Rope 1 Gruis
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Star τ 1 Gruis |
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| AladinLite | |||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | crane | ||||||||||||||||
| Right ascension | 22 h 53 m 37.93 s | ||||||||||||||||
| declination | -48 ° 35 ′ 53.8 ″ | ||||||||||||||||
| Apparent brightness | 6.03 mag | ||||||||||||||||
| Typing | |||||||||||||||||
| Known exoplanets | 1 | ||||||||||||||||
| B − V color index | +0.62 | ||||||||||||||||
| U − B color index | +0.19 | ||||||||||||||||
| Spectral class | G3 IV | ||||||||||||||||
| Astrometry | |||||||||||||||||
| Radial velocity | (−0.8 ± 0.3) km / s | ||||||||||||||||
| parallax | (30.66 ± 0.39) mas | ||||||||||||||||
| distance | (106.4 ± 1.4) ly (32.62 ± 0.41) pc |
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| Visual absolute brightness M vis | +3.46 mag | ||||||||||||||||
| Proper movement | |||||||||||||||||
| Rec. Share: | (217.04 ± 0.37) mas / a | ||||||||||||||||
| Dec. portion: | (−81.76 ± 0.29) mas / a | ||||||||||||||||
| Physical Properties | |||||||||||||||||
| Dimensions | 1.25 M ☉ | ||||||||||||||||
| radius | (2.0 ± 0.7) R ☉ | ||||||||||||||||
| Luminosity |
approx. 4 L ☉ |
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| Effective temperature | 5767 K | ||||||||||||||||
| Metallicity [Fe / H] | 0.15 | ||||||||||||||||
| Age | 5.27 x 10 9 a | ||||||||||||||||
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Other names and catalog entries |
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τ 1 Gruis (alternatively also Tau 1 Gruis or Tau1 Gruis ) is a star system in the constellation Crane , which is 109 light years away from Earth and consists of a star and at least one exoplanet .
The star
τ 1 Gruis has about 1.25 times the mass of our sun and is a yellow-orange dwarf star whose spectral class is G0-G3. The star's diameter is about twice that of the sun and its luminosity is about four times that of the sun.
The planet
The exoplanet orbiting the star is denoted by τ 1 Gruis b , has at least 1.23 times the mass of Jupiter (other sources speak of at least 1.49 Jupiter's masses) and takes more than three and a half years to orbit the star.