HD 30453
Binary star in the constellation Auriga
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HD 30453 is a binary star[10] system in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 5.86.[3] The system is located at a distance of approximately 331 light years from the Sun based on parallax.[2] It is drifting further away from the Sun with a radial velocity of 16.65 km/s.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 04h 49m 19.0801s[2] |
| Declination | +32° 35′ 17.492″[2] |
| Apparent magnitude (V) | 5.86[3] |
| Characteristics | |
| Spectral type | A8m[4] or Am(A7/F0/F2)[5] |
| Apparent magnitude (G) | 5.79[2] |
| U−B color index | +0.14[3] |
| B−V color index | +0.24[3] |
| Astrometry | |
| Radial velocity (Rv) | 16.654±0.012[6] km/s |
| Proper motion (μ) | RA: +18.459±0.060 mas/yr[2] Dec.: −34.638±0.040 mas/yr[2] |
| Parallax (π) | 9.8483±0.0482 mas[2] |
| Distance | 331 ± 2 ly (101.5 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.23[1] |
| Orbit[6] | |
| Period (P) | 7.0508687±0.0000023 d |
| Semi-major axis (a) | ≥5.7633±0.0016 Gm |
| Eccentricity (e) | 0.0 (adopted) |
| Periastron epoch (T) | 2454673.72440±0.00043 MJD |
| Semi-amplitude (K1) (primary) | 0.442±0.017 km/s |
| Semi-amplitude (K2) (secondary) | 0.283±0.065 km/s |
| Details | |
| Radius | 3.59+0.16 −0.45[7] R☉ |
| Luminosity | 38.2±0.5[7] L☉ |
| Temperature | 7,568+532 −160[7] K |
| Rotational velocity (v sin i) | 16.0±9.7[8] km/s |
| Other designations | |
| BD+32°840, HD 30453, HIP 22407, HR 1528, SAO 57444[9] | |
| Database references | |
| SIMBAD | data |
This is a double-lined spectroscopic binary system with an essentially circular orbit and a period of one week.[6] The primary component is a chemically peculiar star of type CP1,[8] or Am star, with a stellar classification of A8m.[4] Abt and Morrell (1995) classed it as Am(A7/F0/F2),[5] indicating it has the hydrogen lines of an A7 star, the calcium K line of a cooler F0 star, and the metallic lines of an F2 class. It has been mentioned as a potential variable star.[11] The star has 3.6[7] times the girth of the Sun and is radiating 38 times the Sun's luminosity from its photosphere at an effective temperature of 7568 K.[7] It has a moderate rotation rate, with a projected rotational velocity of around 16 km/s.[8]
A third component was detected in 1987 using speckle interferometry at an angular separation of 0.04″.[6]