4432 McGraw-Hill

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]

4432 McGraw-Hill
Discovery [1]
Discovered byS. J. Bus
Discovery siteSiding Spring Obs.
Discovery date2 March 1981
Designations
(4432) McGraw-Hill
Named after
McGraw-Hill Telescope [1]
(at Kitt Peak, Arizona)
1981 ER22 · 1964 TV
main-belt [1][2] · (inner)[3]
background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc53.54 yr (19,555 d)
Aphelion2.8975 AU
Perihelion1.8747 AU
2.3861 AU
Eccentricity0.2143
3.69 yr (1,346 d)
188.28°
0° 16m 2.64s / day
Inclination0.4616°
115.15°
246.30°
Physical characteristics
Mean diameter
3.042±0.643 km[5][6]
3.43 km (derived)[3]
inconclusive [3][7]
0.20 (assumed)[3]
0.254±0.224[5][6]
S (assumed)[3]
14.5[1][2]
14.69[3][6][7]

    Orbit and classification

    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]

    Physical characteristics

    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).

    Rotation period

    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]

    Diameter and albedo

    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]

    Naming

    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]

    References
    1. "4432 McGraw-Hill (1981 ER22)". Minor Planet Center. Retrieved 27 May 2018.
    2. "JPL Small-Body Database Browser: 4432 McGraw-Hill (1981 ER22)" (2018-04-23 last obs.). Jet Propulsion Laboratory. Retrieved 27 May 2018.
    3. "LCDB Data for (4432) McGraw-Hill". Asteroid Lightcurve Database (LCDB). Retrieved 27 May 2018.
    4. "Asteroid 4432 McGraw-Hill". Small Bodies Data Ferret. Retrieved 27 May 2018.
    5. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. S2CID 118745497.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    6. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010. (catalog)
    7. Binzel, Richard P.; Xu, Shui; Bus, Schelte J.; Bowell, Edward (September 1992). "Small Main-Belt Asteroid Lightcurve Survey". Icarus. 99 (1): 225–237. Bibcode:1992Icar...99..225B. doi:10.1016/0019-1035(92)90184-9. ISSN 0019-1035.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 May 2018.

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