54 Ceti
Star in the constellation Aries
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54 Ceti is an older Flamsteed designation[10] for a star that is now located within the constellation boundaries of Aries,[11] the Ram. In the present day it is known by star catalogue identifiers like HD 11257 or HR 534.[9] At an apparent visual magnitude of 5.94,[3] it can be seen with the naked eye. The distance to this star, as determined using parallax measurements made during the Hipparcos mission, is approximately 139 light-years (43 parsecs), give or take a 6 light-year margin of error.[12] It is located near the ecliptic and hence is subject to occasional occultation by the Moon.[13]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 01h 50m 51.97261s[2] |
| Declination | +11° 02′ 36.1620″[2] |
| Apparent magnitude (V) | 5.94[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F2 Vw[4] |
| U−B color index | −0.03[3] |
| B−V color index | +0.30[3] |
| R−I color index | 0.17 |
| Astrometry | |
| Radial velocity (Rv) | +11.1[5] km/s |
| Proper motion (μ) | RA: −69.516[2] mas/yr Dec.: −27.5520[2] mas/yr |
| Parallax (π) | 24.0374±0.0512 mas[2] |
| Distance | 135.7 ± 0.3 ly (41.60 ± 0.09 pc) |
| Absolute magnitude (MV) | 2.80[1] |
| Details | |
| Mass | 1.48[6] M☉ |
| Radius | 1.62+0.08 −0.05[7] R☉ |
| Luminosity | 6.01±0.03[7] L☉ |
| Surface gravity (log g) | 4.50[4] cgs |
| Temperature | 7,099[4] K |
| Metallicity [Fe/H] | −0.20[4] dex |
| Rotational velocity (v sin i) | 29[8] km/s |
| Age | 582[6] Myr |
| Other designations | |
| 54 Cet, NSV 635, BD+10°252, HD 11257, HIP 8588, HR 534, SAO 92659[9] | |
| Database references | |
| SIMBAD | data |
This is an F-type main sequence star with a stellar classification of F2 Vw,[4] where the 'w' indicates weak absorption lines in the spectrum. The star is around 582[6] million years old with a projected rotational velocity of 29 km/s.[8] It has 1.5[6] times the mass of the Sun and 1.6[7] times the Sun's radius. The star is radiating six[7] times the luminosity of the Sun from its photosphere at an effective temperature of 7,099 K.[4] It is a candidate member of the Ursa Major Moving Group, which has an estimated age of 500 ± 100 million years.[14]