HD 70930
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 4.79[1] (5.14 + 6.08)[3] |
| Characteristics | |
| Spectral type | B1V[4] or B2III[5] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[2] mas/yr Dec.: Script error: No such module "val".[2] mas/yr |
| Parallax (π) | 1.90±0.32 mas[2] |
| Distance | approx. Template:Rnd ly (approx. Template:Rnd pc) |
| Absolute magnitude (MV) | −3.74[1] |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | 13.6[6] Template:Solar radius |
| Luminosity | 20,893[7] Template:Solar luminosity |
| Surface gravity (log g) | 2.74[6] cgs |
| Temperature | 23,532[7] K |
| Rotational velocity (v sin i) | 220[7] km/s |
| Age | Script error: No such module "val".[4] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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HD 70930 is a binary star[9] system in the southern constellation of Vela. It has the Bayer designation B Velorum, while HD 70930 is the star's identifier in the Henry Draper catalogue. With a combined apparent visual magnitude of 4.79,[1] it is visible to the naked eye as a faint point of light. The distance to this system is approximately 1,700 light years based on parallax,[2] and it has an absolute magnitude of −3.74.[1] It is drifting further away from the Sun with a radial velocity of about +27 km/s.[1] The system is a member of the Vel OB2 association of co-moving stars.[10]
The double nature of this system was discovered in 1896 by Scottish astronomer Robert T. A. Innes[3] – it is now known to be a double-lined spectroscopic binary.[11] The magnitude 5.14[3] primary component has a blue-white hue and has been assigned stellar classifications of B1V[4] and B2III,[5] matching a B-type main-sequence star or a giant star, respectively. It is a massive object – over 15 times the mass of the Sun – and is around 10 million years old.[4] The star has a high rate of spin, showing a projected rotational velocity of 220 km/s.[7] Its companion, at magnitude +6.08, is located at an angular separation of Script error: No such module "val". along a position angle of 139°, as of 2008.[3]
References
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- ↑ a b c d e f g h Template:Cite XHIP
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