Based on the observed infrared emission of the planemos and numerical models of their evolution, the discoverers conclude that one of the planemos is about 14 times as massive as Jupiter, the other about seven, and that they are very young, only about a million years old.
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AnalogSFF,December2007
Likewise, interstellar planemos are very difficult to find with current techniques.
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AnalogSFF,December2007
Direct imaging, the technique used to find Ophi1622, can only see close planemos or those whose temperatures are high enough to emit significant amounts of visible or infrared radiation.
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AnalogSFF,December2007
Young planemos are hot and bright but then cool rapidly, whereas the more massive brown dwarfs start out hotter and cool slower.
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AnalogSFF,December2007
Another technique that can find interstellar planemos is microlensing.
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AnalogSFF,December2007