[2] Ernestina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.

[4] In a taxonomic classification based on MOVIS near-infrared colors, the asteroid's preliminary determined Cgx-type was ultimately rejected and its final class changed to "undefined" (U).

[13] In October 2005, a rotational lightcurve of Ernestina was obtained from photometric observations by an international collaboration led by Donald Pray at Carbuncle Hill Observatory (912).

[11] Alternative period determinations in ascending order include: 5.00±0.05 h by Gordana Apostolovska in 2011 (U=2),[4] 5.03654±0.00004 h by Laurent Bernasconi in 2002 (U=3),[14] 5.037±0.0008 h by astronomers at the Palomar Transient Factory in 2010 (U=2),[15] 5.0415±0.0006 h by René Roy in 2017 (U=3),[14] 5.0431±0.0002 h by David Polishook in 2005 (U=3),[16] and 5.07 h by Violeta Ivanova in 2002 (U=3).

[8][9][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1064 and a diameter of 26.92 kilometers based on an absolute magnitude of 10.9.