HD 138573
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 32m 43.65s[1]
Declination +10° 58 05.9[1]
Apparent magnitude (V) 7.215
Characteristics
Spectral type G5& IV-V[2]
B−V color index 0.656[3]
Astrometry
Distance30.24[3] pc
Absolute magnitude (MV)4.82[3]
Details[3]
Surface gravity (log g)4.42±0.01 cgs
Temperature5,757±10 K
Metallicity0.00±0.01
Age7.1+4.2
−4.5
 Gyr
Other designations
BD+11° 2816, HIP 76114, SAO 101603
Database references
SIMBADdata

HD 138573 is a G-type main-sequence star in the constellation Serpens, class G5IV-V, roughly 100.8 light-years from Earth (30.912 parsecs).[1][2] Though a G-type star like the Sun, a 2005 study found that it is not a solar twin as HD 138573 has a much lower mass, lower metallicity, and is much older age than the Sun at 5.6 billion years old. HD 138573 is otherwise close to the Sun's characteristics and could be classed as a Solar analog.[4]

Mahdi et al. (2016) named the star the best solar twin candidate out of their dataset of around 2,800 candidates.[3]

See also

Sun comparison

Chart compares the Sun to HD 138573.

Identifier


J2000 Coordinates


Distance
(ly)


Stellar
Class


Temperature
(K)


Metallicity
(dex)


Age
(Gyr)


Notes


Right ascension


Declination


Sun




0.00


G2V


5,778


+0.00


4.6


[5]


HD 138573 [6]


15h 32m 43.7s +10° 58 06

101

G5IV-V

5,689

−0.10

5.6

[2]

References

  1. 1 2 3 "HD 138573". sky-map.org. 2004. Retrieved 2016-06-23.
  2. 1 2 3 "HD 138573". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-06-23.
  3. 1 2 3 4 5 Mahdi, D.; Soubiran, C.; Blanco-Cuaresma, S.; Chemin, L. (March 2016). "Solar twins in the ELODIE archive". Astronomy & Astrophysics. 587: A131. arXiv:1601.01599. Bibcode:2016A&A...587A.131M. doi:10.1051/0004-6361/201527472. S2CID 119205608.
  4. Datson, Juliet; Flynn, Chris; Portinari, Laura (2012). "New solar twins and the metallicity and temperature scales of the Geneva Copenhagen Survey". Monthly Notices of the Royal Astronomical Society. 426 (426): 484. arXiv:1207.4610. Bibcode:2012MNRAS.426..484D. doi:10.1111/j.1365-2966.2012.21730.x. S2CID 118378819.
  5. Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23.
  6. HD 138573 at SIMBAD - Ids - Bibliography - Image.
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