Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_dslr_mirrorlesss.thumb.jpg.5b348d6a5e7f27bdcb79e9356b7fc03b.jpg

cloudsweeper

Coma Doubles With ED80 On GoTo

Recommended Posts

9.50 - sky very clear - Arcturus out on its own.  I had the ES ED80 on the Celestron GoTo mount - very handy, as long as I don't go too close to the zenith!  Aligned on Arcturus.  (I reach targets using SAO numbers in the handset.  If not included, I just aim for something else nearby.)

10.10 - Sigma1657/24Com - 1+(2) visual double, fairly close match, 20" separation.  A lovely sight at x24/3.42deg - the secondary closely to the side ("left"), and nothing else in view.

10.25 - OSigma266 - closely matched binary, 2.1" separation - just split at x160,  fainter one above the other.

10.40 - Sigma1639 - binary, fairly close match,  just 1.8" separation - very tight at x160 (my max with the ED80) - the fainter component was diagonally above the primary (to the "left" in my view).

Getting these fairly tight doubles was I believe down to the sharpness of the star images with the quality frac.  It would not have been as easy with the 8SE or the Dob.  (Although higher mag and resolution help there.)

I finished at 10.50 with a quick look at the glob M53 - only a fuzzy patch (x24, 80) in the not-so-dark sky and with a smallish aperture.

Another satisfying and successful session, with a different mix of equipment!

Doug.

 

  • Like 9

Share this post


Link to post
Share on other sites

Very nice to read. I'm thinking of starting the summer recess soon. It's good to know there are still possibilities.

  • Thanks 1

Share this post


Link to post
Share on other sites

Doug,

Thanks for posting.  Can you tell me the SAO numbers of these doubles.  I have my Altair ED 80 on a SW star discovery mount and much prefer to find by SAO number.  Id like to check these ones out.

Steve

Share this post


Link to post
Share on other sites
Posted (edited)


 

1 hour ago, Trikeflyer said:

Doug,

Thanks for posting.  Can you tell me the SAO numbers of these doubles.  I have my Altair ED 80 on a SW star discovery mount and much prefer to find by SAO number.  Id like to check these ones out.

Steve

Steve -

They are 100160, 100583, and 082293.  I strongly recommend The Cambridge Double Star Atlas - it gives these numbers.  I then put them into the handset and reach the targets.  As I said, if they are not in the HS, I aim for something close, then "hop".

The three I saw are all good to view - close (at different mags), with the fainter member at different orientations - very nice.

I was pleased indeed to see the last two, as my mag only goes to x160 (until I get a focal extender on my birthday!), and I am sure I would not have seen clear splits had I been using the Cat or Dob, since they are not as sharp as the frac. (I can squeeze a bit more mag out of it without the exit pupil getting too small.)

Have fun!

Doug.

Edited by cloudsweeper

Share this post


Link to post
Share on other sites
3 hours ago, cloudsweeper said:


 

Steve -

They are 100160, 100583, and 082293.  I strongly recommend The Cambridge Double Star Atlas - it gives these numbers.  I then put them into the handset and reach the targets.  As I said, if they are not in the HS, I aim for something close, then "hop".

The three I saw are all good to view - close (at different mags), with the fainter member at different orientations - very nice.

I was pleased indeed to see the last two, as my mag only goes to x160 (until I get a focal extender on my birthday!), and I am sure I would not have seen clear splits had I been using the Cat or Dob, since they are not as sharp as the frac. (I can squeeze a bit more mag out of it without the exit pupil getting too small.)

Have fun!

Doug.

Thanks Doug,

I agree, I don't even try doubles with the dob because the frac is sharper.  I have a Mak 127 which isn't bad for doubles once its cooled. My weapon of choice though is the frac 80ed is great as it is easy to grab and go and set up on the goto mount. 

I'll look into the Cambridge double star atlas.

Steve

Share this post


Link to post
Share on other sites

ED80s give lovely views of doubles even if the resolution is a bit limited. I have mine on my SkyTee2 along with the Mak 180 and always start with the little frac.

Chris

  • Like 2

Share this post


Link to post
Share on other sites

Which edition of Cambridge have you got.

I have this one which doesn't have the SAO numbers in.

2019-05-21 19.14.00.jpg

Share this post


Link to post
Share on other sites

@wookie1965 - Second Edition - see pics.  The SAO numbers are in the right-hand column of data.  They are very useful  with GoTo, also for locating stars in Stellarium.

Doug.

P1070068.JPG

P1070069.JPG

Share this post


Link to post
Share on other sites

I use SAO numbers most of the time got mine from Eagle Creek.

I use Sissy Haas I have written the numbers in there.

Having a book with them in will be a bonus thanks.

I have just sent for one from Amazon £20 used but in very good condition.

Cheers Paul

  • Like 1

Share this post


Link to post
Share on other sites
25 minutes ago, wookie1965 said:

I use SAO numbers most of the time got mine from Eagle Creek.

I use Sissy Haas I have written the numbers in there.

Having a book with them in will be a bonus thanks.

I have just sent for one from Amazon £20 used but in very good condition.

Cheers Paul

Me too😂

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.