| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 02h 27m 23.38951s[2] |
| Declination | +10° 11′ 53.9679″[2] |
| Apparent magnitude (V) | 6.445[3] |
| Characteristics | |
| Spectral type | F5 V[4] |
| B−Vcolor index | 0.450±0.007[1] |
| Astrometry | |
| Radial velocity (Rv) | −39.54±0.25[2] km/s |
| Proper motion (μ) | RA: −293.750[2]mas/yr Dec.: −203.157[2]mas/yr |
| Parallax (π) | 27.3827±0.0412 mas[2] |
| Distance | 119.1 ± 0.2 ly (36.52 ± 0.05 pc) |
| Absolute magnitude (MV) | +3.60[1] |
| Details[3] | |
| Mass | 1.20 M☉ |
| Radius | 1.41±0.05 R☉ |
| Luminosity | 2.892+0.006 −0.007[2] L☉ |
| Surface gravity (log g) | 4.22±0.10 cgs |
| Temperature | 6,336±80 K |
| Metallicity[Fe/H] | −0.20±0.07 dex |
| Age | 1.598[5] Gyr |
| Other designations | |
| BD+09°323,HD 15228,HIP 11427,SAO 110537[6] | |
| Database references | |
| SIMBAD | data |
25 Arietis is astar in theequatorialconstellation ofCetus, near the modern constellation boundary withAries for which it is named.25 Arietis is theFlamsteed designation. It has anapparent visual magnitude of 6.45,[1] placing it near the lower limit of visibility to the naked eye. The distance to this star can be estimated from its annualparallax shift of27.38 mas,[2] which yields a separation of 119 light years. The star is moving closer to the Earth with a heliocentricradial velocity of −40 km/s,[2] and is predicted to come as close as 102.8 light-years in 259,000 years.[1] It has a relatively highproper motion, traversing thecelestial sphere at the rate of0.359″ per year.[7]
This is an ordinaryF-type main-sequence star with astellar classification of F5 V.[4] It is about 1.6 billion years old[5] with an estimated 1.20 times themass of the Sun and 1.41 times theSun's radius.[3] The star is radiating 2.9 times theSun's luminosity from itsphotosphere[2] at aneffective temperature of around 6,336 K.[3]
