HD 90362

HD 90362
Location of HD 90362 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 25m 44.27091s[1]
Declination −07° 03′ 35.3764″[1]
Apparent magnitude (V) 5.56[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type K6 III Fe −0.5[4]
U−B color index +1.86[2]
B−V color index +1.53[2]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)35.60±0.25[6] km/s
Proper motion (μ) RA: −135.763 mas/yr[1]
Dec.: +130.341 mas/yr[1]
Parallax (π)7.127 ± 0.1702 mas[1]
Distance460 ± 10 ly
(140 ± 3 pc)
Absolute magnitude (MV)+0.19[7]
Details
Mass0.44±0.14[8] M☉
Radius41.1±2.1[9] R☉
Luminosity252±9[10] L☉
Surface gravity (log g)0.96+0.02
−0.03[11] cgs
Temperature3,804[12] K
Metallicity [Fe/H]−0.10±0.05[8] dex
Rotational velocity (v sin i)1.5±1.0[13] km/s
Age11.0+1.9
−1.6[8] Gyr
Other designations
47 G. Sextantis[14], NSV 18399, BD−06°3146, FK5 2836, GC 14321, HD 90362, HIP 51046, HR 4092, SAO 137557, CCDM J10258-0704A, WDS J10257-0704A, TIC 36881111[15]
Database references
SIMBADdata

HD 90362 (HR 4092; 47 G. Sextantis) is a solitary star[16] located in the equatorial constellation Sextans. It is faintly visible to the naked eye as a redish-orange-hued point of light with an apparent magnitude of 5.56.[2] Gaia DR3 parallax measurements imply a distance of approximately 460 light-years[1] and it is receding with a heliocentric radial velocity of 35.6 km/s.[6] At its current distance, HD 90362's brightness is diminished by an interstellar extinction of 0.19 magnitudes[17] and it has an absolute magnitude of +0.19.[7]

HD 90362 is an old population II star[18] with a stellar classification of K6 III Fe −0.5,[4] indicating that it is an evolved K-type giant that has exhausted hydrogen at its core and left the main sequence along with a mild spectral underabundance of iron. It is currently on the asymptotic giant branch, generating energy via the fusion of hydrogen and helium shells around an inert carbon core.[3] It has only 44% the mass of the Sun[8] but at the age of 11 billion years,[8] it has expanded to 41.1 times the radius of the Sun.[9] It radiates 252 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 3,804 K.[12] HD 90362 is metal deficient with an iron abundance of [Fe/H] = −0.1 or 79.4% of the Sun's[8] and it spins slowly with a projected rotational velocity of approximately 1.5 km/s.[13]

The variability of the star was first detected in 1997 by the Hipparcos mission.[19] It found variations between 5.69 and 5.72 in the Hipparcos passband. As of 2004, its variability has not been confirmed.[20] HD 90362 has an optical companion located 142.6" away along a position angle of 100° as of 2010.[21] It was first observed by M. Scaria in 1981.[21]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2009 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Poggio2022 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Ting2019 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Cacciaria1987 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Perryman1997 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Samus2004 was invoked but never defined (see the help page).
  21. ^ a b Cite error: The named reference Mason2001 was invoked but never defined (see the help page).