The original Principal Galaxies Catalog contained 73,197 entries. Subsequent revisions have increased this to more than three million entries. I have no intention of covering all of those entries on this site, but there needs to be a place to list or discuss (if needed) any PGC entries referred to elsewhere, so this page (or if it grows too large some group of pages based on this page) will eventually list all such entries with PGC designations of 1,000,000 to 1,999,999.

Note About Designation: NED does not recognize the LEDA designation for PGC 1028361; instead, it lists this galaxy as 2MASXi J0017313-064845.
Physical Information: The apparent size of PGC 1028361 is about 0.3 by 0.2 arcmin (from the images below), but its distance is unknown, so its actual size is also unknown. For the same reason, whether it is a physical companion of NGC 64 or merely an optical double is also unknown.

Designation Note: Since this object has a PGC designation well beyond the scope of the original Principle Galaxy Catalog, a search for PGC 1039683 in the NED fails to return a result. However, a search for LEDA 1039683 will retrieve the page for this object.
Physical Information: Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 16080 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 1039683 is about 745 to 750 million light years away, well beyond a single redshift-independent distance estimate of about 395 million light years (though the paper discussed in the HST press release puts the distance at about 800 to 805 million light years, more in line with the Hubble Flow distance). 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 700 to 705 million light years away at the time the light by which we see it was emitted, about 720 to 725 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 0.22 by 0.19 arcmin, the galaxy is about 45 thousand light years across.
 The HST image of this galaxy is available not because of any particular interest in PGC 1039683, but because the dot inside the circle to the south southeast of the galaxy is the first identifiable object thought to have a medium-sized black hole inside it (that is, one that is much more massive than stellar-mass black holes, but much less massive than the supermassive black holes in the centers of large galaxies). The paper mentioned in the HST press release states that the dot is a large cluster of stars orbiting PGC 1039683 (suggesting that some of the other dots in the HST image of the galaxy are also globular clusters), and the medium-sized black hole inside the cluster has an estimated mass of about 50 thousand Solar masses.

Physical Information: This "bright cluster galaxy" is acting as a gravitational lens, producing mirror images (above and below the foreground galaxy) of a far more distant spiral galaxy (SGAS J143845.1+145407, discussed in the following paragraph). The PGC galaxy has a recessional velocity relative to the Cosmic Microwave Background radiation of 71345 km/sec; using H₀ = 70 km/sec/Mpc and relativistic calculations that take into account the expansion of the Universe during the time it took the galaxy's light to reach us, it was about 2550 million light-years distant at the time the light by which we now see it left it, about 2835 to 2840 million years ago (the difference between the values being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of about 0.5 by 0.2 arcmin for the main gaxlaxy and about 0.8 by 0.2 arcmin including the extensions to the east and particularly toward the west (from the images below), PGC 1470080 is about 370 thousand light-years across and its faint extensions span nearly 600 thousand light-years.
Classification Note: The lensing galaxy (PGC 1470080) used to be described as an elliptical galaxy, but the exceptionally clear HST image shown below shows that it is a peculiar lenticular galaxy. Corwin suggested the classification shown above, regretfully noting that "(l)", which indicates a bright lens-shaped central structure, is an unfortunate wording, since the galaxy itself is called a "lensing" galaxy and the spiral images near it are of a "lensed" galaxy; but there are only so many words that can be used to describe things, and in this case, "lens" happens to be used in three different ways. The colon at the end of the description indicates that there might be other ways to describe the galaxy, and the classification is in at least some way uncertain.
SGAS J143845.1+145407: This is a gravitationally lensed spiral galaxy, seen in the HST image as a pair of mirror-images centered on the foreground galaxy that is acting as a lens (the nearly linear structure that lies in front of PGC 1470080 and appears to connect the mirror images is a third image of the spiral, and is the kind of nearly-noodle-shaped image usually seen for lensed galaxies). Based on a recessional velocity relative to the Cosmic Microwave Background radiation of 244630 km/sec, and taking into account the relativistic calculations required for an object with such a very large recessional velocity, SGAS J143845.1+145407 was about 5165 to 5170 million light-years away at the time that the light by which we now see it left it, about 7010 years ago (the difference betwen the two numbers being due to the expansion of the intervening space during the light-travel time). The lensed image is exceptionally clear (usually such images are more or less circular smears that give no impression of the appearance of the original galaxy) and Corwin suggests that the spiral is of type SB(rs)b pec, although to what extent it is "peculiar", and to what extent it merely appears that way because of the effects of the gravitational lensing is of course uncertain. How the lensing action of a nearby galaxy affects the apparent size of a more distant galaxy is probably unknowable, so the apparent size of the spiral may not have anything to do with its actual size; but given its appearance, it may be comparable in size to our own Milky Way galaxy.
"Apparently Interacting Companion" J143842.6+145357: The southeastern of the two galaxies to the southwest of PGC 1470080 appears to be interacting with it. It has no designation that responds to a database search, but can be identified by its position as J(2000)143842.6+145357. Per SIMBAD, it has a recessional velocity relative to the Cosmic Microwave Background radiation of about 71145 km/sec, which is nearly the same as the value for PGC 1470080, so it appears that the two galaxies are indeed physical and interacting companions. Given its presumed distance (also about 2550 million light-years at the time that the light by which we see it left it) and its apparent size of about 0.3 by 0.15 arcmin (counting its fainter extended outline, as shown in the images below), it is about 220 to 225 thousand light-years across.
J143842.5+145403: Just to the north of J143842.6+145357 is a peculiar spiral galaxy which appears to be interacting with its southern neighbor. Unfortunately, no recessional velocity appears to be available for this object, but if it is interacting with J143842.6+145357 and was also about 2550 million light-years away at the time the light by which we see it left it, then its 0.15 by 0.08 arcmin apparent size (again, from the images below) would correspond to about 110 thousand light-years.

Based on recessional velocity of 13350 km/sec, about 600 million light years away. Given that and apparent size of 0.45 by 0.45 arcmin, about 80 thousand light years across. PGC 1053379, 9113 (and presumably 9107), 1054270 and 3080366 all have similar recessional velocities (and presumably, distances). As a result, they may be a gravitationally bound group.

Based on recessional velocity of 13175 km/sec, about 590 million light years away. Given that and apparent size of 0.65 by 0.15 arcmin, about 110 thousand light years across. PGC 1054270, 9113 (and presumably 9107), 1053379 and 3080366 all have similar recessional velocities (and presumably, distances). As a result, they may be a gravitationally bound group.

Based on recessional velocity of 23430 km/sec, about 1 billion light years away. Given that and apparent size of 0.25 by 0.15 arcmins, about 75 thousand light years in diameter.

Physical Information: Sometimes suggested as a possible companion of NGC 2877, but more than twice as distant, so they are merely an optical double. Vr 17190 km/sec, z 0.057347.

Note About Designation: A search of NED for PGC 1341667 returns no result; that database lists it as 2MASX J00072729+0812213.
Physical Information: Based on a recessional velocity of 25315 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 1341667 is about 1175 to 1180 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 1065 to 1070 million light years away at the time the light by which we see it was emitted, about 1110 to 1115 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 0.25 by 0.15 arcmin (from the images below), the galaxy is about 75 to 80 thousand light years across.

Note About Designation: A search of NED for PGC 1342413 returns no result; that database lists it as 2MASX J00074110+0814053.
Physical Information: Based on a recessional velocity of 10580 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 1342413 is about 490 to 495 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 470 to 475 million light years away at the time the light by which we see it was emitted, about 480 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 0.45 by 0.25 arcmin (from the images below), the galaxy is about 60 to 65 thousand light years across.

Note About Designation: A search of NED for PGC 1431761 returns no result. That database lists it as 2MASXJ13542913+1328068. (In the Hubble press release, it is only referred to as SDSS J1354+1328, but that is so "rough" a designation that it would be impossible to find it in any other database.)
Physical Information: PGC 1431761 is interacting with PGC 4539513, so the appropriate recessional velocity for determining their Hubble distance is the average of their recessional velocities. For PGC 1431761 that value is 19030 km/sec, and for PGC 4539513 it is 18980 km/sec. Based on their average recessional velocity of 19005 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that the pair is about 885 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 pair was about 820 to 825 million light years away at the time the light by which we see it was emitted (the Hubble press release that the HST image is taken from lists a value of about 800 million light years), about 845 to 850 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 0.23 by 0.1 arcmin, PGC 1431761 is about 55 thousand light years across. The apparent size of about 0.1 by 0.06 arcmin for PGC 4539513 corresponds to about 20 to 25 thousand light years, and the about 0.66 by 0.24 arcmin wide span of the regions ejected into intergalactic space corresponds to about 155 to 160 thousand light years.
 The interaction between the two galaxies is ionizing the green region to the southeast of PGC 4539513, and feeding material into a black hole on that galaxy's northwestern rim. The pink region shown there represents material falling into the black hole, and the purplish region are X-rays recorded by the Chandra X-ray space telescope. The system appears to be unique in that there is evidence for at least two such events (or "burps" of X-ray emission), separated by about 100 thousand years.

Listed in NED as 2MASXJ13163736+1420297. Based on recessional velocity of 57780 km/sec (nearly 20% the speed of light), about 2.6 billion light years away. Given that and apparent size of 0.17 by 0.13 arcmin, about 125 thousand light years across.

Listed in NED as Arp57 NED02. Apparent size 0.25 by 0.2 arcmin; nothing else available. See PGC 46225 for images.

Listed in NED as 2MASXJ13163675+1427287. Based on recessional velocity of 31140 km/sec (about 10% of the speed of light), about 1.4 billion light years away. Given that and apparent size of 0.35 by 0.15 arcmin, about 130 thousand light years across.

Listed in NED as SDSSJ131638.55+142958.7. Based on recessional velocity of 17995 km/sec), about 800 million light years away. Given that and apparent size of 0.2 by 0.15 arcmin, about 50 thousand light years across.

Listed in NED as 2MASXJ13163200+1433327. Based on recessional velocity of 19765 km/sec, about 880 million light years away. Given that and apparent size of 0.25 by 0.25 arcmin, about 60 thousand light years across.

Listed in NED as 2MASXJ13164943+1438429. Based on recessional velocity of 49800 km/sec (more than 15% of the speed of light), about 2.2 billion light years away. Given that and apparent size of 0.25 by 0.15 arcmin, about 160 thousand light years across.

Listed in NED as SDSS J000846.00+155142.2. Based on recessional velocity of 12125 km/sec, about 540 million light years away. Given that and apparent size of 0.32 by 0.21 arcmins, about 50 thousand light years in diameter.

Listed in NED as 2MASX J00090205+1554338. Based on recessional velocity of 20895 km/sec, about 930 million light years away. Given that and apparent size of 0.39 by 0.23 arcmins, about 100 thousand light years in diameter.

Note About Designation: NED does not recognize the LEDA designation for this object; instead, it uses the designation SDSS J000907.76+155504.3.
Physical Information: Based on a recessional velocity of 16870 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PGC 1496365 is about 785 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 735 million light years away at the time the light by which we see it was emitted, about 755 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 0.35 by 0.25 arcmin (from the images below, including its northwestern extension), the galaxy is about 75 thousand light years across.

Note About Designation: NED does not recognize the LEDA designation for this object; instead, it uses the designation 2MASXJ00143728+1834231.
Physical Information: PGC 1563523 has an apparent size of about 0.35 by 0.3 arcmin (from the images below); but nothing is known about its distance or its actual size.

Physical Information: Based on a recessional velocity of 7355 km/sec, a straightforward calculation indicates that PGC 1591421 is between 340 and 345 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 between 330 and 335 million light years away at the time the light by which we see it was emitted, between 335 and 340 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 0.35 by 0.35 arcmin, the galaxy is about 35 thousand light years across.
 Since PGC 1591421's recessional velocity is only 260 km/sec less than that of NGC 3040, it is possible that instead of being the best part of 10 to 15 million light years apart the two galaxies might be a physical pair; but unlike the certainly incorrect pairing of NGC 3040 with PGC 200252, no one seems to have given any thought to the possibility that PGC 1591421 might be involved with the NGC object.

Note About Designation: NED does not recognize the LEDA designation of PGC 1667882; instead, it lists this galaxy as 2MASXJ00211007+2219401.
Physical Information: Based on a recessional velocity of 6035 km/sec (and H₀ = 70 km/sec/Mpc), PGC 1667882 is about 280 million light years away. Given that and an apparent size of about 0.3 by 0.2 arcmin (from the images below), it is about 25 thousand light years across.

Note About Designation: NED does not recognize the LEDA designation of PGC 1668790; instead, it lists this galaxy as 2MASX J00210826+2222400.
Physical Information: Based on a recessional velocity of 5710 km/sec (and H₀ = 70 km/sec/Mpc), PGC 1668790 is about 265 million light years away. Given that and an apparent size of about 0.3 by 0.08 arcmin (from the images below), it is about 20 to 25 thousand light years across.

Note About Designation: NED does not recognize the LEDA designation of PGC 1669768 for this galaxy; instead, it uses 2MASXJ00220205+2225531.
Physical Information: Based on a recessional velocity of 21425 km/sec (and H₀ = 70 km/sec/Mpc), a straightforward calculation indicates that PG 1669768 is about 995 to 1000 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 915 to 920 million light years away at the time the light by which we see it was emitted, about 950 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 0.45 by 0.15 arcmin (from the images below), the galaxy is about 120 thousand light years across.

Note About Designation: NED recognizes the LEDA designation of PGC 1670567.
Physical Information: Based on a recessional velocity of 5855 km/sec (and H₀ = 70 km/sec/Mpc), PGC 1670567 is about 270 to 275 million light years away. Given that and its apparent size of about 0.5 by 0.35 arcmin (from the images below), it is about 40 thousand light years across. Barring a very large peculiar (non-Hubble expansion) velocity relative to NGC 94, the two galaxies are probably companions, and perhaps a gravitationally bound pair.

Arp's Atlas of Peculiar Galaxies does not always make it clear which object is the one shown for a given Arp listing. One unfortunate result of this is that most references show different entries, or even no entry at all for Arp 60 (Examples: A Wikimedia listing of Arp objects simply identifies it as "Arp 60". A Wikisky search for Arp 60 shows an essentially empty field about 2 arcmin south of the correct position. A LEDA search for Arp 60 yields PGC 46036, which is about 3 arcmin northwest of the correct position.) Fortunately, the correct object (PGC 1762846, as shown above) does lie within the general area of the incorrect listings, and an NED search for Arp 60 shows the correct object (though unfortunately, with an image so poor that it is hard to accept it as an example of a spiral galaxy with a small high surface brightness companion, which is a requirement for Arp listings in this numerical range; it also doesn't help that the only NED entry that allows a comparison with the LEDA database is the object's 2MASS position). Still, as the top two images below show, the field of view for that galaxy is the same as the one in Arp's catalog, so the identification above is certain.
    Based on a recessional velocity of 21520 km/sec, a straightforward calculation indicates that PGC 1762846 is just over 1000 million light years away. However, for objects at such distances we should take the expansion of the Universe during the time it took their light to reach us into account. Doing that shows that the galaxy was about 920 million light years away at the time the light by which we see it was emitted, about 955 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 0.35 by 0.35 arcmin, the galaxy is about 95 thousand light years across.

Nothing known save for its apparent size of 0.16 by 0.07. If at the same distance as PGC 1762846 (which see for images), about 40 thousand light years across; but in the absence of further evidence, the two galaxies may be merely an optical double.

Vr 22825 km/sec (z = 0.076135), apparent size 0.4 by 0.15 arcmin. In close proximity to IC 3614, which see for images.

Part of Abell 2634, the Pegasus II cluster of galaxies. Based on recessional velocity of 10370 km/sec, about 460 million light years away. Given that and apparent size of 0.6 by 0.4 arcmins, about 80 thousand light years in diameter. See PGC 85597 for a closeup of PGC 1801452, and PGC 72000 for a wide-field view of the region around these galaxies.

NED lists as 2MASXJ00084122+2744128. Apparent size 0.25 by 0.17 arcmins; nothing else available.

Note About Designation: NED does not recognize the LEDA designation for PGC 1883375; instead, it lists this galaxy as 2MASXJ00192910+2955337.
Physical Information: PGC 1883375 has an apparent size of about 0.25 by 0.15 arcmin (from the images below), but its distance is unknown, so its actual size is also unknown.