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Northern Prairie Star Party Black Nugget Lake September 15, 2012

Northern Prairie Star Party Black Nugget Lake September 15, 2012 . Brian Martin The King’s University College. Three Fundamental “Sciences”. Measuring “Distance”, Position & “Scale”  Astrometry Measuring Brightness and Intensity  Photometry Measuring “Colour”  Spectroscopy.

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Northern Prairie Star Party Black Nugget Lake September 15, 2012

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  1. Northern Prairie Star Party Black Nugget Lake September 15, 2012 Brian Martin The King’s University College

  2. Three Fundamental “Sciences” • Measuring “Distance”, Position & “Scale”  Astrometry • Measuring Brightness and Intensity  Photometry • Measuring “Colour”  Spectroscopy Exciting science that you can do from the back yard!

  3. Astrometry August 29, 2012 H-alpha filter 0.001 s exposure ED80 Atik 314L+ camera TKUCO How big are the lunar features in this image?

  4. Some Math … S R q • The Small Angle Formula Rq* = S where: • R = distance from object • q = angle that the object subtends in the sky • S = distance across the object * Angle in radians

  5. The Scale of Your Telescope • Scale in (seconds of arc)/mm found by: • In the previous image a ED80 telescope was used so the scale is (206265)/(600 mm) = 343.8 “/mm • The Atik 314L+ has 6.45 mm pixels, so each pixel has a scale of 342.8”/mm × 0.00645mm/px = 2.22 “/px when used with the ED80 • By measuring the number of pixels you can measure the angle that an object or feature subtends

  6. 304 px = 1236 km 850 px = 3457 km (0.5% error)

  7. Some other images… • Capuanus Crater: • December 26,2009 • C14, f/11 • Imaging source DMK2104 • 2000 frames • Scale = 0.20”/px • Distance = 0.002523 AU

  8. Apennines (Eratsothenes, Archimedes) • March 1, 2012 • C14, f/7 • Atik 314L+ • 20 frames (0.005 s) • Scale = 0.52”/px • Distance = 0.00262 AU

  9. Jupiter • November 5, 2011 • C14, f/11 • Imaging Source DMK2104 • LRGB (~2000 frames each) • Scale = 0.26”/px

  10. M57 • August 26, 2011 • C14 f/7 • ST7E • LRGB • Scale 1.49”/px • Distance = 2300 ly

  11. M15 • August 21, 2011 • C14 f/7 • ST7E • LRGB • Scale 1.49”/px • Distance = 33 Kly

  12. Photometry – Measuring Changes in Brightness • Intrinsic Variables • dScuti • SX Phe • Novae and Supernovae • Cataclysmic Variables

  13. Capable of doing excellent science! Modest cost (< $2000) Excellent software support Monochrome with no anti-blooming is preferred Pixel size should be carefully matched to image scale – need to oversample Capable of milli-magnitude precision photometry Consumer grade CCD cameras… Atik 314L+ SBIG ST7E

  14. SX Phoenicis Variables • BL Camelopardalis • Average mag 13.1 • Period • 0.0389d • 56 minutes – this is an exciting system to watch!! 40 s integration, C14 f/7 ST7E camera – KAF400 detector

  15. The Light-Curve… November 9, 2009 BL Cam Teff 7730 K Age ~4Ga Metal poor Period shows a Small change over time! November 9, 2009, s (C2-C1) = 0.007 mag

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