| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00 03 44.38784 |
| Declination | −17° 20′ 09.5719″ |
| Apparent magnitude (V) | 4.483 |
| Characteristics | |
| Spectral type | B9 IVn |
| U−B color index | −0.12 |
| B−V color index | −0.047±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +8.0±4.6 km/s |
| Proper motion (μ) | RA: +25.17 mas/yr Dec.: −9.16 mas/yr |
| Parallax (π) | 11.98 ± 0.26 mas |
| Distance | 272 ± 6 ly (83 ± 2 pc) |
| Absolute magnitude (MV) | −0.06 |
| Details | |
| Mass | 2.68±0.11 M☉ |
| Radius | 2.75 R☉ |
| Luminosity | 119+6 −5 L☉ |
| Surface gravity (log g) | 3.99±0.09 cgs |
| Temperature | 11,419±388 K |
| Metallicity | +0.00±0.24 dex |
| Rotational velocity (v sin i) | 116 or 237 km/s |
| Age | 217 Myr |
| Other designations | |
| 2 Cet, BD−18° 6417, FK5 905, HD 225132, HIP 301, HR 9098, SAO 147059 | |
| Database references | |
| SIMBAD | data |
2 Ceti is a single star in the equatorial constellation of Cetus, near the border with Aquarius. It is visible to the naked eye with an apparent visual magnitude of 4.483. The distance to 2 Ceti can be estimated from its annual parallax shift of 12.0 mas, which yields a value of around 272 light years. It appears to be moving further from the Earth with a heliocentric radial velocity of about +8 km/s.
The stellar classification for this star is B9 IVn, matching a B-type subgiant star with "nebulous" absorption lines due to rapid rotation. Estimates of the rotation rate range from 116 to 237 km/s, and this high rate of spin is giving the star an equatorial bulge that is 12% larger than the polar radius. 2 Ceti is about 217 million years old with 2.7 times the mass of the Sun and 2.75 times the Sun's radius. It is radiating 119 times the Sun's luminosity from its photosphere at an effective temperature of 11,419 K. An infrared excess has been detected around this star by the Akari satellite at a wavelength of 18μm, suggesting there is an orbiting debris disk.
References
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- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ Royer, F.; et al. (2007). "Rotational velocities of A-type stars". Astronomy and Astrophysics. 463 (2): 671. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. S2CID 18475298.
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- ^ van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. S2CID 119273474.
- Ishihara, Daisuke; et al. (May 2017). "Faint warm debris disks around nearby bright stars explored by AKARI and IRSF". Astronomy & Astrophysics. 601: 18. arXiv:1608.04480. Bibcode:2017A&A...601A..72I. doi:10.1051/0004-6361/201526215. S2CID 55234482. A72.
