Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cetus |
Right ascension | 01h 42m 43.51077s[1] |
Declination | –03° 41′ 24.7210″[1] |
Apparent magnitude (V) | 4.98[2] |
Characteristics | |
Spectral type | K2/3 III CN II[3] |
B−V color index | 1.378±0.003[2] |
Astrometry | |
Radial velocity (Rv) | −33.28±0.15[1] km/s |
Proper motion (μ) | RA: −8.989[1] mas/yr Dec.: −33.238[1] mas/yr |
Parallax (π) | 2.9564 ± 0.1730 mas[1] |
Distance | 1,100 ± 60 ly (340 ± 20 pc) |
Absolute magnitude (MV) | −2.82[2] |
Details | |
Radius | 77[4] R☉ |
Luminosity | 2,537.45[2] L☉ |
Surface gravity (log g) | 1.83[5] cgs |
Temperature | 4,110[5] K |
Metallicity [Fe/H] | −0.12[5] dex |
Rotational velocity (v sin i) | 10[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 10550 is a single[8] star in the equatorial constellation of Cetus. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.98.[2] Based upon an annual parallax shift of 2.9564 mas,[1] it is located around 1,100 light years from the Sun. The star is moving closer with a heliocentric radial velocity of −33 km/s.[1] It has a high peculiar velocity of 72.7+5.7
−4.3 km/s and may be a runaway star.[9]
The stellar classification of this star is K2/3 III CN II,[3] showing the spectrum of an evolved K-type giant star with an overabundance of CN in the atmosphere. The measured angular diameter of this star, after correction for limb darkening, is 2.11±0.04 mas.[10] At the estimated distance of this star, this yields a physical size of about 77 times the radius of the Sun.[4] The star is radiating around 2,537[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,110 K.[5]