astro.wikisort.org - Asteroid

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 by	S. J. Bus
Discovery site	Siding Spring Obs.
Discovery date	2 March 1981
Designations
MPC designation	(4432) McGraw-Hill
Named after	McGraw-Hill Telescope [1] (at Kitt Peak, Arizona)
Alternative designations	1981 ER22 · 1964 TV
Minor planet category	main-belt [1][2] · (inner)[3] background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	53.54 yr (19,555 d)
Aphelion	2.8975 AU
Perihelion	1.8747 AU
Semi-major axis	2.3861 AU
Eccentricity	0.2143
Orbital period (sidereal)	3.69 yr (1,346 d)
Mean anomaly	188.28°
Mean motion	0° 16m 2.64s / day
Inclination	0.4616°
Longitude of ascending node	115.15°
Argument of perihelion	246.30°
Physical characteristics
Mean diameter	3.042±0.643 km[5][6] 3.43 km (derived)[3]
Synodic rotation period	inconclusive [3][7]
Geometric albedo	0.20 (assumed)[3] 0.254±0.224[5][6]
Spectral type	S (assumed)[3]
Absolute magnitude (H)	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

External links

• 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 diagram · Orbital elements · Physical parameters

На других языках

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[de] (4432) McGraw-Hill

(4432) McGraw-Hill ist ein Hauptgürtelasteroid, der am 2. März 1988 von Schelte John Bus vom Siding-Spring-Observatorium aus entdeckt wurde.

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- [en] 4432 McGraw-Hill

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