HD 30669

HD 30669
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Caelum
Right ascension	04h 48m 28.48538s
Declination	−28° 25′ 09.4617″
Apparent magnitude (V)	9.11±0.01
Characteristics
Evolutionary stage	main sequence
Spectral type	G8/K0 V
B−V color index	+0.82
Astrometry
Radial velocity (Rv)	65.7±0.4 km/s
Proper motion (μ)	RA: +237.591 mas/yr ; Dec.: +50.927 mas/yr
Parallax (π)	17.2896±0.0127 mas
Distance	188.6 ± 0.1 ly ; (57.84 ± 0.04 pc)
Absolute magnitude (MV)	+5.35
Details
Mass	0.92±0.03 M☉
Radius	0.91±0.04 R☉
Luminosity	0.71 L☉
Surface gravity (log g)	4.43±0.06 cgs
Temperature	5,353±100 K
Metallicity [Fe/H]	+0.13 dex
Rotational velocity (v sin i)	<1.7 km/s
Age	7.25±4.64 Gyr
Other designations
	CD−28°1759, CPD−28°661, HD 30669, HIP 22320, SAO 169782, LTT 2095
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, 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. Its distance from the Solar System is rapidly increasing, having a heliocentric radial velocity of 66 km/s.

Characteristics

HD 30669 has a stellar classification of G8/K0 V — 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 and 91% its radius. The object radiates 71% the luminosity of the Sun from its photosphere at an effective temperature of 5,353 K from its photosphere. Like most planetary hosts, HD 30669 is metal enriched, having a metallicity 35% above solar levels. The star is extremely chromopsherically inactive and is estimated to be 7+1⁄4 billion years old.

Planetary system

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.

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.

The HD 30669 planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination (°)	Radius
.01 (unconfirmed)	≥28.7±3.5 `M`_🜨	0.5	149.9±0.2	0.496+0.088 −0.097	—	—
b	≥0.47±0.06 `M`_J	2.69±0.08	1684±61	0.33±0.06	—	—

References

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.

[Anderson2012-1] 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.

[GaiaDR3-2] 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.

[Tycho2000-3] 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.

[Houk1982-4] 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.

[Gontcharov2006-5] 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.

[Gomes_da_Silva2021-6] 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.

[Moutou2015-7] 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.

[loyd2020-8] 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.

[Aguilera-Gómez2018-9] 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.

[Mortier2013-10] 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.

[Pace2013-11] 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.

[SIMBAD-12] "HD 30669". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2019.

[Ruggieri2026-13] 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.