Astronomy:HD 194953
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Short description: High proper motion star
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: −5.249[1] mas/yr |
| Parallax (π) | 7.8706 ± 0.1437[1] mas |
| Distance | 414 ± 8 ly (127 ± 2 pc) |
| Absolute magnitude (MV) | +0.74[6] |
| Details | |
| Mass | 2.38[7] M☉ |
| Radius | 10.22[8] R☉ |
| Luminosity | 53.7[9] L☉ |
| Surface gravity (log g) | 2.88[10] cgs |
| Temperature | 5,101±122[8] K |
| Metallicity [Fe/H] | −0.11[10] dex |
| Rotational velocity (v sin i) | 2.4±1.2[11] km/s |
| Age | 640[7] Myr |
| Other designations | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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. ISSN 0024-8266. Bibcode: 1964MNSSA..23..175C.
- ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 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. ISSN 0365-0138. Bibcode: 1994A&AS..106..275B.
- ↑ 8.0 8.1 8.2 8.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 9.0 9.1 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. Bibcode: 2015AJ....150...88L.
- ↑ 10.0 10.1 10.2 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. doi:10.1088/0004-637X/785/2/94. ISSN 0004-637X. Bibcode: 2014ApJ...785...94L.
- ↑ 11.0 11.1 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. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D.
- ↑ "HR 7824". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+7824.
- ↑ 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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