Eta Mensae

Eta Mensae
Location of η Mensae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 04h 55m 11.20309s[1]
Declination −74° 56′ 12.6705″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Spectral type K4 III[3][4]
U−B color index +1.82[2]
B−V color index +1.52[2]
Astrometry
Proper motion (μ) RA: +28.27[1] mas/yr
Dec.: +61.52[1] mas/yr
Parallax (π)5.0299 ± 0.0998 mas[5]
Distance650 ± 10 ly
(199 ± 4 pc)
Absolute magnitude (MV)−1.08[6]
Details
Luminosity616[7] L☉
Surface gravity (log g)1.15[8] cgs
Temperature4,055[7] K
Metallicity [Fe/H]−0.17[8] dex
Other designations
η Men, CPD−75° 290, FK5 1138, HD 32440, HIP 22871, HR 1629, SAO 256145[9]
Database references
SIMBADdata

Eta Mensae, Latinized from η Mensae, is the Bayer designation for a solitary,[4] orange-hued star in the southern constellation of Mensa. This object has an apparent visual magnitude of 5.47,[2] which is sufficiently luminous to be faintly visible to the naked eye. Based upon an annual parallax shift of 4.88 mas as seen from Earth,[1] this star is located roughly 670 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K4 III.[3] It is radiating 616 times the Sun's luminosity from its photosphere at an effective temperature of 4,055 K.[7] The star displays an infrared excess that suggests the presence of circumstellar dust.[10][11] Eta Mensae is a probable member of the stream of stars associated with the Hyades cluster.[12]

  1. ^ a b c d e 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. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  5. ^ 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.
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Kim2001 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Zuckerman1995 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference eggen1996 was invoked but never defined (see the help page).