The center plate

Scripts and programs to automate Astroart
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Patrick
Posts: 36
Joined: 01 Oct 2019, 01:10

The center plate

Post by Patrick » 20 Jul 2023, 00:59

Hello,
In script functions, for example Image.EstimateRaDec what is defined as "the center plate"?
Regards,
Patrick.

AlessandroMaitan
Posts: 19
Joined: 09 May 2019, 08:02

Re: The center plate

Post by AlessandroMaitan » 21 Jul 2023, 08:20

Hi Patrick,
"center plate" is a geometrical definition of the coordinates (x/2,y/2) where x and y are the numbers of the pixels of the sensor.
Regards.

Alessandro Maitan

Patrick
Posts: 36
Joined: 01 Oct 2019, 01:10

Re: The center plate

Post by Patrick » 22 Jul 2023, 07:29

Alessandro,
Thank you. Very clear.
Regards,
Patrick.

Patrick
Posts: 36
Joined: 01 Oct 2019, 01:10

Re: The center plate

Post by Patrick » 31 Jul 2023, 00:16

Hello again,
Further to the response above,Is the central plate the center of the sensor, or perhaps could it be also the center of an image or a rectangle?

What is the function of the Center plate selectors in the Astrometry window?
Regards,
Patrick.

AlessandroMaitan
Posts: 19
Joined: 09 May 2019, 08:02

Re: The center plate

Post by AlessandroMaitan » 31 Jul 2023, 08:49

Hello Patrick,
the answer to the first question is yes, it could be also the center of an image. According to my understanding the always a geometrical definition (i.e. an image, either cropped or not, is centered at coordinates x and y).
The center plate selection is not in the Astrometry window but you can always select it with View -> Grid.
I hope to have understood your question.

Regards

Alessandro

Patrick
Posts: 36
Joined: 01 Oct 2019, 01:10

Re: The center plate

Post by Patrick » 01 Aug 2023, 01:10

Alessandro
Thanks for the answer to the first question.
The Center plate details I referred to is seen if i follow the Tutorial on Plate Solving (AA8 SP4 User's Guide p. 16) then select Astrometry from the Tools menu.

Patrick.

AlessandroMaitan
Posts: 19
Joined: 09 May 2019, 08:02

Re: The center plate

Post by AlessandroMaitan » 01 Aug 2023, 08:40

Hello Patrick,
in the Astrometry panel of the Tool Menu the item "Center Plate", as far as I have understood, indicates the precision in pixel (0.5 is the suggested precision) of the position of the center plate once the Astrometry calculation have been done. It is indicated by a red inclined cross in the image you are analysing.

Regards

Alessandro

Patrick
Posts: 36
Joined: 01 Oct 2019, 01:10

Re: The center plate

Post by Patrick » 02 Aug 2023, 23:23

Alessandro,
Thanks for the response.
This all seems outside my level and is best left alone by me.
Regards,
Patrick

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