4432 McGraw-Hill, provisional designation 1981 ER₂₂, is a background asteroid from the inner regions of the asteroid belt, approximately 3 kilometers (2 miles) in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in Australia. The likely S-type asteroid was named for the McGraw-Hill Telescope located at Kitt Peak, Arizona.^[1]

McGraw-Hill is a non-family asteroid from the main belt's background population.^[4] It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,346 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.21 and an inclination of 0° with respect to the ecliptic.^[2]

The asteroid was first observed as 1964 TV at Purple Mountain Observatory in October 1964. The body's observation arc begins with a precovery taken at Palomar Observatory in February 1977, or four years prior to its official discovery observation at Siding Spring.^[1]

McGraw-Hill is an assumed, stony S-type asteroid,^[3] in agreement with the albedo (see below) obtained by the Wide-field Infrared Survey Explorer (WISE).

During the Small Main-Belt Asteroid Lightcurve Survey, McGraw-Hill has been observed photometrically. The observations gave a small brightness variation of 0.06 magnitude but resulted in no useful rotational lightcurve (U=n.a.).^[7] As of 2018, the body's rotation period, pole and shape remain unknown.^[2]

According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, McGraw-Hill measures 3.042 kilometers in diameter and its surface has an albedo of 0.254,^[5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and derives a diameter of 3.43 kilometers based on an absolute magnitude of 14.69.^[3]

This minor planet was named after the 1.3-meter McGraw-Hill Telescope located at the MDM Observatory at the Kitt Peak National Observatory site in Arizona, United States.^[1] The official naming citation was published by the Minor Planet Center on 18 February 1992 (M.P.C. 19697).^[8]

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 4432 McGraw-Hill at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4432 McGraw-Hill at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters