Science
Astronomy S/N detection

Question Description

I’m studying for my Physics class and don’t understand how to answer this. Can you help me study?

1.  Now consider a real 2.5m telescope. Assume its CCD camera has both a read noise of 10 counts and a dark current of 10 counts/second for every pixel.

a.  The star is observed for 20 seconds and a total of 20,400 counts are recorded from the image and this image is spread over 40 pixels in the CCD camera. What is the S/N of the detection of this star?

b.  What is the S/N if the telescope detects a background nebula that contributes a uniform background of 99 counts in each of the 500 pixels that surround the star image?


Student has agreed that all tutoring, explanations, and answers provided by the tutor will be used to help in the learning process and in accordance with Studypool's honor code & terms of service.

Final Answer

Maxim L (11)
Duke University

Anonymous
The tutor was pretty knowledgeable, efficient and polite. Great service!

Anonymous
Heard about Studypool for a while and finally tried it. Glad I did caus this was really helpful.

Anonymous
Just what I needed… fantastic!

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4