Lunar Eclipse Feb '08 – Part II

As promised here is a larger view of the moon at totality; just click on the image to see the large version.

_MG_0562-21Feb08-Edit  Click image for a larger view …

Camera
Optics
Focal Length
Focal Ratio
ISO
Autoguiding?
Subs
Total Exposure
Canon 40D (unmodified)
Canon 500 f4 L IS + 1.4 extender
700mm
f8
1250
No
1
4s

 

An eclipse of the moon happens when the Sun, Earth & Moon are lined up, such that the Earth’s shadow falls across the moon. Once the moon is fully in the shadow, light reaching the moon is only that which has passed through the Earth’s atmosphere; since most of the blue is scattered away, the moon starts to appear orange or maybe even red. A quick look at the blue channel of the camera (see below) shows how little blue is reaching the moon. This is a few minutes after totality was reached.

_MG_0562-21Feb08-blue

In the small, rather shaky hand held image below you can see the moon’s position in relation to Regulus (above right) and Saturn (top left corner).

_MG_8746-21Feb08

Unfortunately the cloud swept in very thickly by 3-30am and it was raining shortly afterwards, so I did not have chance to image the second half of the eclipse. I feel very lucky to have seen as much as I did. Got to wait a few years now, for the next one.

 

Technorati tags: , , ,
spacer

Leave a Reply