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Transit of venus ppt pdf

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Transcript

  • 1. TRANSIT OF VENUS(Venus moving in front of the Sun when viewed from the Earth)Talk by:Aditya RaviSaturday, 27 April 13
  • 2. WARNINGNever look at the sun through a telescope/binoculars/finder scope without aproper solar filter!You not only blind yourself but also may end up damage yourequipment optics.Saturday, 27 April 13
  • 3. WHAT DO YOU MEAN BY“TRANSIT OF VENUS”“When Venus passes directly between earth and the sun, we see the distant planet as a small dotgliding slowly across the face of the sun.”The last transit of Venus occurred June 6th, 2012.  The next pair of Sun-Venus-Earth alignments willbe December 2117 and 2125.If Venus and the earth orbited the sun in the same plane as the sun, transits would happen frequently. However, the orbit of Venus is inclined to the orbit of earth, so when Venus passes between the sunand the earth every 1.6 years, Venus usually is a little bit above or a little bit below the sun, invisiblein the sun’s glare.A similar thing happens with our moon.  Every month the moon passes between the sun and theearth, yet we do not see a solar eclipse every month.  That’s because the moon’s orbit is also slightlyinclined to earth’s orbit, so the new moon is usually a little above or a little below the sun.The pattern of 105.5, 8, 121.5 and 8 years is the pattern followed by these transits in a 243-yearcycle.Saturday, 27 April 13
  • 4. METHODS OFOBSERVING THE SUNA good quality solar filter is requiredObserving VisuallyEye-piece Projection on a board.Photo Credits:Adarsh A.SrivatsaSaturday, 27 April 13
  • 5. REQUIREMENTS FOR IMAGINGTHE TRANSIT OF VENUS/SUNTelescope or a telephoto camera lens with a tripod.A white light neutral density 3.2 filter or H-alpha solar filter or Calcium K filters.A DSLR/Webcam for prime focus photography or cellphone and point and shoot camera for a-focal photography.Saturday, 27 April 13
  • 6. COMPARISON OF IMAGES OF SUN WITHDIFFERENT FILTERSWhite Light ND 3.2 FilterSaturday, 27 April 13
  • 7. COMPARISON OF IMAGES OF SUN WITHDIFFERENT FILTERSH-Alpha Solar FilterImages taken by and credits to: Steven W. RamsdenDirector,Charlie Bates Solar Astronomy ProjectSaturday, 27 April 13
  • 8. COMPARISON OF IMAGES OF SUN WITHDIFFERENT FILTERSCalcium K-Line FiltersSaturday, 27 April 13
  • 9. WHAT I USED DURINGTHE VENUS TRANSITSkywatcher 8” F/5 Newtonian TelescopeBaader ND 3.2 white light solar filter.Canon 500D on prime focus.Skywatcher NEQ-6 Goto MountSolar Tracking Mode OnSaturday, 27 April 13
  • 10. THE PREVIOUS NIGHT WE HADAMAZING TRANSPARENCYSaturday, 27 April 13
  • 11. THE NEXT DAY OUR BESTFRIENDS JOINED US (CLOUDS)Saturday, 27 April 13
  • 12. THE FIRST SHOT CAPTUREDAND THE EXCITEMENT BEGINSSaturday, 27 April 13
  • 13. TECH SPECSThe Baader Solar solar film reduces the intensity ofsunlight by 99.999%Exposure time: 1/4000sISO 100Exposure biasing was used in few images to controlthe brightness of the image.The photos were taken at prime focus hence aperturecant be controlled.Saturday, 27 April 13
  • 14. RESULTSSaturday, 27 April 13
  • 15. RESULTSSaturday, 27 April 13
  • 16. A-FOCAL MOBILE PHONEPHOTOPhotos aretaken bySanathKumar withhis cell-phoneSaturday, 27 April 13
  • 17. Any questions?Hope you enjoyed this presentation.You may also contact me at adityaravi1210@gmail.comSaturday, 27 April 13