Jump to content

Narrowband

Tau Cygni - AN's August Double Star of the Month


Recommended Posts

Quite a challenge this one and one for larger scopes! Fairly easy to locate near the North America Nebula, and perfectly positioned at the moment well above the horizon.

The separation is given as about 1 arcsec and the magnitudes 3.9 and 6.8, which I reckoned should be do-able with a 180 Mak.

First try, Tuesday with good seeing (4/5), nearby Delta Cyg was easily split and showing the secondary as a diamond pinprick, while Tau Cyg showed no sign of a secondary. The next evening (Wed), I got the faintest hint of something in about the right place, and third try (last night seeing 4.5/5) there it was in moments of good seeing at x270 and x450. Clearly separated from the primary, but messed up a bit by the diffraction pattern causing to hop in and out of view, as the secondary lies close to the first diff ring. I can't sketch very well, but the Aberrator simulation below is a fairly accurate eyepiece view at x450.

A good one to try if you are bored with looking for some detail on Mars!

Chris

 

 

 

taucygsimulation.jpg

  • Like 10
Link to comment
Share on other sites

  • 1 year later...

Hi all,

I made this picture from Tau Cygni few days ago:

LZOS refractor 152/1200 - ZWO ASI 290MM - barlow TV 3X

38 frames stacked /1000frames : 7 pixels with 0.15 arcsec/p about 1" separation.

2020-07-08-2229_0-CapObj__100r_T24_38_reg.png.35c8773520e7eb494a05793885798ab4.png.61322df589abdc9bf4daf7a2766f089f.png

http://www.astrosurf.com/blogs/entry/228-observations-visuelles-dédoublement-de-lambda-cygne-et-tau-cygne/

 

 

Edited by STF8
  • Like 1
Link to comment
Share on other sites

1 hour ago, STF8 said:

Hi all,

I made this picture from Tau Cygni few days ago:

LZOS refractor 152/1200 - ZWO ASI 290MM - barlow TV 3X

38 frames stacked /1000frames : 7 pixels with 0.15 arcsec/p about 1" separation.

2020-07-08-2229_0-CapObj__100r_T24_38_reg.png.35c8773520e7eb494a05793885798ab4.png.61322df589abdc9bf4daf7a2766f089f.png

http://www.astrosurf.com/blogs/entry/228-observations-visuelles-dédoublement-de-lambda-cygne-et-tau-cygne/

 

 

Very nice!

Chris

  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.