| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h30m 00.18302s[1] |
| Declination | +55° 27′ 06.5158″[1] |
| Apparent magnitude (V) | 5.09[2] |
| Characteristics | |
| Spectral type | A1 Va[3] |
| B−V color index | 0.022±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.9±0.9[4] km/s |
| Proper motion (μ) | RA: −46.08[1] mas/yr Dec.: −11.07[1] mas/yr |
| Parallax (π) | 16.42 ± 0.29 mas[1] |
| Distance | 199 ± 4 ly (61 ± 1 pc) |
| Absolute magnitude (MV) | 1.17[2] |
| Details | |
| Mass | 2.32[5] M☉ |
| Radius | 1.9[6] R☉ |
| Luminosity | 32.16[2] L☉ |
| Surface gravity (log g) | 4.06[7] cgs |
| Temperature | 10,049±342[7] K |
| Rotational velocity (v sin i) | 182[7] km/s |
| Age | 146[7] Myr |
| Other designations | |
NSV 1159, BD+54°684, HD 21447, HIP 16292, HR 1046, SAO 24064, WDS J03300+5527A[8] | |
| Database references | |
| SIMBAD | data |
HD 21447 is a probable binary star[9] system located in the constellation Camelopardalis. The star is also known as HR 1046. It can be viewed with the naked eye, having an apparent visual magnitude of 5.09.[2] Based upon an annual parallax shiftof16.42±0.29 mas,[1] it is located some 199 light years from the Sun. It is a candidate for membership in the Ursa Major Moving Group.[10]
The primary component is A-type main-sequence star with a stellar classification of A1 Va.[3] It is around 146[7] million years old and is spinning with a projected rotational velocity of 182 km/s.[7] The star has an estimated 2.32[5] times the mass of the Sun and about 1.9[6] times the Sun's radius. It is radiating around 32[2] times the Sun's luminosity from its photosphere at an effective temperature of 10,049 K.[7] The companion is visual magnitude 9.4 star at an angular separationof14.8″.[9]
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