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I'm not familiar enough with the math to figure it out, but the footnote for the image mentions the photo is from 21 miles above, and wikipedia [1] reports the
by MaxLeiter 8y ago
I'm not familiar enough with the math to figure it out, but the footnote for the image mentions the photo is from 21 miles above, and wikipedia [1] reports the cameras focal length is 150mm. Is it possible to calculate the relative scale with that?
[1] https://en.wikipedia.org/wiki/Dawn_(spacecraft) https://en.wikipedia.org/wiki/Dawn_(spacecraft)
- deleted 8y ago[deleted]
- perilunar 8y agoYou can calculate the field of view from the focal length, but you need to also know the film/sensor size. However the Wiki article you linked to said the FOV of the framing camera is 5.5° x 5.5°. So at 21 miles, the photos would be about (5.5°/360° ⋅ 2𝛑 ⋅ 21 miles) = 2.0 miles across.
- MaxLeiter 8y agoThat’s 2 miles across each, right? The image in the blog is a montage of images, so now to figure that out...