HD 194612
| Observation data EpochJ2000.0EquinoxJ2000.0(ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 20h38m18.6064s[1] |
| Declination | −81° 17′ 20.6261″[1] |
| Apparent magnitude(V) | 5.89±0.01[2] |
| Characteristics | |
| Evolutionary stage | RGB[3] |
| Spectral type | K5 III[4] |
| U−Bcolor index | +2.02[5] |
| B−Vcolor index | +1.71[5] |
| Astrometry | |
| Radial velocity(Rv) | 0.3±0.4[6]km/s |
| Proper motion(μ) | RA:+1.597mas/yr[1] Dec.:−37.819mas/yr[1] |
| Parallax(π) | 4.3006 ± 0.0707mas[1] |
| Distance | 760 ± 10ly (233 ± 4pc) |
| Absolute magnitude(MV) | −0.56[7] |
| Details | |
| Mass | 2.1[8]M☉ |
| Radius | 59.9[9]R☉ |
| Luminosity | 598±13[10]L☉ |
| Surface gravity(logg) | 0.99±0.02[3]cgs |
| Temperature | 3941±122[9]K |
| Rotational velocity(vsini) | 2.3±1.2[11]km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 194612(HR 7812) is a solitary[14]orange hued star located in the southerncircumpolar constellationOctans.It has anapparent magnitudeof 5.9,[2]making it visible to thenaked eyeunder ideal conditions.Parallaxmeasurements place it at a distance of 760light years[1]and it has a low heliocentricradial velocityof0.3km/s.[6]
This is ared giantwith astellar classificationof K5 III,[4]andGaia DR3stellar evolutionmodels place it on thered giant branch.[3]It has double themass of the Sun[8]and an enlargedradiusof59.9R☉[9]due to its evolved status. It shines with aluminosityof598L☉[10]from itsphotosphereat aneffective temperatureof3,941K.[9]Like many giants, HD 194612 has a comparatively modestprojected rotational velocity,which is around2.3km/s.[11]
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.
- ^abcVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData Release 3. Summary of the content and survey properties ".Astronomy and Astrophysics.674:A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
- ^abHouk, N.; Cowley, A. P. (1975).University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°.Bibcode:1975mcts.book.....H.
- ^abJohnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars".Communications of the Lunar and Planetary Laboratory.4:99–110.Bibcode:1966CoLPL...4...99J.
- ^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.eISSN1562-6873.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.eISSN1562-6873.ISSN1063-7737.S2CID119257644.
- ^abKervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022)."Stellar and substellar companions fromGaiaEDR3 ".Astronomy & Astrophysics.657:A7.arXiv:2109.10912.Bibcode:2022A&A...657A...7K.doi:10.1051/0004-6361/202142146.eISSN1432-0746.ISSN0004-6361.
- ^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.
- ^abBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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 sourceatVizieR.
- ^abDe Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014)."A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆".Astronomy & Astrophysics.561:A126.arXiv:1312.3474.Bibcode:2014A&A...561A.126D.doi:10.1051/0004-6361/201220762.ISSN0004-6361.
- ^Gould, B. A.,Uranometria Argentina,Reprinted and updated by Pilcher, F, archived fromthe originalon 2012-02-27,retrieved2012-01-06
- ^"HR 7812".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedJuly 28,2022.
- ^Eggleton, P. P.; Tokovinin, A. A. (11 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.eISSN1365-2966.ISSN0035-8711.
