NGC 7771 Galaxy Group

NGC 7769, NGC 7770, NGC 7771
NGC 7769, NGC 7770, NGC 7771: Galaxy group in Pegasus; 500 mm Cassegrain f/7.2; SBIG STL11K; 120-20-20-20 min LRGB; Bernese Highlands; © 2011 Radek Chromik [32]

History

The three galaxies were discovered on 18 September 1784 by the German-British astronomer William Herschel with his 18.7 inch reflecting telescope. He cataloged them as II 230 (NGC 7769) and II 231 (NGC 7770 and NGC 7771). Herschels class II stood for faint nebulae. [277, 463]

Physical Properties

The galaxies are in gravitational interaction with each other. NGC 7771 is undergoing a massive star formation spurt, which may have been caused by the dwarf galaxy NGC 7770. This appears to be in the early stages of a merger with NGC 7771. The resulting tidal disturbances may have caused the apparent two-armed spiral pattern and forced a significant portion of the disk gas inward. [438] Distances range from 58 Mpc to 63 Mpc (189 to 205 million light years) [145]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Name RA Dec Type bMag vMag B-V SB Dim PA z D(z) MD Dreyer Description Identification, Remarks
NGC 7769 23 51 04.1 +20 09 02 Gx (Sb) 12.8 12.0 0.8 14.2 3.2 × 2.7 170 0.014046 59.33 pF, pS, R, mbM WH II 230; h 2274; GC 5020; UGC 12808; MCG 3-60-30; CGCG 455-54; IRAS 23485+1952; KCPG 592A; KAZ 346; KUG 2348+198A
NGC 7770 23 51 22.5 +20 05 49 Gx (S0-a) 14.4 13.8 0.6 13.1 0.7 × 0.4 17 0.013733 58.01 vF, vS, iR, s of 2 GC 5021; UGC 12813; MCG 3-60-34; CGCG 455-57; KUG 2348+198B; KAZ 347; NPM1G +19.0594
NGC 7771 23 51 24.6 +20 06 44 Gx (SBa) 13.1 12.3 0.8 13.1 2.4 × 1.1 68 0.014267 60.26 45.450 pB, pL, E 84°, bM, n of 2 WH II 231; h 2275; GC 5022; UGC 12815; MCG 3-60-35; CGCG 455-58; IRAS 23488+1949; KCPG 592B; KAZ 348; KUG 2348+198C

Finder Chart

The NGC 7771 galaxy group is located in the constellation Pegasus. The best observation time is June to December, when it is highest at night.

Finder Chart NGC 7771 Galaxy Group
NGC 7771 Galaxy Group in constellation Pegasus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Objects Within a Radius of 15°

References