HD 50281

HD 50281
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 06h 52m 18.05045s[1]
Declination −05° 10′ 25.36617″[1]
Apparent magnitude (V) 6.58[2]
Characteristics
Evolutionary stage main sequence
Spectral type K3.5 V[3]
B−V color index 1.071±0.008[2]
Astrometry
Radial velocity (Rv)−7.20±0.15[4] km/s
Proper motion (μ) RA: −543.616[1] mas/yr
Dec.: −3.491[1] mas/yr
Parallax (π)114.2968 ± 0.0465 mas[1]
Distance28.54 ± 0.01 ly
(8.749 ± 0.004 pc)
Absolute magnitude (MV)6.87[5]
Details
Mass0.79[6] M☉
Radius0.73+0.01
−0.02[1] R☉
Luminosity0.225[1] L☉
Surface gravity (log g)4.64[6] cgs
Temperature4,712±8.5[7] K
Metallicity [Fe/H]+0.01[8] dex
Rotational velocity (v sin i)5.5[6] km/s
Age1.88[6] Gyr
Other designations
88 G. Monocerotis, BD−05°1844, GJ 250, HD 50281, HIP 32984, HR 2534, SAO 133805, WDS J06523−0510, LFT 494, LHS 1875, LTT 2662[9]
Database references
SIMBADA
B

HD 50281 is a star in the equatorial constellation of Monoceros. It is orange in hue with an apparent visual magnitude of 6.58,[2] which lies at or below the typical limit of visibility to the naked eye. The star is located at a distance of 28.5 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −7.2 km/s.[4]

This object is an ordinary K-type main-sequence star with a stellar classification of K3.5 V.[3] It is nearly two billion years old and is spinning with a projected rotational velocity of 5.5 km/s.[6] The metallicity of this star – what astronomers term the abundance of elements with atomic numbers greater than helium – is near solar. The star has 79%[6] of the mass of the Sun and 73%[1] of the Sun's radius. It is radiating 22.5%[1] of the luminosity of the Sun from its photosphere at an effective temperature of 4,712 K.[7]

A magnitude 10.16 common proper motion companion,[10] designated component B, is located at an angular separation of 58.8″ along a position angle of 181° from the primary, as of 2015.[10] This is a suspected binary star system[11] with components of individual visual magnitude 10.6 and 11.1,[10] and a class of M2.5 V.[12] The coordinates of this companion are a source of X-ray emission.[13] A third companion, magnitude 14.04 component C, lies at a separation of 9.6″ from component B.[10]

  1. ^ a b c d e f g h i 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 Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Bailer2018 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa411_3_559 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference apj748_2_934 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. ^ a b c d Cite error: The named reference Mason2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mason2018 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kirkpatrick1991 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Johnson1986 was invoked but never defined (see the help page).