HD 172051
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h38m53.40151s[1] |
| Declination | −21° 03′ 06.7415″[1] |
| Apparent magnitude(V) | 5.85[2] |
| Characteristics | |
| Spectral type | G5 V[2] |
| B−Vcolor index | 0.68[3] |
| Astrometry | |
| Radial velocity(Rv) | +37.14±0.20[1]km/s |
| Proper motion(μ) | RA:−75.128±0.163[1]mas/yr Dec.:−153.645±0.150[1]mas/yr |
| Parallax(π) | 76.6355 ± 0.1082mas[1] |
| Distance | 42.56 ± 0.06ly (13.05 ± 0.02pc) |
| Absolute magnitude(MV) | 5.27[4] |
| Details | |
| Mass | 0.865[5]or1.00[6]M☉ |
| Radius | 0.90[5]R☉ |
| Surface gravity(logg) | 4.65[2]cgs |
| Temperature | 5,638[2]K |
| Metallicity[Fe/H] | –0.21[2]dex |
| Rotational velocity(vsini) | 0.32[7]km/s |
| Age | 4.1–4.8[8]Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 172051(86 G. Sagittarii) is a single,[10]yellow-hued star in the southernconstellationofSagittarius.The star is barely bright enough to be seen with the naked eye, having anapparent visual magnitudeof 5.85.[2]Based upon an annualparallax shiftof 76.64mas,it is located some 43light yearsfrom the Sun. It is moving away from the Sun with aradial velocityof +37 km/s.[1]
This ordinaryG-type main-sequence staris considered asolar analog,having physical properties sufficiently similar to the Sun. It has astellar classificationof G5 V[2]and is around 4.5 billion years old. The mass is similar to the Sun, although it is cooler and has a lower luminosity. Due to this similarity, HD 172051 has been selected as an early target star for both theTerrestrial Planet FinderandDarwinmissions, which seek to find an Earth-likeextrasolar planet.[11]During a search forbrown dwarfcompanions using theHale Telescopein 2004, two candidate companions were identified atangular separationsof 5″ and 6″. However, these were determined to be background stars.[12]
References
[edit]- ^abcdefgBrown, 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.
- ^abcdefgMaldonado, J.; et al. (May 2012). "Metallicity of solar-type stars with debris discs and planets".Astronomy & Astrophysics.541:A40.arXiv:1202.5884.Bibcode:2012A&A...541A..40M.doi:10.1051/0004-6361/201218800.S2CID46328823.
- ^Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars",Monthly Notes of the Astronomical Society of Southern Africa,27:11,Bibcode:1968MNSSA..27...11C.
- ^Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics",Astronomy and Astrophysics,501(3): 941–947,arXiv:0811.3982,Bibcode:2009A&A...501..941H,doi:10.1051/0004-6361/200811191,S2CID118577511.
- ^abTakeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog",The Astrophysical Journal Supplement Series,168(2): 297–318,arXiv:astro-ph/0607235,Bibcode:2007ApJS..168..297T,doi:10.1086/509763,S2CID18775378
- ^Zechmeister, M.; et al. (April 2013), "The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars",Astronomy & Astrophysics,552:62,arXiv:1211.7263,Bibcode:2013A&A...552A..78Z,doi:10.1051/0004-6361/201116551,S2CID53694238,A78.
- ^Martínez-Arnáiz, R.; et al. (September 2010)."Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter"(PDF).Astronomy and Astrophysics.520:A79.arXiv:1002.4391.Bibcode:2010A&A...520A..79M.doi:10.1051/0004-6361/200913725.S2CID43455849.Archived fromthe original(PDF)on 2017-09-22.Retrieved2018-11-04.
- ^Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics".The Astrophysical Journal.687(2): 1264–1293.arXiv:0807.1686.Bibcode:2008ApJ...687.1264M.doi:10.1086/591785.S2CID27151456.
- ^"HD 172051".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedNovember 15,2018.
- ^Eggleton, P. P.; Tokovinin, A. A. (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,S2CID14878976.
- ^"Planet hunters target nearby star".BBC News.2003-11-07.Retrieved2006-08-04.
- ^Tanner, Angelle M.; et al. (October 2010), "A High-Contrast Imaging Survey of SIM Lite Planet 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,S2CID118459054.
Sources
[edit]- "HD 172051".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2006-08-04.
- "HD 172051 / HR 6998".SolStation.Retrieved2006-08-04.
