HD 92209

HD 92209
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 35m 24.7604s[1]
Declination −76° 18′ 32.3366″[1]
Apparent magnitude (V) 6.29±0.01[2]
Characteristics
Spectral type K2 III[3]
U−B color index +1.27[4]
B−V color index +1.20[4]
Astrometry
Radial velocity (Rv)17.8±2.3[5] km/s
Proper motion (μ) RA: −16.952 mas/yr[1]
Dec.: +6.489 mas/yr[1]
Parallax (π)5.4324 ± 0.1144 mas[1]
Distance600 ± 10 ly
(184 ± 4 pc)
Absolute magnitude (MV)−0.03
Details
Mass1.22[6] M☉
Radius14.39[7] R☉
Luminosity81.3+9.9
−8.8[8] L☉
Surface gravity (log g)1.76[6] cgs
Temperature4,460±90[8] K
Metallicity [Fe/H]+0.06[9] dex
Rotational velocity (v sin i)<1[10] km/s
Other designations
22 G. Chamaeleontis, CPD−75°678, FK5 2847, GC 14595, HD 92209, HIP 51835, HR 4170, SAO 256730[11][12]
Database references
SIMBADdata

HD 92209 (HR 4170) is a probable spectroscopic binary[10] in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.29,[2] placing it near the max naked eye visibility. Parallax measurements place the system at a distance of 600 light years[1] and is currently receding with a heliocentric radial velocity of almost 18 km/s.[5]

The visible component has a stellar classification of K2 III,[3] indicating that it is a red giant. As a consequence, it has expanded to 14.39 times the radius of the Sun.[7] Nevertheless, it has 122% the mass of the Sun[6] and shines with a luminosity of 81.3 L☉,[8] yielding an effective temperature of 4,460 K[8] from its enlarged photosphere, which in turn gives an orange hue. HD 92209 has a metallicity 115% that of the Sun[9] and spins leisurely with a projected rotational velocity lower than 1 km/s.[10]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 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. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella2022 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Eggen1994 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).