- 12139 Tomcowling
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main belt asteroid with anorbital period of 1290.3895977days (3.53years ).cite web | url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=12139 | title = JPL Small-Body Database Browser | accessdate = 2008-05-24 | publisher =NASA ] The asteroid was discovered onSeptember 24 ,1960 .References
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