HD 172051
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 38m 53.40s [1] |
| Declination | −21° 03′ 06.7″ [1] |
| Apparent magnitude (V) | 5.866 |
| Characteristics | |
| Spectral type | G5 V |
| U−B color index | 0.15 |
| B−V color index | 0.65 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +35.6 km/s |
| Proper motion (μ) | RA: -74.85 ± 0.77 [1] mas/yr Dec.: -152.00 ± 0.47 [1] mas/yr |
| Parallax (π) | 76.43 ± 0.47 mas[1] |
| Distance | 42.7 ± 0.3 ly (13.08 ± 0.08 pc) |
| Absolute magnitude (MV) | 5.29 |
| Details | |
| Mass | 1.0 M☉ |
| Radius | 0.86 R☉ |
| Luminosity | 0.65 L☉ |
| Temperature | 5,580 K |
| Age | (4.1–4.8) × 109[2] years |
| Other designations | |
HD 172051 is a main sequence dwarf star in the constellation Sagittarius.
It is located about 42 light years from the Sun and is considered a solar analog. It is similar in mass to the Sun, although it is cooler and has a lower luminosity. Due to this similarity, HD 172051 has been selected as an early target star for both the Terrestrial Planet Finder and Darwin missions, which seek to find an Earth-like extrasolar planet.[3]
The name of this star comes from its identifier in the Henry Draper catalogue.
References
- ^ a b c d e van Leeuwen, F. (2007). "HIP 91438". Hipparcos, the New Reduction. Retrieved 2009-12-12.
- ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link) - ^ "Planet hunters target nearby star". BBC News. 2003-11-07. Retrieved 2006-08-04.
External links
- "HD 172051 -- Star". SIMBAD. Retrieved 2006-08-04.
- "HD 172051 / HR 6998". SolStation. Retrieved 2006-08-04.