Hi Glen & All,
A quick fumble through the SIMBAD database on IC 1484 provides a B magnitude of +15.5. The rule of thumb for converting that to an approximate true V magnitude is to add 0.9 magnitudes, so it would seem V mag ~14.6 is about right. Given its diminutive (0.2 x 0.2') size, I'd think a +40cm telescope could see it under a genuine dark sky.
http://simbad.u-strasbg.fr/simbad/si...bmit=submit+id
It appears to be in a group with NGC 7639 (IC 1485) (+7,951km/s) and NGC 7638 (IC 1483) (+7,990km/s) (so these two are about 360 mly distant) but the recessional velocities indicate IC 1484 (+13,104) is somewhat in the background to the other two (about 600mly distant). There are a few other much fainter galaxies with either KUG or IRAS designations quite nearby and maybe physically associated with the two in the foreground.
Haven't observed any of them myself.
Steve Gottlieb's NGC observing notes contain visual descriptions for the two NGC galaxies and IC 1484 with his 45cm telescope:
NGC 7638 = IC 1483 = MCG +02-59-030 = CGCG 431-046 = PGC 71246
23 22 33.1 +11 19 44
V = 14.4; Size 0.6'x0.5'; Surf Br = 13.1
17.5" (9/7/96): very faint, small, round, 30" diameter, low even surface brightness. Located 8' N of mag 8.3 SAO 108572. A wide pair of mag 11/13 stars is 1.5' S. First in faint group with IC 1484 and IC 1485 = NGC 7639 (uncertain ID). IC 1484 is extremely faint and small, round.
Andrew Ainslie Common discovered NGC 7638, along with NGC 7639 and 7630, on or before 8 Aug 1880 while viewing comet Faye. Common only mentions "there are 2 similar nebulae [to NGC 7630] within 30' sf" but does not provide coordinates for NGC 7638 and 7639. A group of faint galaxies is ~20' ESE of NGC 7630. It's likely that common picked up the two brightest, NGC 7638 = CGCG 431-046 and NGC 7639 = CGCG 431-050.
Stephane Javelle independently discovered these galaxies on 2 Dec 1893 and measured accurate positions. So, NGC 7638 = IC 1483 and NGC 7639 = IC 1485. MCG and CGCG label these galaxies using the IC designation only. See Harold Corwin's NGC/IC notes.
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NGC 7639 = MCG +02-59-032 = CGCG 431-050 = IC 1485 = PGC 71256
23 22 48.2 +11 22 22
V = 14.6; Size 0.6'x0.5'; PA = 123d
17.5" (9/7/96): very faint, small, round, 30" diameter. Similar size as IC 1483 = NGC 7638 but contains a very small brighter core that makes it a little easier to view. Just preceding a small triangle of mag 12-14.5 stars. Also collinear with a wide pair 5' SW near IC 1483. Brightest in a trio with IC 1484 2.1' WNW and IC 1483 4.5' SW.
The identification of IC 1483 is certain but NGC 7639 is uncertain.
Andrew Ainslie Common discovered NGC 7639, along with NGC 7638, on 8 Aug 1880 while viewing comet Faye. This is the last entry in his discovery list. See notes for NGC 7630 and 7638.
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and IC 1484:
IC 1484 = LEDA 1392792
23 22 39.9 +11 23 04; Peg
V = 15.1; Size 0.6'x0.3'; PA = 49°
17.5" (9/7/96): extremely faint and small, round. Faintest in trio with IC 1483 and IC 1485 and requires averted vision and GSC finder chart to glimpse occasionally. Located 2.1' WNW of brighter IC 1485.
Stephane Javelle discovered IC 1484 = J. 1-799, along with IC 1483 and 1485, on 2 Dec 1893. The latter two galaxies are probably identical to Andrew Ainslie Common's NGC 7638 and NGC 7639, discovered earlier in 1880. Common mentions two galaxies within 30' SE of NGC 7630 (#32 on his list). MCG incorrectly identifies MCG +02-59-032 as IC 1484, although MCG +02-59-032 = IC 1485.
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As you can see Steve Gottlieb provides a V mag of 15.1 for IC 1484, I'm not sure where that info is from.
Looking at the SDSS image (and the DSS) of NGC 7638 (IC 1483) shows it to be a somewhat disrupted rather asymmetric barred spiral galaxy. There is another small galaxy (KUG 2320+110B) 1.6 arcmins N that also looks a bit odd (coma-shaped), so these two might be an interacting pair.
https://www.wikidata.org/wiki/Q11684..._SDSS_DR14.jpg
Best,
L.
