Zeta Mensae

Zeta Mensae
Location of ζ Mensae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 06h 40m 02.89197s[1]
Declination −80° 48′ 48.9391″[1]
Apparent magnitude (V) +5.64[2]
Characteristics
Spectral type A5 III[3][4]
U−B color index +0.15[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv)+7.0±7.4[5] km/s
Proper motion (μ) RA: −4.801[1] mas/yr
Dec.: +53.158[1] mas/yr
Parallax (π)8.2879 ± 0.0870 mas[1]
Distance394 ± 4 ly
(121 ± 1 pc)
Absolute magnitude (MV)+0.09[6]
Details
Radius4.65±0.27[1] R☉
Luminosity66.39±0.86[1] L☉
Temperature7,555±43[4] K
Rotational velocity (v sin i)200[7] km/s
Other designations
ζ Men, CPD−80° 196, FK5 264, HD 50506, HIP 31897, HR 2559, SAO 258451[8]
Database references
SIMBADdata

Zeta Mensae, Latinized from ζ Mensae, is a solitary,[9] white-hued star in the southern constellation of Mensa. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.64.[2] Based upon an annual parallax shift of 8.2879 mas as seen from GAIA, it is located around 394 light years from the Sun.[1] At that distance, the visual magnitude is diminished by an extinction factor of 0.088 due to interstellar dust.[4] Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster.[10]

The stellar classification of A5 III[3] suggests this is an A-type giant star. It is spinning rapidly, showing a projected rotational velocity of 200 km/s,[7] giving the star an oblate shape with an equatorial bulge that is an estimated 26% larger than the polar radius.[3] The star is radiating about 69[11] times the Sun's luminosity from its photosphere at an effective temperature of around 7,555 K.[4] It displays a faint infrared excess at a wavelength of 18μm, indicating that it is being orbited by a debris disk.[12]

  1. ^ a b c d e f g h 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 c Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference aaa458_1_293 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Levato1972 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggen1995 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Ishihara2017 was invoked but never defined (see the help page).