54 Ceti is an older Flamsteed designation[9] for a star that is now located within the constellation boundaries of Aries,[10] the Ram. In the present day it is known by star catalogue identifiers like HD 11257 or HR 534.[8] At an apparent visual magnitude of 5.94,[2] 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.[11] It is located near the ecliptic and hence is subject to occasional occultation by the Moon.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 01h 50m 51.97256s[1] |
Declination | +11° 02′ 36.1621″[1] |
Apparent magnitude (V) | 5.94[2] |
Characteristics | |
Spectral type | F2 Vw[3] |
U−B color index | –0.03[2] |
B−V color index | +0.30[2] |
R−I color index | 0.17 |
Astrometry | |
Radial velocity (Rv) | +11.1[4] km/s |
Proper motion (μ) | RA: –69.464[1] mas/yr Dec.: –27.522[1] mas/yr |
Parallax (π) | 23.7942 ± 0.1026 mas[1] |
Distance | 137.1 ± 0.6 ly (42.0 ± 0.2 pc) |
Absolute magnitude (MV) | 2.80[5] |
Details | |
Mass | 1.48[6] M☉ |
Radius | 1.62+0.08 −0.05[1] R☉ |
Luminosity | 6.01±0.03[1] L☉ |
Surface gravity (log g) | 4.50[3] cgs |
Temperature | 7,099[3] K |
Metallicity [Fe/H] | –0.20[3] dex |
Rotational velocity (v sin i) | 29[7] km/s |
Age | 582[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an F-type main sequence star with a stellar classification of F2 Vw,[3] 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.[7] It has 1.5[6] times the mass of the Sun and 1.6[1] times the Sun's radius. The star is radiating six[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,099 K.[3] It is a candidate member of the Ursa Major Moving Group, which has an estimated age of 500 ± 100 million years.[13]
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