Try with a big buffer, it could be done with a black card.

Displace a little.

Keep us informed about your results.



aeroceu.tripod.com <http://aeroceu.tripod.com/>





-----Original Message-----
From: guide-user@yahoogroups.com [mailto:guide-user@yahoogroups.com] On
Behalf Of nicolaslefau2
Sent: Sunday, December 10, 2006 3:34 PM
To: guide-user@yahoogroups.com
Subject: [guide-user] Re: Can't Find An Object.



hi Mike.



it would be really good if you could tell us were this is.

many strange things can happen while imaging.



as you use a refractor, a ghost reflection (two internal reflections

on the optical surfaces) could be the source of the "nebula".



these ghost images generally require a "bright" star nearby (a

bright star can be a mv10 star if you have a very deep image). is

there such a star in the area?



does the "nebula" show features inside? a ghost reflection is

generally featureless. if there is a "bright" star close it could

also be caused by diffractive structure in your setup. theses

diffractions sometime show radial structures.

it would very interesting that you check that using for example

another optical setup or shifting your field of view to see if

the "nebula" has the same motion that the background sky. ghost

reflections often move the opposite way that the star whereas

diffraction artifacts move with the backgroung sky.



if it moves the same way as the background stars and if you can

image it with a different setup, then you might have found something



good luck



nicolas lefaudeux



--- In guide-user@yahoogroups.com, "Mike Holloway"

<HollowayCometObs@...> wrote:

>

> Thanks. No sir no filters were used. 22x60 sec exposures showed

an

> area which covers my aprox 1' image and would have been much

larger. I

> will post this as soon as I figure out or someone points out what

this

> is. It may be part of something larger which I do not find in the

area

> and is very faint but big. Thanks for your time

> Mike

>

> --- In guide-user@yahoogroups.com, "H.Luethen" <h.luethen@> wrote:

> >

> >

> >

> > Did you use an IR-block filter with your CCD? If not a very red

star

> (eg

> > Mira type) may look like a nebula or faint comet on a CCD image.

> >

> >

> > Hartwig

> >

>

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