HD 30562 is a star in the equatorial constellation of Eridanus. It has a golden hue and can be viewed with the naked eye under good seeing conditions, having an apparent visual magnitude of 5.77.[2] The distance to this star is 85 light years based on parallax.[1] It is drifting further away with a high radial velocity of +77 km/s,[7] having come to within 46.8 light-years some 236,000 years ago.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 48m 36.38509s[1] |
| Declination | −05° 40′ 26.5577″[1] |
| Apparent magnitude (V) | 5.77[2] |
| Characteristics | |
| Spectral type | G2IV[3][2] or G5V[4] or F8V[5][6] |
| Apparent magnitude (B) | 6.401[2] |
| Apparent magnitude (J) | 4.984±0.262[2] |
| Apparent magnitude (H) | 4.574±0.266[2] |
| Apparent magnitude (K) | 4.310±0.049[2] |
| B−V color index | 0.631±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | 77.24±0.09[7] km/s |
| Proper motion (μ) | RA: 311.406 mas/yr[1] Dec.: −248.834 mas/yr[1] |
| Parallax (π) | 38.2495 ± 0.0399 mas[1] |
| Distance | 85.27 ± 0.09 ly (26.14 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.66[2] |
| Details[6] | |
| Mass | 1.25±0.03 M☉ |
| Radius | 1.57±0.03 R☉ |
| Luminosity | 2.82±0.01 L☉ |
| Surface gravity (log g) | 4.14±0.02 cgs |
| Temperature | 5,983±37 K |
| Metallicity [Fe/H] | 0.23[8] dex |
| Rotation | 24.2 days[5] |
| Rotational velocity (v sin i) | 5.8[8] km/s |
| Age | 4.4±0.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
The stellar classification of HD 30562 has varied somewhat depending on the study, including types G2IV,[3] G5V,[4] and F8V.[5] It is about 4.4[6] billion years old and appears to be chromospherically inactive.[5] The star is spinning with a projected rotational velocity of 5.8 km/s,[8] giving it a rotation period of 24.2 days.[5] Based on the abundance of iron appearing in the sprectrum, the metallicity of this star, what astronomers term the abundance of elements with higher atomic numbers than helium, is about 70% higher than in the Sun.[8] HD 30562 has 25% greater mass than the Sun and a 57% larger radius. The star is radiating almost three times the luminosity of the Sun from its photosphere at an effective temperature of 5,983 K.[6]
Planetary system
editIn August 2009, it was found that this star has a Jupiter-like planet that orbits in a very eccentric path.[5][10] In 2023, the inclination and true mass of HD 30562 b were determined via astrometry.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.47+0.45 −0.18 MJ |
2.299+0.032 −0.033 |
3.158+0.039 −0.042 |
0.748+0.036 −0.042 |
65+17 −22 or 115+22 −17° |
— |
See also
editReferences
edit- ^ 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 c d e f g h i j 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 Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b c d e f Fischer, Debra; et al. (2009). "Five planets and an independent confirmation of HD 196885 Ab from Lick Observatory". The Astrophysical Journal. 703 (2): 1545–1556. arXiv:0908.1596. Bibcode:2009ApJ...703.1545F. doi:10.1088/0004-637X/703/2/1545. S2CID 15524804.
- ^ 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.
- ^ a b Nidever, David L.; et al. (August 2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
- ^ a b c d Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ "HD 30562". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-14.
- ^ Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639. S2CID 59467665.
- ^ a b Xiao, Guang-Yao; Liu, Yu-Juan; et al. (March 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5). arXiv:2303.12409. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e. S2CID 257663647.