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HD 194953
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Delphinus
Right ascension	20h 28m 16.7824s
Declination	+02° 56′ 14.0305″
Apparent magnitude (V)	6.19±0.01
Characteristics
Spectral type	G8 III/IV
U−B color index	+0.56
B−V color index	+0.90
Astrometry
Radial velocity (Rv)	−28±0.4 km/s
Proper motion (μ)	RA: +50.801 mas/yr ; Dec.: −5.249 mas/yr
Parallax (π)	7.8706 ± 0.1437 mas
Distance	414 ± 8 ly ; (127 ± 2 pc)
Absolute magnitude (MV)	+0.74
Details
Mass	2.38 M☉
Radius	10.22 R☉
Luminosity	53.7 L☉
Surface gravity (log g)	2.88 cgs
Temperature	5,101±122 K
Metallicity [Fe/H]	−0.11 dex
Rotational velocity (v sin i)	2.4±1.2 km/s
Age	640 Myr
Other designations
	6 G. Delphini, AG+02°2586, BD+02°4175, GC 28470, HD 194953, HIP 100969, HR 7824, SAO 125843
Database references
SIMBAD	data

HD 194953 (HR 7824) is a solitary star in the equatorial constellation Delphinus. It is faintly visible to the naked eye with an apparent magnitude of 6.19^[2] and is located 414 light years away.^[1] However, it is approaching the Solar System with a heliocentric radial velocity of −28 km/s.^[5]

HD 194953 has a stellar classification of G8 III/IV^[3] — a blended luminosity class of a subgiant and giant. It has 2.38 times the mass of the Sun^[7] and an enlarged radius of 10.2 R_☉^[8] at an age of 640 million years.^[7] It radiates at 54 times the luminosity of the Sun^[9] from its photosphere at an effective temperature of 5,101 K,^[8] giving a yellow hue. HD 194953 is slightly metal deficient with an iron abundance 78% that of the Sun^[10] and spins leisurely with a projected rotational velocity of about 2.4 km/s.^[11]

References

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
^ ^a ^b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
^ ^a ^b Cousins, A. W. J. (16 November 1964). "Photometric Data for Stars in the Equatorial Zone (Seventh List)". Monthly Notes of the Astronomical Society of South Africa. 23: 175. Bibcode:1964MNSSA..23..175C. ISSN 0024-8266.
^ ^a ^b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
^ ^a ^b ^c ^d Bertelli, G.; Bressan, A.; Chiosi, C.; Fagotto, F.; Nasi, E. (August 1994). "Theoretical isochrones from models with new radiative opacities". Astronomy and Astrophysics Supplement Series. 106: 275–302. Bibcode:1994A&AS..106..275B. ISSN 0365-0138.
^ ^a ^b ^c ^d Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
^ ^a ^b Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN 1538-3881. ISSN 0004-6256. S2CID 118505114.
^ ^a ^b ^c Liu, Y. J.; Tan, K. F.; Wang, L.; Zhao, G.; Sato, Bun'ei; Takeda, Y.; Li, H. N. (31 March 2014). "The Lithium Abundances of a Large Sample of Red Giants". The Astrophysical Journal. 785 (2): 94. arXiv:1404.1687. Bibcode:2014ApJ...785...94L. doi:10.1088/0004-637X/785/2/94. eISSN 1538-4357. ISSN 0004-637X.
^ ^a ^b de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. ISSN 0365-0138.
^ "HR 7824". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 21, 2022.
^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.