Measuring the orbital period of the Moon using a digital camera

Details Measuring the orbital period of the Moon using a digital camera Measuring the orbital period of the Moon using a digital camera

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phyed..41..144h&link_type=abstract

Physics Education, Volume 41, Issue 2, pp. 144-150 (2006).

Physics

Physics Education

1

Scientific paper

A method of measuring the orbital velocity of the Moon around the Earth using a digital camera is described. Separate images of the Moon and stars taken 24 hours apart were loaded into Microsoft PowerPoint and the centre of the Moon marked on each image. Four stars common to both images were connected together to form a 'home-made' constellation. On each image the Moon and constellation were grouped together. The group from one image was pasted onto the other image and translated and rotated so that the two constellations overlay each other. The distance between the Moon centres in pixels was converted into a physical distance on the CCD chip in order to calculate the angular separation on the sky. The angular movement was then used to calculate the orbital period of the Moon. A metre rule was photographed from a known distance in order to calculate the physical size of the CCD pixels. The orbital period of the Moon was measured as 27.1 days, which is within 0.7% of the actual period of 27.3 days.

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