HD 25291, also known as HR 1242, is a solitary,[12] yellowish-white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.12,[2] making it one of the brighter members of this generally faint constellation. The object is relatively far at a distant of approximately 2,100 light years[1] but is drifting closer with a heliocentric radial velocity of −20.3 km/s.[5]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 04m 27.16294s[1] |
| Declination | +59° 09′ 19.8327″[1] |
| Apparent magnitude (V) | 5.12[2] |
| Characteristics | |
| Spectral type | F0 II[3] |
| U−B color index | +0.47[2] |
| B−V color index | +0.15[2] |
| Variable type | constant[4] |
| Astrometry | |
| Radial velocity (Rv) | −20.3±0.8[5] km/s |
| Proper motion (μ) | RA: −3.380 mas/yr[1] Dec.: +1.027 mas/yr[1] |
| Parallax (π) | 1.5558 ± 0.1047 mas[1] |
| Distance | 2,100 ± 100 ly (640 ± 40 pc) |
| Absolute magnitude (MV) | −3.91[6] |
| Details | |
| Mass | 8.78±0.65[7] M☉ |
| Radius | 50.1[8] R☉ |
| Luminosity (bolometric) | 9,878[7] L☉ |
| Surface gravity (log g) | 1.87[9] cgs |
| Temperature | 7,425[7] K |
| Metallicity [Fe/H] | −0.07[9] dex |
| Rotational velocity (v sin i) | 6.8±2[10] km/s |
| Age | 32[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 25291 has a general stellar classification of F0 II,[3] which indicates that it is an evolved early F-type bright giant. It has also been given a class of F2 Ia,[13] instead suggesting a slightly cooler and more luminous supergiant. Nevertheless, it has 8.8 times the mass of the Sun[7] but at an age of 32 million years,[9] it has expanded to 50.1 times its girth.[8] It radiates at a bolometric luminosity 9,878 times greather that of the Sun from its enlarged photosphere at an effective temperature of 7,425 K.[7] HD 25291 is slightly metal deficient, with an iron abundance 85% of solar levels.[9] It spins modestly with a projected rotational velocity of 6.8 km/s.[9]
Tetzlaff et al. (2011) found the object to be a runaway star with a peculiar velocity of 25.7+1.9
−4.1 km/s, which is high compared to neighboring stars.[14]