[AJames]

Originally Posted by Dennis

Eris was magnitude 18.7 and Pluto, by comparison, was a whoppingly bright 14th magnitude object!

Yep – you’ll see a fair bit of noise, which dark frames can help minmise, provided the dark exposure is taken at the same temperature as the light exposure.

Also, be prepared for trailed stars, as 3 minute exposures can be quite demanding on mounts, especially at focal lengths of 1500mm and over.

Cheers

Dennis

Hi All,
You might like to go to my website, which has the magnitude you mention and a suitable ephemeris for 2008. The next page has for 2009 to 2015.
A general description of Eris is in the earlier pages.
http://homepage.mac.com/andjames/PageEris002.htm

The changes of imaging Eris is probable difficult without a large aperture, dark-skies and good conditions. I know 17th is tough, 18th is possible, 19th unlikely. Suggest doing the pic on the meridian, when Eris is highest in the sky, and at or very near opposition.
Be very interested if you do it. I'e only seen one, and that was made with 1-metre 'scope.

Andrew