Star Atlas query

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AndrewP
Posts: 17
Joined: 29 Nov 2021, 00:06

Star Atlas query

Post by AndrewP » 08 Jan 2023, 02:30

Hi Fabio

First off, I'd just like to say that AstroArt is an amazing piece of software and just gets better with every SP release. I have a query on the automatic reference stars Star Atlas option. There is a box titled "Astrometry". Could you advise what that is for and when should it be used.

Regards
Andrew Pearce
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Dunmunro
Posts: 230
Joined: 10 Jan 2019, 01:11

Re: Star Atlas query

Post by Dunmunro » 08 Jan 2023, 06:54

AndrewP wrote:
08 Jan 2023, 02:30
Hi Fabio

First off, I'd just like to say that AstroArt is an amazing piece of software and just gets better with every SP release. I have a query on the automatic reference stars Star Atlas option. There is a box titled "Astrometry". Could you advise what that is for and when should it be used.

Regards
Andrew Pearce
See Astroart Guide (help menu)->Contents->Tools->Astrometry

fabdev
Posts: 477
Joined: 03 Dec 2018, 21:43

Re: Star Atlas query

Post by fabdev » 08 Jan 2023, 14:53

Hi, the new option "Astrometry" selects the best stars with a different algorithm: instead of selecting the highest S/N it tries an uniform coverage of the image, which is useful for mapping optical distortions. However this is imporant only when less the 50 stars are used: try for example with 20 stars and you'll see that they are better placed in all zones of the image.
For 500 stars the option "Astrometry" will probably not make a difference.

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