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HD 172051 Observation data Epoch J2000      Equinox J2000 Constellation Sagittarius Right ascension 18h 38m 53.40s [1] Declination -21° 03′ 06.7″ [1] Apparent magnitude (V) 5.866 Characteristics Spectral type G5 V U−B color index 0.15 B−V color index 0.65 Variable type None Astrometry Radial velocity (Rv) +35.6 km/s Proper motion (μ) RA: -74.85 ± 0.77 [1] mas/yr Dec.: -152.00 ± 0.47 [1] mas/yr Parallax (π) 76.43 ± 0.47[1] mas Distance 42.7 ± 0.3 ly (13.08 ± 0.08 pc) Absolute magnitude (MV) 5.29 Details Mass 1.0 M☉ Radius 0.86 R☉ Luminosity 0.65 L☉ Temperature 5,580 K Age (4.1–4.8) × 109[2] years Other designations 86 G. Sagittarii, GJ 722, HR 6998, BD -21°5081, GCTP 4289.01, SAO 187086, HIP 91438. HD 172051 (86 G. Sagittarii) is a main sequence dwarf star in the constellation Sagittarius. It is located about 42 light years from the Sun and is considered a solar analog. It is similar in mass 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 the Terrestrial Planet Finder and Darwin missions, which seek to find an Earth-like extrasolar planet.[3] References ^ a b c d e van Leeuwen, F. (2007). "HIP 91438". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=91135. Retrieved 2009-12-12.  ^ 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. Bibcode 2008ApJ...687.1264M. doi:10.1086/591785.  ^ "Planet hunters target nearby star". BBC News. 2003-11-07. http://news.bbc.co.uk/2/hi/science/nature/3237575.stm. Retrieved 2006-08-04.  External links "HD 172051 -- Star". SIMBAD. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+172051&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2006&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000.0&Equi2=1950.0&Equi3=2000.0&Epoch1=2000.0&Epoch2=1950.0&Epoch3=2000.0. Retrieved 2006-08-04.  "HD 172051 / HR 6998". SolStation. http://www.solstation.com/stars2/hd172051.htm. Retrieved 2006-08-04.  ‹ The template below (Nearest bright star systems) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · eStar systems within 70 light-years of absolute magnitude ≤+8.5 Star systems within 70 light-years from Earth with brightest member's absolute magnitude of +8.5 or brighter. ‹ The template below (Bright star systems within 0 – 10 light-years) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · e0–10 ly A V (White) Sirius (8.58 ly; 2s) G V (Yellow) Solar System (0 ly; 1s, 8p) • Alpha Centauri (4.36 ly; 3s: Alpha¹ Centauri • Alpha² Centauri • Proxima Centauri (4.24 ly)) ‹ The template below (Bright star systems within 10 – 20 light-years) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · e10–20 ly A V (White) Altair (16.69 ly; 1s) F V (Yellow-white) Procyon (11.44 ly; 2s) G V (Yellow) Tau Ceti (11.90 ly; 1s) • Sigma Draconis «Alsafi» (18.77 ly; 1s) • Eta Cassiopeiae «Achird» (19.39 ly; 2s) • e (82 G.) Eridani (19.71 ly; 1s) • Delta Pavonis (19.92 ly; 1s) K V (Orange) Epsilon Eridani (10.48 ly; 1s, 2p: planet b • planet c) • 61 Cygni (11.40 ly; 2s) • Epsilon Indi (11.81 ly; 1s, 2bd) • Groombridge 1618 (15.87 ly; 1s) • Omicron² (40) Eridani «Keid» (16.25 ly; 3s) • 70 Ophiuchi (16.64 ly; 2s) • 33 G. Librae (19.12 ly; 3s, 1bd) • 36 Ophiuchi (19.40 ly; 3s) • Gliese 783 (19.62 ly; 2s) ‹ The template below (Bright star systems within 20 – 30 light-years) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · e20–30 ly A V (White) Fomalhaut (25.1 ly; 1s, 1p: planet b)‡ • Vega (25.3 ly; 1s) F V (Yellow-white) Pi³ Orionis «Tabit» (26.2 ly; 1s) • Chi Draconis (26.3 ly; 2s) • Zeta Tucanae (28.0 ly; 1s) • Gamma Leporis (29.3 ly; 2s) G (Yellow) IV Beta Hydri (24.4 ly; 1s) • Mu Herculis (27.4 ly; 3s) V Xi Boötis (22.1 ly; 2s) • Xi Ursae Majoris «Alula Australis» (27.3 ly; 3s, 1bd) • Beta Canum Venaticorum «Chara» (27.3 ly; 1s) • 61 Virginis (27.8 ly; 1s, 3p: planet b • planet c • planet d) • Chi¹ Orionis (28.3 ly; 2s) • 41 G. Arae (28.7 ly; 2s) • Beta Comae Berenices (29.9 ly; 1s)‡ • Kappa¹ Ceti (29.9 ly; 1s)‡ VI Mu Cassiopeiae «Marfak-West» (24.6 ly; 2s) • Groombridge 1830 (29.9 ly; 1s)‡ K (Orange) IV Delta Eridani «Rana» (29.5 ly; 1s) V Gliese 892 (21.3 ly; 1s) • Gliese 667 (23.3 ly; 3s, 1p: planet Cb) • HR 753 (23.5 ly; 3s) • Gliese 33 (24.3 ly; 1s) • 107 Piscium (24.4 ly; 1s) • TW Piscis Austrini (24.9 ly; 1s)‡ • Gliese 673 (25.2 ly; 1s)‡ • Gliese 884 (26.6 ly; 1s) • p Eridani (26.6 ly; 2s) • Gliese 250 (28.4 ly; 2s) • HR 1614 (28.8 ly; 1s) • HR 7722 (28.8 ly; 1s, 1p: planet b) ‹ The template below (Bright star systems within 30 – 40 light-years) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · e30–40 ly Giant star K III Pollux (33.7 ly; 1s, 1p: planet b) • Arcturus (36.7 ly; 1s) A (White) IV Delta Capricorni «Scheddi» (38.6 ly; 4s) V Denebola (36.2 ly; 1s) F (Yellow- white) IV Zeta Herculis «Rutilicus» (35.2 ly; 2s) V Gamma Pavonis (30.1 ly; 1s)‡ • Beta Virginis «Zavijava» (35.6 ly; 2s) • Gamma Serpentis (36.3 ly; 1s) • Theta Persei (36.6 ly; 2s) • Zeta Doradus (38.0 ly; 1s) • Iota Pegasi (38.3 ly; 2s) • Gamma Virginis «Porrima» (38.6 ly; 2s) • Zeta Trianguli Australis (39.5 ly; 2s) G (Yellow) IV Eta Boötis «Muphrid» (37.0 ly; 2s) V HR 4523 (30.1 ly; 2s, 1p: planet b) • 61 Ursae Majoris (31.1 ly; 1s) • Alpha Mensae (33.1 ly; 1s) • Iota Persei (34.4 ly; 1s) • Delta Trianguli (35.4 ly; 2s) • 11 Leonis Minoris (36.5 ly; 2s) • Lambda Serpentis (38.3 ly; 1s) • Zeta Reticuli (39.4 ly; 2s) K V (Orange) HR 4458 (31.1 ly; 2s) • Gliese 638 (31.9 ly; 1s) • 12 Ophiuchi (31.9 ly; 1s) • HR 511 (32.5 ly; 1s) • HR 5256 (33.0 ly; 1s) • Gliese 453 (33.2 ly; 1s) • HR 857 (33.9 ly; 1s) • Gliese 688 (34.9 ly; 1s) • Gliese 653 (35.1 ly; 2s) • HR 9038 (35.2 ly; 2s) • HR 637 (35.6 ly; 2s, 1p: planet b) • HR 6806 (36.2 ly; 1s) • 54 Piscium (36.2 ly; 1s, 1bd, 1p: planet b) • Gliese 320 (36.3 ly; 1s) • Gliese 370 (36.4 ly; 1s) • Gliese 505 (36.6 ly; 2s) • Gliese 208 (37.1 ly; 1s) • Gliese 902 (37.2 ly; 1s) • Gliese 169 (37.4 ly; 1s) • HR 5553 (37.6 ly; 2s) • Gliese 773.6 (38.5 ± 5.8 ly; 1s) • Gliese 542 (38.6 ly; 1s) • Gliese 414 (38.9 ly; 2s) • Gliese 798 (39.5 ly; 1s)‡ • HR 3384 (39.7 ly; 1s)‡ • HR 1925 (39.9 ly; 1s)‡ M V (Red dwarf) Gliese 617 (34.8 ly; 2s) • Gliese 488 (35.2 ly; 1s) ‹ The template below (Bright star systems within 40 – 50 light-years) is being considered for deletion. See templates for discussion to help reach a consensus.› v · d · e40–50 ly Giant star A III Alpha Ophiuchi «Rasalhague» (46.7 ly; 1s) G III Capella (42.2 ly; 4s) A (White) IV Alpha Cephei «Alderamin» (48.8 ly; 1s) V Iota Ursae Majoris «Talitha Borealis» (47.7 ly; 4s) F (Yellow- white) IV Beta Trianguli Australis (40.2 ly; 2s)‡ • Theta Ursae Majoris «Alhaud» (44.0 ly; 3s) V 36 Ursae Majoris (41.9 ly; 2s) • Upsilon Andromedae (43.9 ly; 2s, 4p: planet b • planet c • planet d • planet e) • 10 Tauri (44.8 ly; 2s) • Iota Piscium (45.0 ly; 1s) • Tau¹ Eridani (45.6 ly; 2s) • Alpha Fornacis «Dalim» (46.0 ly; 2s) • Theta Boötis «Asellus Primus» (47.5 ly; 2s) • 111 Tauri (47.8 ly; 2s) • Psi Capricorni «Yue» (47.9 ly; 1s) • Alpha Corvi «Alchiba» (48.2 ly; 1s) • Eta Leporis (49.1 ly; 1s) • Nu Phoenicis (49.1 ly; 1s) • 19 Draconis (49.2 ly; 2s) G (Yellow) IV Beta Aquilae «Alshain» (44.7 ly; 2s) • b (31) Aquilae (49.4 ly; 3s) V 85 Pegasi (40.5 ly; 3s)‡ • Rho¹ (55) Cancri (40.9 ly; 2s, 5p: planet e • planet b • planet c • planet f • planet d) • HR 483 (41.2 ly; 2s) • Lambda Aurigae «Al Hurr» (41.2 ly; 2s) • HR 683 (41.4 ly; 1s) • i (44) Boötis (41.6 ly; 3s) • HR 6094 (42.0 ly; 2s, 1p: planet b) • HR 6998 (42.4 ly; 1s) • 58 Eridani (43.4 ly; 1s) • HR 8501 (44.4 ly; 2s) • 18 Scorpii (45.7 ly; 1s) • 47 Ursae Majoris (45.9 ly; 1s, 3p: planet b • planet c • planet d) • 26 Draconis (46.0 ly; 3s) • Pi¹ Ursae Majoris (46.6 ly; 1s) • Gliese 611 (46.9 ly; 2s) • 72 Herculis (46.9 ly; 1s) • Nu² Lupi (47.5 ly; 1s) • HR 7898 (47.8 ly; 1s) • Psi Serpentis (47.9 ly; 2s) • HR 3862 (48.5 ly; 1s) • 20 Leonis Minoris «Cor» (48.6 ly; 1s) • HR 209 (48.7 ly; 2s) • HD 176051 (48.9 ly; 2s, 1p: planet b) • 171 G. Puppis (49.6 ly; 2s) • HR 5864 (49.7 ly; 2s)‡ • Mu Arae (49.9 ly; 1s, 4p: planet d • planet e • planet b • planet c)‡ K (Orange) IV HR 4587 (42.1 ly; 1s) • Gamma Cephei «Errai» (45.0 ly; 2s, 1p: planet b) • Eta Cephei «Al Agemim» (46.8 ly; 1s) V Gliese 435 (40.8 ly; 1s) • HR 3259 (41.0 ly; 1s, 3p: planet b • planet c • planet d) • Gliese 142 (41.2 ly; 1s) • Gliese 349 (41.4 ly; 1s) • HR 6518 (41.7 ly; 1s) • HD 40307 (41.8 ly; 1s, 3p: planet b • planet c • planet d) • Gliese 428 (42.0 ly; 2s) • Gliese 707 (42.2 ly; 1s) • Gliese 204 (42.3 ly; 1s) • Gliese 167 (42.7 ly; 1s) • Gliese 775 (42.8 ly; 1s) • Gliese 425 (42.9 ly; 2s) • Gliese 716 (43.1 ly; 1s) • Gliese 146 (43.6 ly; 1s) • GJ 1267 (43.6 ly; 1s) • Gliese 556 (43.8 ly; 1s) • Gliese 69 (43.8 ly; 1s) • Gliese 174 (44.0 ly; 1s) • Gliese 868 (44.2 ly; 1s) • Gliese 528 (44.5 ly; 2s) • Gliese 656 (44.6 ly; 1s) • Gliese 5 (44.7 ly; 2s) • Gliese 615 (44.8 ly; 1s) • Gliese 898 (45.5 ly; 3s) • Gliese 532 (45.6 ly; 1s) • HD 23356 (45.8 ly; 1s) • Gliese 42 (45.9 ly; 1s) • Gliese 726 (46.1 ly; 1s) • Gliese 529 (46. 3ly; 1s) • Gliese 282 (46.3 ly; 2s) • Gliese 770 (46.4 ly; 2s) • Gliese 481 (46.6 ly; 1s) • Gliese 613 (46.8 ly; 1s) • HD 150689 (46.9 ly; 1s) • Gliese 546 (47.0 ly; 1s) • Gliese 259 (47.7 ly; 1s) • Gliese 233 (47.8 ly; 2s) • Gliese 604 (47.8 ly; 1s) • Gliese 420 (47.9 ly; 2s) • Gliese 833 (48.1 ly; 1s) • Gliese 269 (48.2 ly; 2s) • Gliese 818 (48.4 ly; 1s) • AB Doradus (48.7 ly; 2s) • Gliese 14 (48.9 ly; 1s) • Gliese 52 (49.1 ly; 1s)‡ • Gliese 483 (49.1 ly; 1s) • GJ 1279 (49.2 ly; 1s) • Gliese 141 (49.3 ly; 1s)‡ • Gliese 225.2 (49.4 ly; 3s)‡ • Gliese 40 (49.6 ly; 2s)‡ M V (Red dwarf) HD 175224 (41.2 ly; 2s)‡ • Gliese 215 (44.7 ly; 1s) • Gliese 400 (46.0 ly; 2s) • Gliese 123 (48.8 ly; 1s) v · d · e50–60 ly v · d · e60–70 ly In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Components: s – star, bd – brown dwarf, p – planet.