Coordinates: Sky map 20h 30m 54.130s, +06° 25′ 46.37″

WASP-2

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
WASP-2
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus[1]
A[2]
Right ascension 20h 30m 54.1282s[3]
Declination +06° 25′ 46.341″[3]
Apparent magnitude (V) +11.98[4]
C[a 1]
Right ascension ~20h 30m 54s[2]
Declination ~+06° 25′ 46″[2]
Characteristics
Spectral type K1.5V + K2-M3[5]
Apparent magnitude (J) 10.166±0.027[6]
Apparent magnitude (H) 9.752±0.026[6]
Apparent magnitude (K) 9.632±0.024[6]
Variable type planetary transit[7]
Astrometry
Radial velocity (Rv)−27.70±0.46[3] km/s
Proper motion (μ) RA: 5.631 mas/yr[3]
Dec.: −48.491 mas/yr[3]
Parallax (π)6.5777±0.0270 mas[3]
Distance496 ± 2 ly
(152.0 ± 0.6 pc)
Orbit[8]
PrimaryWASP-2A
CompanionWASP-2B
Semi-major axis (a)106″
Details
WASP-2A
Mass0.843±0.033[9] M☉
Radius0.821±0.013[9] R☉
Luminosity0.507+0.023
−0.029[10] L☉
Surface gravity (log g)4.536±0.015[9] cgs
Temperature5170±60[9] K
Metallicity [Fe/H]0.1±0.2[11] dex
Rotational velocity (v sin i)0.9±0.5[11] km/s
Age7.6+2.5
−3.3[9] Gyr
WASP-2B
Mass0.40±0.02[9] M☉
Temperature3523+28
−19[9] K
Other designations
V357 Del, TOI-5797, TIC 374530847, WASP-2, GSC 00522-01199, 2MASS J20305413+0625463, 1SWASP J203054.12+062546.4, USNO-B1.0 0964-00543604, UCAC2 34018636[12]
Database references
SIMBADA
B
Exoplanet Archivedata

WASP-2 is a binary star system located about 496 light-years away in the Delphinus constellation.[12] The primary is a magnitude 12 orange dwarf star, orbited by a red dwarf star on a wide orbit.[8][13] The star system shows an infrared excess noise of unknown origin.[14]

The primary star hosts one known exoplanet, WASP-2b.[15] Since the planet transits the star, the star is classified as a planetary transit variable and has received the variable star designation V357 Delphini.[7]

Binary star

[edit | edit source]

In 2008 a study was undertaken of fourteen stars with exoplanets that were originally discovered using the transit method through relatively small telescopes. These systems were re-examined with the 2.2 m (87 in) reflector telescope at the Calar Alto Observatory in Spain. This star system, along with two others, was determined to be a previously unknown binary star system. The previously unknown secondary star is a dim magnitude 15 M-type star separated by about 111 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a recalculation of parameters for both the planet and the primary star.[2]

A re-examination of the WASP-2 spectrum in 2015 resulted in the measurement of the stellar companion's temperature as 3513±28 K, and an angular separation of 0.73 arcseconds.[16]

Planetary system

[edit | edit source]

The primary star has one exoplanet, WASP-2b, a hot Jupiter detected by the SuperWASP project in 2006 using the transit method.[15]

The WASP-2 planetary system[11][9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.892±0.027 MJ 0.0308±0.0004 2.15222163(42) <0.013 84.81+0.35
−0.27° 		1.060±0.024 RJ

See also

[edit | edit source]

Notes

[edit | edit source]
  1. ^ The secondary star is identified with a "C" suffix so as to not confuse it with the planetary designation suffix "b".[2]

References

[edit | edit source]
  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Constellation record for this object at VizieR.
  2. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  4. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ a b c d e f g h Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  12. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  16. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).


Retrieved from "http://70.231.62.181/index.php?title=WASP-2&oldid=14555776"