WASP-48
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WASP-48 is a subgiant star about 1400 light-years away. The star is likely older than Sun and slightly depleted in heavy elements. It shows an infrared excess noise of unknown origin,[3] yet has no detectable ultraviolet emissions associated with the starspot activity.[4] The discrepancy may be due to large interstellar absorption of light in interstellar medium for WASP-48.[5] The measurements are compounded by the emission from eclipsing contact binary NSVS-3071474 projected on sky plane nearby,[6] although no true stellar companions were detected by survey in 2015.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 24m 38.9616s[1] |
| Declination | +55° 28′ 23.3317″[1] |
| Apparent magnitude (V) | 11.65±0.14 |
| Characteristics | |
| Spectral type | G0IV |
| Astrometry | |
| Radial velocity (Rv) | -19.740 km/s |
| Proper motion (μ) | RA: 6.141 mas/yr Dec.: -27.969 mas/yr |
| Parallax (π) | 2.1732±0.0213 mas[1] |
| Distance | 1,500 ± 10 ly (460 ± 5 pc) |
| Details[2] | |
| Mass | 1.19±0.04 M☉ |
| Radius | 1.75±0.07 R☉ |
| Surface gravity (log g) | 4.03±0.03 cgs |
| Temperature | 5920±150 K |
| Metallicity | −0.12±0.12 |
| Rotational velocity (v sin i) | 12.2±0.7 km/s |
| Age | 6+5 −4 Gyr |
| Other designations | |
| Gaia DR2 2141754578242371584, TYC 3925-739-1, GSC 03925-00739, 2MASS J19243895+5528233[1] | |
| Database references | |
| SIMBAD | data |
The star is rotating rapidly, being spun up by the tides raised by the giant planet on close orbit.[8]
Planetary system
In 2011 a transiting hot Jupiter planet b was detected.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.98±0.09 MJ | 0.03320±0.00077 | 2.143634±0.000003 | 0 | 80.09+0.69 −0.55° |
1.396±0.051 RJ |
References
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