3 Ceti
Star in the constellation Cetus
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3 Ceti is a single,[11] orange-hued star located around 2,100 light years away[12] in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.95.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −42 km/s.[5] It has a peculiar velocity of 60.7+3.8
−6.2 km/s and is a candidate runaway star.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 04m 30.11827s[1] |
| Declination | −10° 30′ 34.2849″[1] |
| Apparent magnitude (V) | 4.953[2] |
| Characteristics | |
| Spectral type | K3 III[3] or K3 Ib[4] |
| B−V color index | +1.66[2] |
| Astrometry | |
| Radial velocity (Rv) | −42.10±0.33[5] km/s |
| Proper motion (μ) | RA: −6.85[1] mas/yr Dec.: −12.02[1] mas/yr |
| Parallax (π) | 1.56±0.31 mas[1] |
| Distance | approx. 2,100 ly (approx. 600 pc) |
| Details | |
| Mass | 9.0±0.6[6] M☉ |
| Radius | 182[7] R☉ |
| Luminosity (bolometric) | 7,877[7] L☉ |
| Surface gravity (log g) | 0.90[8] cgs |
| Temperature | 4,152[8] K |
| Metallicity [Fe/H] | 0.08[8] dex |
| Rotational velocity (v sin i) | 5.8±1.0[9] km/s |
| Age | 29.7±3.6[6] Myr |
| Other designations | |
| 3 Cet, NSV 13, BD−11°6194, FK5 2001, HD 225212, HIP 355, HR 9103, SAO 147066, 2MASS J00043012-1030344[10] | |
| Database references | |
| SIMBAD | data |
This is a red supergiant star with a stellar classification of K3 Ib,[4] although Houk and Swift (1999) classed it as a normal giant at K3 III.[3] It displays microvariability, undergoing changes in brightness with a frequency of 11.2 times per day and an amplitude of 0.0053 in magnitude.[4] The star is about 30 million years old with nine times the mass of the Sun[6] and 182 times the radius of the Sun. It is radiating 7,877[7] times the Sun's luminosity from its photosphere at an effective temperature of 4,152 K.[8]