The body's observation arc began 10 years prior to its official discovery at Klet Observatory, with a precovery taken at Crimea–Nauchnij in July 1972.
[3] Two rotational lightcurves of Armstrong were obtained from photometric observations made at the Palomar Transient Factory, California, in January and February 2014.
[4][5] The Collaborative Asteroid Lightcurve Link assumes an identical albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its orbital family – and calculates a diameter of 2.9 kilometers, based on a weaker absolute magnitude of 14.87.
[3] This minor planet was named after American astronaut Neil Armstrong, on the occasion of the 30th anniversary of the Apollo 11 mission.
The asteroid's name was suggested by Czech astronomers Jana Tichá, Miloš Tichý and Zdeněk Moravec, who observed it during its 1995-opposition, shortly before being numbered.