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Observing >> Double Star Observing

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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Do you measure double stars?? new [Re: Ed Wiley]
      #5399972 - 09/02/12 05:49 PM Attachment (74 downloads)

Here is a photo of the latest project, my version of a Micro guide eyepiece. It is fitted with a grid line system
covering 50 Arc seconds in the eyepiece. Each grid line is separated by 1.3 Arc seconds.
For the grid lines I used 0.06mm mono. The grid pattern is illuminated by light (observatory light) being refracted
via the plexiglass cover. For spacing the grid lines, I used the bed from my MK1 device. For scale I've included my 32mm Plossl (1.25").

I am extremely pleased by the performance of this little and simple device.


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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Do you measure double stars?? new [Re: Rutilus]
      #5399978 - 09/02/12 05:51 PM Attachment (69 downloads)

Grid lines, the one on the left covers 100 arc seconds, while the one on the right covers 50 arc seconds and is the one fitted to the device.

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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: Do you measure double stars?? new [Re: Rutilus]
      #5399982 - 09/02/12 05:52 PM Attachment (65 downloads)

Bed device and micrometer for spacing grid lines.

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Rich (RLTYS)Moderator
Post Laureate
*****

Reged: 12/18/04

Loc: New York (Long Island)
Re: Do you measure double stars?? new [Re: Rutilus]
      #5400681 - 09/03/12 07:48 AM

Wow! Your equipment is so cool.

Rich (RLTYS)


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rookie
Good Night Nurse
*****

Reged: 01/14/06

Loc: St. Petersburg, FL
Re: Do you measure double stars?? new [Re: Rich (RLTYS)]
      #5401233 - 09/03/12 03:03 PM

I believe you could sell your work. Very nice.

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StarDusty
sage


Reged: 10/02/07

Loc: Parsippany, NJ
Re: Do you measure double stars?? new [Re: rookie]
      #5421465 - 09/14/12 07:36 PM Attachment (56 downloads)

I have been measuring doubles using the video methods for a year or so.

I have used BiStar, Reduc and Limovie for this purpose.

I recently completed a home made 4" f/28.5 Schiefspiegler which is proving to be good for both planetary and double star observing.

Here is an example how I document my observation. This example is IZAR, STF1877Al. This is an actual image I captured during the video measurement process.

Edited by StarDusty (09/14/12 07:47 PM)


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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Do you measure double stars?? new [Re: StarDusty]
      #5426513 - 09/17/12 11:58 PM

Hey StarDusty: I hope you will submit your measures to JDSO. Or perhaps you do so already?

Ed


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StarDusty
sage


Reged: 10/02/07

Loc: Parsippany, NJ
Re: Do you measure double stars?? new [Re: Ed Wiley]
      #5428289 - 09/18/12 09:21 PM

I have not submitted yet. Another member of my astronomy club has suggest I do so too.

I hope to work my way back through all my prior captures, on the order of 400 avi files, about 100 doubles. My winter project...

Allen


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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Do you measure double stars?? new [Re: StarDusty]
      #5428999 - 09/19/12 10:43 AM

Excellent, Allen, hope to see you in print.

Ed


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WRAK
scholastic sledgehammer


Reged: 02/18/12

Re: Do you measure double stars?? new [Re: Ed Wiley]
      #5620746 - 01/13/13 12:59 PM

A quite interesting method of measuring the separation of equal bright doubles up to +6mag with extremely high precision of about 0.05" is a simple interferometer device consisting of an aperture mask with two 10mm holes with variable distance (or alternative several masks with different fixed distance between the holes). The method is described in detail in this article "http://homepage.univie.ac.at/franz.kerschbaum/SuW_Eigen_Inter.pdf" (sorry, only in german language available).
Wilfried


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StarDusty
sage


Reged: 10/02/07

Loc: Parsippany, NJ
Re: Do you measure double stars?? new [Re: WRAK]
      #5621352 - 01/13/13 06:04 PM

Sounds interesting, but my German is not too good.

Ed, I submitted a week ago by email, 214 measurements of 90 plus doubles.

Al


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Ed Wiley
scholastic sledgehammer


Reged: 05/18/05

Loc: Kansas, USA
Re: Do you measure double stars?? new [Re: StarDusty]
      #5623536 - 01/14/13 10:15 PM

Excellent Al!

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