NGC 691 Galaxy Group

NGC 691
NGC 691: Galaxy group in Aries; 500 mm Cassegrain f/7.2; SBIG STL11K; 90-30-30-30 min LRGB; Bernese Highlands; © 2011 Radek Chromik

History

The galaxies NGC 678, NGC 680 and NGC 697 were discovered on 15 September 1784 by the German-British astronomer William Herschel with his 18.7 inch reflecting telescope. He did not come across NGC 691 until 13 November 1786. The discovery of NGC 694 by the German astronomer Heinrich d'Arrest did not take place until 2 December 1861. He used an 11 inch refractor telescope. IC 167 was discovered on 4 January 1889 by the French astronomer Guillaume Bigourdan with a 12.4 inch refractor. The tail light of this discovery round is IC 1730 which was discovered on 17 January 1896 by the French astronomer Stephane Javelle with the 76 cm refractor telescope of the Observatoire de Nice. [196, 277]

Physical Properties

These galaxies belong to the NGC 691 galaxy group, which is located approximately at a distance of 27.8 Mpc to 40.9 Mpc from us. Some sources also include NGC 695 in this group, but their distance is about 135 Mpc, which means it is far in the background. [145]

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
NGC 67801 49 24.8+21 59 49Gx (SBb)13.312.24.5 × 0.8pB, S, iR, mbM, p of 2UGC 1280, MCG 4-5-14, CGCG 482-18, A 0147+21
NGC 68001 49 47.3+21 58 16Gx (E1)12.911.91.8 × 1.6pB, S, iR, mbM, f of 2UGC 1286, MCG 4-5-15, CGCG 482-19
NGC 69101 50 41.7+21 45 37Gx (Sbc)12.211.43.4 × 2.5F, cL, vglbMUGC 1305, MCG 4-5-19, CGCG 482-23, CGCG 460-31, IRAS 01479+2130
NGC 69401 50 58.4+21 59 49Gx (S0/P)14.313.70.6 × 0.4F, S, R, bet 2 st 15UGC 1310, MCG 4-5-20, MK 363, IRAS 01481+2144, CGCG 482-24, 5ZW 122
NGC 69701 51 17.5+22 21 27Gx (SBbc)12.812.04 × 1.3F, cL, E, mbMNGC 674, UGC 1317, MCG 4-5-22, CGCG 482-27, IRAS 01485+2206
IC 16701 51 08.5+21 54 45Gx (SBc)13.613.12.7 × 1.8eF, * 10.5 n 4'UGC 1313, MCG 4-5-21, CGCG 482-25, Arp 31, IRAS 01483+2139
IC 173001 49 57.9+22 00 46Gx (S0)15.414.40.8 × 0.5F, S, R, gbMMCG 4-5-15A, CGCG 482-20, NPM1G +21.0080

Finder Chart

The NGC 691 galaxy group can be found in the constellation Aries. The best time to observe is August to February, when it is highest at night.

Chart NGC 691 Galaxy Group
NGC 691 Galaxy Group in constellation Aries. Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

More Objects Nearby (±15°)

References

145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)