June 3, 1999
The universe is under no obligation to make sense to us, and yet here you are — a collection of atoms that somehow learned to think, to...
Methane Dwarf
Birthday · June 3, 1999
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APOD published June 3, 1999. Full image credits are on the original APOD entry below. A publication-date match, not a photo taken on your date. Independent of NASA.
While hunting through Sloan Sky Survey data in search of distant quasars, Princeton astronomers Xiaohui Fan and Michael Strauss came upon an undiscovered type of object very nearby - now dubbed a methane dwarf. Marked by white lines in this recently released image, the isolated, faint, but extremely red methane dwarf lies only 30 or so light-years away in the constellation Ophiuchus. Intermediate in size between a star and a planet, it is thought to be about 10 to 70 times as massive as Jupiter. The moniker "methane dwarf" was derived from the strong signature of methane gas in the object's spectrum. Along with the red color, the presence of methane (CH4) indicates that this object is cool - cooler than brown dwarfs which lack the strong methane signature yet are the only other known objects in this mass range. Subsequent observations have now raised the total to three detected methane dwarfs, but because they are so difficult to find so far no one knows if they are rare or common in our Galaxy.