177 Irma is a fairly large and dark main belt asteroid . It was discovered by the French brothers Paul Henry and Prosper Henry on November 5, 1877. Paul was credited for this discovery. The meaning of the name Irma is unknown.[ 3]
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico in 2011 gave a light curve with a period of 13.856 ± 0.001 hours and a brightness variation of 0.30 ± 0.03 in magnitude .[ 2]
References
^ a b Yeomans, Donald K., "177 Irma" , JPL Small-Body Database Browser , NASA Jet Propulsion Laboratory , retrieved 6 May 2016 . ^ a b Pilcher, Frederick (April 2012), "Rotation Period Determinations for 31 Euphrosyne, 65 Cybele, 154 Bertha 177 Irma, 200 Dynamene, 724 Hapag, 880 Herba, and 1470 Carla", The Minor Planet Bulletin , vol. 39, no. 2, pp. 57– 60, Bibcode :2012MPBu...39...57P . ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names ISBN 3642297188
External links
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