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Revision as of 03:37, 2 July 2014 by Artman40 (talk | contribs) (→Planetary systems)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)| Observation data Epoch 2000 Equinox 2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 07 48 06.468 |
| Declination | +50° 13′ 32.96″ |
| Apparent magnitude (V) | 11.18 ± 0.03 |
| Characteristics | |
| Spectral type | K0V |
| Apparent magnitude (B) | 11.95 ± 0.11 |
| Apparent magnitude (V) | 11.18 ± 0.03 |
| Apparent magnitude (J) | 9.744 ± 0.022 |
| Apparent magnitude (H) | 9.340 ± 0.026 |
| Apparent magnitude (K) | 9.308 ± 0.021 |
| Astrometry | |
| Proper motion (μ) | RA: -34.7 ± 2.6 mas/yr Dec.: -153.6 ± 2.4 mas/yr |
| Distance | 483 ± 33 ly (148 ± 10 pc) |
| Details | |
| Mass | 0.971 ± 0.034 M☉ |
| Radius | 0.976 −0.016 R☉ |
| Temperature | 5340 ± 32 K |
| Metallicity | 0.44 ± 0.02 dex |
| Age | 6.3 ± 2.4 Gyr |
| Other designations | |
| TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328 | |
XO-2 Is a binary star. It consists of two components XO2-S (Also known as XO-2A) and XO2-N (Also known as XO-2B).
Both of these stars are nearly identical and are cooler Sun-like stars located approximately 480 light-years away from Earth in the Lynx constellation. It has a magnitude of 11 and cannot be seen with the naked eye but is visible through a small telescope. These stars are also notable for their large proper motions.
XO-2N and XO-2S have a separation of approximately 4,600 AU.
Planetary systems
One known exoplanet, XO-N2b (or rarely XO-2Bb), which is classified as a hot Jupiter, was discovered by the XO Telescope using the transit method orbiting XO-2N (XO-2B) in 2007.
Two planets were reported to orbit around XO-2S in 2014. One of them is Jupiter-mass and another has a mass comparable to Saturn.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.259 ± 0.014 MJ | 0.1344 ±0.0025 | 8.157 ± 0.034 | 0.18 ± 0.035 | — | — |
| c | ≥ 1.37 ± 0.053 MJ | 0.4756 ±0.0087 | 20.8 ± 0.034 | 0.1528 ± 0.01 | — | — |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.62 ± 0.02 MJ | 0.0369 ±0.002 | 2.61586178 ± 0.00000075 | 0.045 ± 0.024 | 88.7 ± 1.3° | 0.973 ± 0.03 RJ |
See also
References
- Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. Vizier catalog entry
- ^ Burke, Christopher J.; et al. (2007). "XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary". The Astrophysical Journal. 671 (2): 2115–2128. arXiv:0705.0003. Bibcode:2007ApJ...671.2115B. doi:10.1086/523087.
- ^ "TYC 3413-5-1 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-15.
- ^ Cutri; et al. (2003). "2MASS===07480647+2b5013328". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-01-08.
{{cite web}}: Explicit use of et al. in:|author=(help) - ^ Torres, Guillermo; et al. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal. 677 (2): 1324–1342. arXiv:0801.1841. Bibcode:2008ApJ...677.1324T. doi:10.1086/529429.
- ^ Fernandez, Jose M.; et al. (2009). "The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b". The Astronomical Journal. 137 (6): 4911–4916. arXiv:0903.2687. Bibcode:2009AJ....137.4911F. doi:10.1088/0004-6256/137/6/4911.
- ^ http://arxiv.org/abs/1407.0251. Retrieved 2014-07-02.
{{cite web}}: Missing or empty|title=(help); Text "The GAPS programme with HARPS-N@TNG IV: A planetary system around XO-2S" ignored (help) - Narita, Norio; et al. (2011). "XO-2b: a Prograde Planet with a Negligible Eccentricity and an Additional Radial Velocity Variation". Publications of the Astronomical Society of Japan. 63 (6): L67 – L71. arXiv:1110.6136. Bibcode:2011PASJ...63L..67N. doi:10.1093/pasj/63.6.l67.
- Sing, D. K.; et al. (2011). "Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry". Astronomy and Astrophysics. 527. article number A73. arXiv:1008.4795. Bibcode:2011A&A...527A..73S. doi:10.1051/0004-6361/201015579.
External links
- NASA PlanetQuest: Planet race heats up: 1 month, 32 discoveries
- "XO-2". Exoplanets. Retrieved 2009-04-28.
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