WASP-2
WASP-2 is a binary star system in the Delphinus constellation located about 500 light-years away. The primary is magnitude 12 orange dwarf star, orbited by red dwarf star on wide orbit. The star system shows an infrared excess noise of unknown origin.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Delphinus |
| A | |
| Right ascension | 20h 30m 54.1279s |
| Declination | +06° 25′ 46.338″ |
| Apparent magnitude (V) | +11.98 |
| C | |
| Right ascension | ~20h 30m 54s |
| Declination | ~+06° 25′ 46″ |
| Apparent magnitude (V) | 15.38 |
| Orbit | |
| Primary | WASP-2A |
| Companion | WASP-2B |
| Semi-major axis (a) | 106″ |
| Characteristics | |
| Spectral type | K1.5V + K2-M3 |
| Apparent magnitude (B) | ~13 |
| Apparent magnitude (V) | ~11.98 |
| Apparent magnitude (J) | 10.166±0.027 |
| Apparent magnitude (H) | 9.752±0.026 |
| Apparent magnitude (K) | 9.632±0.024 |
| Astrometry | |
| Proper motion (μ) | RA: 5.936±0.101 mas/yr Dec.: −48.279±0.082 mas/yr |
| Parallax (π) | 6.4980 ± 0.0686 mas |
| Distance | 502 ± 5 ly (154 ± 2 pc) |
| Details | |
| WASP-2A | |
| Mass | 0.843±0.033 M☉ |
| Radius | 0.821±0.013 R☉ |
| Temperature | 5170±60 K |
| Age | 7.6+2.5 −3.3 Gyr |
| WASP-2B | |
| Mass | 0.48 M☉ |
| Temperature | 3523+28 −19 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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