WASP-72
WASP-72 (also known as CD-30 1019 and officially named Diya) is the primary of a binary star system. It is an F7 class dwarf star, with an internal structure just on the verge of the Kraft break. It is orbited by a planet WASP-72b. The age of WASP-72 is younger than the Sun at 3.55±0.82 billion years.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 44m 09.6098s |
| Declination | −30° 10′ 08.5614″ |
| Apparent magnitude (V) | 10.96 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | F7 |
| Apparent magnitude (B) | 11.54 |
| Apparent magnitude (G) | 10.8378 |
| Apparent magnitude (R) | 10.47 |
| Astrometry | |
| Radial velocity (Rv) | 37.36 km/s |
| Proper motion (μ) | RA: 7.447 mas/yr Dec.: -7.817 mas/yr |
| Parallax (π) | 2.2718 ± 0.0440 mas |
| Distance | 1,440 ± 30 ly (440 ± 9 pc) |
| Orbit | |
| Primary | WASP-72 |
| Companion | WASP-72B |
| Semi-major axis (a) | 0.639±0.003" (281 AU) |
| Details | |
| WASP-72 | |
| Mass | 1.386 M☉ |
| Radius | 1.98 R☉ |
| Temperature | 6250 K |
| Rotational velocity (v sin i) | 6.0±2.1 km/s |
| Age | 3.55±0.82 Gyr |
| WASP-72B | |
| Mass | 0.66±0.02 M☉ |
| Temperature | 4234+80 −81 K |
| Other designations | |
| Database references | |
| SIMBAD | 1019 data |
The primary seems to have UV-opaque matter in the line-of-sight, which may originate from atmosphere escaping from WASP-72b or from an unknown object in the interstellar medium. WASP-72 was named Diya in 2019.
A faint stellar companion WASP-72B was discovered in 2020 at a projected separation of 281 AU. It may still be a false positive, with a probability of 0.02%.
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