Astronomy:HD 30669

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Short description: Star with an exoplanet in the constellation Caelum
HD 30669
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Caelum
Right ascension  04h 48m 28.48538s[1]
Declination −28° 25′ 09.4617″[1]
Apparent magnitude (V) 9.11±0.01[2]
Characteristics
Spectral type G8/K0 V[3]
B−V color index +0.82[2]
Astrometry
Radial velocity (Rv)65.7±0.4[4] km/s
Proper motion (μ) RA: +237.591[1] mas/yr
Dec.: +50.927[1] mas/yr
Parallax (π)17.2896 ± 0.0127 mas
Distance188.6 ± 0.1 ly
(57.84 ± 0.04 pc)
Absolute magnitude (MV)+5.35[5]
Details
Mass0.92±0.03[6] M
Radius0.91±0.04[7] R
Luminosity59.7%[8] L
Surface gravity (log g)4.43±0.06[9] cgs
Temperature5,353±100[9] K
Metallicity [Fe/H]+0.13[10] dex
Rotational velocity (v sin i)<1.7[7] km/s
Age7.25±4.64[11] Gyr
Other designations
CD−28°1759, CPD−28°661, HD 30669, HIP 22320, SAO 169782, LTT 2095[12]
Database references
SIMBADdata

HD 30669 is a yellowish-orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 9.11,[2] making it readily visible in small telescopes but not to the naked eye. The object is relatively close at a distance of 188 light years, based on parallax measurements from Gaia DR3.[1] Its distance from the Solar System is rapidly increasing, having a heliocentric radial velocity of 66 km/s.[4]

Characteristics

HD 30669 has a stellar classification of G8/K0 V[3] — a main sequence star with the characteristics of a star with a class of G8 and 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 59.7% 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 14 billion years old.[11]

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 12 years to revolve HD 30669 in a slightly eccentric orbit.[7]

The HD 30669 planetary system[7]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(years)
Eccentricity Inclination Radius
b ≥0.47±0.06 MJ 2.69±0.08 4.614±0.167 0.18±0.15

References

  1. 1.0 1.1 1.2 1.3 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 2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode2000A&A...355L..27H. 
  3. 3.0 3.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars III: Declinations −40° to −26°. Bibcode1982mcts.book.....H. 
  4. 4.0 4.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode2006AstL...32..759G. 
  5. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode2012AstL...38..331A. 
  6. 6.0 6.1 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E. et al. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics 646: A77. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Bibcode2021A&A...646A..77G. 
  7. 7.0 7.1 7.2 7.3 7.4 Moutou, C.; Lo Curto, G.; Mayor, M.; Bouchy, F.; Benz, W.; Lovis, C.; Naef, D.; Pepe, F. et al. (26 March 2015). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics 576: A48. doi:10.1051/0004-6361/201424965. ISSN 0004-6361. Bibcode2015A&A...576A..48M. 
  8. 8.0 8.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S. et al. (16 April 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood". Astronomy & Astrophysics 418 (3): 989–1019. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. Bibcode2004A&A...418..989N. 
  9. 9.0 9.1 9.2 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. doi:10.1051/0004-6361/201732209. ISSN 0004-6361. Bibcode2018A&A...614A..55A. 
  10. 10.0 10.1 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. doi:10.1051/0004-6361/201220707. ISSN 0004-6361. Bibcode2013A&A...551A.112M. 
  11. 11.0 11.1 Pace, G. (22 February 2013). "Chromospheric activity as age indicator". Astronomy & Astrophysics 551: L8. doi:10.1051/0004-6361/201220364. ISSN 0004-6361. Bibcode2013A&A...551L...8P. 
  12. "HD 30669". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+30669.