Celestial Atlas
PGC 50000 - 50499 ←     PGC Objects: PGC 50500 - 50999 Link for sharing this page on Facebook     → PGC 51000 - 51499
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Page last updated Feb 5, 2016

PGC 50640 (=
HCG 71C)
A 15.5(?) spiral galaxy (type SB(rs)c?) in Bo÷tes (RA 14 11 05.1, Dec +25 28 58)
Apparent size 0.55 by 0.35 arcmin. Vr 8830 km/sec.
Labeled SDSS image of NGC 5008, IC 4382, PGC 50640 and PGC 50641, which comprise Hickson Compact Group 71
Above, a 4.8 arcmin wide labeled SDSS image of Hickson Compact Group 71
Below, a 0.6 arcmin wide SDSS image of PGC 50640
SDSS image of spiral galaxy PGC 50640, also known as Hickson Compact Group 71C

PGC 50641 (=
HCG 71D)
A magnitude 16.5(?) lenticular galaxy (type E/S0?) in Bo÷tes (RA 14 11 08.3, Dec +25 27 28)
Apparent size 0.4 by 0.25 arcmin. Vr 20340 km/sec (z= 0.067843) (HCG 71d is actually much farther away than the other galaxies in HCG 71, so it is not actually a physical member of the Group.)
Labeled SDSS image of NGC 5008, IC 4382, PGC 50640 and PGC 50641, which comprise Hickson Compact Group 71
Above, a 4.8 arcmin wide labeled SDSS image of Hickson Compact Group 71
Below, a 0.6 arcmin wide SDSS image of PGC 50641
SDSS image of lenticular galaxy PGC 50641, also known as Hickson Compact Group 71D

PGC 50984
A magnitude 15.5(?) spiral galaxy (type Sbc?) in
Bo÷tes (RA 14 16 26.0, Dec +39 39 04)
Physical Information: Based on a recessional velocity of 7610 km/sec, a straightforward calculation indicates that PGC 50984 is about 355 million light years away. However, for objects at such distances we should take into account the expansion of the Universe during the time it took their light to reach us. Doing that shows that the galaxy was about 345 million light years away at the time the light by which we see it was emitted, nearly 350 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of about 0.8 by 0.35 arcmin, the galaxy is about 80 thousand light years across.
SDSS image of region near spiral galaxy PGC 50984, also showing NGC 5541
Above, a 12 arcmin wide SDSS image of PGC 50984, also showing NGC 5541
Below, a 1 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy PGC 50984
Celestial Atlas
PGC 50000 - 50499 ←     PGC Objects: PGC 50500 - 50999     → PGC 51000 - 51499