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Binary star system in the constellation Lepus From Wikipedia, the free encyclopedia
HD 34968 is a binary star[2] system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69[2] 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,[5] having come within 118.6 ly some 3,686,000 years ago.[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lepus |
Right ascension | 05h 20m 26.91498s[1] |
Declination | −21° 14′ 23.1367″[1] |
Apparent magnitude (V) | 4.69 (4.73 + 8.45)[2] |
Characteristics | |
Spectral type | A0 V[3] |
B−V color index | −0.048±0.003[4] |
Astrometry | |
Radial velocity (Rv) | 30.9±0.5[5] km/s |
Proper motion (μ) | RA: +17.149[1] mas/yr Dec.: −9.382[1] mas/yr |
Parallax (π) | 8.7188 ± 0.1661 mas[1] |
Distance | 374 ± 7 ly (115 ± 2 pc) |
Absolute magnitude (MV) | −0.82[4] |
Details | |
HD 34968 A | |
Mass | 3.34±0.06[6] M☉ |
Radius | 2.0[7] R☉ |
Luminosity | 245+38 −33[6] L☉ |
Temperature | 10,046+70 −69[6] K |
Rotational velocity (v sin i) | 84[6] km/s |
Other designations | |
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,[3] 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,[6] with 3.34[6] times the mass of the Sun and 2.0[7] times the Sun's radius. The star is spinning with a projected rotational velocity of 84 km/s.[6] It is radiating 245[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,046 [6]
The fainter secondary, component B, is a magnitude 8.45[2] star at an angular separation of 4.1″ along a position angle of 279°, as of 2008.[10]