Celestial Atlas
PGC 52000 - 52499 ←     PGC Objects: PGC 52500 - 52999 Link for sharing this page on Facebook     → PGC 53000 - 53499
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Page last updated Dec 14, 2015

PGC 52500

PGC 52501

PGC 52502

PGC 52503

PGC 52504

PGC 52505

PGC 52506

PGC 52507

PGC 52508

PGC 52509

PGC 52698 (with
PGC 214322 = Arp 64)
A 15th-magnitude spiral galaxy (type Sb) in Bo÷tes (RA 14 45 26.4, Dec +19 27 57)

A distorted spiral galaxy, with an 18th-magnitude bright knot 2s of time west of center (at RA 14 45 22.6, Dec +19 27 58), about 0.1 by 0.1 arcmin in size (listed in NED as Arp 64 NED01). The visible-light recessional velocity of the main galaxy is 12510 km/sec; a second value at radio wavelengths is only 9395 km/sec, and may come from a fainter object lying somewhat closer, or to a high-speed jet of radio-emitting matter that happens to be heading more or less in our direction. Either way, the visible-light recessional velocity seems the appropriate one to use for Hubble distance estimates. A straightforward calculation then indicates that the galaxy is about 580 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that PGC 52698 was about 555 million light years away at the time the light by which we see it was emitted, about 565 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 1.5 by 0.4 arcmin, the galaxy is about 240 thousand light years across, and the small blob at its western end is about 15 thousand light years in size.

SDSS image of spiral galaxy PGC 52698 and PGC 214322, which comprise Arp 64
Above, a 2.4 arcmin wide closeup of PGC 52698 and PGC 214322
Below, a 12 arcmin wide region centered on the pair
SDSS image of region near spiral galaxy PGC 52698 and PGC 214322, which comprise Arp 64
Below, the same region, showing labels for PGC Objects
PGC 52675, 214323, 1590568, 1591189, 1592430, 1592846 and 1595320
SDSS image of region near spiral galaxy PGC 52698 and PGC 214322, which comprise Arp 64; also shown are PGC 52675, 214323, 1590568, 1591189, 1592430, 1592846 and 1595320

PGC 214322 (with
PGC 52698 = Arp 64)
Listed here since its association with PGC 52698 is the basis for Arp 64
A 17th-magnitude galaxy (type unknown) in Bo÷tes (RA 14 45 27.1, Dec +19 28 31)

Apparent size 0.3 by 0.1 arcmin; nothing else really known, but if actually associated with PGC 52698 (which see for images), then its distance of about 555 million light years would make PGC 214322 almost 50 thousand light years across. Based on its appearance, probably an irregular or loosely structured galaxy.


PGC 52803 (with faint companion to east, =
Arp 47)
A 15th-magnitude spiral galaxy (type SBc?) in Bo÷tes (RA 14 47 14.5, Dec +18 51 31)

Listed as Arp 47, as an example of a spiral galaxy with a faint companion. Based on a recessional velocity of 12350 km/sec, a straightforward calculation indicates that PGC 52803 is about 575 million light years away. However, for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was about 550 million light years away at the time by which we see it was emitted, about 560 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 0.75 by 0.4 arcmin, PC 52803 is about 120 thousand light years across. Its obvious companion (to the west, or to the right in the images below) is PGC 2802352, but since the Arp listing specifies a "faint" companion, that is not the other member of Arp 47; instead, it is the 19th-magnitude object on the eastern (left edge) of PGC 52803 (its designation as SDSS J144715.24+185134.8 being shortened to "J144715.2+185134" in the image).

SDSS image of spiral galaxy PGC 52803, listed with faint companion as Arp 47; also shown is spiral galaxy PGC 2802352, which is not part of Arp 47
Above, a 2.4 arcmin wide closeup of PGC 52803; also shown is PGC 2802352, which is not part of Arp 47
Below, a 12 arcmin wide region centered on the galaxy
SDSS image of region near spiral galaxy PGC 52803, listed with faint companion as Arp 47; also shown is spiral galaxy PGC 2802352, which is not part of Arp 47

PGC 2802352 (not part of
Arp 47)
Temporarily listed here because shown in images of PGC 52830, above
(will be moved to permanent location at a later date)
A 16th-magnitude spiral galaxy (type SB?) in Bo÷tes (RA RA 14 47 12.6, Dec +18 51 33)

Because of its proximity to PGC 52803 (which see for images), often listed as part of Arp 47. However, that classification refers to a spiral galaxy with a faint companion, which means that it is not PGC 2802352 but the small object on the eastern side of PGC 52803 that is the other component of Arp 47. Apparent size 0.6 by 0.4 arcmin. Distance and therefore size unknown.


PGC 52935 (with
PGC 52940 = Arp 261)
A 14th-magnitude peculiar galaxy (type IB(s)m pec) in Libra (RA 14 49 32.9, Dec -10 09 51)

Based on a recessional velocity of 1855 km/sec, PGC 52935 is about 86 million light years away. Given that and its apparent size of 1.7 by 0.85 arcmin, it is about 40 thousand light years across. PGC 52935 is part of an interacting or collisional pair (or perhaps triplet) listed as Arp 261. The interaction between the galaxies has considerably distorted their shapes, and caused spectacular bursts of star formation. The interaction also proves that whatever their distance, both galaxies are at essentially the same distance from us, as they are obviously in direct physical contact.


Above, a closeup of the interacting galaxies (Image Credits: ESO)
Below, a labeled version of the image above

Below, a 12 arcmin wide composite view centered on the object
Composite image of ESO and Wikisky images of the region near Arp 261

PGC 52940 (with
PGC 52935 = Arp 261)
A 13th-magnitude galaxy (type IB(s)m pec) in Libra (RA 14 49 30.6, Dec -10 10 24)

Based on a recessional velocity of 1835 km/sec, PGC 52940 is about 85 million light years away, in reasonable agreement with a redshift-independent distance estimate of 94 million light years. Given that and its apparent size of 3.0 by 2.0 arcmin, it is about 75 thousand light years across. PGC 52940 is part of an interacting or collisional pair with PGC 52935, which see for images, listed as Arp 261. The interaction between the galaxies has considerably distorted their shapes, and caused spectacular bursts of star formation. The interaction also proves that whatever their distance, both galaxies are at essentially the same distance from us, as they are obviously in direct physical contact.

Celestial Atlas
PGC 52000 - 52499 ←     PGC Objects: PGC 52500 - 52999     → PGC 53000 - 53499