Timir is an evolved star, late in its life cycle, which has expanded to form a giant or subgiant, reaching a diameter some three times greater than that of the Sun. It has a companion object in a close orbit, of uncertain nature. Originally thought to be a gas giantplanet, later measurements of the mass of this orbiting object (which is at least thirty times that of Jupiter) imply that it is either a brown dwarf or a low-massreddwarfstar. Timir's companion is designated HD 148427 b, and named Tondra.
The name Timir was selected as the entry for Bangladesh in the NameExoWorlds project, and comes from a Bengali word for 'darkness' (referencing that fact that the star lies in the distant darkness of space). The name of its companion Tondra comes from a word meaning 'drowse', suggesting the idea that the companion object was 'sleeping' before its discovery in the year 2009.