HD 7924

Coordinates: Sky map 01h 21m 59.1153s, +76° 42′ 37.024″
Source: Wikipedia, the free encyclopedia.
HD 7924

Position of star HD 7924 in the constellation Cassiopeia
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 01h 21m 59.1132s[1]
Declination +76° 42′ 37.0373″[1]
Apparent magnitude (V) 7.167[2]
Characteristics
Evolutionary stage main sequence
Spectral type K0.5V[3]
Apparent magnitude (B) 8.005[2]
Apparent magnitude (J) 5.618[4]
Apparent magnitude (H) 5.231[4]
Apparent magnitude (K) 5.159[4]
B−V color index +0.826±0.006[5]
Distance
55.45 ± 0.02 ly
(17.001 ± 0.007 pc)
Absolute magnitude (MV)6.04[5]
Details
Gyr
GCRV 766, GSC 04494-01396, 2MASS J01215911+7642372[8]
Database references
Exoplanet Archive
data
ARICNSdata

HD 7924 is a single

apparent visual magnitude of 7.167.[2] The star is drifting closer to the Sun with a radial velocity of –22.7 km/s,[1] and is expected to approach to within 9.3 light-years in around 711,700 years.[10]

This is a

luminosity of the Sun from its photosphere at an effective temperature of 5,216 K.[6]

Planetary system

In 2009, a super-Earth exoplanet was found in orbit around the star.[11] In 2015, two more planets were discovered, and the mass of the original planet was revised downwards slightly.[12][9] It is possible that planets c and d are in the 8:5 mean motion resonance.[13] All of the planets lie inside the star's habitable zone.[9]

The HD 7924 planetary system[9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 8.68±0.52 M🜨 0.05664±0.00068 5.39792±0.00025 0.058 +0.056
−0.040 		— —
c ≥ 7.86±0.72 M🜨 0.1134±0.0014 15.299±0.0033 0.098 +0.096
−0.069 		— —
d ≥ 6.44±0.79 M🜨 0.1551±0.0019 24.451±0.016 0.21 +0.13
−0.12 		— —

See also

  • List of extrasolar planets

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    ISBN 978-0333750889. {{cite book}}: |journal= ignored (help
    )
  3. ^
    doi:10.1093/mnras/stt2360
    .
  4. ^
    Bibcode:2003tmc..book.....C
    .
  5. ^
    S2CID 119257644
    .
  6. ^
    S2CID 54555839
    .
  7. ^
    S2CID 119511744
    , 21.
  8. ^ "HD 7924". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-07.
  9. ^
    S2CID 7969255
    .
  10. S2CID 56269929
    .
  11. S2CID 1415310
    .
  12. ^ Sanders, Robert (April 28, 2015). "Robotic telescope discovers three super-Earth planetary neighbors". Berkeley News. UC Berkeley. Retrieved 2019-11-07.
  13. S2CID 118542104
    .
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