List of lower mass gap objects

In astrophysics, the lower mass gap is a mass range between the maximum mass for a typical neutron star and the minimum mass for a typical black hole, often defined as roughly 2.5–5 solar masses (M☉). A compact object in this mass range often cannot be confidently determined to be a neutron star or a black hole due to uncertainties in measurement and in the maximum mass of a neutron star (the Tolman-Oppenheimer-Volkoff limit).

Source: Wikipedia — List of lower mass gap objects (CC BY-SA 4.0)