2 Ceti

2 Ceti is a single^[12] 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.^[2] The distance to 2 Ceti can be estimated from its annual parallax shift of 12.0 mas,^[1] 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.^[6]

2 Ceti

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	00h 03m 44.38784s[1]
Declination	−17° 20′ 09.5719″[1]
Apparent magnitude (V)	4.483[2]
Characteristics
Spectral type	B9 IVn[3]
U−B color index	−0.12[4]
B−V color index	−0.047±0.003[5]
Astrometry
Radial velocity (Rv)	+8.0±4.6[6] km/s
Proper motion (μ)	RA: +25.17[1] mas/yr Dec.: −9.16[1] mas/yr
Parallax (π)	11.98±0.26 mas[1]
Distance	272 ± 6 ly (83 ± 2 pc)
Absolute magnitude (MV)	−0.06[5]
Details
Mass	2.68±0.11[7] M☉
Radius	2.75[7] R☉
Luminosity	119+6 −5[8] L☉
Surface gravity (log g)	3.99±0.09[7] cgs
Temperature	11,419±388[9] K
Metallicity [Fe/H]	+0.00±0.24[3] dex
Rotational velocity (v sin i)	116[8] or 237[10] km/s
Age	217[9] Myr
Other designations
2 Cet, BD−18°6417, FK5 905, HD 225132, HIP 301, HR 9098, SAO 147059[11]
Database references
SIMBAD	data

The stellar classification for this star is B9 IVn,^[3] matching a B-type subgiant star with "nebulous" absorption lines due to rapid rotation.^[13] Estimates of the rotation rate range from 116^[8] to 237^[10] km/s, and this high rate of spin is giving the star an equatorial bulge that is 12% larger than the polar radius.^[13] 2 Ceti is about 217^[9] million years old with 2.7^[7] times the mass of the Sun and 2.75^[7] times the Sun's radius. It is radiating 119^[8] times the Sun's luminosity from its photosphere at an effective temperature of 11,419 K.^[9] 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.^[14]