XO-5
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 07h 46m 51.9615s[2] |
| Declination | +39° 05′ 40.461″[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] |
| Distance | 893 ± 4 ly (274 ± 1 pc) |
| Absolute magnitude (MV) | 5.06±0.12[7] |
| Details | |
| Mass | 1.04±0.03[8] M☉ |
| Radius | 1.13±0.03[8] R☉ |
| Luminosity | 0.88±0.09[7] L☉ |
| Surface gravity (log g) | 4.35±0.02[8] cgs |
| Temperature | 5430±70[8] K |
| Metallicity [Fe/H] | +0.05±0.06[7] dex |
| Rotational velocity (v sin i) | 0.7±0.5[7] km/s |
| Age | 6.9±6.9[9] Gyr |
| Other designations | |
| Absolutno, TOI-5373, TIC 9155187, GSC 02959-00729, 2MASS J07465196+3905404, UCAC2 45499774[10] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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
[edit]
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]
| 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
[edit]References
[edit]- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 4 5 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.
- 1 2 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
- ↑ Zacharias; et al. (2009). "3UC===259-099032". Third U.S. Naval Observatory CCD Astrograph Catalog. Retrieved 2012-02-21.
- 1 2 3 Cutri; et al. (2003). "2MASS===07465196+3905404". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-20.
- 1 2 3 4 5 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.
- 1 2 3 4 5 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.
- ↑ 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.
- ↑ "GSC 02959-00729". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-26.
- ↑ 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
- ↑ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ↑ "International Astronomical Union | IAU". www.iau.org. Archived from the original on 2022-12-05. Retrieved 2020-01-02.
- ↑ 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.
External links
[edit]- "XO-5". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-28.
