Star trails

Object :	Stars wide fields
Coordinates/Direction :	RA: -, DEC: -
Object size :	-
Object magnitude :	-
More to know :	Star trails, Wikipedia: https://en.wikipedia.org/ wiki/ Star_trail

Star trails: Big Dipper 2025

(Click on the image to get one in full resolution in a new window)

Date :	2025-10-23
Time (UT) :	-

Mount :

Tripod

Lens/telescope :	Tokina AF 20-35 mm f/3.5-4.5(set to fully open)
Corrector/Barlow :	-
Field (FOV) :	84x61^o (20 mm, full frame)
Field (FOV) :	54x37^o (35 mm, full frame)

camera :	Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature:	About 6^o C above surrounding temperature
Film/CCD :	Raw, Cr2
Filter :	none

Control system :

Mount non, Camera by Intervalometer

Exp. time :	169x20 seconds, iso1600, WB 4000K
Image process tool :	StarStax, Irfanview
Processing :	Blending
Weather :	Temperature +8^o C

Site :

Sweden, Stockholm, Björnö Nature reservation. Bortle 4

Comment :

There was a comet up in the sky this night, that was the reason to take some astrophotos. It's very low, just above the trees in background. What's more exiting, we got an enormous Auroa this night. That's the green area lower right you can see in the photo above, it's just started. Never seen anything like that. Here are an animation with this aurora: Aurora at Björnö.

See also the time lapse video from the same photos: YouTube.

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