HD 4628
Star in the constellation Pisces
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HD 4628 (96 G. Piscium) is a main sequence star in the equatorial constellation of Pisces. It has a spectral classification of K2.5 V and an effective temperature of 5,055 K, giving it an orange-red hue with a slightly smaller mass and girth than the Sun. HD 4628 lies at a distance of approximately 24.3 light years from the Sun based on parallax.[2] The apparent magnitude of 5.7[3] is just sufficient for this star to be viewed with the unaided eye. The star appears to be slightly older than the Sun—approximately 5.4 billion years in age.[8] The surface activity is low and, based upon the detection of UV emission, it may have a relatively cool corona with a temperature of one million K.[11]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 00h 48m 22.97596s[2] |
| Declination | +05° 16′ 50.2095″[2] |
| Apparent magnitude (V) | 5.74[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K2.5 V[4] |
| U−B color index | +0.60[4] |
| B−V color index | +0.89[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.37±0.12[2] km/s |
| Proper motion (μ) | RA: +755.894 mas/yr[2] Dec.: −1141.019 mas/yr[2] |
| Parallax (π) | 134.4948±0.0578 mas[2] |
| Distance | 24.25 ± 0.01 ly (7.435 ± 0.003 pc) |
| Absolute magnitude (MV) | 6.37[5] |
| Details[6] | |
| Mass | 0.778±0.007 M☉ |
| Radius | 0.762±0.012 R☉ |
| Luminosity | 0.292±0.007 L☉ |
| Surface gravity (log g) | 4.64±0.01 cgs |
| Temperature | 5,093±33 K |
| Metallicity [Fe/H] | −0.26±0.01 dex |
| Rotation | 38.0 days[7] |
| Age | 5.4[8] Gyr |
| Other designations | |
| 96 G. Piscium[9], BD+04°123, GJ 33, HD 4628, HIP 3765, HR 222, SAO 109471, LHS 121, LTT 10285, Wolf 25, Lalande 1299[10] | |
| Database references | |
| SIMBAD | data |
The star has a relatively high proper motion of 1.4″ per year and is moving in our general direction with a radial velocity of −10.4 km/s.[2] HD 4628 will make its closest approach to the Sun in about 32,000 years, when it comes within 20 ly (7.3 pc).[12] No definitive companion has yet been found in orbit around this star. In 1958 it was thought to have stellar companion that was also a flare star, but this was subsequently disproved.[13]