20 Puppis

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 mas[1]
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☉
Luminosity1,087.12±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

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]

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]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference XHIP was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference leonid09 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Soubiran2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference deMedeiros1999 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).