Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Columba |
Right ascension | 05h 53m 06.88101s[2] |
Declination | −33° 48′ 04.9079″[2] |
Apparent magnitude (V) | 4.86[3] |
Characteristics | |
Spectral type | B5 V[4] |
U−B color index | −0.57[3] |
B−V color index | −0.15[3] |
Variable type | Suspected rotating ellipsoidal[5] |
Astrometry | |
Radial velocity (Rv) | +30.0[6] km/s |
Proper motion (μ) | RA: −4.72[2] mas/yr Dec.: +31.32[2] mas/yr |
Parallax (π) | 9.75 ± 0.21 mas[2] |
Distance | 335 ± 7 ly (103 ± 2 pc) |
Absolute magnitude (MV) | −0.17[7] |
Details | |
Mass | 4.0±0.1[4] M☉ |
Radius | 3.4[8] R☉ |
Luminosity | 213[9] L☉ |
Surface gravity (log g) | 4.22[10] cgs |
Temperature | 13,524[9] K |
Metallicity [Fe/H] | −0.06[10] dex |
Rotational velocity (v sin i) | 88[11] km/s |
Age | 56.6±26.1[4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Lambda Columbae, Latinized from λ Columbae, is a probable binary star[13] in the southern constellation of Columba. With an apparent visual magnitude of 4.86,[3] it is faintly visible to the naked eye. The measured annual parallax shift of 9.75 mas[2] yields an estimated distance of roughly 335 light years.
Lambda Columbae has a stellar classification of B5 V,[4] indicating that it is a B-type main sequence star. It is a suspected rotating ellipsoidal variable[14] with a period of 0.64 days and an amplitude of 0.07 magnitude.[15] Confirmation would indicate that this is a close binary system.[5] It has an estimated age of around 57 million years.[4]
In Chinese, 子 (Zǐ), meaning Son, refers to an asterism consisting of λ Columbae and β Columbae.[16] Consequently, λ Columbae itself is known as 子一 (Zǐ yī, English: the First Star of Son.).[17] From this Chinese name, the name Tsze is derived.[18]