Sky background magn...
 
Share:
Notifications
Clear all

Sky background magnitude  

  RSS

 Jean
(@jawknee)
Brown Dwarf Customer
Joined: 8 months ago
Posts: 9
April 8, 2021 03:35  

Hi!

Is there a way in APP to know the magnitude of the sky background? I need that info in photons/pixel/second in a formula to estimate the optimal exposure lenght.

Thanks!


ReplyQuote
(@ippiu)
Red Giant Customer
Joined: 2 years ago
Posts: 60
April 8, 2021 20:39  

@jawknee

2 years ago I wondered the same question and i have solved my doubt doing this.

I bought a SQM - L meter (with the narrow 20 degree lense), measure the entire portion of the sky where i'm planning to image and along which the object is going to move, than put the average or any other SQM value into this file: https://drive.google.com/file/d/12PHRpiOoUfQuhpJMR_7-ZNJjo1vTRYNi/view?usp=sharing

Cheers 


ReplyQuote
(@wvreeven)
Galaxy Admin
Joined: 3 years ago
Posts: 801
April 8, 2021 20:49  

@jawknee No there is no such way. Knowing that would require knowledge of the telescope, filters and camera to a level that goes beyond what many people can provide about their own system. Even weather conditions like humidity, transparency and high clouds are influencing this. There are several online resources where you can lookup approximate light pollution levels for your location like

https://www.lightpollutionmap.info/


ReplyQuote
 Jean
(@jawknee)
Brown Dwarf Customer
Joined: 8 months ago
Posts: 9
April 10, 2021 16:09  

@wvreeven Thanks!


ReplyQuote
 Jean
(@jawknee)
Brown Dwarf Customer
Joined: 8 months ago
Posts: 9
April 10, 2021 16:10  

@ippiu Thanks! I'll look into that. 


ReplyQuote
(@cwm2col)
White Dwarf Customer
Joined: 4 months ago
Posts: 21
April 11, 2021 12:03  

@jawknee

Hi Jean,

You can use sharpcap pro to do this. The sensor analysis stores the response of your camera and the smart histogram will allow you to define optimum exposure and gain depending on you sky background. It's really quite good and useful too.


ReplyQuote
Share: