WASP-8

WASP-8
Observation data
Epoch J2000      Equinox J2000
Constellation Sculptor
Right ascension 23h 59m 36.070s[1]
Declination −35° 01′ 52.92″[1]
Apparent magnitude (V) 9.9
Characteristics
Spectral type G6
Astrometry
Proper motion (μ) RA: 110.4 ± 1.0[1] mas/yr
Dec.: 9.8 ± 1.1[1] mas/yr
Distance284 ± 23[2] ly
(87 ± 7[2] pc)
Details
Mass0.93 M☉
Radius0.93 R☉
Luminosity0.79 L☉
Temperature5600 K
Age3–5[2] Gyr
Other designations
TYC 7522-505-1, WDS J23596-3502A[3]

WASP-8 is a magnitude 9.9 main sequence yellow dwarf star. It is reported to be a G type star of temperature 5600 K, mass of 0.93 solar masses, radius of 0.93 solar radius, and a luminosity of 0.79 of solar luminosity.

Planetary system

The star is orbited by two known extrasolar planet, designated WASP-8b and WASP-8c. They was cataloged as part of the SuperWASP mission and discovered by the astronomical transit method.[2] WASP-8c has the longest orbital period of any exoplanet discovered by WASP with a period of 4,323 days, over 400 times the period of the second furthest planet, WASP-117b with a period of 10.02 days.

Measurements of WASP-8b's radius and mass give it an estimated density of 2.53 g/cm3, about twice the density of Jupiter

The WASP-8 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.23 MJ 0.0793 8.16 0.3082 88.52° 1.17 RJ
c 9.45 MJ 5.28 4323 — — —

See also

Artist’s impression of a star like WASP-8.

References

  1. 1 2 3 4 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
  2. 1 2 3 4 Queloz, D.; et al. (2010). "WASP-8b: a retrograde transiting planet in a multiple system". Astronomy and Astrophysics. 517. L1. arXiv:1006.5089Freely accessible. Bibcode:2010A&A...517L...1Q. doi:10.1051/0004-6361/201014768.
  3. ↑ "NAME WASP-8 A -- Star in double system". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-29.

External links

Coordinates: 23h 59m 36.07s, −35° 01′ 52.9″


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