XO-4
Appearance
Observation data Epoch 2000 Equinox 2000 | |
---|---|
Constellation | Lynx[1] |
Right ascension | 07h 21m 33.1602s[2] |
Declination | +58° 16′ 05.112″[2] |
Apparent magnitude (V) | 10.674 ± 0.019[3] |
Characteristics | |
Spectral type | F5V[3] |
Apparent magnitude (B) | 11.240 ± 0.029[3] |
Apparent magnitude (V) | 10.674 ± 0.019[3] |
Apparent magnitude (J) | 9.667 ± 0.021[4] |
Apparent magnitude (H) | 9.476 ± 0.022[4] |
Apparent magnitude (K) | 9.406 ± 0.023[4] |
Astrometry | |
Proper motion (μ) | RA: −16.989±0.056[2] mas/yr Dec.: 5.310±0.050[2] mas/yr |
Parallax (π) | 3.6392 ± 0.0385 mas[2] |
Distance | 896 ± 9 ly (275 ± 3 pc) |
Details | |
Mass | 1.32 ± 0.02[3] M☉ |
Radius | 1.56 ± 0.05[3] R☉ |
Temperature | 6397 ± 70[3] K |
Metallicity [Fe/H] | -0.04 ± 0.03[3] dex |
Age | 2.1 ± 0.6[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
XO-4 is a star located approximately 896 light-years away from Earth in the Lynx constellation. It has a magnitude of about 11 and cannot be seen with the naked eye but is visible through a small telescope.[3] A search for a binary companion star using adaptive optics at MMT Observatory was negative.[6]
Planetary system
One known exoplanet, XO-4b, which is classified as a hot jupiter, orbits XO-4. This exoplanet was discovered in 2008 by the XO Telescope project using the transit method.[3]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
XO-4b | 1.72 ± 0.20 MJ | 0.0552 ± 0.0003 | 4.1250823 ± 0.0000039 | 0(assumed) [note 1] | — | — |
Notes
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
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 Vizier catalog entry
- ^ a b c d e f g h i j k l m McCullough, P. R.; et al. (2008). "XO-4b: An Extrasolar Planet Transiting an F5V Star". arXiv:0805.2921. Bibcode:2008arXiv0805.2921M.
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(help) - ^ a b c Cutri; et al. (2003). "2MASS===07213317+5816051". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-25.
- ^ "SIMBAD query result: TYC 3793-1994-1 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-26.
- ^ Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv:1305.6548. Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9.
- ^ Narita, Norio; et al. (2010). "The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b". Publications of the Astronomical Society of Japan. 62 (6): L61–L65. arXiv:1008.3803. Bibcode:2010PASJ...62L..61N. doi:10.1093/pasj/62.6.l61.
- ^ a b Todorov, Kamen O.; et al. (2012). "Warm Spitzer Observations of Three Hot Exoplanets: XO-4b, HAT-P-6b, and HAT-P-8b". The Astrophysical Journal. 746 (1). 111. arXiv:1111.5858. Bibcode:2012ApJ...746..111T. doi:10.1088/0004-637X/746/1/111.
External links
- "XO-4". Exoplanets. Retrieved 2009-04-28.