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Mirna Kramar, Petra Korlević, Željko Andreić

Analysis of light pollution influence on sky quality in Istria a . k . a . : The “glow in the dark” group. Mirna Kramar, Petra Korlević, Željko Andreić. Light pollution. Serious problem in astronomy, ecology, psychology... Specific categories light trespass over-illumination glare clutter.

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Mirna Kramar, Petra Korlević, Željko Andreić

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  1. Analysis of light pollution influence on sky quality in Istriaa.k.a.: The “glow in the dark” group Mirna Kramar, Petra Korlević, Željko Andreić

  2. Light pollution • Serious problem in astronomy, ecology, psychology... • Specific categories • light trespass • over-illumination • glare • clutter

  3. Sky Quality Meter • sky brightness • mag/arcsec2 • World: • The best: 23.14(Cherry Springs State Park, USA) • The worst: 12(Langhus, Norway)

  4. Sky brightness [mag/arcsec2] • Tičan: 21,0 • Višnjan: 20,7 • Pula: 18,9 • Rt Kamenjak: 21,0 • Premantura: 19,8 • Vodnjan: 19,3 • Savičenta: 21,0 • Kanfanar:20,8

  5. 20:50 21:29 22:13 How fast does the sky dim?

  6. Tičan Višnjan Cloud influence on sky brightness

  7. Inhomogeneity of sky brightness

  8. All-sky imaging • Inox all-sky mirror (spherical) • tripod • Canon EOS 300D / EOS 20D • Lens: 37mm f/4 [Russian] • nice, clear weather...

  9. Sky in Istria • “Istria by night” side-project • EOS 20D: 5min exp, ISO800, [Raw+M]

  10. Tičan&Višnjan Tičan Višnjan

  11. Southern Istrian locations Cape Kamenjak Vodnjan Pula

  12. Middle Istrian locations Kanfanar Savičenta

  13. Main pollutants of Istrian skies • North:Kopar, Trieste, Umag, Novigrad, Poreč... • Middle:Kanfanarcrossroad, Žminj, tobacco factory... • South:Vodnjan, Pula, Premantura, Medulin...

  14. Mapping street lamps in Višnjan • 197 lamps • 1km radius • 168 in 2001 ...with special thanks to Dino :)...

  15. Percentage of lamps by type 2006 2001

  16. Conclusions • Sky brightness: best/worst • Tičan Observatory vs. Višnjan Observatory • Situation in Istria • Višnjan: 85“new” lamps 14 cutoff TO DO • Correct the scale • East coast? • Istria by night  Croatia by night

  17. “If we could see the stars from just one place on Earth, people would never stop going on a pilgrimage to that place for seeing them” ~L. A. Seneca

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