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Upsilon Capricorni

Location of υ Capricorni (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Capricornus
Right ascension	20 40 02.94518
Declination	−18° 08′ 19.1664″
Apparent magnitude (V)	5.17
Characteristics
Spectral type	M1 III
B−V color index	+1.65
Astrometry
Radial velocity (Rv)	−12.3±1.6 km/s
Proper motion (μ)	RA: −23.503 mas/yr Dec.: −22.157 mas/yr
Parallax (π)	4.4702 ± 0.2352 mas
Distance	730 ± 40 ly (220 ± 10 pc)
Absolute magnitude (MV)	−1.09
Details
Radius	76.36+8.05 −14.16 R☉
Luminosity	1,283.0±76.5 L☉
Temperature	3,953+427 −193 K
Metallicity	−0.08 dex
Other designations
υ Cap, 15 Capricorni, NSV 25208, BD−18°5738, FK5 773, HD 196777, HIP 101984, HR 7900, SAO 163779
Database references
SIMBAD	data

Upsilon Capricorni, Latinized from υ Capricorni, is a solitary star in the southern constellation of Capricornus. It has a reddish hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.17. The star is about 730 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −12 km/s. It is 0.22 degree north of the ecliptic, so is subject to lunar occultations.

This is an aging red giant star on the asymptotic giant branch with a stellar classification of M1 III, a star that has exhausted the supply of hydrogen at its core then cooled and expanded. At present it has 76 times the radius of the Sun. It is a suspected variable star of unknown type with a brightness that has been measured ranging from a peak of 5.19 down to 5.24. The star is radiating 1,283 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,953 K.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ Barnes, T. G.; et al. (May 1978), "Stellar angular diameters and visual surface brightness. III - an improved definition of the relationship", Monthly Notices of the Royal Astronomical Society, 183 (3): 285–304, Bibcode:1978MNRAS.183..285B, doi:10.1093/mnras/183.3.285.
3. ^ Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Bibcode:1988mcts.book.....H.
4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
6. "* ups Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-05-12.
7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
8. White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal, 94: 751, Bibcode:1987AJ.....94..751W, doi:10.1086/114513.
9. Dunham, D. W.; Evans, D. S.; Silverberg, E. C.; Wiant, J. R. (March 1973), "The angular diameter of Upsilon Capricorni and an occultation of SAO 118655.", Astronomical Journal, 78: 199–201, Bibcode:1973AJ.....78..199D, doi:10.1086/111398.
10. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
11. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.

v t e Constellation of Capricornus
Capricornus in Chinese astronomy List of stars in Capricornus
Stars	Bayer α (Prima Giedi) α (Algedi) β (Dabih) β γ (Nashira) δ (Deneb Algedi) ε ζ η θ ι κ λ μ ν (Alshat) ξ ξ ο ο π ρ σ τ τ υ φ χ ψ ω Flamsteed 3 4 17 19 20 21 24 (A) 27 29 30 31 33 35 36 (b) 37 41 42 44 45 46 (c) 47 (c) 50 Variable R HR 7722 7845 7898 HD 197027 202206 204313 Other HATS-3 LP 816-60
Exoplanets HD 192310 b c HD 202206 c HD 204313 b HD 202772 Ab PSO J318.5−22
Star clusters Messier 30 Palomar 12
Galaxies	NGC 6907 7016 7019 7030 7035 7035A 7073 Other IC 1337 PKS 2126-158
Galaxy clusters HCG 87
Category

• M-type giants
• Bayer objects
• Capricornus
• Durchmusterung objects
• Flamsteed objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects