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

2. Equipment used for Measurements – SQM ....
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

3. Equipment used for Measurements – SQM ....
2 0°
SQM-LU
Front
~100 gr
~9 cm
~3 cm
~6.5 cm
Back
User manual:
( )

4. 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: (“Best method available”)

5. Equipment used for Measurements – SQM ....
mag/arcsec2 cd/cm2
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])

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

7. Equipment used for Measurements – SQM ....
Orion
21.4
Mag 6.3
21.6
Mag 6.4
Mag 1,
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

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

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

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