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For the laptop with the same name, see OLPC XO-1.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis[1]
Right ascension 16h 02m 11.847s[2]
Declination +28° 10′ 10.44″[2]
Apparent magnitude (V) 11.19 ± 0.03[3]
Spectral type G1V[3]
Apparent magnitude (B) 11.85 ± 0.04[3]
Apparent magnitude (V) 11.19 ± 0.03[3]
Apparent magnitude (J) 9.939 ± 0.022[4]
Apparent magnitude (H) 9.601 ± 0.017[4]
Apparent magnitude (K) 9.527 ± 0.015[4]
Variable type Planetary transit variable[3]
Proper motion (μ) RA: –17.9 ± 0.7[2] mas/yr
Dec.: 15.2 ± 0.6[2] mas/yr
Distance 561 ± 39[5] ly
(172 ± 12[5] pc)
Absolute magnitude (MV) 5.02+0.14
Mass 1.027+0.057
[5] M
Radius 0.94 ± 0.02[6] R
Luminosity 0.86+0.12
[5] L
Surface gravity (log g) 4.50 ± 0.01[7] cgs
Temperature 5738 ± 65[7] K
Metallicity [Fe/H] –0.06 ± 0.07[7] dex
Rotational velocity (v sin i) 1.1 ± 1.0[7] km/s
Age 1.0+3.1
[5] Gyr
Other designations
TYC 2041-1657-1, GSC 02041-01657, 1SWASP J160211.83+281010.4, BD+28 2507, 2MASS J16021184+2810105[8]
Database references

XO-1 is a magnitude 11 yellow dwarf star located approximately 560 light-years away[5] in the constellation Corona Borealis. XO-1 has a mass and radius similar to the Sun. In 2006 the extrasolar planet XO-1b was discovered orbiting XO-1 by the transit method using the XO Telescope.[3]

Planetary system[edit]

The XO Project is an international team of professional and amateur astronomers which discovered the Jupiter-sized planet orbiting around XO-1. The team, led by Peter McCullough of the Space Telescope Science Institute in Baltimore, includes four amateur astronomers from North America and Europe. The planet was confirmed using the Harlan J. Smith Telescope and Hobby-Eberly Telescope at McDonald Observatory of the University of Texas.[3] An independent confirmation of the planet was made by the SuperWASP project.[9]

Further observations with the NICMOS instrument on board the Hubble Space Telescope detected the presence of water vapor, methane, and carbon dioxide in the atmosphere of XO-1b.[10] However an independent reinvestigation of the same data was unable to reproduce these results.[11]

The XO-1 planetary system[6]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
XO-1b 0.92 ± 0.08 MJ 0.049 ± 0.001 3.94150685 ± 0.00000091 0(assumed) [note 1]

See also[edit]


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


  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 Zacharias, N.; et al. (2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145 (2). 44. arXiv:1212.6182Freely accessible. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. Vizier catalog entry
  3. ^ a b c d e f g h McCullough, P. R.; et al. (2006). "A Transiting Planet of a Sun-like Star". The Astrophysical Journal. 648 (2): 1228–1238. arXiv:astro-ph/0605414Freely accessible. Bibcode:2006ApJ...648.1228M. doi:10.1086/505651. 
  4. ^ a b c Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. Vizier catalog entry
  5. ^ a b c d e f g Torres, Guillermo; et al. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal. 677 (2): 1324–1342. arXiv:0801.1841Freely accessible. Bibcode:2008ApJ...677.1324T. doi:10.1086/529429. 
  6. ^ a b Burke, Christopher J.; et al. (2010). "NICMOS Observations of the Transiting Hot Jupiter XO-1b". The Astrophysical Journal. 719 (2): 1796–1806. arXiv:1006.1953Freely accessible. Bibcode:2010ApJ...719.1796B. doi:10.1088/0004-637X/719/2/1796. 
  7. ^ a b c d Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268Freely accessible. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. 
  8. ^ "SIMBAD query result: TYC 2041-1657-1 -- Variable Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-24. 
  9. ^ Wilson, D. M.; et al. (2006). "SuperWASP Observations of the Transiting Extrasolar Planet XO-1b". The Publications of the Astronomical Society of the Pacific. 118 (847): 1245–1251. arXiv:astro-ph/0607591Freely accessible. Bibcode:2006PASP..118.1245W. doi:10.1086/507957. 
  10. ^ Tinetti, G.; et al. (2010). "Probing the Terminator Region Atmosphere of the Hot-Jupiter XO-1b with Transmission Spectroscopy". The Astrophysical Journal Letters. 712 (2): L139–L142. arXiv:1002.2434Freely accessible. Bibcode:2010ApJ...712L.139T. doi:10.1088/2041-8205/712/2/L139. 
  11. ^ Gibson, N. P.; et al. (2011). "A new look at NICMOS transmission spectroscopy of HD 189733, GJ-436 and XO-1: no conclusive evidence for molecular features". Monthly Notices of the Royal Astronomical Society. 411 (4): 2199–2213. arXiv:1010.1753Freely accessible. Bibcode:2011MNRAS.411.2199G. doi:10.1111/j.1365-2966.2010.17837.x. 

External links[edit]

Coordinates: Sky map 16h 02m 12s, +28° 10′ 11″