Iota Chamaeleontis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 09h 24m 09.22580s[1] |
| Declination | −80° 47′ 12.7597″[1] |
| Apparent magnitude (V) | 5.34[2] |
| Characteristics | |
| Spectral type | F3/5 III/V[3] |
| U−B color index | +0.01[4] |
| B−V color index | +0.454±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.57±0.66[1] km/s |
| Proper motion (μ) | RA: -138.690[1] mas/yr Dec.: +134.928[1] mas/yr |
| Parallax (π) | 17.3878±0.0925 mas[1] |
| Distance | 187.6 ± 1.0 ly (57.5 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.52[2] |
| Details | |
| Radius | 3.63+0.10 −0.13[1] R☉ |
| Luminosity | 20.244±0.136[1] L☉ |
| Temperature | 6,429+63 −90[1] K |
| Metallicity [Fe/H] | −0.04[5] dex |
| Rotational velocity (v sin i) | 129.7[6] km/s |
| Age | 1.2±0.1[2] Gyr |
| Other designations | |
| ι Cha, CD−80°329, FK5 2753, GC 13066, HD 82554, HIP 46107, HR 3795, SAO 258530[7] | |
| Database references | |
| SIMBAD | data |
ι Chamaeleontis, Latinized as Iota Chamaeleontis, is a single[8] star in the southern circumpolar constellation of Chamaeleon. It is visible to the naked eye as a dim, yellow-white hued point of light, having an apparent magnitude of about 5.3.[2] Based upon parallax measurements,[1] this star is around 188 light years away from the Sun, but it is drifting closer with a radial velocity of −4 km/s.[1]
Spectra of the star taken in different years have been given types of F3IV/V and F5III, leading to a mean published type of F3/5 III/V, with the suspicion that the spectrum is variable. It is an F-type star, likely an evolving subgiant.[9] It is 1.2[2] billion years old with 3.6[1] times the Sun's radius. The star has a high rate of spin with a projected rotational velocity of 130 km/s,[6] which is giving it an oblate shape with an equatorial bulge some 9% larger than the polar radius.[10] It is radiating over 20[1] times the Sun's luminosity from its photosphere at an effective temperature of 6,429 K.[1] An infrared excess suggests a circumstellar disk of dust is orbiting at a distance of 8.3 AU from the star with a mean temperature of 200 K.[11]
References
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- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
