Iota Capricorni
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 22m 14.79565s |
| Declination | −16° 50′ 04.3598″ |
| Apparent magnitude (V) | +4.296 |
| Characteristics | |
| Spectral type | G8 III |
| U−B color index | +0.63 |
| B−V color index | +0.89 |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | +12.31±0.13 km/s |
| Proper motion (μ) |
RA: +30.00 mas/yr Dec.: +4.52 mas/yr |
| Parallax (π) | 16.58 ± 0.27mas |
| Distance | 197 ± 3 ly (60.3 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.18 |
| Details | |
| Mass | 2.89±0.08 M☉ |
| Radius | 10.67±0.62 R☉ |
| Luminosity | 83 L☉ |
| Surface gravity (log g) | 3.05±0.10 cgs |
| Temperature | 5,200±28 K |
| Metallicity [Fe/H] | 0.05±0.05 dex |
| Rotation | 68 d |
| Rotational velocity (v sin i) | 4.37±0.45 km/s |
| Age | 390 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota Capricorni (ι Cap, ι Capricorni) is a solitary, yellow-hued star in the southern constellation of Capricornus. It can be seen with the naked eye, having an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 16.58 mas as seen from the Earth, the star is located about 197 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.08 due to interstellar dust.
This is an evolved G-type giant star with a stellar classification of G8 III. It is classified as a BY Draconis typevariable star. This is a chromospherically-active star with a longitudinal magnetic field strength of 8.3±0.6 G and an X-ray luminosity of 4.482×1030 erg s−1. The activity and photometric variation of the star allow an estimate of its rotation period as 68 days.
Iota Capricorni has an estimated 2.9 times the mass of the Sun and nearly 11 times the Solar radius. It is 390 million years old and is radiating 83 times the solar luminosity from its chromosphere at an effective temperature of 5,200 K.
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