Celestial Atlas
PGC 11500 - 11999 ←PGC Objects: PGC 12000 - 12499 Link for sharing this page on Facebook→ PGC 12500 - 12999
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Page last updated July 6, 2021

PGC 12126
A magnitude 15(?) lenticular galaxy (type SA0?) in
Perseus (RA 03 15 57.7, Dec +41 12 57)
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 5545 km/sec (and H0 = 70 km/sec/Mpc), PGC 12126 is about 255 to 260 million light-years away, placing it in the Perseus Cluster, one of the richest and most massive clusters of galaxies in the Known Universe. Given that and its apparent size of about 0.45 by 0.4 arcmin (from the images below), the galaxy is about 30 to 35 thousand light-years across. (Since the artifacts created by the star to the galaxy's north are impossible to separate from the image of the galaxy itself, the apparent and actual sizes must be viewed as being more uncertain than usual, but the value shown here is in the middle of a wide range of other estimates, and is probably closer to being correct than not.)
 Since this galaxy and its southeastern "neighbor" IC 308 are both members of the Perseus Cluster, it is possible that the difference of nearly 600 km/sec in their recessional velocities (IC 308 has a CMB recessional velocity of about 6130 km/sec) is a "peculiar velocity" (a random motion relative to neighboring galaxies not related to the Universal Expansion), and they are close enough to be considered "companions". However, it is more likely that PGC 12126 is closer to the near side of the Perseus Cluster and IC 308 is closer to the far side, and they are only companions in the sense of both being members of the same cluster of galaxies.
SDSS image of region near lenticular galaxy PGC 12126, also showing IC 308
Above, a 12 arcmin wide SDSS image centered on PGC 12126, also showing IC 308
Below, a 1 arcmin wide SDSS image of the galaxy; the star "attached" at its north is about magnitude 12.5
SDSS image of lenticular galaxy PGC 12126

PGC 12397
(= PGC 2184272 = UGC 2665 = CGCG 540-100 = MCG +07-07-060)

A magnitude 15(?) spiral galaxy (type SAB(rs)bc? pec) in
Perseus (RA 03 19 27.4, Dec +41 38 07)
Physical Information: Based on a recessional velocity relative to the Cosmic Background Radiation of 7595 km/sec (and H0 = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 12397 is about 350 to 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 340 to 345 million light-years away at the time the light by which we see it was emitted, about 345 to 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 0.9 by 0.4 arcmin (from the images below), the galaxy is about 90 thousand light-years across.
 PGC 12397 is a member of the Perseus Cluster, one of the richest and most massive cluster of galaxies in the Known Universe, so wide-field images are filled with galaxies, which is why I have chosen to have two (less and more thoroughly labeled) wide-field images below.
SDSS image of region near spiral galaxy PGC 12397, also showing a large number of other galaxies in the Perseus Cluster
Above, a 12 arcmin wide SDSS image centered on PGC 12397, also PGC 12417
Below, the same image, also showing NGC 1273, 1274, 1277 and 1278, IC 1907 and numerous PGC galaxies
SDSS image of region near spiral galaxy PGC 12397, also showing labels for a large number of other galaxies in the Perseus Cluster
Below, a 3 arcmin wide SDSS image of PGC 12397 and PGC 12417
SDSS image of spiral galaxy PGC 12397, also known as UGC 1665, PGC 12417, also known as 2MASX J03193743+4137580
Below, a 3 arcmin wide HST image of the same region (Image Credit ESA/Hubble & NASA, W. Harris; Acknowledgement L. Shatz)
HST image of spiral galaxy PGC 12397, also known as UGC 2665, also showing PGC 12417, also known as 2MASX J03193743+4137580
Below, a 1.2 by 1.5 arcmin wide HST image of PGC 12397 (Image Credit as above)
HST image of spiral galaxy PGC 12397, also known as UGC 2665
Below, a 0.9 by 1.2 arcmin wide HST image of the galaxy (North on the right to allow for more detail) (Image Credit as above)
HST image of spiral galaxy PGC 12397, also known as UGC 2665, with north on the right to allow for more detail

PGC 12417
A magnitude 15.5(?) lenticular galaxy (type S0?) in
Perseus (RA 03 19 37.4, Dec +41 37 58)
Physical Information: Based on a recessional velocity relative to the Cosmic Background Radiation of 8425 km/sec (and H0 = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 12417 is about 390 to 395 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 380 million light-years away at the time the light by which we see it was emitted, about 385 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 0.65 by 0.25 arcmin (from the images below), the galaxy is about 65 to 70 thousand light-years across.
 PGC 12417 is a member of the Perseus Cluster, one of the richest and most massive cluster of galaxies in the Known Universe, so wide-field images are filled with galaxies, which is why I have chosen to have two (less and more thoroughly labeled) wide-field images below.
SDSS image of region near PGC 12417, also showing a large number of other galaxies in the Perseus Cluster
Above, a 12 arcmin wide SDSS image centered on PGC 12417, also showing PGC 12397
Below, the same image, also showing NGC 1273, 1274, 1277, 1278 and 1281, IC 1907 and numerous PGC galaxies
SDSS image of region near spiral galaxy PGC 12417, also showing labels for a large number of other galaxies in the Perseus Cluster
Below, a 3 arcmin wide SDSS image of PGC 12397 and PGC 12417
SDSS image of PGC 12397, also known as UGC 1665, and lenticular galaxy PGC 12417, also known as 2MASX J03193743+4137580
Below, a 3 arcmin wide HST image of the same region (Image Credit ESA/Hubble & NASA, W. Harris; Acknowledgement L. Shatz)
HST image of PGC 12397, also known as UGC 2665, and lenticular galaxy PGC 12417, also known as 2MASX J03193743+4137580
Below, a 0.6 by 0.9 arcmin wide HST image of PGC 12417 (Image Credit as above)
HST image of lenticular galaxy PGC 12417, also known as 2MASX J03193743+4137580
Celestial Atlas
PGC 11500 - 11999 ←PGC Objects: PGC 12000 - 12499→ PGC 12500 - 12999