Langbahn Team – Weltmeisterschaft

HD 30669

HD 30669
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: +50.927 mas/yr[1]
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+1⁄4 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+1⁄2 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. ^ a b c d 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.
  2. ^ a b c 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.
  3. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  4. ^ a b 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.
  5. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  6. ^ a b 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.
  7. ^ a b c d e 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.
  8. ^ a b Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (16 April 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. eISSN 1432-0746. ISSN 0004-6361.
  9. ^ a b c 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.
  10. ^ a b 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.
  11. ^ a b 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.
  12. ^ "HD 30669". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2019.
Quelle: https://en.wikipedia.org/wiki/HD_30669_b