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Lambda Mensae

Lambda Mensae
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]
Distance466.7 ± 0.9 ly
(143.1 ± 0.3 pc)
Absolute magnitude (MV)+0.84[7]
Details
Radius10[8] R☉
Luminosity54[9] L☉
Surface gravity (log g)2.43[10] cgs
Temperature4,713[10] K
Other designations
λ Men, CPD−72° 289, HD 39810, HIP 27369, HR 2062, SAO 256239, 2MASS J05474813-7242080[11]
Database references
SIMBADdata

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]

  1. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Laney2012 was invoked but never defined (see the help page).
  6. ^ 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.
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Kordopatis2013 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).
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