200717 - Neowise over Emerald Bay
ASTRO:
type=comet
mag=(3.0-4.6)
distance=(at closest encounter to Earth) 64 M mi
size=5 mi. diameter (est.)
IMAGE:
location=EB backyard boat dock
exposure=DSLR OSC: 1x120s (2m), ISO400
EQUIPMENT:
optics=NIKKOR 55-200mm DX kit zoom, FL=200mm, f/5.6
camera=Nikon D90 (stk)
filter=(none)
mount=simple fixed tripod
SOFTWARE:
acquisition=(in-camera)
processing=Photoshop
click image to enlarge
Note that the Neowise comet and stars in this image are sharply in-focus; but, the landscape (houses, trees and water) are not. This is the result of the image being captured with the camera mounted to a star tracker mount which compensates for the apparent motion of the sky as the Earth rotates underneath it. This 120s (2m) long exposure, was taken with a DSLR camera, and thanks to the tracker, was synchronized to the apparent motion of the sky; not to the fixed landscape.