  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 50m 07.58896s[1] |
| Declination | −10° 38′ 39.5839″[1] |
| Apparent magnitude (V) | 5.172[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F7V[3] |
| U−Bcolor index | +0.009[2] |
| B−Vcolor index | +0.518[2] |
| Astrometry | |
| Radial velocity (Rv) | +8.21±0.12[1] km/s |
| Proper motion (μ) | RA: −228.031[1]mas/yr Dec.: −229.577[1]mas/yr |
| Parallax (π) | 62.8022±0.0951 mas[1] |
| Distance | 51.93 ± 0.08 ly (15.92 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.23[4] |
| Details | |
| Mass | 1.19[5] M☉ |
| Radius | 1.17+0.03 −0.01[6] R☉ |
| Luminosity | 1.852+0.006 −0.007[6] L☉ |
| Surface gravity (log g) | 4.45[5] cgs |
| Temperature | 6,352[5] K |
| Metallicity[Fe/H] | −0.03[5] dex |
| Rotational velocity (v sin i) | 4.3[7] km/s |
| Age | 1.9[5] Gyr |
| Other designations | |
| φ2 Cet,19 Cet,NSV 316,BD−11°153,GJ 37,HD 4813,HIP 3909,HR 235,SAO 147470 | |
| Database references | |
| SIMBAD | data |
Phi2 Ceti,Latinized from φ2 Ceti), is astar located in the equatorialconstellation ofCetus. φ2 Ceti is also known as19 Ceti, andHD 4813. Based uponparallax measurements, it is located about 52 light years away. It has anapparent visual magnitude of +5.19, making it bright enough to be seen with the naked eye. The star is drifting further away with aradial velocity of +8 km/s.[1]
This is an ordinaryF-type main sequence star with astellar classification of F7V. The star is estimated to be 1.9[5] billion years old and is spinning with aprojected rotational velocity of 4.3 km/s.[7] It has 1.2[5] times the mass and 1.17[6] times the radius of the Sun. The star is radiating 1.85[6] times the luminosity of the Sun from itsphotosphere at aneffective temperature of 6,352 K.[5] It is a suspected variable star of unknown type, with a brightness that has been measured ranging from magnitude 5.15 down to 5.24.[8]
