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Appearance move to sidebar hide Coordinates: Sky map 07h 21m 33.1657s, +58° 16′ 05.005″ From Wikipedia, the free encyclopedia Star in the constellation Lynx Not to be confused with the OLPC XO-4 from the One Laptop per Child (OLPC) initiative or the Martin XO-4. 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]
Astrometry
Radial velocity (Rv)1.74±0.33[2] km/s
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[3][5]
Mass1.32±0.02 M☉
Radius1.56±0.05 R☉
Surface gravity (log g)4.18±0.07 cgs
Temperature6397±70 K
Metallicity [Fe/H]−0.04±0.03 dex
Rotational velocity (v sin i)8.8±0.5 km/s
Age2.1±0.6 Gyr
Other designations
Koit, TOI-1721, TIC 51234631, TYC 3793-1994-1, GSC 03793-01994, 2MASS J07213317+5816051[6]
Database references
SIMBADdata
Exoplanet Archivedata

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.[7]

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.[8][9][10]

Planetary system

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One known exoplanet, XO-4b, which is classified as a hot Jupiter, orbits XO-4. This exoplanet was discovered in 2008 by the XO 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.[11] The planetary orbit is misaligned with the stellar rotation.[12]

The XO-4 planetary system[5][note 1]
Companion(in order from star) Mass Semimajor axis(AU) Orbital period(days) Eccentricity Inclination Radius
b / Hämarik 1.612+0.027−0.028 MJ 0.05524+0.00027−0.00028 4.1250823(39) <0.0039 88.7±1.1° 1.34±0.05 RJ

Notes

[edit]
  1. ^ eccentricity approximately equal to zero is expected theoretically and is consistent with the radial velocities and secondary eclipse timing[3][13]

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. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ a b c d e 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 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. ^ a b 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.
  6. ^ "SIMBAD query result: TYC 3793-1994-1 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-26.
  7. ^ 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.
  8. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. ^ "International Astronomical Union | IAU". www.iau.org. Archived from the original on 2022-12-05. Retrieved 2020-01-02.
  10. ^ "Estonia has been assigned its own star and planet". Estonian World. 20 January 2020. Retrieved 2020-01-20.
  11. ^ "Estonia has been assigned its own star and planet". Estonian World. 20 January 2020. Retrieved 2020-01-20.
  12. ^ 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.
  13. ^ 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.
[edit]
  • "XO-4". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-28.
  • v
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Constellation of Lynx
  • List of stars in Lynx
  • Lynx in Chinese astronomy
Stars
Bayer
  • α
  • ψ10 Aur (16)
Flamsteed
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31 (Alsciaukat)
  • 32
  • 33
  • 34
  • 35
  • 36
  • 38
  • 50 Cam
  • 5 LMi
  • 10 UMa
Variable
  • Y
  • RR
  • SW
  • SZ
  • UX
  • BO
  • DU
HR
  • 3028
  • 3612
  • 3809
HD
  • 48948
  • 75898 (Stribor)
Other
  • J0815+4729
  • WASP-13 (Gloas)
  • XO-2
  • XO-4 (Koit)
  • XO-5 (Absolutno)
Exoplanets
  • 6 Lyncis b
  • WASP-13b (Cruinlagh)
  • XO-2Nb
  • XO-4b (Hämarik)
  • XO-5b (Makropulos)
Nebulae
  • Jones-Emberson 1
  • Lynx Arc
Galaxies
NGC
  • 2273
  • 2326
  • 2444
  • 2445
  • 2461
  • 2472
  • 2473
  • 2484
  • 2500
  • 2519
  • 2528
  • 2537
  • 2541
  • 2552
  • 2683
  • 2719
  • 2776
  • 2782
  • 2798
  • 2829
  • 2832
  • 2844
Other
  • 3C 171
  • 3C 186
  • APM 08279+5255
  • B2 0902+34
  • IC 2233
  • IRAS 09104+4109
  • Markarian 382
  • OJ 508
  • UGC 4653
  • UGC 4881
  • UGC 4904
Galaxy clusters
  • 2XMM J083026+524133
  • Abell 569
  • Abell 576
  • Lynx Supercluster
  • NGC 2841 group
Astronomical events
  • SN 2007uy
  • SN 2008D
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Retrieved from "https://en.wikipedia.org/w/index.php?title=XO-4&oldid=1324299546" Categories:
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