Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 06m 48.075s [1] |
Declination | +40° 11′ 08.59″ [1] |
Characteristics | |
Spectral type | L1 [2] |
Apparent magnitude (J) | 13.078±0.024 [3] |
Apparent magnitude (H) | 12.260±0.023 [3] |
Apparent magnitude (K) | 11.771±0.018 [3] |
Astrometry | |
Proper motion (μ) |
RA: 438.293
mas/
yr
[1] Dec.: -179.712 mas/ yr [1] |
Parallax (π) | 59.6710 ± 0.1047 mas [1] |
Distance | 54.66 ± 0.10
ly (16.76 ± 0.03 pc) |
Details [4] | |
Radius | 0.92±0.07 RJup |
Luminosity (bolometric) | 0.0002 L☉ |
Temperature | 2300±75 K |
Rotation | 0.37015 d (8.9 hr) |
Rotational velocity (v sin i) | 11.2±2.2 km/s |
Database references | |
SIMBAD | data |
WISEP J190648.47+401106.8 (abbreviated to W1906+40) is an L-type brown dwarf 54.7 light-years (16.8 parsecs) away in the constellation Lyra. [1] It was discovered in 2011, and was the first L-dwarf discovered in the field of view of the Kepler space telescope. [2]
In 2015 it was shown to have on its surface a storm the size of Jupiter's Great Red Spot. The storm rotates around the star roughly every 9 hours and has lasted since at least 2013, when observations of the storm began. [5]
W1906+40 has an intrinsic brightness of 0.02% that of the Sun, a radius of 0.9 times that of Jupiter, and a surface temperature of 2,300 K. The star emits significant flares. [6] [7]