| 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 | |
| Distance | 30.24[3] pc |
| Absolute magnitude (MV) | 4.82[3] |
| Details[3] | |
| Surface gravity (log g) | 4.42±0.01 cgs |
| Temperature | 5,757±10 K |
| Metallicity | 0.00±0.01 |
| Age | 7.1+4.2 −4.5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 2 3 "HD 138573". sky-map.org. 2004. Retrieved 2016-06-23.
- 1 2 3 "HD 138573". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-06-23.
- 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.
- ↑ 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.
- ↑ Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23.
- ↑ HD 138573 at SIMBAD - Ids - Bibliography - Image.
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