XO-5

XO-5 is a yellow dwarf main sequence star located approximately 910 light-years away from Earth in the Lynx constellation. It has a magnitude of about 12 and cannot be seen with the naked eye but is visible through a small telescope.[3][6]

XO-5 / Absolutno
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx[1]
Right ascension 07h 46m 51.9615s[2]
Declination +39° 05′ 40.4606″[2]
Apparent magnitude (V) 12.13 ± 0.03[3]
Characteristics
Spectral type G8V[3]
Apparent magnitude (V) 12.13 ± 0.03[3]
Apparent magnitude (R) 11.844[4]
Apparent magnitude (J) 10.774 ± 0.019[5]
Apparent magnitude (H) 10.443 ± 0.021[5]
Apparent magnitude (K) 10.345 ± 0.018[5]
Astrometry
Proper motion (μ) RA: −21.525±0.074[2] mas/yr
Dec.: −23.905±0.044[2] mas/yr
Parallax (π)3.5924 ± 0.0503 mas[2]
Distance910 ± 10 ly
(278 ± 4 pc)
Absolute magnitude (MV)5.06 ± 0.12[6]
Details
Mass0.88 ± 0.03[6] M☉
Radius1.08 ± 0.04[6] R☉
Luminosity0.88 ± 0.09[6] L☉
Surface gravity (log g)4.31 ± 0.03[6] cgs
Temperature5370 ± 70[6] K
Metallicity [Fe/H]+0.05 ± 0.06[6] dex
Age14.8 ± 2.0[6] Gyr
Other designations
Absolutno, GSC 02959-00729, UCAC2 45499774, 2MASS J07465196+3905404[7]
Database references
SIMBADdata

XO-5 has a suspected red dwarf companion with a temperature 3500+250
−150 K, on a wide orbit.[8]

Naming

The star XO-5 is named Absolutno. The name was selected in the NameExoWorlds campaign by the Czech Republic, during the 100th anniversary of the IAU. Absolutno is a fictional miraculous substance in the sci-fi novel Továrna na absolutno (The Factory for the Absolute).[9][10]

Planetary system

The exoplanet XO-5b was discovered by the XO Telescope using the transit method in 2008. This planet is classified as a hot jupiter.[3] A search for transit timing variations caused by additional planets was negative.[11]

Size comparison of XO-5 b and Jupiter
The XO-5 planetary system[6][12]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Makropulos 1.059 ± 0.028 MJ 0.0488 ± 0.0006 4.1877545 ± 0.0000016 0[note 1] — —

See also

Notes
  1. eccentricity is insignificant compared to its uncertainties[note 2]

References
  1. 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
  2. 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 DR2 record for this source at VizieR.
  3. Burke, Christopher J.; et al. (2008). "XO-5b: A Transiting Jupiter-sized Planet with a 4 day Period". The Astrophysical Journal. 686 (2): 1331–1340. arXiv:0805.2399. Bibcode:2008ApJ...686.1331B. doi:10.1086/591497. S2CID 14043772.
  4. Zacharias; et al. (2009). "3UC===259-099032". Third U.S. Naval Observatory CCD Astrograph Catalog. Retrieved 2012-02-21.
  5. Cutri; et al. (2003). "2MASS===07465196+3905404". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-20.
  6. Pál, A.; et al. (2009). "Independent Confirmation and Refined Parameters of the Hot Jupiter XO-5b". The Astrophysical Journal. 700 (1): 783–790. arXiv:0810.0260. Bibcode:2009ApJ...700..783P. doi:10.1088/0004-637X/700/1/783. S2CID 18318327.
  7. "GSC 02959-00729". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-26.
  8. Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal, 814 (2): 148, arXiv:1510.08062, Bibcode:2015ApJ...814..148P, doi:10.1088/0004-637X/814/2/148, S2CID 11525988
  9. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  10. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  11. Maciejewski, G.; et al. (2011). "Refining Parameters of the XO-5 Planetary System with High-Precision Transit Photometry" (PDF). Acta Astronomica. 61 (1): 25–35. arXiv:1103.1325. Bibcode:2011AcA....61...25M.
  12. Sada, Pedro V.; et al. (2012). "Extrasolar Planet Transits Observed at Kitt Peak National Observatory". Publications of the Astronomical Society of the Pacific. 124 (913): 212–229. arXiv:1202.2799. Bibcode:2012PASP..124..212S. doi:10.1086/665043. S2CID 29665395.
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