Deep Sky Object in Spring
Copeland's Septet (Galactic group in Leo)
|Date & Time: ||Feb 11 2005, from 26:29 to 26:56 JST(+0900)
|Composed 4 shots with 8 minutes exposed|
|Optical: ||Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
|Auto-guided with Meade LX200 Equatorial & Pictor 201XT
|Digital Camera: ||Fujifilm FinePix S2 Pro
|Location: ||Ooizumi, Hokuto city, Yamanashi pref.
|Camera Settings: ||Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)|
|CCD Sensitivity...ISO1600, White Balance...Auto|
At around the tail of Leo, about 8 degrees NW from Denebola, there is a small-scaled galactic group.
It contains seven major member galaxies with 14 or 15th magnitude, the group is called "Copeland's Septet" because Ralph Copeland discovered the group in 1874.
The group is only 5 arc minutes in span, it's difficult to detect individual galaxies through large-sized telescopes.
The group is one of compact galactic groups distributed in heavens, has a number of 57 of Hickson's compact groups.
The distance is estimated about 480 millions light years.
|3753||57a||11h 37m 53.8s||+21°58' 51"||1.7×0.5'||13.6|
|3746||57b||11h 37m 43.6s||+22°00' 34"||1.1×0.5'||14.2|
|3750||57c||11h 37m 51.8s||+21°58' 26"||0.8×0.7'||13.9|
|3754||57d||11h 37m 55.1s||+21°59' 09"||0.4×0.3'||14.3|
|3748||57e||11h 37m 49.2s||+22°01' 33"||0.7×0.4'||14.8|
|3751||57f||11h 37m 54.1s||+21°56' 10"||0.8×0.5'||13.9|
|3745||57g||11h 37m 44.6s||+22°01' 15"||0.4×0.2'||15.2|
||Member galaxies of Copeland's Septet