HD_4308 Latitude and Longitude:
Sky map 00h 44m 39.2677s, −65° 38′ 58.280″
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HD 4308
Observation data
Epoch J2000       Equinox J2000
Constellation Tucana
Right ascension 00h 44m 39.2675s [1]
Declination –65° 38′ 58.2825″ [1]
Apparent magnitude (V) 6.544±0.005 [2]
Characteristics
Evolutionary stage main sequence
Spectral type G6VFe-0.9 [3]
Apparent magnitude (B) 7.193 [4]
Apparent magnitude (V) 6.552 [4]
Apparent magnitude (J) 5.366±0.024 [5]
Apparent magnitude (H) 5.101±0.016 [5]
Apparent magnitude (K) 4.945±0.020 [5]
Astrometry
Radial velocity (Rv)+95.251±0.0162 [6] km/s
Proper motion (μ) RA: 157.504±0.041 [1]  mas/ yr
Dec.: −741.599±0.040 [1]  mas/ yr
Parallax (π)45.3930 ± 0.0220  mas [1]
Distance71.85 ± 0.03  ly
(22.03 ± 0.01  pc)
Details [7]
Mass0.95±0.05  M☉
Radius1.04±0.03  R☉
Luminosity1.03±0.01  L☉
Surface gravity (log g)4.38±0.02  cgs
Temperature5,714±61  K
Metallicity [Fe/H]−0.35±0.07 [2]  dex
Rotational velocity (v sin i)1.0±1.0 [2] km/s
Age1.6±4.0 [7] or 10.0+0.5
−1.0 [8]  Gyr
Other designations
BD−27°223, GC 897, GJ 9028, HD 4308, HIP 3497, SAO 248244, PPM 352003, LFT 71, LHS 1139, LPM 40, LTT 416, TYC 8847-598-1, GCRV 50662, 2MASS J00443925-6538581 [9]
Database references
SIMBAD data
ARICNS data

HD 4308 is a single [2] star with an orbiting exoplanet in the southern constellation of Tucana. [9] It has a yellow hue and is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.54. [2] This object is located at a distance of 72  light years, as determined from parallax measurements. It is a population II star [2] and is considered to be a member of the thick disk. [10] The star is receding from the Sun with a radial velocity of +95 km/s. [6]

This is a Sun-like G-type main-sequence star with a stellar classification of G6VFe-0.9, [3] where the suffix notation indicates an underabundance of iron in the spectrum. The age of the star is poorly constrained, with estimated ranging from 1.6 [7] billion years up to 10 billion. [8] It has 95% of the mass of the Sun but 104% of the Sun's radius. The star is radiating nearly the same luminosity as the Sun from its photosphere at an effective temperature of 5,714 K. [7]

Planetary system

In 2005, a low-mass planet was found in orbit around this star using the radial velocity method with the HARPS spectrograph. It is following a circular orbit close to its host star with a period of just 15.6 days. Unusual for a star with planets, HD 4308 has a metallicity lower than that of the Sun. [11]

The HD 4308 planetary system [11]
Companion
(in order from star) 		Mass Semimajor axis
( AU) 		Orbital period
( days) 		Eccentricity Inclination Radius
b >0.0442  MJ 0.115 15.56±0.02 0.00±0.01 — —

See also

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f Fuhrmann, K.; et al. (2017). "Multiplicity among Solar-type Stars". The Astrophysical Journal. 836 (1): 139. Bibcode: 2017ApJ...836..139F. doi: 10.3847/1538-4357/836/1/139.
  3. ^ a b Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv: astro-ph/0603770. Bibcode: 2006AJ....132..161G. doi: 10.1086/504637. S2CID  119476992.
  4. ^ a b Koen, C.; Kilkenny, D.; van Wyk, F.; Marang, F. (April 21, 2010). "UBV(RI)CJHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949–1968. Bibcode: 2010MNRAS.403.1949K. doi: 10.1111/j.1365-2966.2009.16182.x.
  5. ^ a b c Cutri, R. M.; et al. (June 2003). 2MASS All Sky Catalog of point sources. NASA/IPAC. Bibcode: 2003tmc..book.....C.
  6. ^ a b Soubiran, C.; et al. (April 2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: 11. arXiv: 1302.1905. Bibcode: 2013A&A...552A..64S. doi: 10.1051/0004-6361/201220927. S2CID  56094559. A64.
  7. ^ 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.
  8. ^ a b Ge, Z. S.; et al. (December 2016). "Ages of 70 Dwarfs of Three Populations in the Solar Neighborhood: Considering O and C Abundances in Stellar Models". The Astrophysical Journal. 833 (2): 13. arXiv: 1612.01622. Bibcode: 2016ApJ...833..161G. doi: 10.3847/1538-4357/833/2/161. S2CID  119190116. 161.
  9. ^ a b "HD 4308". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-05.
  10. ^ Neves, V.; et al. (April 2009). "Chemical abundances of 451 stars from the HARPS GTO planet search program. Thin disc, thick disc, and planets". Astronomy and Astrophysics. 497 (2): 563–581. arXiv: 0902.3374. Bibcode: 2009A&A...497..563N. doi: 10.1051/0004-6361/200811328. S2CID  7907201.
  11. ^ a b Udry, S.; et al. (2006). "The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308". Astronomy and Astrophysics. 447 (1): 361–367. arXiv: astro-ph/0510354. Bibcode: 2006A&A...447..361U. doi: 10.1051/0004-6361:20054084. S2CID  119078261.

External links


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