HD 85622

This article is about m Velorum. For M Velorum, see HD 83446.
HD 85622
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 09h 51m 40.66782s[1]
Declination −46° 32′ 51.4329″[1]
Apparent magnitude (V) 4.58[2]
Characteristics
Evolutionary stage supergiant[3]
Spectral type G5 Ib[3] or G6 IIa[4]
B−V color index 1.20[5]
Astrometry
Radial velocity (Rv)+7.8±3.2[6] km/s
Proper motion (μ) RA: −24.784[1] mas/yr
Dec.: +9.843[1] mas/yr
Parallax (π)4.3323 ± 0.1445 mas[1]
Distance750 ± 30 ly
(231 ± 8 pc)
Absolute magnitude (MV)−2.96[2]
Orbit[3]
Period (P)329.266±0.085 d
Eccentricity (e)0 (adopted)
Periastron epoch (T)2453860.281±0.074 HJD
Semi-amplitude (K1)
(primary)		13.021±0.012 km/s
Details
Mass6.2±0.5[7] M☉
Luminosity1908.45[8] L☉
Temperature4,796[8] K
Rotational velocity (v sin i)19.3±1.0[5] km/s
Age63.7±15.8[7] Myr
Other designations
m Vel, CD−45° 5508, HD 85622, HIP 48374, HR 3912, SAO 221553[9]
Database references
SIMBADdata

HD 85622 is a binary star system in the southern constellation of Vela. It is visible to the naked eye with an apparent visual magnitude of 4.58.[2] The distance to HD 85622 can be estimated from its annual parallax shift of 4.3 mas,[1] yielding a value of 750 light years. It is moving further from the Earth with a heliocentric radial velocity of +8 km/s.[6]

This is a single-lined spectroscopic binary with a circular orbit and a period of 329.3 days. The a sin i value is 0.39 AU, where a is the semimajor axis and i is the orbital inclination to the line of sight.[3] This value provides a lower bound on the actual semimajor axis. The system shows a micro-variability in its brightness,[3] and is a source of X-ray emission with an apparent flux of 42.6×10−17 W/m2.[10]

The visible component is a supergiant star with a stellar classification of G5 Ib[3] or G6 IIa.[4] It is about 64[7] million years old with a projected rotational velocity of 19 km/s.[5] The star has 6.2[7] times the mass of the Sun and is radiating 1,908[8] times the Sun's luminosity from its photosphere at an effective temperature of 4,796 K.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Hearnshaw2012 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 c Cite error: The named reference DeMedeiros2002 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference McDonald2012 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 Schmitt1998 was invoked but never defined (see the help page).