HD 42936

HD 42936

Location of HD 42936 in the night sky. The star is marked within the red diamond.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 06h 06m 29.84725s[1]
Declination −72° 30′ 45.5674″[1]
Apparent magnitude (V) 9.10[2]
Characteristics
HD 42936A
Evolutionary stage main sequence star
Spectral type K0 IV/V[3]
B−V color index +0.91[4]
HD 42936B
Evolutionary stage main sequence star
Spectral type L[5]
Astrometry
Radial velocity (Rv)35.64±0.49[1] km/s
Proper motion (μ) RA: −0.716 mas/yr[1]
Dec.: −382.755 mas/yr[1]
Parallax (π)21.2496 ± 0.1143 mas[1]
Distance153.5 ± 0.8 ly
(47.1 ± 0.3 pc)
Absolute magnitude (MV)5.78[2]
Orbit[6]
PrimaryHD 42936A
CompanionHD 42936B
Period (P)506.89±0.01 d
Semi-major axis (a)1.139±0.004 AU
Eccentricity (e)0.596±0.001
Inclination (i)63.89±0.78°
Argument of periastron (ω)
(secondary)		158.88+0.03
−0.01°
Semi-amplitude (K1)
(primary)		2.65731+0.00033
−0.00002 km/s
Details[6]
HD 42936A
Mass0.900±0.009 M☉
Radius0.861±0.005 R☉
Luminosity0.510±0.003[7] L☉
Surface gravity (log g)4.266±0.045 cgs
Temperature5,201±20 K
Metallicity [Fe/H]0.147±0.013 dex
Rotation21.8+0.5
−16.5 d[8]
Rotational velocity (v sin i)3.17±0.1 km/s
Age9.6±0.8 Gyr
HD 42936B
Mass91.90±0.85 MJup
Other designations
DMPP-3, CD−72°312, CPD−72°451, GC 7845, HD 42936, HIP 28941, SAO 256269[9]
Database references
SIMBADdata
Exoplanet Archivedata

HD 42936, also known as DMPP-3, is a star located in the southern circumpolar constellation Mensa. With an apparent magnitude of 9.1,[2] it is too faint to be detected with the naked eye but can be seen with a telescope. The star is relatively close at a distance of about 153 light-years (47 parsecs) but is receding with a heliocentric radial velocity of 35.6 km/s.[1]

HD 42936 is an early K-type star with the blended luminosity class of a main sequence star and a subgiant.[3] At present it has 87% the mass of the Sun and 91% the radius of the Sun.[8] The object shines at 51% the luminosity of the Sun[7] from its photosphere at an effective temperature of 5,138 K,[8] which gives it an orangish yellow glow. HD 42936 has iron abundance 151% that of the Sun, meaning it is metal enriched[10] despite an age of 10.9 billion years.[8]

HD 42936 has a very low mass companion star in a close orbit,[8] approaching to 0.498 AU at periastron.[6]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Cousins1962 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Haswell2019 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Stevenson2023 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Barnes2019 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference sb was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Jenkins2008 was invoked but never defined (see the help page).