02h26m51.0583s, +37° 33′ 01.7377″
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 02h26m 51.0583s[2] |
| Declination | +37° 33′ 01.736″[2] |
| Apparent magnitude (V) | 8.3[3] |
| Characteristics | |
| Spectral type | A5[4] |
| B−V color index | 0.27[5] |
| Variable type | δ Sct[3]+Planetary transit variable |
| Astrometry | |
| Radial velocity (Rv) | −9.20±2.8[6] km/s |
| Proper motion (μ) | RA: −0.977(35) mas/yr[2] Dec.: −8.895(34) mas/yr[2] |
| Parallax (π) | 8.2238 ± 0.0327 mas[2] |
| Distance | 397 ± 2 ly (121.6 ± 0.5 pc) |
| Details | |
| Mass | 1.55 ± 0.04[7] M☉ |
| Radius | 1.51[8] R☉ |
| Surface gravity (log g) | 4.3 ± 0.2[3] cgs |
| Temperature | 7,400 ± 200[3] K |
| Metallicity [Fe/H] | 0.1 ± 0.2[7] dex |
| Rotational velocity (v sin i) | 86[3] km/s |
| Age | 100[9] Myr |
| Other designations | |
V807 And, BD+36 489, HD 15082, HIP 11397, SAO 55561, WASP-33, 2MASS J02265106+3733017, Gaia DR2 328636019723252096 | |
| Database references | |
| SIMBAD | data |
HD 15082 (also known as WASP-33) is a star located roughly 397 light years away[2] in the northern constellation of Andromeda.[10] The star is a Delta Scuti variable[11] and a planetary transit variable. A hot Jupiter type extrasolar planet, named WASP-33b or HD 15082b, orbits this star with an orbital period of 1.22 days. It is the first Delta Scuti variable known to host a planet.[12]
HD 15082 is an Am star, which makes its stellar classification challenging to discern. The hydrogen lines and effective temperature of the star are similar to spectral type A8, however the calcium II K line resembles that of an A5 star, and the metallic lines are more similar to an F4 star. The spectral type is written kA5hA8mF4.[7]
Delta Scuti variables usually exhibit many pulsation modes, and HD 15082 is no exception, with 8 measured high frequency p-modes.[11] Another proposed non-radial mode, which could be induced by tidal interactions with the planet, would make this star also a Gamma Doradus variable.[7] This star has the GCVS variable star designation V807 Andromedae. [13]
In 2010, the SuperWASP project announced the discovery of an extrasolar planet, designated WASP-33b, orbiting the star. The discovery was made by detecting the transit of the planet as it passes in front of its star, an event which occurs every 1.22 days.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | < 4.59 MJ | 0.02558 (± 0.00023) | 1.21987089 ± 1.5×10−07 | 0 | 87.67° | 1.438 RJ |
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