Global InformationLambda Mensae information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 05h 47m 48.13340s[1] |
| Declination | −72° 42′ 08.0993″[1] |
| Apparent magnitude (V) | 6.53[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| Apparent magnitude (B) | 7.614[4] |
| Apparent magnitude (J) | 4.820[5] |
| Apparent magnitude (H) | 4.163[5] |
| Apparent magnitude (K) | 4.119[5] |
| U−B color index | +0.97[2] |
| B−V color index | +1.08[2] |
| Astrometry | |
| Radial velocity (Rv) | 15.35±0.13[6] km/s |
| Proper motion (μ) | RA: -7.013[6] mas/yr Dec.: +24.451[6] mas/yr |
| Parallax (π) | 6.9890 ± 0.0139 mas[6] |
| Distance | 466.7 ± 0.9 ly (143.1 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.84[7] |
| Details | |
| Radius | 10[8] R☉ |
| Luminosity | 54[9] L☉ |
| Surface gravity (log g) | 2.43[10] cgs |
| Temperature | 4,713[10] K |
| Other designations | |
λ Men, CPD−72° 289, HD 39810, HIP 27369, HR 2062, SAO 256239, 2MASS J05474813-7242080[11] | |
| Database references | |
| SIMBAD | data |
Lambda Mensae, Latinized from λ Mensae, is an orange-hued star in the southern constellation of Mensa. It has an apparent visual magnitude of 6.53,[2] which places it at or near the limit on stars visible to the naked eye. According to the Bortle scale, it requires a dark night from rural skies for this star to be viewed. Though it has the designation Lambda, it is actually the twenty-fourth-brightest star in the constellation and not the eleventh-brightest.
This is an evolved K-type giant star with a stellar classification of K0 III.[3] It is a red clump star, which means it is generating energy through helium fusion at its core.[5] The measured angular diameter is 0.68±0.01 mas.[12] At an estimated distance of the star, this yields a physical size of about 10 times the radius of the Sun.[8] It is radiating 54[9] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,713 K.[10]
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Laney2012was invoked but never defined (see the help page). - ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
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