HD 89998

HD 89998
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10h 22m 19.58477s[1]
Declination −41° 38′ 59.8592″[1]
Apparent magnitude (V) 4.82[2]
Characteristics
Spectral type K1 III[3]
B−V color index 1.095±0.055[2]
Astrometry
Radial velocity (Rv)+20.9±0.8[4] km/s
Proper motion (μ) RA: −27.664[1] mas/yr
Dec.: +60.090[1] mas/yr
Parallax (π)15.9154 ± 0.1375 mas[1]
Distance205 ± 2 ly
(62.8 ± 0.5 pc)
Absolute magnitude (MV)0.84[2]
Details
Radius11.6[5] R☉
Luminosity54.04[6] L☉
Temperature4,812[6] K
Other designations
r Vel, NSV 4837, CD−41° 5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998[7]
Database references
SIMBADdata

HD 89998 (r Velorum) is a single[8] star in the southern constellation of Vela. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.82.[2] The distance to HD 89998, as determined from its annual parallax shift of 15.9 mas,[1] is 205 light years. The star is moving further from the Earth with a heliocentric radial velocity of +21 km/s,[4] having come within 140 ly some 1.552 million years ago.[2]

This is an evolved giant star with a stellar classification of K1 III.[3] The measured angular diameter of this star, after correcting for limb darkening, is 1.72±0.02 mas.[9] At the estimated distance of this star, this yields a physical size of 11.6 times the radius of the Sun.[5] It is radiating 54[6] times the Sun's luminosity from its enlarged photosphere at en effective temperature of 4,812 K.[6]

  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 d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).