 Alight curve for V807 Andromedae (HD 15082), plotted fromTESS data.[1] The deep minima are caused by the planet transits. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 02h 26m 51.0583s[2] |
| Declination | +37° 33′ 01.736″[2] |
| Apparent magnitude (V) | 8.3[3] |
| Characteristics | |
| Spectral type | A5[4] |
| B−Vcolor 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 asWASP-33) is astar located roughly 397light years away[2] in the northern constellation ofAndromeda.[10] The star is aDelta Scuti variable[11] and a planetary transit variable. Ahot Jupiter typeextrasolar planet, namedWASP-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 anAm star, which makes itsstellar classification challenging to discern. Thehydrogen lines andeffective temperature of the star are similar to spectral type A8, however thecalcium 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] The star is about 100[9] million years old and is spinning with aprojected rotational velocity of 86 km/s.[3] It has 1.55[7] times the mass of the Sun and 1.51 times the Sun's radius.[8]
The intrinsic variability of HD 15082 was discovered in 2011 by Enrique Herreroet al.[3] Delta Scuti variables usually exhibit manypulsation 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 aGamma Doradus variable.[7] This star has the GCVS variable star designationV807 Andromedae.[13]
In 2006, theSuperWASP project announced the discovery of anextrasolar planet, designatedWASP-33b, orbiting the star. The discovery was made by detecting thetransit of the planet as it passes in front of its star, an event which occurs every 1.22 days.[14]
| 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 |
| Stars |
| ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Star clusters |
| ||||||||||||
| Nebulae |
| ||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
| |||||||||||||
