HD 7924

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]
Astrometry
Radial velocity (Rv)−22.70±0.15[1] km/s
Proper motion (μ) RA: −34.643±0.041[1] mas/yr
Dec.: −32.660±0.038[1] mas/yr
Parallax (π)58.8216 ± 0.0249 mas[1]
Distance55.45 ± 0.02 ly
(17.001 ± 0.007 pc)
Absolute magnitude (MV)6.04[5]
Details[6]
Mass0.81±0.01 M☉
Radius0.74±0.01 R☉
Luminosity0.364±0.001 L☉
Surface gravity (log g)4.6±0.01 cgs
Temperature5,216±13 K
Metallicity [Fe/H]−0.15±0.03 dex
Rotational velocity (v sin i)0.9[7] km/s
Age3.0±1.8 Gyr
Other designations
BD+75°58, GJ 56.5, HD 7924, HIP 6379, SAO 4386, PPM 4675, TYC 4494-1346-1, GCRV 766, GSC 04494-01396, 2MASS J01215911+7642372[8]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata

HD 7924 is a single[9] star located 55.5[1] light years away from the Sun in the northern constellation of Cassiopeia, near the northern constellation border with Cepheus. It has an orange hue and is only visible by means of binoculars or a telescope due to a low 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 K-type main-sequence star with a stellar classification of K0.5V.[3] Low-level chromospheric activity has been detected, with the star showing spots and an activity cycle.[9] The star is about three[6] billion years old and is spinning with a projected rotational velocity of just 0.9 km/s.[7] It has 81% of the mass of the Sun and 74% of the Sun's radius. The metal content is about seven-tenths as much as the Sun. It is radiating 36.4% of the luminosity of the Sun from its photosphere at an effective temperature of 5,216 K.[6]

  1. ^ a b c d e f g h Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Høg2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference vonBraun2014 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Cutri2003 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Fulton2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference BailerJones2018 was invoked but never defined (see the help page).