Mu Mensae

Mu Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 04h 43m 03.96306s[1]
Declination −70° 55′ 51.7147″[1]
Apparent magnitude (V) 5.54[2]
Characteristics
Spectral type B8 II-III(p Si)[3]
U−B color index −0.46[2]
B−V color index −0.12[2]
Astrometry
Radial velocity (Rv)−0.2±3.9[4] km/s
Proper motion (μ) RA: +9.32[5] mas/yr
Dec.: +34.93[5] mas/yr
Parallax (π)6.8405 ± 0.0750 mas[6]
Distance477 ± 5 ly
(146 ± 2 pc)
Absolute magnitude (MV)0.02[7]
Details
Radius3.3[8] R☉
Luminosity216[9] L☉
Temperature12,550[9] K
Rotation5.1918[10] d
Rotational velocity (v sin i)30[11] km/s
Age226[7] Myr
Other designations
μ Men, CPD−71° 282, HD 30612, HIP 21949, HR 1541, SAO 256122[12]
Database references
SIMBADdata

μ Mensae, Latinized as Mu Mensae, is a solitary,[13] blue-white-hued star in the southern constellation of Mensa. With an apparent visual magnitude of 5.54,[2] it is just bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 6.8405 mas as seen from GAIA, this star is located roughly 477 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.09 due to interstellar dust.[7]

The stellar classification of B8 II-III(p Si)[3] suggests that it is a B-type star with a spectrum that shows mixed traits of a giant and a bright giant star. It may be chemically peculiar with an overabundance of silicon in its outer atmosphere.[11] The estimated radius of the star is 3.3 times that of the Sun.[8] It is radiating 216 times the Sun's luminosity from its photosphere at an effective temperature of 12,550 K.[9]

  1. ^ a b Cite error: The named reference GaiaDR2 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 deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Barraza was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Levato1996 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).