HD 56405
Star in the constellation Canis Major
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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.[3] To the east of HD 56405 is the open cluster NGC 2360, also known as Caroline's Cluster.[10] The distance to HD 56405, as determined from parallax measurements, is approximately 252 light years. It is drifting further away with a radial velocity (RV) of about +6 km/s.[6] Although classed as a single star,[11] it is to suspected to vary in RV.[12]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major[1] |
| Right ascension | 07h 16m 14.55266s[2] |
| Declination | −15° 35′ 08.4862″[2] |
| Apparent magnitude (V) | 5.45[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | A1V[5] |
| B−V color index | 0.079±0.005[1] |
| Astrometry | |
| Radial velocity (Rv) | +6.30±0.9[6] km/s |
| Proper motion (μ) | RA: −45.415[2] mas/yr Dec.: −14.578[2] mas/yr |
| Parallax (π) | 12.9537±0.0714 mas[2] |
| Distance | 252 ± 1 ly (77.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.88[1] |
| Details | |
| Mass | 2.13[7] M☉ |
| Radius | 2.47[8] R☉ |
| Luminosity | 38.86[1] L☉ |
| Surface gravity (log g) | 4.14±0.14[7] cgs |
| Temperature | 9,562±325[7] K |
| Rotational velocity (v sin i) | 149[7] km/s |
| Age | 212[7] Myr |
| Other designations | |
| BD−15°1734, FK5 2561, GC 9657, GJ 9228, HD 56405, HIP 35180, HR 2758, SAO 152641, TYC 5965-363-1[9] | |
| Database references | |
| SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A1V.[5] It was classed as a candidate Lambda Boötis star,[13] 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.[3] 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.[7] It is radiating 39[1] times the luminosity of the Sun from its photosphere at an effective temperature of around 9,562 K.[7]