HD 91942

This article is about r Carinae. For the variable star, see R Carinae.
HD 91942
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 35m 35.29721s[1]
Declination −57° 33′ 27.4835″[1]
Apparent magnitude (V) 4.45[2]
Characteristics
Evolutionary stage Bright giant[3]
Spectral type K3II-IIb[4]
B−V color index 1.604±0.004[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)+9.9±0.7[2] km/s
Proper motion (μ) RA: −15.93[1] mas/yr
Dec.: +0.49[1] mas/yr
Parallax (π)2.77 ± 0.17 mas[1]
Distance1,180 ± 70 ly
(360 ± 20 pc)
Absolute magnitude (MV)−3.77[2]
Details
Mass8.1±0.7[6] M☉
Radius155.5+5.6
−11.3[7] R☉
Luminosity5,485±693[7] L☉
Surface gravity (log g)2.0[3] cgs
Temperature3,983+152
−69[7] K
Metallicity [Fe/H]0.0[3] dex
Rotational velocity (v sin i)5.8[3] km/s
Age35.7±8.3[6] Myr
Other designations
r Car, NSV 4904, CPD−56°3544, FK5 393, GC 14570, HD 91942, HIP 51849, HR 4159, SAO 238222[8]
Database references
SIMBADdata

HD 91942 is a single[9] variable star in the constellation Carina. It has the Bayer designation r Carinae, while HD 91942 is the identifier from the Henry Draper catalogue. This orange-hued object is visible to the naked eye with an apparent visual magnitude of 4.45.[2] Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun.[1] The star has an absolute magnitude of −3.77,[2] and is drifting further away with a radial velocity of +9.9 km/s.[2]

This object is a massive, aging bright giant with a stellar classification of K3II-IIb.[4] It is a suspected variable star that fluctuates in magnitude by an amplitude of 0.05 in the B-band of the UBV photometric system.[5] With the supply of hydrogen exhausted at its core, it has evolved of the main sequence and cooled and expanded to 156[7] times the Sun's radius. It is an estimated 36[6] million years old with eight[6] times the mass of the Sun. It is radiating around 5,500[7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,983 K.[7]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Lèbre2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).