HD 21447
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h 30m 00.18302s |
| Declination | +55° 27′ 06.5158″ |
| Apparent magnitude (V) | 5.09 |
| Characteristics | |
| Spectral type | A1 Va |
| B−V color index | 0.022±0.015 |
| Astrometry | |
| Radial velocity (Rv) | −1.9±0.9 km/s |
| Proper motion (μ) | RA: −46.08 mas/yr Dec.: −11.07 mas/yr |
| Parallax (π) | 16.42±0.29 mas |
| Distance | 199 ± 4 ly (61 ± 1 pc) |
| Absolute magnitude (MV) | 1.17 |
| Details | |
| Mass | 2.32 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 32.16 L☉ |
| Surface gravity (log g) | 4.06 cgs |
| Temperature | 10,049±342 K |
| Rotational velocity (v sin i) | 182 km/s |
| Age | 146 Myr |
| Other designations | |
| NSV 1159, BD+54°684, HD 21447, HIP 16292, HR 1046, SAO 24064, WDS J03300+5527A | |
| Database references | |
| SIMBAD | data |
HD 21447 is a probable binary star 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. Based upon an annual parallax shift of 16.42±0.29 mas, it is located some 199 light years from the Sun. It is a candidate for membership in the Ursa Major Moving Group.
The primary component is A-type main-sequence star with a stellar classification of A1 Va. It is around 146 million years old and is spinning with a projected rotational velocity of 182 km/s. The star has an estimated 2.32 times the mass of the Sun and about 1.9 times the Sun's radius. It is radiating around 32 times the Sun's luminosity from its photosphere at an effective temperature of 10,049 K. The companion is visual magnitude 9.4 star at an angular separation of 14.8″.