NGC 681

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NGC 681
NGC 681 legacy dr10.jpg
legacy surveys image of NGC 681
Observation data (J2000 epoch)
Constellation Cetus
Right ascension 01h 49m 10.829s [1]
Declination −10° 25 35.13 [1]
Redshift 0.00587 ± 0.00002 [1]
Heliocentric radial velocity 1760.4 ± 6.6 km/s [1]
Distance ~66.5 million ly (20.39 ± 1.45 Mpc) [1]
Apparent magnitude  (V)12 [2]
Characteristics
Type SAB(s)ab
Mass 1.9×1010 [3]   M
Mass/Light ratio 3.6 [3]   M/L
Size~29.07 kpc (diameter) [1]
Apparent size  (V)2.70 × 1.8 arcmin [2] [4]
Other designations
MCG -02-05-052, PGC 6671 [5]

NGC 681 is an intermediate spiral galaxy in the constellation of Cetus, located approximately 66.5 million light-years from Earth. [1] [2] [4]

Contents

SDSS image of NGC 681 NGC681 - SDSS DR14.jpg
SDSS image of NGC 681

Observation history

NGC 681 was discovered by the German-born British astronomer William Herschel on 28 November 1785 and was later also observed by William's son, John Herschel. [2] John Louis Emil Dreyer, compiler of the first New General Catalogue of Nebulae and Clusters of Stars, described NGC 681 as being a "pretty faint, considerably large, round, small (faint) star 90 arcsec to [the] west" that becomes "gradually a little brighter [in the] middle". [2]

Physical characteristics

NGC 681 shares many structural similarities with the Sombrero Galaxy, M104, although it is smaller, less luminous, and less massive. Its thin, dusty disc is seen almost perfectly edge-on and features a small, very bright nucleus in the center of a very pronounced bulge. [6] Distinctly unlike M104, NGC 681's disc contains many H II regions, where star formation is likely to be occurring. [3] [6] The galaxy has a mass of 1.9×1010 M, a mass-to-light ratio of 3.6 , and a spiral pattern which is asymmetrical. [3]

    See also

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    References

    1. 1 2 3 4 5 6 7 "NGC 681 NASA/IPAC Extragalactic Database Results". ned.ipac.caltech.edu. Retrieved November 2, 2018.
    2. 1 2 3 4 5 "New General Catalog Objects: NGC 650 - 699". cseligman.com. Retrieved November 2, 2018.
    3. 1 2 3 4 Burbridge, E. M.; G.R., Burbridge; Prendergast, K.H. (1965). "Rotation and Mass of the SA Galaxy, NGC 681". Astrophysical Journal. 142: 154–159. Bibcode:1965ApJ...142..154B. doi:10.1086/148270. hdl: 2060/19650010085 .
    4. 1 2 "Revised NGC Data for NGC 681". spider.seds.org. Retrieved November 2, 2018.
    5. "NGC 681". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-02-19.
    6. 1 2 Faber, S. M.; Balick, B.; Gallagher, J. S.; Knapp, G. R. (1977). "The neutral hydrogen content, stellar rotation curve, and mass-to-light ratio of NGC 4594, the "Sombrero" galaxy". The Astrophysical Journal. 214: 383–389. Bibcode:1977ApJ...214..383F. doi:10.1086/155260. ISSN   0004-637X.