XO-2
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Double star XO-2 |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | lynx | ||||||||||
| Known exoplanets |
3 |
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| Astrometry | |||||||||||
| parallax | 6.68 ± 0.23 mas | ||||||||||
| distance | 488 ± 15 ly (149 ± 4 pc ) |
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| Individual data | |||||||||||
| Names | N ; S. | ||||||||||
| Observation data: | |||||||||||
| Right ascension | N | 07 h 48 m 06.468 s | |||||||||
| S. | 07 h 48 m 07.4814 s | ||||||||||
| declination | N | + 50 ° 13 ′ 32.96 ″ | |||||||||
| S. | + 50 ° 13 ′ 03.254 ″ | ||||||||||
| Apparent brightness | N | 11,138 mag | |||||||||
| S. | 11,086 likes | ||||||||||
| Typing: | |||||||||||
| Spectral class | N | G9 V | |||||||||
| S. | G9 V | ||||||||||
| B − V color index | N | (0.86) | |||||||||
| S. | (0.84) | ||||||||||
| Physical Properties: | |||||||||||
| Dimensions | N | 0.98 ± 0.02 M ☉ | |||||||||
| S. | 0.982 ± 0.054 M ☉ | ||||||||||
| radius | N | 0.964 ± 0.02 R ☉ | |||||||||
| S. | 1.02 R ☉ | ||||||||||
| Effective temperature | N | 5340 ± 32 K | |||||||||
| S. | 5399 ± 55 K | ||||||||||
| Metallicity [Fe / H] | N | 0.45 ± 0.02 | |||||||||
| S. | 0.39 ± 0.05 | ||||||||||
| Other names and catalog entries |
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XO-2 is a binary star system 486 light years from Earth with the components XO-2S and XO-2N . Both stars are yellow dwarfs and are orbited by exoplanets .
system
| planet | Discovery year |
Mass (in M J ) |
Radius (in R J ) |
Cycle time (in days) |
Major semi-axis (in AU) |
eccentricity |
| Nb | 2007 | 0.62 ± 0.02 | 0.973 ± 0.03 | 2.62 | 0.0369 ± 0.002 | 0.045 ± 0.024 |
| Sb | 2014 | ≥ 0.259 ± 0.014 | 18.157 ± 0.034 | 0.1344 ± 0.0025 | 0.18 ± 0.035 | |
| Sc | 2014 | ≥ 1.37 ± 0.053 | 120.8 ± 0.034 | 0.4756 ± 0.0087 | 0.1528 ± 0.01 |