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Exoplanet List of exoplanets
Exoplanet Comparison WASP-11-HAT-P-10 b.png
Size comparison of WASP-11b/HAT-P-10b with Jupiter.
Parent star
Star WASP-11/HAT-P-10[1]
Constellation Perseus
Right ascension (α) 03h 09m 28.5432s[2]
Declination (δ) +30° 40′ 24.853″[2]
Apparent magnitude (mV) 11.89
Distance440±30[2] ly
(130±10[2] pc)
Spectral type K3V[3]
Orbital elements
Semi-major axis(a) 0.0439+0.0006
[4] AU
Eccentricity (e) 0[4]
Orbital period(P) 3.7224690 ± 0.0000067[4] d
Inclination (i) 88.5 ± 0.6[4]°
Time of transit (Tt) 2454729.90631 ± 0.00030[4] JD
Semi-amplitude (K) 69.1 ± 3.5[4] m/s
Physical characteristics
Mass(m)0.460 ± 0.028[4] MJ
[4] RJ
Density(ρ)498 ± 64[4] kg m−3
Surface gravity(g)10.5[4] m/s²
Temperature (T) 1030+26
[4][note 1]
Discovery information
Discovery date April 1, 2008 (announced)
September 26, 2008 (preprints)
Discoverer(s) West et al. (SuperWASP)
Bakos et al. (HATNet)
Discovery method Transit
Discovery site SAAO
Discovery status Independently confirmed
Other designations
WASP-11b, HAT-P-10b
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

WASP-11b/HAT-P-10b or WASP-11Ab/HAT-P-10Ab[5] is an extrasolar planet discovered in 2008. The discovery was announced (under the designation WASP-11b) by press release by the SuperWASP project in April 2008 along with planets WASP-6b through to WASP-15b, however at this stage more data was needed to confirm the parameters of the planets and the coordinates were not given.[6] On 26 September 2008, the HATNet Project's paper describing the planet which they designated HAT-P-10b appeared on the arXiv preprint server.[4] The SuperWASP team's paper appeared as a preprint on the Extrasolar Planets Encyclopaedia on the same day, confirming that the two objects (WASP-11b and HAT-P-10b) were in fact the same, and the teams agreed to use the combined designation.[1]

The planet has the third lowest insolation of the known transiting planets (only Gliese 436 b and HD 17156 b have lower insolation). The temperature implies it falls into the pL class of hot Jupiters: planets which lack significant quantities of titanium(II) oxide and vanadium(II) oxide in their atmospheres and do not have temperature inversions.[7] An alternative classification system for hot Jupiters is based on the equilibrium temperature and the planet's Safronov number.[note 2] In this scheme, for a given temperature, class I planets have high Safronov numbers and tend to be in orbit around cooler host stars, while class II planets have lower Safronov numbers.[8] In the case of WASP-11b/HAT-P-10b, the equilibrium temperature is 1030 K[note 1] and the Safronov number is 0.047±0.003, which means it is located close to the dividing line between the class I and class II planets.[4]

The planet is in a binary star system, the second star is WASP-11 B, with a mass 0.34 ±0.05 of the Sun and a 3483 ±43 temperature.[9]


  1. ^ a b Assumes the planet has zero albedo. Its secondary transit of the planet behind its star has not yet been observed and so the temperature provided is a hypothetical "equilibrium temperature".
  2. ^ The Safronov number is defined as

See also[edit]


  1. ^ a b Schneider, J. "Notes for star WASP-11/HAT-P-10". The Extrasolar Planets Encyclopaedia. Archived from the original on 2008-10-01. Retrieved 2008-09-29.
  2. ^ a b c d Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  3. ^ West, R. G.; et al. (2008). "The sub-Jupiter mass transiting exoplanet WASP-11b". Astronomy and Astrophysics. 502: 395–400. arXiv:0809.4597v1 [astro-ph]. Bibcode:2009A&A...502..395W. doi:10.1051/0004-6361/200810973. Cite uses deprecated parameter |class= (help)
  4. ^ a b c d e f g h i j k l m Bakos, G. Á.; et al. (2009). "HAT-P-10b: A Light and Moderately Hot Jupiter Transiting A K Dwarf". The Astrophysical Journal. 696 (2): 1950–1955. arXiv:0809.4295. Bibcode:2009ApJ...696.1950B. doi:10.1088/0004-637X/696/2/1950.
  5. ^ West, R. G; Collier Cameron, A; Hebb, L; Joshi, Y. C; Pollacco, D; Simpson, E; Skillen, I; Stempels, H. C; Wheatley, P. J; Wilson, D; Anderson, D; Bentley, S; Bouchy, F; Enoch, B; Gibson, N; Hébrard, G; Hellier, C; Loeillet, B; Mayor, M; Maxted, P; McDonald, I; Moutou, C; Pont, F; Queloz, D; Smith, A. M. S; Smalley, B; Street, R. A; Udry, S (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
  6. ^ "WASP Planets". SuperWASP. Retrieved 2016-01-26.
  7. ^ Fortney, J. J.; et al. (2008). "A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres". The Astrophysical Journal. 678 (2): 1419–1435. arXiv:0710.2558. Bibcode:2008ApJ...678.1419F. doi:10.1086/528370.
  8. ^ Hansen, B. M. S. & Barman, T. (2007). "Two Classes of Hot Jupiters". The Astrophysical Journal. 671 (1): 861–871. arXiv:0706.3052. Bibcode:2007ApJ...671..861H. doi:10.1086/523038.
  9. ^ Open Exoplanet Catalogue WASP-11 20b

External links[edit]

Media related to WASP-11b/HAT-P-10b at Wikimedia Commons

Coordinates: Sky map 03h 09m 28.55s, +30° 40′ 24.9″