| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis [1] |
| Right ascension | 10h 31m 04.7079s [2] |
| Declination | +82° 33′ 31.146″ [2] |
| Apparent magnitude (V) | 5.252±0.009 [3] |
| Characteristics | |
| Evolutionary stage | main sequence [4] |
| Spectral type | F4 V kF2 mF2 [5] |
| U−B color index | −0.05 [6] |
| B−V color index | +0.37 [6] |
| Astrometry | |
| Radial velocity (Rv) | +7.9±0.9 [7] km/s |
| Proper motion (μ) | RA: −86.133 [2] mas/yr Dec.: +19.832 [2] mas/yr |
| Parallax (π) | 43.4367±0.5983 mas [2] |
| Distance | 75 ± 1 ly (23.0 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.60 [8] |
| Details | |
| Mass | 1.29 [9] M☉ |
| Radius | 1.40+0.03 −0.06 [10] R☉ |
| Luminosity | 3.36±0.02 [10] L☉ |
| Surface gravity (log g) | 4.43±0.14 [9] cgs |
| Temperature | 6,602+159 −69 [10] K |
| Metallicity [Fe/H] | −0.26 [3] dex |
| Rotational velocity (v sin i) | 56.2 [3] km/s |
| Age | 1.074 [9] Gyr |
| Other designations | |
| BD+83°297, FK5 911, GJ 392.1, HD 90089, HIP 51502, HR 4084, SAO 1714, WDS J10311+8234A | |
| Database references | |
| SIMBAD | data |
HD 90089 (HR 4084; Gliese 392.1) is a star located in the northern circumpolar constellation Camelopardalis. With an apparent magnitude of 5.25, [3] it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 75 light years, [10] but is drifting away at a rate of almost 8 km/s. [7]
HD 90089 is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star. [5] Although the spectral type is of a form that would indicate an Am star, it is not listed in any of the major catalogues of chemically peculiar stars. [11] At present it has 1.29 times the mass of the Sun [9] and 1.4 times its radius. It radiates at 3.36 times the luminosity of the Sun from its photosphere at an effective temperature of 6,602 K , [10] which gives it a yellowish-white hue.
HD 90089's exact age depends on the method, with its X-ray luminosity giving it a young age of only 300 million years. [3] David et al. gave it an age of 1.1 billion years, [9] significantly older than the previous solution; it spins rapidly with a projected rotational velocity of 56.2 km/s, [3] and has an M0 companion separated 13" away [12] and at approximately the same distance. [13]
An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 145 AU. The temperature of this dust is 30 K. [3]
