Explain the astap_cli output.

[Yabu Gaillé]

First, thank for this awesome astap_cli, I love it very much.

Partial astap_cli output below, some are not easy to understand...

1. Solution["] x:=4.888853x+ 5.816820y+ -32403.678729, y:=-5.814821x+ 4.884071y+ 9394.003075
2. Solution found: 20: 37 23.1 +46d 14 14
3. Solved in 1.8 sec Δ was 64.0d. Used stars down to magnitude: 9.8
4. Warning scale was inaccurate! Set FOV=10.42d, scale=7.6"

In item 1, the equation, how can I get idea on this?
In item 3, what does the "∆" means.

BTW, I can not find the field rotation in this output until open the file *.wcs, if the filed rotation can be add into this output, will be very convenient.

[han.k]

Hi,

Item 1 is for me as developer. Maybe I should remove it. Just ignore it.
Item3, Greek letter ∆ stands for delta, so for offset or difference. The solution was found 64 degrees from the start point.

The field rotation definition is a little tricky with respect to flipped images. See
http://www.hnsky.org/astap.htm#viewer_angle

Easiest is to use the value behind keyword CROTA2 in the .ini or .wcs file.
Rotation is not in the output. One of the reasons for that is the definition problem for flipped images. Ideally your should the CD keywords but CROTA2 keyword will do fine in most cases.

Han

[han.k]

p.s why do want the rotation in the text output. I could add it but does it help?

[Yabu Gaillé]

I know that document :), to display in cli output is just for not to open the file to get the information :)
Thanks for your effort.