| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h44m 28.46710s[2] |
| Declination | −31° 04′ 13.8923″[2] |
| Apparent magnitude (V) | 5.23[3] (5.13–5.44)[4] |
| Characteristics | |
| Spectral type | B2 V[5] or B2 IIIe[6] |
| B−V color index | −0.127±0.005[3] |
| Variable type | Be[4] |
| Astrometry | |
| Radial velocity (Rv) | +34.0±4.2[7] km/s |
| Proper motion (μ) | RA: −3.286[2] mas/yr Dec.: +4.201[2] mas/yr |
| Parallax (π) | 1.6454 ± 0.0722 mas[2] |
| Distance | 1,980 ± 90 ly (610 ± 30 pc) |
| Details | |
| Mass | 19.2±0.1[8] M☉ |
| Radius | 10.0[9] R☉ |
| Luminosity | 44,463+35,336 −19,689[10] L☉ |
| Surface gravity (log g) | 3.76±0.17[10] cgs |
| Temperature | 25,350±1,030[10] K |
| Rotation | 2.63 d[11] |
| Rotational velocity (v sin i) | 205±5[12] km/s |
| Age | 8.2±0.1[8] Myr |
| Other designations | |
10 CMa, FT Canis Majoris, CD−30°3484, GC 8827, HD 48917, HIP 32292, HR 2492, SAO 197149, CCDM 06445-3104, WDS J06445-3104[13] | |
| Database references | |
| SIMBAD | data |
10 Canis Majoris is a single[14] variable star in the southern constellationofCanis Major,[13] located roughly 1,980 light years away from the Sun.[2] It has the variable star designation FT Canis Majoris; 10 Canis Majoris is the Flamsteed designation. This body is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.23.[3] It is moving away from the Earth with a heliocentric radial velocity of +34 km/s.[7]
This is a massive Be star[9] with a stellar classification of B2 V,[5] matching a B-type main-sequence star. Hiltner et al. (1969) found a giant class of B2 IIIe,[6] which is still in use with some studies.[14][4] The star is spinning rapidly with a projected rotational velocity of 205 km/s[12] and a rotational period of 2.63 days.[11] This is giving it an oblate shape with an equatorial bulge that is 5% larger than the polar radius.[15] The axis of rotation is inclined by an angle of 45° to the line of sight from the Earth.[9] Samus et al. (2017) classify it as a Be-type variable star that ranges from a peak visual magnitude of 5.13 down to 5.44 with a rotationally-modulated period of 2.63 days.[4][11]
10 Canis Majoris is 8.2[8] million years old with 19.2[8] times the mass of the Sun and 10[9] times the Sun's radius. It is radiating around 44,000[10] times the luminosity of the Sun from its photosphere at an effective temperature of 25,000 K.[10] There is a magnitude 12.58 visual companion at an angular separationof37.3″ along a position angle of 99°, as of 2015.[16]
|
| |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Stars |
| ||||||||||||
| |||||||||||||
| Star clusters |
| ||||||||||||
| |||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
