HD 31975

HD 31975
Observation data
Epoch J2000      Equinox J2000
Constellation Mensa
Right ascension 04h 53m 05.6446s[1]
Declination −72° 24′ 27.6449″[1]
Apparent magnitude (V) 6.28[2]
Characteristics
Spectral type F9 V Fe−0.5[3]
U−B color index +0.01[4]
B−V color index +0.52[4]
Astrometry
Radial velocity (Rv)26.8 ± 0.3[5] km/s
Proper motion (μ) RA: −46.178[1] mas/yr
Dec.: +270.916[1] mas/yr
Parallax (π)30.8217 ± 0.0217 mas[1]
Distance105.82 ± 0.07 ly
(32.44 ± 0.02 pc)
Absolute magnitude (MV)+3.72[2]
Details
Mass1.13[6] M☉
Radius1.46[6] R☉
Luminosity2.77[6] L☉
Surface gravity (log g)4.16[6] cgs
Temperature6.165[6] K
Metallicity [Fe/H]0.00[7] dex
Rotational velocity (v sin i)6[8] km/s
Age3.5[7] Gyr
Other designations
15 G. Mensae, CD−72°231, CPD−72°332, GC 6031, HD 31975, HIP 22717, HR 1606, SAO 256139, WDS J04531-7225A
Database references
SIMBADdata

HD 31975 (HR 1606) is a star situated in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.28, which is near the threshold of naked eye visibility. It is relatively close at a distance of about 106 light years[1] but is receding with a heliocentric radial velocity of 26.9 km/s.[5]

HD 31975 has a stellar classification of F9 V Fe−0.5, indicating that it is a F-type main-sequence star with a mild under abundance of iron in its atmosphere.[3] At present it has 120% the mass of the Sun and 146% the radius of the Sun.[6] It shines at double the luminosity of the Sun from its photosphere at an effective temperature of 6,165 K,[6] giving it a yellow-white glow. HD 31975 has a similar metallicity to the Sun[7] and at an age of 3.5 billion years[7] it spins slowly with a projected rotational velocity of 6 km/s.[8]

The Washington Double Star Catalog lists a faint M5 companion 16.5" away, which is related to the star.[9]

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference tic was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Nord2004 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).