HD 194953

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
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 28m 16.7824s[1]
Declination +02° 56′ 14.0305″[1]
Apparent magnitude (V) 6.19±0.01[2]
Characteristics
Spectral type G8 III/IV[3]
U−B color index +0.56[4]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)−28±0.4[5] km/s
Proper motion (μ) RA: +50.801 mas/yr[1]
Dec.: −5.249 mas/yr[1]
Parallax (π)7.8706 ± 0.1437 mas[1]
Distance414 ± 8 ly
(127 ± 2 pc)
Absolute magnitude (MV)+0.74[6]
Details
Mass2.38[7] M☉
Radius10.22[8] R☉
Luminosity53.7[9] L☉
Surface gravity (log g)2.88[10] cgs
Temperature5,101±122[8] K
Metallicity [Fe/H]−0.11[10] dex
Rotational velocity (v sin i)2.4±1.2[11] km/s
Age640[7] Myr
Other designations
6 G. Delphini, AG+02°2586, BD+02°4175, GC 28470, HD 194953, HIP 100969, HR 7824, SAO 125843[12][13]
Database references
SIMBADdata

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
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. "HR 7824". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 21, 2022.
  13. 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.
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