Astronomy:Iota Pavonis

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Short description: Star in the constellation Pavo


Iota Pavonis
Location of ι Pavonis (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: 222.452±0.188[1] mas/yr
Parallax (π)56.1961 ± 0.2674[1] mas
Distance58.0 ± 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
Mass1.03+0.10
−0.06[9] M☉
Radius1.26+0.02
−0.03[9] R☉
Luminosity1.85+0.13
−0.11[9] L☉
Surface gravity (log g)4.29±0.07[10] cgs
Temperature5951±29[10] K
Metallicity [Fe/H]−0.07±0.06[10] dex
Rotational velocity (v sin i)2.5[11] km/s
Age7.221+2.747
−1.990[12] Gyr
ι Pavonis B
Mass141±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
SIMBADdata

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.

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 astronomical unit|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]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Lund, Mikkel N. et al. (2025). "Luminaries in the sky: The TESS legacy sample of bright stars". Astronomy & Astrophysics (EDP Sciences) 701: A285. doi:10.1051/0004-6361/202555485. ISSN 0004-6361. Bibcode: 2025A&A...701A.285L. 
  3. ↑ 3.0 3.1 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. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G. 
  4. ↑ Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024). "HPIC: The Habitable Worlds Observatory Preliminary Input Catalog". The Astronomical Journal 167 (3): 139. doi:10.3847/1538-3881/ad25ec. Bibcode: 2024AJ....167..139T. 
  5. ↑ 5.0 5.1 5.2 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. http://irsa.ipac.caltech.edu/applications/Gator/. 
  6. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ 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 (EDP Sciences) 501 (3): 941–947. doi:10.1051/0004-6361/200811191. ISSN 0004-6361. Bibcode: 2009A&A...501..941H. 
  8. ↑ 8.0 8.1 8.2 8.3 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 (EDP Sciences) 674: A114. doi:10.1051/0004-6361/202345874. ISSN 0004-6361. Bibcode: 2023A&A...674A.114B. 
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.3847/1538-4365/ad3e81. ISSN 0067-0049. Bibcode: 2024ApJS..272...30H. 
  10. ↑ 10.0 10.1 10.2 Soubiran, C. et al. (2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy & Astrophysics (EDP Sciences) 663: A4. doi:10.1051/0004-6361/202142409. ISSN 0004-6361. Bibcode: 2022A&A...663A...4S. 
  11. ↑ 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 (Oxford University Press (OUP)) 487 (3): 3162–3177. doi:10.1093/mnras/stz1496. ISSN 0035-8711. Bibcode: 2019MNRAS.487.3162C. 
  12. ↑ 12.0 12.1 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 (Oxford University Press (OUP)) 532 (1): 563–576. doi:10.1093/mnras/stae1532. ISSN 0035-8711. Bibcode: 2024MNRAS.532..563S. 
  13. ↑ 13.0 13.1 "iot Pav -- Spectroscopic Binary". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Iota+Pavonis. 
  14. ↑ Fuhrmann, K. et al. (February 2017). "Multiplicity among Solar-type Stars". The Astrophysical Journal 836 (1): 23. doi:10.3847/1538-4357/836/1/139. 139. Bibcode: 2017ApJ...836..139F. 
  15. ↑ 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. doi:10.3847/1538-3881/ae0b62. ISSN 0004-6256. Bibcode: 2025AJ....170..343H. 
  16. ↑ 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].

Coordinates: Sky map 18h 10m 26.15370s, −62° 00′ 07.99218″



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