HD 92845

HD 92845
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 42m 43.1844s[1]
Declination −32° 42′ 56.413″[1]
Apparent magnitude (V) 5.62±0.01[2]
Characteristics
Evolutionary stage subgiant[3]
Spectral type A0 V[4]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)4.5±0.5[6] km/s
Proper motion (μ) RA: −28.903 mas/yr[1]
Dec.: +1.262 mas/yr[1]
Parallax (π)4.1113 ± 0.2655 mas[1]
Distance790 ± 50 ly
(240 ± 20 pc)
Absolute magnitude (MV)−0.67[7]
Details
Mass3.1±0.1[3] M☉
Radius5.31[8] R☉
Luminosity206+72
−53[3] L☉
Surface gravity (log g)3.5[9] cgs
Temperature9,376±109[8] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)81±3[11] km/s
Age282±34[12] Myr
Other designations
78 G. Antilae[13], CD−32°7572, CPD−32°2953, FK5 1277, GC 14732, HIP 52407, HR 4194, SAO 201665, WDS J10427-3243A[14]
Database references
SIMBADdata

HD 92845 (HR 4194) is a probable astrometric binary[15] in the southern constellation Antlia. It has an apparent magnitude of 5.62, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 790 light years and it is currently receding with a heliocentric radial velocity of 4.5 km/s.

HD 92845 has a stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star. However, stellar evolution models from Zorec and Royer reveal it to be a subgiant that has just left the main sequence.[3] It has 3.1 times the mass of the Sun[3] but has expanded to an enlarged radius of 5.31 R☉.[8] It radiates with a luminosity 206 times greater than the Sun[3] from its photosphere at an effective temperature of 9,376 K,[8] giving a white hue. At an age of 282 million years,[12] HD 92845 spins quickly with a projected rotational velocity of 81 km/s.[11]

There is an optical companion 17″ away along a position angle of 214° as of 1999.[16]

  1. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cucchiaro1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Gerbaldi1999 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).