Global InformationLambda Crateris information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 23m 21.88432s[1] |
| Declination | −18° 46′ 47.8910″[1] |
| Apparent magnitude (V) | 5.08[2] |
| Characteristics | |
| Spectral type | F5 III[3] |
| U−B color index | −0.04[2] |
| B−V color index | +0.43[2] |
| Astrometry | |
| Radial velocity (Rv) | +13.26±0.60[4] km/s |
| Proper motion (μ) | RA: −305.37[1] mas/yr Dec.: +27.56[1] mas/yr |
| Parallax (π) | 23.32 ± 0.80 mas[1] |
| Distance | 140 ± 5 ly (43 ± 1 pc) |
| Absolute magnitude (MV) | +1.92[5] |
| Orbit[6] | |
| Period (P) | 1,940±84 d[7] |
| Eccentricity (e) | 0.54 |
| Periastron epoch (T) | 32722 |
| Argument of periastron (ω) (secondary) | 140.7° |
| Semi-amplitude (K1) (primary) | 2.5 km/s |
| Details | |
| Mass | 1.78[8] M☉ |
| Radius | 2.8[9] R☉ |
| Luminosity | 14.4[5] L☉ |
| Surface gravity (log g) | 4.06±0.11[4] cgs |
| Temperature | 6,582±54[4] K |
| Metallicity [Fe/H] | −0.15±0.01[4] dex |
| Rotational velocity (v sin i) | 17.0[10] km/s |
| Other designations | |
λ Crt, 13 Crateris, BD−17° 3367, HD 98991, HIP 55598, HR 4395, SAO 156646.[11] | |
| Database references | |
| SIMBAD | data |
Lambda Crateris, Latinized from λ Crateris, is the Bayer designation for a suspected binary star[12] system in the southern constellation of Crater. With an annual parallax shift of 23.32[1] milliarcsecond as observed from Earth, it is located around 140 light years from the Sun. It is faintly visible to the naked eye with an apparent visual magnitude of 5.08.[2]
This is a probable astrometric binary[12] star system, with orbital elements first reported by Abt and Levy (1976). However, Morbey and Griffin (1987) later cast some doubt on the validity of these results, suggesting that further review is needed.[13] The visible member of this system, component A, is an evolved F-type giant star[10] with a stellar classification of F5 III.[3] It has an estimated 1.78[8] times the mass of the Sun and 2.8[9] times the Sun's radius. The star is spinning with a projected rotational velocity of 17[10] km/s.
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