XO-2
| Doppelstern XO-2 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
  | |||||||||||
| Beobachtungsdaten Äquinoktium: J2000.0, Epoche: J2000.0 | |||||||||||
| AladinLite | |||||||||||
| Sternbild | Luchs | ||||||||||
| Rektaszension | 07h 48m 06s[1] | ||||||||||
| Deklination | +50° 13′ 15″[1] | ||||||||||
| Bekannte Exoplaneten |
3 [2] | ||||||||||
| Astrometrie | |||||||||||
| Parallaxe | 6,68 ± 0.23 mas[1] | ||||||||||
| Entfernung [2] | 488 ± 15 Lj (149 ± 4 pc) | ||||||||||
| Einzeldaten | |||||||||||
| Namen | N; S | ||||||||||
| Beobachtungsdaten | |||||||||||
| Rektaszension[1] | N | 07h 48m 06,468s | |||||||||
| S | 07h 48m 07,4814s | ||||||||||
| Deklination[1] | N | +50° 13′ 32.96″ | |||||||||
| S | +50° 13′ 03.254″ | ||||||||||
| Scheinbare Helligkeit [1] | N | 11,138 mag | |||||||||
| S | 11,086 mag | ||||||||||
| Spektrum und Indices | |||||||||||
| Spektralklasse[1] | N | G9 V | |||||||||
| S | G9 V | ||||||||||
| B−V-Farbindex[1] | N | (0.86) | |||||||||
| S | (0.84) | ||||||||||
| Physikalische Eigenschaften | |||||||||||
| Masse[2] | N | 0,98 ± 0,02 M☉ | |||||||||
| S | 0,982 ± 0,054 M☉ | ||||||||||
| Radius[2] | N | 0,964 ± 0,02 R☉ | |||||||||
| S | 1.02 R☉ | ||||||||||
| Effektive Temperatur[2] | N | 5340 ± 32 K | |||||||||
| S | 5399 ± 55 K | ||||||||||
| Metallizität [Fe/H][2] | N | 0,45 ± 0,02 | |||||||||
| S | 0,39 ± 0,05 | ||||||||||
| Andere Bezeichnungen und Katalogeinträge | |||||||||||
| |||||||||||
XO-2 ist ein 486 Lichtjahre von der Erde entferntes Doppelsternsystem mit den Komponenten XO-2S und XO-2N. Beide Sterne sind gelbe Zwerge und werden von Exoplaneten umkreist.
System
| Planet | Entdeckungsjahr | Masse (in MJ) |
Radius (in RJ) |
Umlaufzeit (in Tagen) |
Große Halbachse (in AE) |
Exzentrizität |
| 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 |
Einzelnachweise
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