HD 56405

HD 56405
Location of HD 56405 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 07h 16m 14.55342s[1]
Declination −15° 35′ 08.4724″
Apparent magnitude (V) 5.45[2]
Characteristics
Spectral type A1V[3]
B−V color index 0.079±0.005[4]
Astrometry
Radial velocity (Rv)+6.30±0.9[5] km/s
Proper motion (μ) RA: -46.118[1] mas/yr
Dec.: -15.488[1] mas/yr
Parallax (π)13.1152 ± 0.1293 mas[1]
Distance249 ± 2 ly
(76.2 ± 0.8 pc)
Absolute magnitude (MV)0.88[4]
Details
Mass2.13[6] M☉
Luminosity38.86[4] L☉
Surface gravity (log g)4.14±0.14[6] cgs
Temperature9,562±325[6] K
Rotational velocity (v sin i)149[6] km/s
Age212[6] Myr
Other designations
BD−15°1734, FK5 2561, GC 9657, GJ 9228, HD 56405, HIP 35180, HR 2758, SAO 152641, TYC 5965-363-1[7]
Database references
SIMBADdata

HD 56405 is a star in the southern constellation of Canis Major. It is white in hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.45.[2] To the east of HD 56405 is the open cluster NGC 2360, also known as Caroline's Cluster.[8] The distance to HD 56405, as determined from parallax measurements, is approximately 249 light years. It is drifting further away with a radial velocity (RV) of about +6 km/s.[5] Although classed as a single star,[9] it is to suspected to vary in RV.[10]

This is an A-type main-sequence star with a stellar classification of A1V.[3] It was classed as a candidate Lambda Boötis star,[11] but as of 2015 this classification has been rejected by astronomers due to the star having an inconsistent UV flux, possible RV variability, and a fairly high rotation rate.[2] The star is about 212 million years old with 2.13 times the mass of the Sun and is spinning with a projected rotational velocity of 149 km/s.[6] It is radiating 39[4] times the luminosity of the Sun from its photosphere at an effective temperature of around 9,562 K.[6]

  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Murphy2015 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 c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference David2015 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 Streicher2005 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gerbaldi2003 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Renson1990 was invoked but never defined (see the help page).