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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.

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Presentation on theme: "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."— Presentation transcript:

1 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

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

3 Sky Quality Meter sky brightness –mag/arcsec 2 World: –The best: 23.14 (Cherry Springs State Park, USA) –The worst: 12 (Langhus, Norway)

4 Sky brightness [mag/arcsec 2 ] 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 How fast does the sky dim? 20:5021:2922:13

6 Tičan Cloud influence on sky brightness Višnjan

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 VodnjanPula Cape Kamenjak

12 Middle Istrian locations KanfanarSavičenta

13 Main pollutants of Istrian skies North: Kopar, Trieste, Umag, Novigrad, Poreč... Middle: Kanfanar c rossroad, 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 2001 2006

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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