New Naked Eye Comet - 17/P Holmes

Dave,

I may be preaching to the wise on this but if you know the image scale with the camera, ie arcsec per pixel, then you can measure the angular distance from an image and use this with the published distance to the object in the small angle formula

astronomyonline.org/Science/SmallAngleFormula.asp

Tuttle might as well just give up!

Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.

Hi Kieran,
For my SCT setup its even more painful then that as the arc second per pixel is not a constant, it changes depending on the distance between the back of the scope and the camera, the only way I'd be able to figure the FOV of the image is to open starrynight for that FOV and measure it, I'll get around to doing that during the week maybe.

Dave,

Who said astronomy was a hobby, sometimes you have to work at it :lol: . In the Dob is it not starting to blind you?

Tuttle might as well just give up!

Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.

Then I take that back. Lets hope that a nice wide field shot opportunity beckons with my 300mm lens!

Tuttle might as well just give up!

Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.

Or wait further until the 3rd of May when it encounters M38