Tau1 Gruis
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Grus |
| Right ascension | 22h 53m 37.9315s |
| Declination | –48° 35′ 53.828″ |
| Apparent magnitude (V) | +6.03 |
| Characteristics | |
| Spectral type | G0V |
| U-B color index | 0.19 |
| B-V color index | 0.62 |
| V-R color index | ? |
| R-I color index | ? |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | –1.1 km/s |
| Proper motion (μ) | RA: +216.70 mas/yr Dec.: –81.49 mas/yr |
| Parallax (π) | 30.04 ± 0.73 mas |
| Distance | 108.58 ly (33.29 pc) |
| Absolute magnitude (MV) | +3.42 |
| Details | |
| Mass | 1.25 M☉ |
| Radius | 2 ± 0.7 R☉ |
| Surface gravity (log g) | 3.49 |
| Luminosity | 3.95 L☉ |
| Temperature | 5767 K |
| Metallicity | 0.15 (141%) |
| Rotation | ? |
| Age | 5.27 × 109 years |
| Other designations | |
Tau1 (τ¹) Gruis (τ¹ Gru) is a yellow dwarf star of spectral type G0V in the constellation of Grus. This star is visible with the naked eye for some people, giving the Bright Star designation as HR 8700. It is over 100 ly away. The star’s Ca-II H line suggests that it is chromospherically inactive, making this age significant older than it was predicted. Some model say that the star is a highly evolved subgiant.
On Nov 2002, this star is found to have a planet Tau1 Gruis b.
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