6h4m21.462s, −16° 57′ 55.06″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus |
| Right ascension | 06h04m 21.47357s[1] |
| Declination | −16° 57′ 55.1087″[1] |
| Apparent magnitude (V) | 11.35[2] |
| Characteristics | |
| Spectral type | G6V[3] |
| Astrometry | |
| Radial velocity (Rv) | 41.81±0.38[1] km/s |
| Proper motion (μ) | RA: 54.671 mas/yr[1] Dec.: -19.055 mas/yr[1] |
| Parallax (π) | 5.1315 ± 0.0158 mas[1] |
| Distance | 636 ± 2 ly (194.9 ± 0.6 pc) |
| Details | |
| A | |
| Mass | 1.003±0.10[3] M☉ |
| Radius | 1.038±0.038[3] R☉ |
| Luminosity | 0.884[4] L☉ |
| Surface gravity (log g) | 4.5±0.1[3] cgs |
| Temperature | 5,600±150[5] K |
| Metallicity [Fe/H] | −0.230±0.070[5] dex |
| Rotational velocity (v sin i) | 0.90±0.30[5] km/s |
| Age | 11.9+0.8 −3.2[5] Gyr |
| B | |
| Mass | 0.337+0.009 −0.024[6] M☉ |
| Temperature | 3454+10 −25[6] K |
| Other designations | |
WDS J06044-1658AB, TOI-479, TIC 306362738, WASP-49, TYC 5936-2086-1, 2MASS J06042146-1657550[7] | |
| Database references | |
| SIMBAD | A |
| B | |
WASP-49 is a binary star system about 636 light-years (195 parsecs) away in the constellation Lepus. The two stars are separated by 443 AU.[6] The primary is a G-type main-sequence star, with a surface temperature of 5,600 K (5,330 °C; 9,620 °F). WASP-49 is depleted of heavy elements relative to the Sun. It has a metallicity Fe/H index of –0.23, meaning it has 59% the iron level of the Sun.[5]
In 2012, one exoplanet, designated WASP-49b, was discovered around the primary star by a team led by Monika Lendl.[8] This is a hot Jupiter with an equilibrium temperatureof1369±39 K.[8]
In 2017, WASP-49b was found to have an extensive sodium envelope.[3] A study in 2019 using data from the Hubble Space Telescopeinnear-UV found clear absorption features caused by metals, including magnesium and iron. The magnesium and iron gas is not gravitationally bound to the planet, but could be magnetically confined to it.[9][10] The sodium envelope around WASP-49b could be due to an Io-like exomoon.[11][12] This idea, however, is speculative.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.399+0.029 −0.027 MJ |
0.0379+0.0010 −0.0011 |
2.7817387(56) | <0.026 | 84.89±0.19° | 1.115±0.047 RJ |
 | This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it. |
 | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |
