[1] CWISE J1249+362 was first identified in the Backyard Worlds project by the citizen scientists Tom Bickle, Martin Kabatnik, and Austin Rothermich (now astronomer).

The researchers also identify the esdL1 dwarf ULAS J231949.36+044559.5 as an additional candidate hypervelocity star (vtan≈513 km/s) with a low mass.

The researchers say that the object does have a 10% probability to be a high-mass brown dwarf because the evolutionary model does not account for potential systematic biases for old low-temperature sources.

In this scenario CWISE J1249+362 would have been in a tight binary with a massive white dwarf, which would have involved mass transfer in a cataclysmic variable star.

[1] More research that involves a direct measurement of its parallax and additional optical and infrared spectra are needed to narrow down its origin.