HD 4628
Star in the constellation Pisces / From Wikipedia, the free encyclopedia
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.[1] The apparent magnitude of 5.7[2] 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.[7] 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.[10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pisces |
Right ascension | 00h 48m 22.97596s[1] |
Declination | +05° 16′ 50.2095″[1] |
Apparent magnitude (V) | 5.74[2] |
Characteristics | |
Spectral type | K2.5 V[3] |
U−B color index | +0.60[3] |
B−V color index | +0.89[3] |
Astrometry | |
Radial velocity (Rv) | −10.37±0.12[1] km/s |
Proper motion (μ) | RA: +755.894 mas/yr[1] Dec.: −1141.019 mas/yr[1] |
Parallax (π) | 134.4948 ± 0.0578 mas[1] |
Distance | 24.25 ± 0.01 ly (7.435 ± 0.003 pc) |
Absolute magnitude (MV) | 6.37[4] |
Details[5] | |
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[6] |
Age | 5.4[7] Gyr |
Other designations | |
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.[1] HD 4628 will make its closest approach to the Sun in about 32,000 years, when it comes within 20 ly (7.3 pc).[11] 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.[12]