Large telescopes often have small fields of view. For example, the Hubble Space
ID: 283006 • Letter: L
Question
Large telescopes often have small fields of view. For example, the Hubble Space Telescope’s (HST’s) advanced camera has a field of view that is roughly square and about 0.06 degree on a side.
1. Calculate the angular area of the HST’s field of view in square degrees.
A. 0.006 Square degrees
B. 0.36 Square degrees
C. 0.0036 Square degrees
D. 0.06 Square degrees
2. The angular area of the entire sky is about 41,250 square degrees. How many pictures would the HST have to take with its camera to obtain a complete picture of the entire sky?
Answer in "N= ?"
Explanation / Answer
1. Calculate the angular area of the HST’s field of view in square degrees.
A. 0.006 Square degrees
B. 0.36 Square degrees
C. 0.0036 Square degrees
D. 0.06 Square degrees
Answer: C. 0.0036 square degrees
Angular area of the HST’s field of view is 0.0036 square degrees
2. The angular area of the entire sky is about 41,250 square degrees. How many pictures would the HST have to take with its camera to obtain a complete picture of the entire sky?
Answer in "N= ?"
The angular area of entire sky is 41, 250 sq. degrees
Angular area field view for one picture = 0.0036 sq. degrees
No of pictures taken in the entire sky = 41250/0.0036 =11, 458, 333
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