HD 42936

HD 42936 is a binary star composed of an orange (K-type) main-sequence star and an L-type dwarf star just massive enough to burn hydrogen, located approximately 153 light-years away in the constellation of Mensa, taking its primary name from its Henry Draper Catalogue designation.

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 29.8496258601s[1]
Declination −72° 30′ 45.554148585″[1]
Apparent magnitude (V) 9.09[1]
Characteristics
HD 42936A
Evolutionary stage main sequence star
Spectral type K0IV/V[1]
B−V color index 0.91[1]
HD 42936B
Evolutionary stage main sequence star
Spectral type L[2]
Astrometry
Radial velocity (Rv)+34.08 ± 0.77[1] km/s
Proper motion (μ) RA: -1.412 [1] mas/yr
Dec.: -383.637 [1] mas/yr
Parallax (π)21.2977 ± 0.1032[1] mas
Distance153.1 ± 0.7 ly
(47.0 ± 0.2 pc)
Absolute magnitude (MV)5.73
Details
HD 42936A
Mass0.87 M☉
Radius0.91 R☉
Luminosity (visual, LV)0.43 L☉
Surface gravity (log g)4.3 cgs
Temperature5138 K
Metallicity [Fe/H]0.18 dex
Age10.9 Gyr
HD 42936B
Mass79.9 MJup
Age10.9 Gyr
Other designations
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

History and nomenclature

The designation HD 42936 is from the Henry Draper Catalogue, which is based on spectral classifications made between 1911 and 1915 by Annie Jump Cannon and her co-workers, and was published between 1918 and 1924.

Characteristics

As a primary component of HD 42936 is K-type star, HD 42936 emits orange-tinted light.

Planetary system

In 2019, an analysis carried out by a team of astronomers led by astronomer John R. Barnes of the Dispersed Matter Planet Project (DMPP) confirmed the existence of a super-Earth[3] in orbit around HD 42936 A (DMPP-3).

The HD 42936 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
Ab ≥ 2.58 +0.35
−0.58 M⊕		 0.0662 +0.02
−0.02		 6.6732 +0.0011
−0.0003		 0.14 — —

See also
  • List of extrasolar planets

References
  1. HD 42936, entry, SIMBAD. Accessed online December 24, 2019.
  2. Haswell, Carole A.; Staab, Daniel; Barnes, John R.; Anglada-Escudé, Guillem; Fossati, Luca; Jenkins, James S.; Norton, Andrew J.; Doherty, James P. J.; Cooper, Joseph (2019). "Dispersed Matter Planet Project discoveries of ablating planets orbiting nearby bright stars". Nature Astronomy. 4 (4): 408–418. arXiv:1912.10874. doi:10.1038/s41550-019-0973-y. S2CID 209444484.
  3. Barnes, John R.; Haswell, Carole A.; Staab, Daniel; Anglada-Escudé, Guillem; Fossati, Luca; Doherty, James P. J.; Cooper, Joseph; Jenkins, James S.; Díaz, Matías R.; Soto, Maritza G.; Peña Rojas, Pablo A. (2019). "An ablating 2.6 M⊕ planet in an eccentric binary from the Dispersed Matter Planet Project". Nature Astronomy. 4 (4): 419–426. arXiv:1912.10793. doi:10.1038/s41550-019-0972-z. S2CID 209444780.


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