GUIDE FOR SPECTROSCOPY

[Joan Guarro Fló]

Hello all,

Finally I try the PHD2, the result is excellent, which is why I dare to ask the authors modifications, to make more effective PHD2 for the guided spectrographic work.

I am very aware of the work that this represents, so I apologize previews.

To define the size of the slit and its position on the map of pixels of the CCD guide is a great tool.

But the guiding philosophy for the spectrography is very different, the guide for astrophotography or photometry.

The slit, and further, the pinhole, points are very well defined, very specific and accurate map of the pixels of the CCD guide.

For spectrography need to bring the star to observe, to map the exact coordinates of pixels. We also need, at times guide to make small adjustments in positioning, pixel to pixel, to place the star on the optimal position.

The star should be able to move these coordinates.

One possible solution would mark the exact position with green cross. And the green square, carrying the star was observed in the center of the pinhole.

Attached two PNG, where appreciate my cometary graphically.

Thank you for your attention. Friendly, Joan.

[Andy Galasso]

Hello Joan, thanks for the information.  Have you tried selecting the Spectrograph Slit overlay from the View menu?  You can use the Slit Position option on the View menu to define the position, size, and angle of the slit (or pinhole), then use the Adjust Lock position tool (Tools menu) to move the lock position onto the slit.

Hope that helps,

Andy

[Joan Guarro Fló]

ello Andy,

It is fantastic to define the position and size of the slit or pinhole. But it does not have many practical effects. It would be very good that when activating the position of the slit or pinhole, the PHD2, instantly recognize the geometric center of the slit or pinhole, such as the "Lock Position".

Another option, which could also work very well (and it would not be necessary to use the position of the slit or pinhole), it would be, that it could be dragged with the mouse, the big green cross to a certain position. And that the PHD2 recognized the center of the great green cross as a blocking position. From the point of view of an observer, his execution was easy and agile.

I insist, it would also be very useful to vary the pixel-pixel value of the blocking position, without interrupting the guide.

Possibly I am asking for things that are very difficult from the point of view of a programmer. But then the PHD2 would be one of the best software for the spectroscopic guide. Now, it does suffer a bit.

At the present time, I have tried to follow the instructions for blocking the position, with unequal results, (surely there is something I do not do well),

Most of the time, I did not manage to lock the lock position correctly. PHD2 I prefer to be a lock position, the position of a star.

What do i do wrong? Could you tell me in a more detailed way the steps to follow? Nowadays, I am spending a lot of time in defining the position. And if I interrupt the guide I also lose the lock weight.

Can you help me?

Many thanks for your help. Joan.

El divendres, 16 juny de 2017 0:09:23 UTC+2, Andy Galasso va escriure:

[Andy Galasso]

Hi Joan,

I put some step-by-step instructions on the PHD2 Wiki: Guiding for Spectroscopy.

I hope you will find the process to be simple and efficient. If not, please let us know how we can improve it.

Andy

[Joan Guarro Fló]

Hi Andy,

I have tried your instructions and they have worked perfectly. I'm very happy with the PHD2 guiding.

For many years, I used a software that its authors have not updated, currently the operation of this software was very precarious.

Now with the PHD2, I am saving time of integration and I have a better precission in the final result.

I sent you the result of an observation last night, it is the star VV Cep, it is the sum of 10 integrations of 160 seconds, with a resolution R = 10000.

Many thanks for your help, Joan.

 

[Andy Galasso]

Joan, thanks for the update, glad to hear it is working for you.

Andy