HD 194012
| Observation data EpochJ2000.0EquinoxJ2000.0(ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h22m52.3692s[1] |
| Declination | +14° 33′ 03.9513″[1] |
| Apparent magnitude(V) | 6.15±0.01[2] |
| Characteristics | |
| Spectral type | F7 V[3] |
| U−Bcolor index | −0.07[4] |
| B−Vcolor index | +0.51[4] |
| Astrometry | |
| Radial velocity(Rv) | 4.5±0.2[5]km/s |
| Proper motion(μ) | RA:+78.997mas/yr[1] Dec.:−7.143mas/yr[1] |
| Parallax(π) | 38.4009 ± 0.0233mas[1] |
| Distance | 84.93 ± 0.05ly (26.04 ± 0.02pc) |
| Absolute magnitude(MV) | +4.06[6] |
| Details | |
| Mass | 1.21+0.19 −0.16[7]M☉ |
| Radius | 1.18±0.04[7]R☉ |
| Luminosity | 1.9[8]L☉ |
| Surface gravity(logg) | 4.36[8]cgs |
| Temperature | 6,301±80[9]K |
| Metallicity[Fe/H] | −0.06[8]dex |
| Rotational velocity(vsini) | 5[10]km/s |
| Age | 1.06[11]Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 194012(HR 7793; Gliese 789) is astarin the equatorialconstellationDelphinus.It has anapparent magnitudeof 6.15,[2]making it visible to thenaked eyeunder ideal conditions. The star is relatively close at a distance of only 85light years[1]but is receding with a heliocentricradial velocityof4.5km/s.[5]
HD 194012 has astellar classificationof F7 V,[3]indicating that it is an ordinaryF-type main-sequence star.It has 121% themass of the Sun[7]and is estimated to be abillion yearsold,[11]spinning with aprojected rotational velocityof5km/s.[10]The star's diameter is 118% that of theSun[7]and shines with aluminosityof1.9L☉[8]from itsphotosphereat aneffective temperatureof6,301K,[9]giving a yellow white hue. HD 194012'smetallicityis calculated to be 87% that of the Sun.[8]
A 2010 paper has identified a candidate substellar companion12.78″away along aposition angleof67.9°.[13]HD 194012 has been examined forinfrared excesssuggesting adebris diskbut none was found.[14]
References
[edit]- ^abcdeBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly 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.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
- ^abHøg, 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.ISSN0004-6361.
- ^abGray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (October 2003)."Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I."The Astronomical Journal.126(4): 2048–2059.arXiv:astro-ph/0308182.Bibcode:2003AJ....126.2048G.doi:10.1086/378365.eISSN1538-3881.ISSN0004-6256.
- ^abMarlborough, J. M. (March 1964)."Frequency of ultraviolet excess among late-type dwarfs in the solar neighbourhood".The Astronomical Journal.69:215.Bibcode:1964AJ.....69..215M.doi:10.1086/109258.ISSN0004-6256.
- ^abGontcharov, 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.ISSN1063-7737.S2CID119231169.
- ^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.ISSN1063-7737.S2CID119257644.
- ^abcdStassun, 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.ISSN0004-6256.
- ^abcdeLuck, R. Earle (21 December 2016)."Abundances in the Local Region. II. F, G, and K Dwarfs and Subgiants".The Astronomical Journal.153(1): 21.arXiv:1611.02897.Bibcode:2017AJ....153...21L.doi:10.3847/1538-3881/153/1/21.eISSN1538-3881.
- ^abCasagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011)."New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆".Astronomy & Astrophysics.530:A138.arXiv:1103.4651.Bibcode:2011A&A...530A.138C.doi:10.1051/0004-6361/201016276.ISSN0004-6361.
- ^abKraft, Robert P. (November 1967)."Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars".The Astrophysical Journal.150:551.Bibcode:1967ApJ...150..551K.doi:10.1086/149359.eISSN1538-4357.ISSN0004-637X.
- ^abDemarque, Pierre; Woo, Jong‐Hak; Kim, Yong‐Cheol; Yi, Sukyoung K. (December 2004)."Y 2 Isochrones with an Improved Core Overshoot Treatment".The Astrophysical Journal Supplement Series.155(2): 667–674.arXiv:astro-ph/0409024.Bibcode:2004ApJS..155..667D.doi:10.1086/424966.ISSN1538-4357.
- ^"HD 194012".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedJune 16,2022.
- ^Tanner, Angelle M.; Gelino, Christopher R.; Law, Nicholas M. (October 2010)."A High-Contrast Imaging Survey ofSIM LitePlanet Search Targets ".Publications of the Astronomical Society of the Pacific.122(896): 1195–1206.arXiv:1007.4315.Bibcode:2010PASP..122.1195T.doi:10.1086/656481.eISSN1538-3873.ISSN0004-6280.
- ^Gáspár, András; Rieke, George H.; Ballering, Nicholas (29 July 2016)."The Correlation Between Metallicity and Debris Disk Mass".The Astrophysical Journal.826(2): 171.arXiv:1604.07403.Bibcode:2016ApJ...826..171G.doi:10.3847/0004-637X/826/2/171.eISSN1538-4357.
