XO-1b

XO-1b / Negoiu
Size comparison of XO-1b with Jupiter.
Discovery
Discovered byPeter R. McCullough et al.[1]
Discovery siteHaleakala Observatory, Hawaii[1]
Discovery date18 May 2006[2]
Transit and Radial velocity[1]
Orbital characteristics
0.04930+0.00091
−0.00096 AU
Eccentricity<0.019[3]
3.94150685±0.00000091[4] d
Inclination88.8 ± 0.2[4]
Semi-amplitude116 ± 9[1]
StarXO-1
Physical characteristics
1.21 ± 0.03[4] RJ
Mass0.913±0.038[3] MJ
Mean density
0.64 ± 0.05 g/cm3 (0.0231 ± 0.0018 lb/cu in)[4]
15.8 ± 1.5 m/s2 (51.8 ± 4.9 ft/s2)[5]

XO-1b is an extrasolar planet approximately 536 light-years away from Earth.

The planet XO-1b is named Negoiu. The name was selected in the NameExoWorlds campaign by Romania, during the 100th anniversary of the IAU. Negoiu is the second highest peak in Romania.[6][7]

In 2006, the XO Project, an international team of professional and amateur astronomers, discovered a Jupiter-sized planet, later named XO-1b, orbiting a Sun-like star.[1] The team, led by Peter R. McCullough of the Space Telescope Science Institute in Baltimore, had four amateur astronomers hailing from North America and Europe.[8] An independent confirmation of the planet was made by the Wide Angle Search for Planets project later that same year.[9]

The XO Project team employed the relatively inexpensive XO Telescope, made from commercial equipment, to search for extrasolar planets.[2] This telescope is on the Hawaiian Island of Maui.[10]

From September 2003 to September 2005, the XO Telescope detected tens of thousands of bright stars. In that time, McCullough's team of amateur astronomers studied a few dozen stars they had previously identified as promising candidates for extrasolar planets. The star XO-1, in particular, was marked as a promising candidate in June 2005. The amateur astronomers observed it from June to July 2005, eventually confirming that a planet-sized object was eclipsing it. McCullough's team then turned to the McDonald Observatory in Texas for information on the object's mass and to confirm it was a planet.[1]

  1. ^ a b c d e f Cite error: The named reference McCullough2006 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference hubblesite was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Bonomo2017 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Burke2010 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Southworth2010 was invoked but never defined (see the help page).
  6. ^ "Approved names". NameExoworlds. Retrieved 2 January 2020.
  7. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2 January 2020.
  8. ^ Cite error: The named reference skyandtelescope was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wilson2006 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference McCullough2005 was invoked but never defined (see the help page).