Delta Mensae

Delta Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 04h 17m 59.27258s[1]
Declination −80° 12′ 50.5073″[1]
Apparent magnitude (V) 5.69[2]
Characteristics
Spectral type K2/3 III + A9[3]
U−B color index +0.53[2]
B−V color index +0.84[2]
Astrometry
Radial velocity (Rv)−20.0±4.3[4] km/s
Proper motion (μ) RA: +27.719[1] mas/yr
Dec.: +61.679[1] mas/yr
Parallax (π)6.9662 ± 0.1168 mas[1]
Distance468 ± 8 ly
(144 ± 2 pc)
Absolute magnitude (MV)0.34[5]
Details
δ Men A
Radius13.12+0.52
−0.46[1] R☉
Luminosity111.7±2.2[1] L☉
Temperature5,180+94
−99[1] K
Rotational velocity (v sin i)< 4.7±0.2[5] km/s
Other designations
δ Men, CPD−80° 116, FK5 166, HD 28525, HIP 20049, HR 1426, SAO 258372[6]
Database references
SIMBADdata

Delta Mensae, Latinized from δ Mensae, is a binary star[7] system in the southern constellation of Mensa. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.69.[2] Based upon an annual parallax shift of 7.70 mas as seen from the Earth,[8] it is 420 light years from the Sun.

The primary, designated component A, is a K-type giant star with a stellar classification of K2/3 III.[3] With the supply of hydrogen at its core exhausted, it has cooled and expanded to 13 times the radius of the Sun. The star is radiating 112 times the Sun's luminosity from its photosphere at an effective temperature of 5,180 K.[1] Its companion, component B, is an A-type star about 0.9 magnitudes fainter than the primary.[3]

  1. ^ a b c d e f g h i 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 Parsons1998 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 AmmlerVonEiff2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).