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 | |
Database references | |
SIMBAD | data |
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]
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]
vanLeeuwen2007
was invoked but never defined (see the help page).TYC2
was invoked but never defined (see the help page).Wu
was invoked but never defined (see the help page).UBV
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).RV
was invoked but never defined (see the help page).AllendePrieto
was invoked but never defined (see the help page).zorec2012
was invoked but never defined (see the help page).David2015
was invoked but never defined (see the help page).Royer2007
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).chini2012
was invoked but never defined (see the help page).vanBelle2012
was invoked but never defined (see the help page).Ishihara2017
was invoked but never defined (see the help page).