The asteroid was first observed as A917 FA at Heidelberg Observatory in March 1917. The body's observation arc begins with its official discovery observation at Simeiz in August 1928.[1]
Naming
This minor planet was named after Jaroslav Grigorevich Neujmin (born 1928), son of the discoverer Grigory Neujmin. The author of the Dictionary of Minor Planet Names leaned about the naming from Ilya Isaakovich Neyachenko and Nikolai Chernykh after whom the asteroids 3845 Neyachenko and 2325 Chernykh were named.[2]
In January 2012, a rotational lightcurve of Jaroslawa was obtained from photometric observations by American astronomer Maurice Clark at Preston Gott Observatory in Lubbock, Texas. Lightcurve analysis gave a long rotation period of 94.432 hours and a high brightness variation of 0.80 magnitude (U=2+).[11] In October 2014, Frederick Pilcher at the Organ Mesa Observatory (G50) in New Mexico, in collaboration with astronomers at Etscorn (719) and Bigmuskie (B88) observatories, obtained a refined period of 97.4 hours with an amplitude of 0.65±0.05 magnitude (U=3-).[13] This result supersedes other measurements by Maurice Clark, Nicolas Esseiva, Raoul Behrend, Laurent Bernasconi, Jean-Gabriel Bosch and Josep Coloma.[15][16] While not being a core slow rotator, with periods above 100 hours, Jaroslawa has a significantly longer period than most minor planets, which typically rotate between 2 and 20 hours once around their axes.
Spin axis and shape
In 2016, a modeled lightcurve using photometric data from various sources was published. It gave a concurring period of 97.278 hours, as well as a spin axis of (236.0°, 75.0°) in ecliptic coordinates (λ, β).[12] All lightcurve observations show a high brightness variation, indicative for an elongated, non-spheroidal shape.
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 15.60 kilometers based on an absolute magnitude of 11.4.[4]
^ abcdUsui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)