1928 Summa
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1928 Summa, provisional designation Template:Mp, is a stony asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter.
It was discovered on 21 September 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland.[1] It was named for a Finnish village where the Battle of Summa took place.[2]
Orbit and classification
Summa is a S-type asteroid that orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 11 months (1,423 days). Its orbit has an eccentricity of 0.20 and an inclination of 5° with respect to the ecliptic.[3] The body's observation arc begins at Turku one night after its official discovery observation, with no precoveries taken, and no prior identifications made.[1]
Rotation period
In March 1984, the first but poorly rated rotational lightcurve of Summa was obtained from photometric observations by American astronomer Richard Binzel. It gave a rotation period of 9.66 hours with a brightness amplitude of 0.14 magnitude (U=1Script error: No such module "Check for unknown parameters".).[4]
In August 2012, a refined yet ambiguous lightcurve with a period of 6.855 hours and an amplitude of 0.13 was obtained by Larry E. Owings at the Barnes Ridge Observatory in California (U=2+Script error: No such module "Check for unknown parameters".). Lightcurve analysis also considered that Summa might be a binary system.[5] One month later, the so-far best rated lightcurve from British astronomer Kevin Hills using the remote controlled Riverland Dingo Observatory in Australia, gave a period of 6.8549 hours with a brightness amplitude of 0.18 (U=3Script error: No such module "Check for unknown parameters".).[6]
Diameter an albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Summa measures 9.333 kilometers in diameter and its surface has an albedo of 0.160,[7][8] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.34 kilometers with an absolute magnitude of 12.76.[9]
Naming
This minor planet was named after the village on the Karelian Isthmus, where the Battle of Summa took place during the Finnish Winter War (1939–1940).[2] The approved naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450Script error: No such module "Check for unknown parameters".).[10] Most of Yrjö Väisälä's discoveries have names that relate in one way or another to this military conflict between Finland and the Soviet Union during World War II.
References
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External links
- (1928) Summa Template:Webarchive, lightcurve at Hills Observatory, Kevin Hills
- Kevin Hills, Asteroid hunter realizes life's dreams at GRAS, Remote asteroid hunting from the UK, July 2009
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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