HD 92209
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 10h 35m 24.7604s[2] |
| Declination | −76° 18′ 32.337″[2] |
| Apparent magnitude (V) | 6.29±0.01[3] |
| Characteristics | |
| Spectral type | K2 III[4] |
| U−B color index | +1.27[5] |
| B−V color index | +1.20[5] |
| Astrometry | |
| Radial velocity (Rv) | 17.8±2.3[6] km/s |
| Proper motion (μ) | RA: −16.952 mas/yr[2] Dec.: +6.489 mas/yr[2] |
| Parallax (π) | 5.4324±0.1144 mas[2] |
| Distance | 600 ± 10 ly (184 ± 4 pc) |
| Absolute magnitude (MV) | +0.53[1] |
| Details | |
| Mass | 1.22[7] M☉ |
| Radius | 14.39[8] R☉ |
| Luminosity | 81.3+9.9 −8.8[9] L☉ |
| Surface gravity (log g) | 1.76[7] cgs |
| Temperature | 4,460±90[9] K |
| Metallicity [Fe/H] | +0.06[10] dex |
| Rotational velocity (v sin i) | <1[11] km/s |
| Other designations | |
| 22 G. Chamaeleontis, CPD−75°678, FK5 2847, GC 14595, HD 92209, HIP 51835, HR 4170, SAO 256730[12][13] | |
| Database references | |
| SIMBAD | data |
HD 92209 (HR 4170) is a probable spectroscopic binary[11] in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.29,[3] placing it near the max naked eye visibility. Parallax measurements place the system at a distance of 600 light years[2] and is currently receding with a heliocentric radial velocity of almost 18 km/s.[6]
The visible component has a stellar classification of K2 III,[4] indicating that it is a red giant. As a consequence, it has expanded to 14.39 times the radius of the Sun.[8] Nevertheless, it has 122% the mass of the Sun[7] and shines with a luminosity of 81.3 L☉,[9] yielding an effective temperature of 4,460 K[9] from its enlarged photosphere, which in turn gives an orange hue. HD 92209 has a metallicity 115% that of the Sun[10] and spins leisurely with a projected rotational velocity lower than 1 km/s.[11]
