[2] The primary was observed at the Southern African Large Telescope (SALT) and the spectrum agrees with an M4V spectral type.

The star shows several features of youth, such as H-alpha emission and likely shallower absorption due to TiO, CaH and FeH.

The researchers use the rotation period to determine an age limit of 120-650 Million years (Myr).

[2] CWISEP J055816.68-450233.6 was first identified as a possible proper motion object by the CatWISE team in 2020 in WISE data and with Spitzer follow-up.

[4] Follow-up observations with Magellan/FIRE showed a near-infrared spectral type of T8.5 and it was mentioned for the first time that it could be a companion to 2MASS J0558 (see table 2).