On 20 March 2019, a follow-up study announcing the discovery of a second UDG lacking dark matter, NGC 1052-DF4, was published.

Initial observations of NGC 1052-DF2 used its surface brightness fluctuation to estimate its distance at 19.0±1.7 Mpc.

[10] A more recent study on NGC 1052-DF2 suggested the previously reported distance of the galaxy may have been greatly exaggerated.

[citation needed] Using five independent methods to estimate distances of heavenly bodies, a team of researchers from the Instituto de Astrofísica de Canarias (IAC) found the correct distance of NGC 1052-DF2 to be 42 million light years (13 MPc), not some 64 million light years (19 MPc) from the Earth.

Follow-up observations using Hubble Space Telescope Advanced Camera for Surveys imaging measured the tip of the red-giant branch distance to NGC 1052-DF2, which IAC researchers detected at 13 Mpc, to be 22.1±1.2 Mpc, consistent with earlier surface brightness fluctuation measurements.