1120 Cannonia

1120 Cannonia, provisional designation , is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered by Pelageya Shajn at Simeiz in 1928, it was named after American astronomer Annie Jump Cannon.

Discovery

''Cannonia'' was discovered on 11 September 1928, by Russian astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula. Two days later, it was independently discovered by Grigory Neujmin (also at Simeiz), and ten days later by Eugène Delporte in Belgium. The independent discoveries, however, are not officially acknowledged by the Minor Planet Center.

Orbit and classification

''Cannonia'' is a member of the Flora family (), a giant asteroid family and the largest family of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6  AU once every 3 years and 4 months (1,205 days). Its orbit has an eccentricity of 0.16 and an inclination of 4 ° with respect to the ecliptic.

The body's observation arc begins unusually late at Uccle in January 1946, or nearly 18 years after its official discovery observation.

Physical characteristics

''Cannonia'' is an assumed stony S-type asteroid, according to its family membership.

Rotation period

In November 2004, a rotational lightcurve of ''Cannonia'' was obtained from photometric observations by American astronomer John Menke at his Menke Observatory in Barnesville, Maryland. Lightcurve analysis gave a well-defined rotation period of 3.816 hours with a brightness amplitude of 0.16 magnitude (). An anonymously submitted lightcurve gave a similar period of hours ().

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Cannonia'' measures between 8.1 and 10.8 kilometers in diameter and its surface has an albedo between 0.129 and 0.49.

The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 10.8 kilometers with an absolute magnitude of 12.0.

Naming

This minor planet was named after American astronomer Annie Jump Cannon (1863–1941), who developed a taxonomic system of stellar spectral types at Harvard University, and subsequently classified about 225,000 stars with these types for the Henry Draper Catalog. The official naming citation was mentioned in ''The Names of the Minor Planets'' by Paul Herget in 1955 (). She is also honored by the lunar crater ''Cannon''.

Notes

References

External links

Asteroid Lightcurve Database (LCDB)
query form

)

Dictionary of Minor Planet Names
Google books


– Observatoire de Genève, Raoul Behrend


– Minor Planet Center
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Discoveries by Pelageya Shajn
Named minor planets
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