Iota Pavonis
Star in the constellation Pavo
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Iota Pavonis (Latinized from ι Pavonis) is a binary star[14] in the southern constellation of Pavo. It is located at a distance of 58.0 light-years (17.79 parsecs) from the Sun based on its parallax.[1] It has an apparent visual magnitude of 5.47,[2] making it very faintly visible to the naked eye from the southern hemisphere.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h 10m 26.15370s[1] |
| Declination | −62° 00′ 07.9922″[1] |
| Apparent magnitude (V) | 5.47[2] |
| Characteristics | |
| Spectral type | G0V[3] |
| Apparent magnitude (B) | 6.07[4] |
| Apparent magnitude (J) | 4.43±0.31[5] |
| Apparent magnitude (H) | 4.02±0.24[5] |
| Apparent magnitude (K) | 4.130±0.266[5] |
| Astrometry | |
| Radial velocity (Rv) | 30.20±0.14[6] km/s |
| Proper motion (μ) | RA: −76.952±0.159 mas/yr[1] Dec.: 222.452±0.188 mas/yr[1] |
| Parallax (π) | 56.1961±0.2674 mas[1] |
| Distance | 58.0 ± 0.3 ly (17.79 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.24±0.02[7] |
| Orbit[8] | |
| Period (P) | 8304.32±15.34 d |
| Semi-major axis (a) | 8.56+0.29 −0.31 au |
| Eccentricity (e) | 0.43430±0.00160 |
| Inclination (i) | 79.55+0.59 −0.60° |
| Argument of periastron (ω) (secondary) | 203.74+0.38 −0.40° |
| Semi-amplitude (K1) (primary) | 1.355±0.003 km/s |
| Details | |
| ι Pavonis A | |
| Mass | 1.03+0.10 −0.06[9] M☉ |
| Radius | 1.26+0.02 −0.03[9] R☉ |
| Luminosity | 1.85+0.13 −0.11[9] L☉ |
| Surface gravity (log g) | 4.29±0.07[10] cgs |
| Temperature | 5951±29[10] K |
| Metallicity [Fe/H] | −0.07±0.06[10] dex |
| Rotational velocity (v sin i) | 2.5[11] km/s |
| Age | 7.221+2.747 −1.990[12] Gyr |
| ι Pavonis B | |
| Mass | 141±10[8] MJup |
| Other designations | |
| ι Pav, CD−62 1190, GJ 9616, HD 165499, HIP 89042, HR 6761, SAO 254157, LTT 7205, 2MASS J18102614-6200078[13] | |
| Database references | |
| SIMBAD | data |
Iota Pavonis consists of a solar-type primary star and a low-mass stellar companion detected by radial velocity and astrometry.[8]
Nomenclature
ι Pavonis (Latinized to Iota Pavonis) is the star's Bayer designation, abbreviated Iota Pav or ι Pav. It is also known by its Henry Draper Catalogue designation HD 165499, as well as several other catalogue designations.[13]
Properties
The primary star has a stellar classification of G0 V,[3] indicating that it is a G-type main sequence star. It is similar to the Sun, having a similar mass, slightly hotter effective temperature, and slightly lower metallicity; but is somewhat larger and more luminous.[9] At an age of about 7 billion years, it is significantly older than the Sun.[12]
Radial velocity and astrometric measurements suggest that the low-mass stellar companion has a mass of around 0.13 solar masses, and orbits the primary star in a moderately eccentric orbit at a distance of around 9 AU.[8]
Iota Pavonis is not listed in the Washington Double Star Catalog, and hence is included in the NASA Exoplanet Exploration Program (ExEP) Mission Star List (EMSL),[15] despite the separation between the two stars being less than 1 arcsecond, whereas the EMSL intended to exclude binaries with stellar companion separated by less than 3 arcseconds.[16]