How to Measure the Light Pollution? Bülent ASLAN Anadolu University Physics Department Nanoboyut Research Laboratory bilgi@isikkirliligi.org ERASMUS + EU Project: EUROPEAN DARKSKY PROTECTORS Porto Bello Hotel 29-30 October 2016 / Antalya

Equipment used for Measurements – SQM .... http://www.unihedron.com Sky Quality Meter – SQM Clear Sky Detector The SQM measures the darkness of the night sky to provide readings of magnitudes per square arc second

Equipment used for Measurements – SQM .... 2 0° SQM-LU Front ~100 gr ~9 cm ~3 cm ~6.5 cm Back User manual: ( http://www.unihedron.com/projects/darksky/cd/SQM-LU/SQM-LU_Users_manual.pdf )

Unit: Mpsas: Magnitudes per square arcsecond – mag/arcsec2 Equipment used for Measurements – SQM .... Unit: Mpsas: Magnitudes per square arcsecond – mag/arcsec2 Highest value recorded by the producers: 21.80 (“Best method available”)

Equipment used for Measurements – SQM .... mag/arcsec2 cd/cm2 15.1 1000 17.6 100 20.1 10 22.6 1 Brightness Bortle Scale Class Title NELM SQM mag/arcsec2 1 Excellent dark-sky site 7.6–8.0 21.7–22.0 2 Typical truly dark site 7.1–7.5 21.5–21.7 3 Rural sky 6.6–7.0 21.3–21.5 4 Rural/suburban transition 6.1–6.5 20.4–21.3 5 Suburban sky 5.6–6.0 19.1–20.4 6 Bright suburban sky 5.1–5.5 18.0–19.1 7 Suburban/urban transition 4.6–5.0 8 City sky 4.1–4.5 <18.0 9 Inner-city sky 4.0 Using the formula: [value in cd/m2] = 10.8×104 × 10(-0.4*[value in mag/arcsec2]) http://www.unihedron.com/projects/darksky/magconv.php

Equipment used for Measurements – SQM .... ~18 ~19 ~20 ~21 ~22

Equipment used for Measurements – SQM .... Orion 21.4 Mag 6.3 21.6 Mag 6.4 Mag 1, 14.7 Saklıkent, Antalya National Observatory, Antalya Uğur İkizler Mag 3, 16.9 17,2 Kadir 3,3 Mag 5, 19.3 İstanbul University Observatory Korhan Yelkenci, 2009 Mag 7, 22.9

Equipment used for Measurements – SQM .... Computer SQM USB Cable 20°

Equipment used for Measurements – SQM .... 13 June2014 12 July 2014 10 August 2014

Equipment used for Measurements – SQM .... Computer Demonstration!