HD 82886, also named Illyrian, is a star with an orbiting exoplanet in the constellation Leo Minor. It has an apparent visual magnitude of 7.63,[3] which indicates it is too faint to be viewed with the naked eye. The distance to this system is approximately 413 light years, as measured using parallax.[2] It is drifting further away with a heliocentric radial velocity of 12.7 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor[1] |
| Right ascension | 09h 35m 45.184s[2] |
| Declination | +34° 46′ 50.67″[2] |
| Apparent magnitude (V) | 7.63[3] |
| Characteristics | |
| Evolutionary stage | Subgiant[4] |
| Spectral type | G0[1] |
| B−V color index | 0.864±0.009[1] |
| Astrometry | |
| Radial velocity (Rv) | 12.73±0.16[5] km/s |
| Proper motion (μ) | RA: 16.321 mas/yr[2] Dec.: −35.251 mas/yr[2] |
| Parallax (π) | 7.8954 ± 0.0315 mas[2] |
| Distance | 413 ± 2 ly (126.7 ± 0.5 pc) |
| Absolute magnitude (MV) | +2.3[4] |
| Details | |
| Mass | 2.53±0.46[6] M☉ |
| Radius | 5.26±0.31[6] R☉ |
| Luminosity | 11.9±0.1[7] L☉ |
| Surface gravity (log g) | 3.40±0.06[6] cgs |
| Temperature | 4,953±123[6] K |
| Metallicity [Fe/H] | −0.31[6] dex |
| Age | 3.4±0.6[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging subgiant star with a stellar classification of G0.[4] With 2.5[6] times the mass of the Sun, at the age of 3–4 billion[7] years it has exhausted the supply of hydrogen at its core and expanded to more than five times the radius of the Sun.[6] The star is radiating nearly 12[7] times the luminosity of the Sun from its photosphere at an effective temperature of 4,953 K.[6]
HD 82886, and its planet HD 82886b, were chosen as part of the 2019 NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. HD 82886 was assigned to Albania. The winning proposal named the star Illyrian after the ancient people of the Balkans region (including Albania), and the planet Arber after the medieval term for the inhabitants of Albania.[9]
Planetary system
editA super-jovian exoplanet was discovered in 2011. It has at least 1.3 times the mass of Jupiter and is orbiting the host star at an approximate distance of 1.65 AU every 705 days.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Arber) | ≥1.3±0.1 MJ | 1.65±0.06 | 705±34 | <0.27 | — | — |
References
edit- ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c d e 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.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
- ^ a b c d Johnson, John Asher; et al. (2011). "Retired a Stars and Their Companions. Vii. 18 New Jovian Planets". The Astrophysical Journal Supplement Series. 197 (2): 26. arXiv:1108.4205. Bibcode:2011ApJS..197...26J. doi:10.1088/0067-0049/197/2/26. S2CID 15088371.
- ^ a b 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.
- ^ a b c d e f g h Stassun, Keivan G.; et al. (2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
- ^ a b c d Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575: A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- ^ "HD 82886". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-05-31.
- ^ "Albania". NameExoworlds. Retrieved 2019-12-18.
- ^ HD 82886 b on exoplanet.eu