HD 30669
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 48m 28.48538s[2] |
| Declination | −28° 25′ 09.4617″[2] |
| Apparent magnitude (V) | 9.11±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | G8/K0 V[4] |
| B−V color index | +0.82[3] |
| Astrometry | |
| Radial velocity (Rv) | 65.7±0.4[5] km/s |
| Proper motion (μ) | RA: +237.591 mas/yr[2] Dec.: +50.927 mas/yr[2] |
| Parallax (π) | 17.2896±0.0127 mas[2] |
| Distance | 188.6 ± 0.1 ly (57.84 ± 0.04 pc) |
| Absolute magnitude (MV) | +5.35[1] |
| Details | |
| Mass | 0.92±0.03[6] M☉ |
| Radius | 0.91±0.04[7] R☉ |
| Luminosity | 0.71[8] L☉ |
| Surface gravity (log g) | 4.43±0.06[9] cgs |
| Temperature | 5,353±100[9] K |
| Metallicity [Fe/H] | +0.13[10] dex |
| Rotational velocity (v sin i) | <1.7[7] km/s |
| Age | 7.25±4.64[11] Gyr |
| Other designations | |
| CD−28°1759, CPD−28°661, HD 30669, HIP 22320, SAO 169782, LTT 2095[12] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 30669 is a yellowish-orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 9.11,[3] making it readily visible in small telescopes but not to the naked eye. The object is relatively close at a distance of 189 light-years, based on parallax measurements from Gaia DR3.[2] Its distance from the Solar System is rapidly increasing, having a heliocentric radial velocity of 66 km/s.[5]
Characteristics
[edit]HD 30669 has a stellar classification of G8/K0 V[4] — a main sequence star with the characteristics of a star with a class of G8 or K0. It has alternatively been given a class of G9 V. It has 92% the mass of the Sun[6] and 91% its radius.[7] The object radiates 71% the luminosity of the Sun[8] from its photosphere at an effective temperature of 5,353 K[9] from its photosphere. Like most planetary hosts, HD 30669 is metal enriched, having a metallicity 35% above solar levels.[10] The star is extremely chromopsherically inactive and is estimated to be 7+1⁄4 billion years old.[11]
Planetary system
[edit]In 2015, C. Motou and colleagues discovered a long period exoplanet orbiting the star during a HARPS survey. It has nearly half the mass of Jupiter and it takes over 4+1⁄2 years to revolve HD 30669 in a slightly eccentric orbit.[7]
A candidate second planet was identified in a 2026 study using HARPS-N. This would be a super-Neptune on an eccentric orbit closer to the star, with a period of 150 days. Despite the eccentric orbits of both planets, dynamical simulations show that the two-planet system is stable.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| .01[13] (unconfirmed) | ≥28.7±3.5 M🜨 | 0.5 | 149.9±0.2 | 0.496+0.088 −0.097 |
— | — |
| b[7] | ≥0.47±0.06 MJ | 2.69±0.08 | 1684±61 | 0.33±0.06[13] | — | — |
References
[edit]- 1 2 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 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 3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
- 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- 1 2 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. eISSN 1432-0746. ISSN 0004-6361.
- 1 2 3 4 5 Moutou, C.; Lo Curto, G.; Mayor, M.; Bouchy, F.; Benz, W.; Lovis, C.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Ségransan, D.; Sousa, S. G.; Udry, S. (26 March 2015). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics. 576: A48. arXiv:1412.6591. Bibcode:2015A&A...576A..48M. doi:10.1051/0004-6361/201424965. eISSN 1432-0746. ISSN 0004-6361.
- 1 2 Loyd, R. O. Parke; Shkolnik, Evgenya L.; Schneider, Adam C.; Richey-Yowell, Tyler; Barman, Travis S.; Peacock, Sarah; Pagano, Isabella (2020). "Current Population Statistics do Not Favor Photoevaporation over Core-powered Mass Loss as the Dominant Cause of the Exoplanet Radius Gap". The Astrophysical Journal. 890 (1): 23. arXiv:1912.12305. Bibcode:2020ApJ...890...23L. doi:10.3847/1538-4357/ab6605.
- 1 2 3 Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. eISSN 1432-0746. ISSN 0004-6361.
- 1 2 Mortier, A.; Santos, N. C.; Sousa, S.; Israelian, G.; Mayor, M.; Udry, S. (March 2013). "On the functional form of the metallicity-giant planet correlation". Astronomy & Astrophysics. 551: A112. arXiv:1302.1851. Bibcode:2013A&A...551A.112M. doi:10.1051/0004-6361/201220707. eISSN 1432-0746. ISSN 0004-6361.
- 1 2 Pace, G. (22 February 2013). "Chromospheric activity as age indicator". Astronomy & Astrophysics. 551: L8. arXiv:1301.5651. Bibcode:2013A&A...551L...8P. doi:10.1051/0004-6361/201220364. eISSN 1432-0746. ISSN 0004-6361.
- ↑ "HD 30669". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2019.
- 1 2 3 Ruggieri, A.; Desidera, S.; et al. (July 2026). "The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence rates of small close-in planets in the presence of cold Jupiters". Astronomy & Astrophysics. arXiv:2607.09320.
