HD 34968
Binary star system in the constellation Lepus
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HD 34968 is a binary star[3] system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69[3] is bright enough to be visible to the naked eye. The distance to HD 34968 can be estimated from its annual parallax shift of 8.7 mas, yielding a range of 374 light years. It is moving further away from the Earth with a heliocentric radial velocity of 31 km/s,[6] having come within 118.6 ly some 3,686,000 years ago.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus[1] |
| Right ascension | 05h 20m 26.91498s[2] |
| Declination | −21° 14′ 23.1367″[2] |
| Apparent magnitude (V) | 4.69 (4.73 + 8.45)[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A0 V[5] |
| B−V color index | −0.048±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | 30.9±0.5[6] km/s |
| Proper motion (μ) | RA: +17.149[2] mas/yr Dec.: −9.382[2] mas/yr |
| Parallax (π) | 8.7188±0.1661 mas[2] |
| Distance | 374 ± 7 ly (115 ± 2 pc) |
| Absolute magnitude (MV) | −0.82[1] |
| Details | |
| HD 34968 A | |
| Mass | 2.6[7] M☉ |
| Radius | 4.4[7] R☉ |
| Luminosity | 177[7] L☉ |
| Surface gravity (log g) | 3.56[7] cgs |
| Temperature | 10,046[7] K |
| Rotational velocity (v sin i) | 84[4] km/s |
| Other designations | |
| BD−21°1135, HD 34968, HIP 24927, HR 1762, SAO 170327, WDS J05204-2114A[8] | |
| Database references | |
| SIMBAD | data |
The primary member, component A, is a magnitude 4.73 star. Houk and Smith-Moore (1978) gave this object a stellar classification of A0 V,[5] indicating it is an ordinary A-type main-sequence star. Gray and Garrison (1987) classified it as B9.5 III and noted that the spectrum is slightly variable.[9] It is 99.2%±2.6% of the way through its main sequence lifetime,[4] with 2.6 times the mass of the Sun and 4.4 times the Sun's radius.[7] The star is spinning with a projected rotational velocity of 84 km/s.[4] It is radiating 177 times the Sun's luminosity from its photosphere at an effective temperature of 10,046 K.[7]
The fainter secondary, component B, is a magnitude 8.45[3] star at an angular separation of 4.1″ along a position angle of 279°, as of 2008.[10]