color differs greatly from the other members. That may just be due to star formation caused by the disruption.

Another odd galaxy is NSA 152639. Its distance indicates it could be a group member. In my image, it too is somewhat comet-like with a head at the south end. At first, I suspected it and B might have tangled in the past. But high-resolution images of it show it a double galaxy. The NED position points between the two, a bit closer to the eastern member. It is larger and has an off-center core causing the "comet" head. So it may be an interacting pair of dwarf galaxies.

The two PGC galaxies to the southeast have redshifts that indicate they too could be members of the group, just too far removed to make either compact group catalog.

My system imaged this one on a very poor night. So poor it retook one green and both blue frames. Once I saw the data I realized all data from the first night needed to be retaken but by then it was too far west. Why my system accepted such poor data I don't know. When I ran it through the filter all was rejected but it only three color frames were rejected that night, yet it's the same filter. This isn't the first time that's happened but I thought I knew the problem and corrected it. Apparently not. The red data was one third the strength of the retaken blue and green and due to clouds, the stars were much smaller. This made reconstructing the color difficult. Even eXcalibrator couldn't help much. Color is mostly adjusted to what I am guessing it should be. The luminance data too, is very weak and very noisy, falling a good 2 magnitudes short of normal. A lot of fainter features of these galaxies is lost.

All 5 HGC members are in the IC catalog. They were discovered by Edward Barnard sometime in 1889. His records are too incomplete to pin it down further.

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

Related Designation(s):

1RXS J234724.4-021839, 2MASS J23471893-0218488, 2MASS J23471986-0216507, 2MASS J23472299-0218021, 2MASS J23472381-0221043, 2MASS J23473786-0219003, 2MASX J23471891-0218485, 2MASX J23471984-0216505, 2MASX J23472298-0218025, 2MASX J23472378-0221045, 2MASX J23473787-0218598, 2MFGC 17847, 2XMM J234718.9-021848, 2XMM J234722.9-021800, 2XMM J234723.9-022106, 2XMM J234737.8-021900, 2XMMp J234718.9-021848, 2XMMp J234722.9-021800, 2XMMp J234723.8-022106, 2XMMp J234737.7-021900, 6dF J2347379-021900, APMUKS(BJ) B234445.88-023331.2, APMUKS(BJ) B234449.08-023443.6, APMUKS(BJ) B234449.77-023745.2, EON J356.910-02.319, FGC 2535, GALEXASC J234719.89-021651.2 , GALEXASC J234723.03-021803.6 , GALEXASC J234723.80-022103.7 , GALEXASC J234737.83-021859.9 , GALEXMSC J234719.84-021649.8 , GALEXMSC J234723.69-022104.4 , GALEXMSC J234737.76-021858.9 , GSC 5252 00887, GSC 5252 00896, GSC 5252 00904, HCG 097, HCG 097:[dRC97] 03d, HCG 097:[dRC97] 04c, HCG 097:[dRC97] 06, HCG 097:[dRC97] 06b, HCG 097:[dRC97] 09e, HCG 097A, HCG 097B, HCG 097C, HCG 097D, HCG 097E, HCG97, HDCE 1252 NED003, IC 5351, IC 5352, IC 5356, IC 5357, IC 5359, IC5351, IC5352, IC5356, IC5357, IC5359, LDCE 1594 NED004, LDCE 1594 NED005, LDCE 1594 NED006, MCG -01-60-032, MCG -01-60-033, MCG -01-60-034, MCG -01-60-036, MCXC J2347.4-0218, NSA 152637, NSA 152638, NSA 152642, NSA 152643, NSA 152659, PGC 072404, PGC 072405, PGC 072408, PGC 072409, PGC 072430, RASSCALS SS2b 312, RFGC 4189, RSCG 87, RXC J2347.4-0218, SHK 030, SHK 030:[STO93] 01, SHK 030:[STO93] 02, SHK 030:[STO93] 03, SHK 030:[STO93] 04, SHK 030:[STO93] 05, SHK30, SS2b 312, SS2b 312.026, SS2b 312.027, SS2b 312.029, SS2b 312.030, SS2b 312.032, SSTSL2 J234718.92-021848.6, SSTSL2 J234719.85-021650.7, SSTSL2 J234722.99-021802.0, SSTSL2 J234723.80-022104.4, SSTSL2 J234737.85-021900.2, USGC S297, USGC S297 NED03, USGC S297 NED04, USGC S297 NED05, v2MCG 84:[DMP2012] 1, v2MCG 84:[DMP2012] 2, v2MCG 84:[DMP2012] 3, v2MCG 84:[DMP2012] 4, v2MCG 84:[DMP2012] 5, [DZ2015] 524-01, [DZ2015] 524-03, [DZ2015] 524-05, [MFB2005] J234719.90-021650.4 ,