42 Herculis

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42 Herculis

42 Herculis in optical light
Observation data
J2000
Constellation Hercules
Right ascension 16h 38m 44.84465s[1]
Declination +48° 55′ 42.0160″[1]
Apparent magnitude (V) 4.86[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M2.5III[3]
B−V color index 1.562±0.011[2]
Distance
450 ± 10 ly
(137 ± 3 pc)
Absolute magnitude (MV)−0.65[2]
Details
Radius63.81+5.20
−7.75[1] R☉
Luminosity733.6±20.5[1] L☉
Surface gravity (log g)1.50[4] cgs
Temperature3,760.5+251.5
−144.5[1] K
HR 6200, SAO 46210, WDS J16387+4856[5]
Database references
SIMBADdata

42 Herculis is a single

apparent visual magnitude of 4.86.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −56 km/s.[2]

This is an aging

luminosity of the Sun from its swollen photosphere at an effective temperature of 3761 K.[1]

There is an unknown source of X-ray and far ultraviolet emission originating from a location offset by more than one arcsecond from the star.[8] This may indicate there is an undetected main sequence companion.[4]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    doi:10.1086/116239
    .
  4. ^
    S2CID 118619933
    .
  5. ^ a b c "42 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-13.
  6. S2CID 14878976
    .
  7. Bibcode:1992IBVS.3792....1P
    .
  8. S2CID 18739721
    .
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