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XO-4

May 02, 2024

Not to be confused with the OLPC XO-4 from the One Laptop per Child (OLPC) initiative or the Martin XO-4.

XO-4 is a star located approximately 863 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]

XO-4 / Koit
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx[1]
Right ascension 07h 21m 33.1602s[2]
Declination +58° 16′ 05.110″[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: −17.008(12) mas/yr[2]
Dec.: 5.463(12) mas/yr[2]
Parallax (π)3.7812 ± 0.0156 mas[2]
Distance863 ± 4 ly
(264 ± 1 pc)
Details
Mass1.32 ± 0.02[3] M☉
Radius1.56 ± 0.05[3] R☉
Temperature6397 ± 70[3] K
Metallicity [Fe/H]-0.04 ± 0.03[3] dex
Age2.1 ± 0.6[3] Gyr
Other designations
Koit, TYC 3793-1994-1, GSC 03793-01994, 2MASS J07213317+5816051[5]
Database references
SIMBADdata

The star XO-4 is named Koit. The name was selected in the NameExoWorlds campaign by Estonia, during the 100th anniversary of the IAU. Koit is Estonian for dawn, and was named for a character in a folk tale written by Friedrich Robert Faehlmann.[7][8][9]

Planetary system edit

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] It has been named Hämarik, meaning dusk, and referring to a character from the same Faehlmann story featuring Koit.[10]

The XO-4 planetary system[3][11][12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Hämarik 1.72 ± 0.20 MJ 0.0552 ± 0.0003 4.1250823 ± 0.0000039 0(assumed) [note 1] — —

Notes edit

  1. ^ eccentricity approximately equal to zero is expected theoretically and is consistent with the radial velocities and secondary eclipses timing[3][12]

References edit

  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. ^ a b c d 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.
  3. ^ 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 [astro-ph].
  4. ^ a b c Cutri; et al. (2003). "2MASS===07213317+5816051". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-25.
  5. ^ "SIMBAD query result: TYC 3793-1994-1 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-26.
  6. ^ 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. S2CID 119117620.
  7. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  8. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  9. ^ "Estonia has been assigned its own star and planet". Estonian World. 20 January 2020. Retrieved 2020-01-20.
  10. ^ "Estonia has been assigned its own star and planet". Estonian World. 20 January 2020. Retrieved 2020-01-20.
  11. ^ 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. S2CID 2967944.
  12. ^ 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. S2CID 119200344.

External links edit

  • . Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-28.



 

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May 02, 2024
confused, with, olpc, from, laptop, child, olpc, initiative, martin, star, located, approximately, light, years, away, from, earth, lynx, constellation, magnitude, about, cannot, seen, with, naked, visible, through, small, telescope, search, binary, companion,. Not to be confused with the OLPC XO 4 from the One Laptop per Child OLPC initiative or the Martin XO 4 XO 4 is a star located approximately 863 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 XO 4 Koit Observation dataEpoch J2000 Equinox J2000 Constellation Lynx 1 Right ascension 07h 21m 33 1602s 2 Declination 58 16 05 110 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 AstrometryProper motion m RA 17 008 12 mas yr 2 Dec 5 463 12 mas yr 2 Parallax p 3 7812 0 0156 mas 2 Distance863 4 ly 264 1 pc DetailsMass1 32 0 02 3 M Radius1 56 0 05 3 R Temperature6397 70 3 KMetallicity Fe H 0 04 0 03 3 dexAge2 1 0 6 3 Gyr Other designationsKoit TYC 3793 1994 1 GSC 03793 01994 2MASS J07213317 5816051 5 Database referencesSIMBADdata The star XO 4 is named Koit The name was selected in the NameExoWorlds campaign by Estonia during the 100th anniversary of the IAU Koit is Estonian for dawn and was named for a character in a folk tale written by Friedrich Robert Faehlmann 7 8 9 Contents 1 Planetary system 2 Notes 3 References 4 External linksPlanetary system editOne 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 It has been named Hamarik meaning dusk and referring to a character from the same Faehlmann story featuring Koit 10 The XO 4 planetary system 3 11 12 Companion in order from star Mass Semimajor axis AU Orbital period days Eccentricity Inclination Radius b Hamarik 1 72 0 20 M J 0 0552 0 0003 4 1250823 0 0000039 0 assumed note 1 Notes edit eccentricity approximately equal to zero is expected theoretically and is consistent with the radial velocities and secondary eclipses timing 3 12 References edit 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 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR 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 astro ph 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 Donnees 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 S2CID 119117620 Approved names NameExoworlds Retrieved 2020 01 02 International Astronomical Union IAU www iau org Retrieved 2020 01 02 Estonia has been assigned its own star and planet Estonian World 20 January 2020 Retrieved 2020 01 20 Estonia has been assigned its own star and planet Estonian World 20 January 2020 Retrieved 2020 01 20 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 S2CID 2967944 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 S2CID 119200344 External links edit XO 4 Exoplanets Archived from the original on 2016 03 03 Retrieved 2009 04 28 nbsp This main sequence star related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title XO 4 amp oldid 1221006496, wikipedia, wiki, book, books, library,

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