Astronomy:GJ 2030

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Short description: Star in the constellation Eridanus
GJ 2030
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus[1]
Right ascension  03h 23m 17.70116s[2]
Declination −07° 47′ 38.7554″[2]
Apparent magnitude (V) 6.206±0.003[3]
Characteristics
Evolutionary stage subgiant[2]
Spectral type G5/6V[4]
Astrometry
Radial velocity (Rv)+41.67±0.16[2] km/s
Proper motion (μ) RA: +1.295[2] mas/yr
Dec.: −219.292[2] mas/yr
Parallax (π)26.7913 ± 0.0912[2] mas
Distance121.7 ± 0.4 ly
(37.3 ± 0.1 pc)
Absolute magnitude (MV)+3.35[1]
Details[5]
Mass1.022±0.024 M☉
Radius2.429±0.061 R☉
Luminosity4.064±0.043 L☉
Surface gravity (log g)3.73±0.12 cgs
Temperature5,259±66 K
Metallicity [Fe/H]−0.45±0.02 dex
Age6.39[6] Gyr
Other designations
BD−08°643, GJ 2030, HD 21019, HIP 15776, HR 1024, TYC 5295-1155-1[7]
Database references
SIMBADdata
Exoplanet Archivedata

GJ 2030 is a star in the constellation Eridanus. At an apparent magnitude of +6.206,[3] it is close to the average threshold for naked eye visibility, and can only be viewed from sufficiently dark skies, far from light pollution.[8] Parallax measurements by the Gaia spacecraft measured a distance of 121.7 light-years, give or take 0.4 light-years.[2]

The spectrum of this star matches a spectral class of G5/6V,[4] with the luminosity class V suggesting it is a main sequence star, but its physical properties suggest it is actually a subgiant.[2] It has 1.02 times the Sun's mass and 2.43 times the Sun's radius. It radiates 4.06 times the Sun's luminosity from its photosphere at an effective temperature of 5,259 K.[5] At this temperature, the star shines with a yellowish color typical of G-type stars.[9]

GJ 2030 is likely a member of the thick disk population,[10] with a substantially lower metallicity than the Sun.[5] Its age is estimated at 6.39 billion years, older than the Solar System.[6]

Planetary system

Two extrasolar planets were discovered around the star in 2022, detected via Doppler spectroscopy (radial velocity method) and astrometry.[11]

The GJ 2030 planetary system[11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b ≥0.015±0.002 MJ 0.034+0.001
−0.002 		0.0065196±0.0000004 0.239+0.075
−0.058 		— —
c 12.803+2.335
−2.136 MJ 		16.761+1.294
−1.337 		69.91+6.36
−7.00 		0.041+0.003
−0.008 		16.999+2.935
−2.535° 		—

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
  3. ↑ 3.0 3.1 Paunzen, E. (August 2015). "A new catalogue of Strömgren-Crawford uvbyβ photometry" (in en). Astronomy and Astrophysics 580: A23. doi:10.1051/0004-6361/201526413. ISSN 0004-6361. Bibcode: 2015A&A...580A..23P. 
  4. ↑ 4.0 4.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5" (in en). Michigan Spectral Survey 5: 0. Bibcode: 1999MSS...C05....0H. 
  5. ↑ 5.0 5.1 5.2 Soubiran, C. et al. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics 682: A145. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. Bibcode: 2024A&A...682A.145S. 
  6. ↑ 6.0 6.1 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey" (in en). Astronomy and Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C. 
  7. ↑ "GJ 2030". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GJ+2030. 
  8. ↑ "Limiting Magnitude | COSMOS". https://astronomy.swin.edu.au/cosmos/l/Limiting+Magnitude. 
  9. ↑ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16. 
  10. ↑ Horch, Elliott P.; van Belle, Gerard T.; Davidson, James W.; Ciastko, Lindsay A.; Everett, Mark E.; Bjorkman, Karen S. (November 2015). "Observations of Binary Stars with the Differential Speckle Survey Instrument. VI. Measures during 2014 at the Discovery Channel Telescope" (in en). The Astronomical Journal 150 (5): 151. doi:10.1088/0004-6256/150/5/151. ISSN 0004-6256. Bibcode: 2015AJ....150..151H. 
  11. ↑ 11.0 11.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F. 

Coordinates: Sky map 03h 23m 17.70s, −07° 47′ 38.8″



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