In December 2017, a rotational lightcurveofRockefellia was obtained from photometric observations by Tom Polakis at the Command Module Observatory (V02) in Arizona. Lightcurve analysis gave a rotation periodof6.826±0.004 hours with a low brightness variation of 0.14±0.03magnitude (U=2).[9] The result supersedes tentative period determinations by Pierre Antonini (2009), Stephane Fauvaud (2011) and René Roy (2014), which were of lower quality (U=1/2/1).[11][12][13]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Rockefellia measures (49.146±0.763), (58.75±1.7) and (61.36±0.77) kilometers in diameter and its surface has an albedo of (0.055±0.009), (0.0561±0.003) and (0.051±0.002), respectively.[6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0357 and calculates a diameter of 58.51 kilometers based on an absolute magnitude of 10.4.[11] Alternative mean diameter measurements published by the WISE team include (48.96±16.97 km), (52.127±3.976 km), (54.859±14.983 km) and (55.321±19.554 km) with corresponding albedos of (0.05±0.05), (0.071±0.010) and (0.04±0.03) and (0.042±0.033).[5][11]
On 13 May 2005, an asteroid occultation gave a best-fit ellipse dimension of 59.0 × 59.0 kilometers.[5] These timed observations are taken when the asteroid passes in front of a distant star. However the quality of the measurement is rated poorly. A second, lower rated observation on 23 February 2013, measured an ellipse of 61.0 × 61.0 kilometers.[5]
^ abcMasiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
^ abcUsui, 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)