Iota Pavonis
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h 10m 26.15370s |
| Declination | −62° 00′ 07.9922″ |
| Apparent magnitude (V) | 5.47 |
| Characteristics | |
| Spectral type | G0V |
| Apparent magnitude (B) | 6.07 |
| Apparent magnitude (J) | 4.43±0.31 |
| Apparent magnitude (H) | 4.02±0.24 |
| Apparent magnitude (K) | 4.130±0.266 |
| Astrometry | |
| Radial velocity (Rv) | 30.20±0.14 km/s |
| Proper motion (μ) | RA: −76.952±0.159 mas/yr Dec.: 222.452±0.188 mas/yr |
| Parallax (π) | 56.1961±0.2674 mas |
| Distance | 58.0 ± 0.3 ly (17.79 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.24±0.02 |
| Orbit | |
| 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 M☉ |
| Radius | 1.26+0.02 −0.03 R☉ |
| Luminosity | 1.85+0.13 −0.11 L☉ |
| Surface gravity (log g) | 4.29±0.07 cgs |
| Temperature | 5951±29 K |
| Metallicity [Fe/H] | −0.07±0.06 dex |
| Rotational velocity (v sin i) | 2.5 km/s |
| Age | 7.221+2.747 −1.990 Gyr |
| ι Pavonis B | |
| Mass | 141±10 MJup |
| Other designations | |
| ι Pav, CD−62 1190, GJ 9616, HD 165499, HIP 89042, HR 6761, SAO 254157, LTT 7205, 2MASS J18102614-6200078 | |
| Database references | |
| SIMBAD | data |
Iota Pavonis (Latinized from ι Pavonis) is a binary star 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. It has an apparent visual magnitude of 5.47, making it very faintly visible to the naked eye from the southern hemisphere.
Iota Pavonis consists of a solar-type primary star and a low-mass stellar companion detected by radial velocity and astrometry.
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.
Properties
The primary star has a stellar classification of G0 V, 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. At an age of about 7 billion years, it is significantly older than the Sun.
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.
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), 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.
See also
References
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 Lund, Mikkel N.; et al. (2025). "Luminaries in the sky: The TESS legacy sample of bright stars". Astronomy & Astrophysics. 701. EDP Sciences: A285. arXiv:2508.08699. Bibcode:2025A&A...701A.285L. doi:10.1051/0004-6361/202555485. ISSN 0004-6361.
- 1 2 Gray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. ISSN 0004-6256.
- ↑ Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024). "HPIC: The Habitable Worlds Observatory Preliminary Input Catalog". The Astronomical Journal. 167 (3): 139. Bibcode:2024AJ....167..139T. doi:10.3847/1538-3881/ad25ec.
- 1 2 3 Cutri, R. M.; et al. (June 2003). "The IRSA 2MASS all-sky point source catalog, NASA/IPAC infrared science archive". The IRSA 2MASS All-Sky Point Source Catalog. Bibcode:2003tmc..book.....C.
- ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ↑ Holmberg, J.; Nordström, B.; Andersen, J. (2009-05-13). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy & Astrophysics. 501 (3). EDP Sciences: 941–947. arXiv:0811.3982. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191. ISSN 0004-6361. S2CID 118577511.
- 1 2 3 4 Barbato, D.; et al. (2023). "The CORALIE survey for southern extrasolar planets. XIX. Brown dwarfs and stellar companions unveiled by radial velocity and astrometry". Astronomy & Astrophysics. 674. EDP Sciences: A114. arXiv:2303.16717. Bibcode:2023A&A...674A.114B. doi:10.1051/0004-6361/202345874. ISSN 0004-6361.
- 1 2 3 4 Harada, Caleb K.; et al. (2024-06-01). "Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets". The Astrophysical Journal Supplement Series. 272 (2): 30. arXiv:2401.03047. Bibcode:2024ApJS..272...30H. doi:10.3847/1538-4365/ad3e81. ISSN 0067-0049.
- 1 2 3 Soubiran, C.; et al. (2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy & Astrophysics. 663. EDP Sciences: A4. arXiv:2112.07545. Bibcode:2022A&A...663A...4S. doi:10.1051/0004-6361/202142409. ISSN 0004-6361.
- ↑ Chavero, C; et al. (2019-06-03). "Emerging trends in metallicity and lithium properties of debris disc stars". Monthly Notices of the Royal Astronomical Society. 487 (3). Oxford University Press (OUP): 3162–3177. arXiv:1905.12066. Bibcode:2019MNRAS.487.3162C. doi:10.1093/mnras/stz1496. ISSN 0035-8711.
- 1 2 Souza dos Santos, P V; et al. (2024-06-20). "Fine structure of the age–chromospheric activity relation in solar-type stars: II. Hα line". Monthly Notices of the Royal Astronomical Society. 532 (1). Oxford University Press (OUP): 563–576. arXiv:2406.12519. Bibcode:2024MNRAS.532..563S. doi:10.1093/mnras/stae1532. ISSN 0035-8711.
- 1 2 "iot Pav -- Spectroscopic Binary". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2026-03-09.
- ↑ Fuhrmann, K.; et al. (February 2017). "Multiplicity among Solar-type Stars". The Astrophysical Journal. 836 (1): 23. Bibcode:2017ApJ...836..139F. doi:10.3847/1538-4357/836/1/139. 139.
- ↑ Harada, Caleb K.; et al. (2025-12-01). "SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring". The Astronomical Journal. 170 (6): 343. arXiv:2409.10679. Bibcode:2025AJ....170..343H. doi:10.3847/1538-3881/ae0b62. ISSN 0004-6256.
- ↑ Mamajek, Eric; Stapelfeldt, Karl (2024-02-19). "NASA Exoplanet Exploration Program (ExEP) Mission Star List for the Habitable Worlds Observatory (2023)". arXiv:2402.12414 [astro-ph.IM].
