25 Arietis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 27m 23.38951s |
| Declination | +10° 11′ 53.9679″ |
| Apparent magnitude (V) | 6.445 |
| Characteristics | |
| Spectral type | F5 V |
| B−V color index | 0.450±0.007 |
| Astrometry | |
| Radial velocity (Rv) | −39.54±0.25 km/s |
| Proper motion (μ) | RA: −293.750 mas/yr Dec.: −203.157 mas/yr |
| Parallax (π) | 27.3827±0.0412 mas |
| Distance | 119.1 ± 0.2 ly (36.52 ± 0.05 pc) |
| Absolute magnitude (MV) | +3.60 |
| Details | |
| Mass | 1.20 M☉ |
| Radius | 1.41±0.05 R☉ |
| Luminosity | 2.892+0.006 −0.007 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 Gyr |
| Other designations | |
| BD+09°323, HD 15228, HIP 11427, SAO 110537 | |
| Database references | |
| SIMBAD | data |
25 Arietis is a star in the equatorial constellation of Cetus, near the modern constellation boundary with Aries for which it is named. 25 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.45, placing it near the lower limit of visibility to the naked eye. The distance to this star can be estimated from its annual parallax shift of 27.38 mas, which yields a separation of 119 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −40 km/s, and is predicted to come as close as 102.8 light-years in 259,000 years. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.359″ per year.
This is an ordinary F-type main-sequence star with a stellar classification of F5 V. It is about 1.6 billion years old with an estimated 1.20 times the mass of the Sun and 1.41 times the Sun's radius. The star is radiating 2.9 times the Sun's luminosity from its photosphere at an effective temperature of around 6,336 K.