Star in the constellation Puppis
20 Puppis
Location of 20 Puppis (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Puppis
Right ascension 08h 13m 19.96710s [ 1]
Declination
−15° 47′ 17.6008″[ 1]
Apparent magnitude (V)4.99[ 2]
Characteristics
Spectral type
G4 Ib-II[ 3]
U−B color index
+0.78[ 2]
B−V color index
+1.07[ 2]
Astrometry Radial velocity (Rv )+16.80[ 4] km/s Proper motion (μ) RA: −12.718[ 1] mas /yr Dec.: −4.270[ 1] mas /yr Parallax (π)3.2906± 0.1404 mas [ 1] Distance 990 ± 40 ly pc ) Absolute magnitude (MV )−2.12[ 5] Details Mass ± 0.2[ 6] M ☉ Radius +1.55 [ 1] R ☉ Luminosity ± 53.98[ 1] L ☉ Surface gravity (log g )0.80[ 7] cgs Temperature +59 [ 1] K Metallicity [Fe/H] −0.18[ 5] dex Rotational velocity (v sin i )6.9[ 8] Age 90[ 6] Myr Other designations 20 Pup , BD −15°2324FK5 311GC 11184HD 68752HIP 40259HR 3229SAO 153993GSC 05996-02764[ 9] Database references SIMBAD data
20 Puppis is a solitary[ 10] star in the southern constellation of Puppis . It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.99.[ 2] light years away from the Sun based on parallax . It is receding from the Earth with a heliocentric radial velocity of +16.8 km/s.[ 4]
This object has a stellar classification of G4 Ib-II,[ 3] G-type star with a luminosity class part way between a bright giant and a supergiant star . It is just 90[ 6] [ 6] mass of the Sun . The star has expanded to 48[ 1] Sun's radius and is radiating 1,087[ 1] luminosity as the Sun from its enlarged photosphere at an effective temperature of 4,804 K.[ 1]
References
^ a b c d e f g h i j k Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018). "Gaia Data 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 source at VizieR .^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues . 2237 . Bibcode :2002yCat.2237....0D . ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series . 71 : 245. Bibcode :1989ApJS...71..245K . doi :10.1086/191373 . ^ a b Gontcharov, G. A. (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 . S2CID 119231169 . ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 . Vizier catalog entry ^ a b c d Lyubimkov, Leonid S.; et al. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood" . Monthly Notices of the Royal Astronomical Society . 402 (2): 1369. arXiv :0911.1335 Bibcode :2010MNRAS.402.1369L . doi :10.1111/j.1365-2966.2009.15979.x S2CID 119096173 . ^ Soubiran, Caroline; et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics . 591 : A118. arXiv :1605.07384 Bibcode :2016A&A...591A.118S . doi :10.1051/0004-6361/201628497 . S2CID 119258214 . ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series . 139 (3): 433. arXiv :astro-ph/0608248 Bibcode :1999A&AS..139..433D . doi :10.1051/aas:1999401 . Vizier catalog entry ^ "20 Pup" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-06-04 .^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society . 389 (2): 869. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 .
