1955 McMath | Wikipedia audio article


1955 McMath, provisional designation 1963
SR, is a stony Koronis asteroid from the outer region of the asteroid belt, approximately
10 kilometers in diameter. It was discovered on 22 September 1963, by
Indiana University’s Indiana Asteroid Program at its Goethe Link Observatory near Brooklyn,
Indiana, United States. It was later named after solar astronomer
Robert Raynolds McMath.==Orbit and classification==
McMath is a stony S-type asteroid and a member of the Koronis family, which is named after
158 Koronis and consists of about 300 known bodies. It orbits the Sun in the outer main-belt at
a distance of 2.7–3.0 AU once every 4 years and 10 months (1,762 days). Its orbit has an eccentricity of 0.06 and
an inclination of 1° with respect to the ecliptic. The first precovery was taken at Goethe Link
Observatory in 1949, extending the asteroid’s observation arc by 15 years prior to its discovery. The first (unused) observation at Uccle Observatory
dates back to 1936.==Physical characteristics=====Rotation period===
It has a well determined rotation period of 5.574±0.002 hours with a brightness amplitude
of 0.30 in magnitude (U=3). Between 2011 and 2013, three additional lightcurves
with concurring periods of McMath with an amplitude between 0.32 and 0.39 magnitude
were obtained through photometric observations in the R- and S-band at the U.S. Palomar Transient
Factory in California (U=2/3-/2).===Diameter and albedo===
According to the survey carried out by the NEOWISE mission of NASA’s Wide-field Infrared
Survey Explorer, McMath measures 9.8 kilometers in diameter and its surface has a high albedo
of 0.32, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo
for stony members of the Koronis family of 0.24, and calculates a diameter of 10.3 kilometers.==Naming==
This minor planet was named after American solar astronomer Robert Raynolds McMath (1891–1962),
who was also a bridge engineer and businessman. He was a co-donor and the director of the
McMath-Hulbert Observatory in Lake Angelus, Michigan, which was deeded to the University
of Michigan. Under his advice, the NSF chose the site at
Kitt Peak National Observatory for the McMath-Pierce Solar Telescope. From the late 1950s, Robert McMath served
as the first president of Association of Universities for Research in Astronomy and thereafter as
its chairman. The lunar crater McMath is also named in his
and his father’s honour. The approved naming citation was published
by the Minor Planet Center on 1 March 1981 (M.P.C. 5848

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