Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Auriga [1] |
Right ascension | 05h 36m 52.41522s [2] |
Declination | +40° 10′ 56.5783″ [2] |
Apparent magnitude (V) | 6.08 [3] |
Characteristics | |
Spectral type | G3 Ib [4] + B7 V? [5] |
U−B color index | 0.69 [3] |
B−V color index | 1.03 [3] |
Astrometry | |
Radial velocity (Rv) | −12.06±0.03 [5] km/s |
Proper motion (μ) | RA: −2.99±1.03 [6] mas/yr Dec.: −4.56±0.67 [6] mas/yr |
Parallax (π) | 1.9414±0.0574 mas [2] |
Distance | 1,680 ± 50 ly (520 ± 20 pc) |
Absolute magnitude (MV) | −2.79 [7] |
Orbit [5] | |
Period (P) | 7829.3±1.4 days |
Eccentricity (e) | 0.8867±0.0006 |
Periastron epoch (T) | 54417.21±0.22 |
Argument of periastron (ω) (secondary) | 250.61±0.20° |
Semi-amplitude (K1) (primary) | 21.77±0.04 km/s |
Details | |
Radius | 45.78+2.89 −3.69 [2] R☉ |
Luminosity | 1,094±43 [2] L☉ |
Surface gravity (log g) | 1.78 [8] cgs |
Temperature | 4,907+210 −149 [2] K |
Metallicity [Fe/H] | +0.04 [8] dex |
Rotational velocity (v sin i) | 6.2 [9] km/s |
Other designations | |
BD+40°1346, HD 36891, HIP 26363, SAO 40481 | |
Database references | |
SIMBAD | data |
HR 1884 is a spectroscopic binary star in the constellation Auriga. The primary is a G type supergiant star while the secondary is probably a B type main sequence star. [5]
The possible spectroscopic binary nature of the star was first noted in 1983 by Gilbert Burki and Michel Mayor in a paper on the rate of binaries among supergiant stars. [10] In the same year, William P. Bidelman noted that the stellar spectrum was composite indicating a companion star. [11] Confirmation of spectroscopic binary status and a preliminary orbit was published in 1998 by R. Paul Butler, [12] a much more accurate orbit was published in 2015 by Roger Griffin. [5]