| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela [1] |
| Right ascension | 09h 53m 40.07656s [2] |
| Declination | −45° 39′ 33.0572″ [2] |
| Apparent magnitude (V) | 12.312 ± 0.017 [3] |
| Characteristics | |
| Spectral type | G8V [4] |
| Apparent magnitude (B) | 13.05 [5] |
| Apparent magnitude (R) | 12.12 [5] |
| Apparent magnitude (I) | 11.35 [5] |
| Apparent magnitude (J) | 10.911 ± 0.026 [6] |
| Apparent magnitude (H) | 10.602 ± 0.022 [6] |
| Apparent magnitude (K) | 10.481 ± 0.023 [6] |
| B−V color index | 1.3[ citation needed ] |
| V−R color index | 0.1[ citation needed ] |
| R−I color index | 0.82[ citation needed ] |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | 21.41±0.95 [2] km/s |
| Proper motion (μ) | RA: −35.457 mas/yr [2] Dec.: 17.378 mas/yr [2] |
| Parallax (π) | 3.7516±0.0090 mas [2] |
| Distance | 869 ± 2 ly (266.6 ± 0.6 pc) |
| Absolute magnitude (MV) | 5.3[ citation needed ] |
| Details [7] | |
| Mass | 0.965+0.091 −0.095 M☉ |
| Radius | 1.006+0.031 −0.034 R☉ |
| Luminosity | 0.905+0.071 −0.069 L☉ |
| Surface gravity (log g) | 4.417+0.020 −0.021 cgs |
| Temperature | 5616+66 −65 K |
| Metallicity [Fe/H] | 0.04+0.25 −0.30 dex |
| Rotation | 11.76±0.09 d [8] |
| Rotational velocity (v sin i) | 4.0 ± 1.0 [9] km/s |
| Age | 6.4+4.1 −3.5 Gyr |
| Other designations | |
| Wattle, TOI-655, TIC 35516889, WASP-19, GSC 08181-01711, 2MASS J09534008-4539330, USNO-B1.0 0443-00193111 [5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-19, formally named Wattle, [10] is a magnitude 12.3 star about 869 light-years (266 parsecs ) away, located in the Vela constellation of the southern hemisphere. [4] This star has been found to host a transiting hot Jupiter-type planet in a tight orbit.
WASP-19 is older than the Sun, has a fraction of heavy elements above the solar abundance, and is rotating rapidly, being spun up by the tides raised by the giant planet on a close orbit. [8]
The designation WASP-19 indicates that this was the 19th star found to have a planet by the Wide Angle Search for Planets.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project. [11] The approved names were proposed by a team from Brandon Park Primary School in Wheelers Hill (Melbourne, Australia), led by scientist Lance Kelly and teacher David Maierhofer [12] and announced in June 2023. WASP-19 is named "Wattle" and its planet is named "Banksia", after the plant genera Wattle (specifically the golden wattle Acacia pycnantha ) and Banksia (specifically the scarlet banksia Banksia coccinea ) respectively. [10]
In December 2009, the SuperWASP project announced that a hot Jupiter type exoplanet, WASP-19b, was orbiting very close to this star and with the shortest orbital period of any transiting exoplanet known at the time. [4]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Banksia | 1.154+0.078 −0.080 MJ | 0.01652+0.00050 −0.00056 | 0.78883852(82) | 0.0126+0.014 −0.0089 | 79.08+0.34 −0.37 ° | 1.415+0.044 −0.048 RJ |
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