CWISE J1249+3621
Videos
CWISE J1249+362 is a low-mass hypervelocity star about 408 light-years distant in the constellation Canes Venatici. It has an L spectral type and is either a low-mass red dwarf or a high-mass brown dw
UKIRT Hemisphere Survey image, showing the motion of CWISE J1249+362
Brown dwarf
Videos
Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars. Their mass is approximately 13 to 80 times that of Jupi
Artist's concept of a T-type brown dwarf
The smaller object is Gliese 229B, about 20 to 50 times the mass of Jupiter, orbiting the star Gliese 229. It is in the constellation Lepus, about 19 light-years from Earth.
Planets, brown dwarfs, stars (not to scale)
A size comparison between the Sun, a young sub-brown dwarf, and Jupiter. As the sub-brown dwarf ages, it will gradually cool and shrink.