XO-5

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Template:Short description

XO-5 / Absolutno
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 12.13±0.03[3]
Characteristics
Spectral type G8V[3] + M[4]
Apparent magnitude (V) 12.13±0.03[3]
Apparent magnitude (R) 11.844[5]
Apparent magnitude (J) 10.774±0.019[6]
Apparent magnitude (H) 10.443±0.021[6]
Apparent magnitude (K) 10.345±0.018[6]
Astrometry
Radial velocity (Rv)−9.47±0.65[2] km/s
Proper motion (μ) RA: −21.509(18) mas/yr[2]
Dec.: −23.910(13) mas/yr[2]
Parallax (π)3.6517±0.0173 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)5.06±0.12[7]
Details
Mass1.04±0.03[8] M☉
Radius1.13±0.03[8] R☉
Luminosity0.88±0.09[7] L☉
Surface gravity (log g)4.35±0.02[8] cgs
Temperature5430±70[8] K
Metallicity [Fe/H]+0.05±0.06[7] dex
Rotational velocity (v sin i)0.7±0.5[7] km/s
Age7.0±7.0[9] Gyr
Other designations
Template:Odlist, UCAC2 45499774[10]
Database references
SIMBADdata
Exoplanet Archivedata

XO-5, formally named Absolutno, is a likely binary star system, made up of a G-type dwarf and a red dwarf companion, located approximately 893 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][7]

XO-5 has a suspected red dwarf companion with a temperature of 3500+250
−150 K, on a wide orbit.[4] A 2024 study also identified it as a very likely binary star, with 94% probability.[11]

The name Absolutno 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 Czech sci-fi novel Továrna na absolutno (The Factory for the Absolute).[12][13]

Planetary system

File:Exoplanet Comparison XO-5 b.png
Size comparison of XO-5 b and Jupiter

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.[14]

The XO-5 planetary system[8][note 1]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination
(°) 		Radius
b / Makropulos 1.19±0.03 MJ 0.0515±0.0005 4.1877558(6) 0 86.8±0.2 1.14±0.03 RJ

Notes

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  1. ^ eccentricity is insignificant compared to its uncertainties[7]

References

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  1. ^ Template:Cite constellation
  2. ^ a b c d e Template:Cite Gaia DR3
  3. ^ a b c d e Page Module:Citation/CS1/styles.css has no content.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. ^ a b Page Module:Citation/CS1/styles.css has no content.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
  5. ^ Page Module:Citation/CS1/styles.css has no content.Zacharias; et al. (2009). "3UC===259-099032". Third U.S. Naval Observatory CCD Astrograph Catalog. Retrieved 2012-02-21.
  6. ^ a b c Page Module:Citation/CS1/styles.css has no content.Cutri; et al. (2003). "2MASS===07465196+3905404". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-20.
  7. ^ a b c d e f Page Module:Citation/CS1/styles.css has no content.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.
  8. ^ a b c d e Page Module:Citation/CS1/styles.css has no content.Smith, A. M. S. (March 2015). "The Properties of XO-5b and WASP-82b Redetermined Using New High-Precision Transit Photometry and Global Data Analyses". Acta Astronomica. 65: 117. arXiv:1412.0451. Bibcode:2015AcA....65..117S.
  9. ^ Page Module:Citation/CS1/styles.css has no content.Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
  10. ^ Page Module:Citation/CS1/styles.css has no content."GSC 02959-00729". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-26. {{cite web}}: Invalid |mode=Script error: No such module "Citation mode". (help)
  11. ^ Page Module:Citation/CS1/styles.css has no content.Jing, Yingjie; Mao, Tian-Xiang; Wang, Jie; Liu, Chao; Chen, Xiaodian (2025). "Half a Million Binary Stars Identified from the Low-resolution Spectra of LAMOST". The Astrophysical Journal Supplement Series. 277 (1): 15. arXiv:2411.03994. Bibcode:2025ApJS..277...15J. doi:10.3847/1538-4365/ada895. Note: See external tables
  12. ^ Page Module:Citation/CS1/styles.css has no content."Approved names". NameExoworlds. Retrieved 2020-01-02.
  13. ^ Page Module:Citation/CS1/styles.css has no content."International Astronomical Union | IAU". www.iau.org. Archived from the original on 2022-12-05. Retrieved 2020-01-02.
  14. ^ Page Module:Citation/CS1/styles.css has no content.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.

Template:Stars of Lynx

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