Xi2 Canis Majoris
Template:Other stars by Bayer designation
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Canis Major |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.54[2] |
| Characteristics | |
| Spectral type | A0 V[3][4] or A0 III[5] |
| U−B Template:Engvar | −0.01[2] |
| B−V Template:Engvar | −0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | Template:Val[6] km/s |
| Proper motion (μ) | RA: +15.437[1] mas/yr Dec.: +18.682[1] mas/yr |
| Parallax (π) | 8.3465±0.2721 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.94[7] |
| Details | |
| Radius | 5.959[8] Template:Solar radius |
| Luminosity | 247[8] Template:Solar luminosity |
| Temperature | 9,381[8] K |
| Rotational velocity (v sin i) | 145[9] km/s |
| Age | 339[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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Xi2 Canis Majoris, which is Latinized from ξ2 Canis Majoris, is an astrometric binary[4] star system in the southern constellation of Canis Major. With an apparent visual magnitude of +4.54,[2] it is visible to the naked eye. Based upon an annual parallax shift of Template:Val,[1] the system is approximately 390 light years distant from Earth. It is receding with a radial velocity of +26 km/s.[6]
The binary nature of this system was determined based on changes in the proper motion of the visible component.[11] Buscombe (1962) gave the white-hued primary a stellar classification of A0 V,[3] indicating it is an A-type main-sequence star. However, Houk and Smith-Moore (1978) list it with a class of A0 III,[5] which would match a more evolved giant star, also of the A-type. It is 339[7] million years old with a high rate of spin, having a projected rotational velocity of 145 km/s.[9] The star is six times larger than the Sun, radiating 247 times the Sun's luminosity from its photosphere at an effective temperature of 9,381 K.[8]
References
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