Extrasolar planet List of extrasolar planets
Size comparison of Jupiter (left) with XO-5b (right).
Parent star

<tr> <td colspan="2">Star</td> <td>XO-5</td></tr><tr> <td colspan="2">Constellation</td> <td>Lynx[1]</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>07h 46m 51.959s[2]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+39° 05′ 40.46″[2]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>12.13 ± 0.03[3]</td></tr><tr><td colspan="2">Distance</td><td>848 ± 39[4] ly
(260 ± 12[4] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8V[3]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0488 ± 0.0006[4] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0[note 1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>4.1877545 ± 0.0000016[5] d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>86.7 ± 0.4[4]°</td></tr><tr> <td>Time of transit</td> <td style="text-align: center">(Tt)</td> <td>2454552.67168 ± 0.00029[4] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>144.9 ± 2.0[4] m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>1.059 ± 0.028[4] MJ</td></tr><tr><td>Radius</td><td style="text-align: center">(r)</td><td>1.109 ± 0.050[4] Template:Jupiter radius</td></tr><tr><td>Density</td><td style="text-align: center">(ρ)</td><td>0.96+0.14
[4] g cm-3</td></tr><tr><td>Surface gravity</td><td style="text-align: center">(g)</td><td>22 ± 5[3] m/s²</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>1221 ± 27[4] K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>XO Project[3]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Transit[3]</td></tr><tr> <td colspan="2">Discovery site</td> <td>XO Telescope at Maui, Hawaii[3]</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[3]</td></tr>

XO-5b is an extrasolar planet approximately 850 light years away in the constellation of Lynx. This planet was found by the transit method using the XO Telescope in May 2008. It was also independently discovered by the HATNet Project. The planet has a mass and radius just slightly larger than that of Jupiter. This planet orbits very close to the G-type parent star, as it is typical for transiting planets, classing this as Hot Jupiter. It takes only 4.188 days (or 100.5 hours) to orbit at an orbital distance of 0.0488 AU).[3][4]


  1. Cite error: Invalid <ref> tag; no text was provided for refs named eccentricity


  1. (1987). Identification of a Constellation From a Position. Publications of the Astronomical Society of the Pacific 99 (617): 695–699. Vizier query form
  2. 2.0 2.1 Zacharias et al. (2009). 3UC===259-099032. Third U.S. Naval Observatory CCD Astrograph Catalog. Retrieved 2012-02-21.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 (2008). XO-5b: A Transiting Jupiter-sized Planet with a 4 day Period. The Astrophysical Journal 686 (2): 1331–1340.
  4. 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 (2009). Independent Confirmation and Refined Parameters of the Hot Jupiter XO-5b. The Astrophysical Journal 700 (1): 783–790.
  5. (2012). Extrasolar Planet Transits Observed at Kitt Peak National Observatory. accepted in Publications of the Astronomical Society of the Pacific.

External linksEdit


  • XO-5. Exoplanets. Retrieved 2008-08-06.

Coordinates: Sky map 07h 46m 51.959s, +39° 05′ 40.47″

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