WASP-7
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 44m 10.2190s[1] |
| Declination | -39° 13′ 30.894″[1] |
| Apparent magnitude (V) | 9.51 |
| Characteristics | |
| Spectral type | F5V[1] |
| Apparent magnitude (B) | ~9.96[1] |
| Apparent magnitude (V) | ~9.54[1] |
| Apparent magnitude (J) | 8.648 ±0.027[1] |
| Apparent magnitude (H) | 8.414 ±0.042[1] |
| Apparent magnitude (K) | 8.396 ±0.023[1] |
| Astrometry | |
| Proper motion (μ) | RA: 29.20[1] mas/yr Dec.: -61.00[1] mas/yr |
| Distance | 456 ±49 ly (140 ±15 pc) |
| Details | |
| Mass | 1.28 −0.19+0.09 M☉ |
| Radius | 1.236 −0.046+0.059 R☉ |
| Temperature | 6400 ±100 K |
| Metallicity | 0 ±0.1 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
WASP-7, also identified as HD 197286, is a type F star located about 456 light years away in the constellation Microscopium. This star is a little larger and about 28% more massive than the Sun and is also brighter and hotter. At magnitude 9 the star cannot be seen by the naked eye but is visible through a small telescope.[1]
Contents |
[edit] Planetary system
The SuperWASP project announced an extrasolar planet, WASP-7b, orbiting this star in 2008. The planet appears to be another hot Jupiter, a dense planet with Jupiter's mass orbiting very close to a hot star and thus emitting enough heat to shine.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| WASP-7b | 0.96 −0.18+0.12 MJ | 0.0618 −0.0033+0.0014 | 4.954658 −4.3e-05+5.5e-05 | 0 |
[edit] See also
[edit] References
- ^ a b c d e f g h i j k l "SIMBAD query result: HD 197286 -- Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WASP-7. Retrieved 2009-05-06.
- ^ Hellier et al.; Anderson, D. R.; Gillon, M.; Lister, T. A.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J. et al (December 11, 2008). "WASP-7: A BRIGHT TRANSITING-EXOPLANET SYSTEM IN THE SOUTHERN HEMISPHERE". The Astrophysical Journal Letters 690 (1): L89–L91. Bibcode 2009ApJ...690L..89H. doi:10.1088/0004-637X/690/1/L89.
[edit] External links
- "WASP-7". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=WASP-7. Retrieved 2009-05-06.
Coordinates: 
20h 44m 10.2190s, −39° 13′ 30.894″
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