[1] Emmons has been characterized as a common, stony S-type asteroid by the Pan-STARRS' survey and by the SDSS-based taxonomic system (latter poorly secured; LSQ).
[6][8][9] In September 2002, a rotational lightcurve of Emmons was obtained from photometric observations by astronomers at the Goodsell Observatory (741).
Lightcurve analysis gave a rotation period of 3.028 hours with a brightness amplitude of 0.16 magnitude (U=2).
[7] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Emmons measures 5.578 kilometers in diameter and its surface has an albedo of 0.298,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20, and calculates a diameter of 5.93 kilometers based on an absolute magnitude of 13.5.
From the 1950s to 1963, school children, Boy Scouts, church groups and community organizations visited his North Canton garage, known as "The Star Barn," which he had converted into the area's only planetarium.