20 Puppis

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] The star lies approximately 990 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]

20 Puppis
Location of 20 Puppis (circled)
Observation data
Epoch 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[1] mas
Distance990 ± 40 ly
(300 ± 10 pc)
Absolute magnitude (MV)−2.12[5]
Details
Mass5.2±0.2[6] M☉
Radius47.60+1.55
−1.16[1] R☉
Luminosity1087.12±53.98[1] L☉
Surface gravity (log g)0.80[7] cgs
Temperature4,804+59
−77[1] K
Metallicity [Fe/H]−0.18[5] dex
Rotational velocity (v sin i)6.9[8] km/s
Age90[6] Myr
Other designations
20 Pup, BD−15°2324, FK5 311, GC 11184, HD 68752, HIP 40259, HR 3229, SAO 153993, GSC 05996-02764[9]
Database references
SIMBADdata

This object has a stellar classification of G4 Ib-II,[3] matching a G-type star with a luminosity class part way between a bright giant and a supergiant star. It is just 90[6] million years old with around five[6] times the mass of the Sun. The star has expanded to 48[1] times the Sun's radius and is radiating 1,087[1] times as much luminosity as the Sun from its enlarged photosphere at an effective temperature of 4,804 K.[1]

References
  1. 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.
  2. 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.
  3. 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.
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. 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. Vizier catalog entry
  6. 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.
  7. 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.
  8. 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
  9. "20 Pup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-04.
  10. 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.
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