Several rotational lightcurve of Shoemaker were obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) and CS3-Station (U82). Analysis of the best-rated lightcurves gave a well-defined rotation period of 2.5328 hours with a brightness amplitude of 0.13 magnitude (U=3).[a]
In October 2003, photometric observations of Shoemaker by Robert D. Stephens gave a long rotation period of 57.02 hours. After re-measuring the images with newer software and calibration techniques, two mutual occultation and eclipsing events were found, indicating that Shoemaker might be a synchronous binary asteroid with a minor-planet moon orbiting it every 55 hours. Observations in 2010, were difficult due to incomplete coverage and gave an orbital period of 27.39 hours for the secondary. Observations by astronomers at Etscorn Campus Observatory (719) in 2015, did not mention any mutual events.
In June 2017, Warner measured a rotation period of 2.5331±0.0002 hours and an orbital period for the secondary of 44.28 hours at his CS3-Palmer Divide Station in California.[a][b] The binary nature of Shoemaker remains unconfirmed.
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Shoemaker measures 3.18 and 3.22 kilometers in diameter and its surface has an albedo between 0.41 and 0.52, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 4.93 kilometers based on an absolute magnitude of 13.9.
^ abcWarner (2018b) web. Not yet in ADS. Observation 30 June 2017. Rotation period of 2.5331±0.0002 hours with a brightness amplitude of 0.09±0.01 mag. Quality code of 3. Summary figures for (2074) Shoemaker at Collaborative Asteroid Lightcurve Link (CALL)
^ abLightcurve plot of (2074) Shoemaker, Warner (2017), rotation period: 2.5331 hours; and second period (P2) of 44.28 hours. Quality code of 3.
^Lightcurve plot of (2074) Shoemaker, Warner (2015), period: of 2.809 and 2.515 hours. Quality code of 2.