Observing the Shakhbazian Compact Groups of Galaxies

Shkh 98 - Shkh 322


Shakhbazian 98 (Shkh 98, SHK 98)

1.  anonymous -  08h 52m 08s; +53 36' 49" - mag > 16
2.  anonymous -  08h 52m 13s; +53 36' 20" - mag > 16
3.  anonymous -  08h 52m 11s; +53 36' 05" - mag > 16
4.  anonymous -  08h 52m 09s; +53 36' 09" - mag > 16.5

DSS 8'

Shkh 98, once again in Ursa Maior, is somehow more spectacular on the POSS prints. The image field is dominated by a bright foreground galaxy, NGC 2675 (mag 13.3). This conspicuous oval shaped object marks the NW edge of a gently curved chain of eight star-like galaxies, almost 4 arcminutes long. However, at least the four brightest members of Shkh 98 close to the east of NGC 2675 could be glimpsed visually in the 18-inch, all appearing as 16th magnitude "stars". Unfortunately the southernmost end of this incomparably extragalactic chain consists of galaxies below detection threshold (mag > 17). 


Shakhbazian 154 (Shkh 154, SHK 154)

1.  anonymous -  11h 22m 54s; +01 06' 52" - mag < 16
2.  anonymous -  11h 22m 51s; +01 06' 48" - mag < 16

DSS 5'

At first glance, Shkh 154 in Leo resembles a poor open star cluster, however most member galaxies are extremely faint. Observation with the 18-inch was made under fairly good sky (fst mag 6.2), perhaps better conditions could lead to more details. Only two galaxies were seen, both as faint stars, still discernable at moderate magnifications.


Shakhbazian 166 (Shkh 166, SHK 166, UGC 10638, Abell 2247)

 1. MCG+14-8-17 -  16h 52m 48s; +81 37' 54" - mag 14.9
 2.  MCG+14-8-15 -  16h 50m 58s; +81 34' 25" - mag 15.3
 3.  MCG+14-8-16 -  16h 51m 46s; +81 35' 26" - mag 15.3
 4.  anonymous    -  16h 52m 13s; +81 37' 09" - mag 15.4
 5.  PGC 59120     -  16h 51m 07s; +81 34' 54" - mag 15.9
 6.  PGC 59122     -  16h 50m 55s; +81 33' 57" - mag 16.5
 7.  MCG+14-8-18 -  16h 53m 17s; +81 38' 48" - mag 15.4
 8.  PGC 59227     -  16h 53m 51s; +81 38' 21" - mag 16.6
 9.  PGC 59226     -  16h 53m 42s; +81 38' 06" - mag > 16
10. anonymous     -  16h 51m 54s; +81 35' 23" - mag 17.0

 

DSS 10'

N457/1850; 205

This SCGG is a almost linear chain consisting of 11 compact galaxies scattered on a 15 15 arcminutes field. Additional designation of Shkh 166 is UGC 10638 (GSC; RC3), but actually Shkh 166 is identical with the central core of galaxy cluster Abell 2247 (distance class 3; magnitude of tenth-brightest galaxy: 15.3).

Viewed with the 18 inch telescope, ten of eleven galaxies turned out visible. The brightest and apparently largest member MCG+14-8-17 is evident even in a 14 inch scope under good sky conditions. It appears as a round nebula, slowly brighter to the middle. The second brightest MCG+14-8-16 is somewhat smaller, however it could be glimpsed easily because of its higher surface brightness. A faint companion (10) close to the east was also visible in the 18-inch, although it should be the most challenging member of Shkh 166. However this 17th magnitude object was not that difficult due to its stellar shape. MCG+14-8-15 is very similar to MCG+14-8-16, but less conspicuous.

Further galaxies observed with the 18-inch: PGC 59120 and PGC 59226, both faint and nearly stellar in shape. Unlike this another couple of PGC galaxies was merely discernably at the limits of atmospheric and instrumental resolution. A second anonymous galaxy appearing as a very compact and faint speck is located close to a 13th magnitude star.


Shakhbazian 202 (Shkh 202, SHK 202)

1.  CGCG 158-74 -  12h 19m 54s; +28 23' 09" - mag 14.8
2.  CGCG 158-78 -  12h 20m 10s; +28 23' 20" - mag 15.4
3.  CGCG 158-75 -  12h 19m 51s; +28 25' 21" - mag 15.0
4. CGCG 158-65 -  12h 15m 38s; +28 29' 43" - mag 15.7
5. anonymous   -  12h 20m 02s; +28 31' 30" - mag 15.3
6.  anonymous   - 12h 19m 48s; +28 24' 20" - mag 15.6

DSS 8'

The loose group Shkh 202 in Coma Berenices also contains some of the brightest individual galaxies in the Shakhbazian lists, located in a bridge-like distribution of galaxies which combines the rich galaxy clusters Abell 1656 (Com) and Abell 1367 (Leo). The galaxies in this region form an enormous supercluster. Shkh 202 has been subject to detailed study.

The brightest galaxy CGCG 158-75 (circle) was seen at once in the 18-inch, however its observation is hampered by the presence of the 6.7th magnitude star SAO 82246. Despite being out of the DSS image field, its bright glare is still visible at the top. Luckily all five group galaxies are of very high surface brightness, thus they should be evident on condition that SAO 82246 is kept out of the eyepiece field.


Shakhbazian 317 (Shkh 317, SHK 317)

1.  MCG-1-6-64 - 02h 10m 53s; -06 33' 33" - mag 15.2
2.  MCG-1-6-62 -  02h 10m 41s; -06 34' 47" - mag 15.7
3.  MCG-1-6-61 -  02h 10m 53s; -06 35' 05" - mag 16
4. MCG-1-6-60 -  02h 10m 36s; -06 36' 01" - mag 17
5. MCG-1-6-59 -  02h 10m 35s; -06 36' 23" - mag 17
6.  MCG-1-6-58 - 02h 10m 33s; -06 36' 59" - mag 15.3

DSS 8'

With a declination of -6 35' the galaxy chain Shkh 317 in Cetus is the southernmost of the Shakhbazian groups yet observed. Therefore tracking down was not quite easy, although the member galaxies mostly appear pretty bright on the DSS image. The most conspicuous galaxy MCG-1-6-64 is definetly non-stellar with somewhat diffuse surroundings. Viewed with the 18-inch three members were visible.


Shakhbazian 322 (Shkh 322, SHK 322)

11h 23m 41s; -04 13' 03" - mag > 16

DSS 8' 8'

Shkh 322 in Leo is associated with the faint galaxy cluster Abell 1248. The brightest member galaxy (circle) is also the only object visible. Its appearance in the 18-inch is compact, however not stellar. Averted vision was needed. A faint anonymous galaxy (spiral arms are evident on the DSS image!) is situated in the same field, although not associated with the compact galaxy group. NED reports a magnitude of 15.8 for this object. Visually it turned out very similar to the spotted Shkh 322 galaxy. 


 

Back