×
INDI Library v1.8.1 Released (09 Sep 2019)

Monthly maintenance release INDI v1.8.1

ASTAP astrometry integration

3 weeks 4 days ago 3 weeks 4 days ago by G_Gagnon.
G_Gagnon
Senior Boarder
Senior Boarder
Posts: 42
More
ASTAP astrometry integration #45644
What I found running ASTAP, in a simulated environment (pointing to Alnitak), is that it would not solve with an exposure of 8 seconds with the default number of stars used for solution but did solve with an exposure of 1~2 seconds; and wickedly fast (1 second).

I have not done thorough tests but it would seem that the number of stars used to solve and the exposure used may be factors to be tuned together. I did do another simulated test with less/more stars being used when using shorter/longer exposures and there seems to be a relation. So, if ASTAP doesn't solve you may try to reduce the exposure in astrometry or, if using longer exposures, use more stars to solve.

As far as real life solving, the current weather tells me that I will have to wait :-( .

Please Log in or Create an account to join the conversation.

3 weeks 4 days ago
stash
Gold Boarder
Gold Boarder
Posts: 318
Karma: 4
More
ASTAP astrometry integration #45645

AstroNerd wrote: Thanks for the reply..
But you show the settings in the ASTAP software which I don’t have or use, I am using just Kstars / Ekos to platesolve, using the ASTAP solver, ...so have you got guides for that...the best way to test was to use the simulators as all info is prefilled and correct, but still no joy..


I do not understand the reply here -if you are using ASTAP from Ekos you have ASTAP installed and are just using ASTAP in command line mode!

Han can correct me if I am wrong but all settings will still be saved as per stand alone ASTAP??? - but it maybe that some need exposing to EKOS to allow users to change WITHOUT loading ASTAP. But this is a EKOS/ASTAP integration problem not an ASTAP. problem which will come from more testing.
As for "Blind" solving" that would depend on whether the "Ignore Dec/RA in FITS header" is ticked else ASTAP will use those to start searching. For those of us who use DSLR (Canon) there are no stored Dec/RA co-ords as only Fits,as far as I know, stores solved Dec/RA co-ordinates. So if you Fits image has already been solved and the above "ignore" is not checked then ASTAP will just say its solved.

So as Han says set up a link to a full blown image and your settings and lets see if there is a problem or not - there could be :-) or perhaps just us users getting used to something that's new - we all suffer from that :-)

As a point of interest using ASTAP directly without 3rd party software (Ekos,CCDciel) I am solving (non blind) Fits images in under 1 sec consistently - fastest 0.5 sec's being my record - not on a RPI :-) I find that unbelievable if you consider the maths and file lookup involved.

Hopefully your problems will be found and corrected :-)

Not forgetting the other option now available of "live stacking" - though admittedly not usable IMHO on PI's of any description - great if you do EAA!

RPI3 Ubuntu 16.04 / AMD desktop Kstars under Ubuntu 16.04 Mounts :azeq6 ,SWAZGoTo

RPI3 Fedora testing out on AMD desktop Fedpra 28 - running kstars 2.9.4 , Indilib 1.7.4 ?????

Please Log in or Create an account to join the conversation.

3 weeks 4 days ago
han.k
Gold Boarder
Gold Boarder
Posts: 181
Karma: 5
More
ASTAP astrometry integration #45646

G_Gagnon wrote: What I found running ASTAP, in a simulated environment (pointing to Alnitak), is that it would not solve with an exposure of 8 seconds but did solve with an exposure of 4 seconds; and wickedly fast (1~2 seconds). I have not done thorough tests but it would seem that the number of stars used to solve, as mentionned previously, may be a factor as there will be more stars in longer exposures. I will do another simulated test with less stars being used when using longer exposures. So, if ASTAP doesn't solve you may try to reduce the exposure in astrometry.

As far as real life solving, the current weather tells me that I will have to wait :-( .


Bright or very bright stars are normally not a problem. It will work with 2, 5 or 300 seconds exposure. Default there is a star limit of 500 stara. If it sees more stars (typical much more) it will take only the 500 brightest stars (default). Try it live if the weather allow but check prior the conditions above. Especially image height should be at least 1000 pixels (check binning) at focal ratio & sensor size should be set reasonable correct in Ekos . If the search spiral is beyond 2 degrees it will show this popup notififier:


- The first line indicates the search spiral distance (8º) from the start position and the maximum search radius (90º)
- The image height in degrees (1.32º).
- Downsample setting and the input dimensions of the image to solve. (0 is auto)
- The α and δ of the start position.
- Speed normal (▶▶) or small steps (▶)[/li]

Hopefully the weather clears up soon for you.

Han
Attachments:

Please Log in or Create an account to join the conversation.

3 weeks 4 days ago
han.k
Gold Boarder
Gold Boarder
Posts: 181
Karma: 5
More
ASTAP astrometry integration #45647
The command line parameters will have preference. So they will overwrite the setting set in the GUI.

Easiest way to test the solver is to load a FITS image in the viewer. The important data will be extracted from the header like mount position and focal ratio and so on. The Solver specific settings can be set in tab alignment of the stack menu. Loading and solving RAW files like CR2 file is also possible but DCRAW should be installed and you have to set the initial RA, DEC position in the viewer and image height in tab alignment. So for RAW you better test with EKOS.

Settings will be save automatically so if you change some important parameters, reset them later to default from the viewer, File, SETTING, RETURN TO DEFAULT SETTINGS AND EXIT.

Han

Please Log in or Create an account to join the conversation.

3 weeks 4 days ago
G_Gagnon
Senior Boarder
Senior Boarder
Posts: 42
More
ASTAP astrometry integration #45648
Thanks for your reply Han. You can disregard my recent 'edit'.

What is great with ASTAP as an astrometry solver is that not only it is very fast, its catalog, compared with the astrometry.net catalog, is manageable sizewise for systems that do not have much storage capacity (RPI, ODroid,...) and do not have access to the Internet for online solving. (y)

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago
AstroNerd
Moderator
Moderator
Posts: 673
Karma: 1
More
ASTAP astrometry integration #45658
I do not have ASTAP installed, I only have whatever comes with Kstars, I have NO stand alone ASTAP programme Installled, the only thing installed from the ASTAP website is the G17 catologue

Stellarmate OS BETA on Raspberry pi4b
Skywatcher EQ8 pro
Meade series 5000 80mm triplet Apo & Meade 8” SCT (de-forked)
Starlight Xpress SXVR H18, SXVR M25c, Lodestar Guide Camera
Pegasus Ultimate Hub for all USB & Power
Pegasus focus motors on both scopes

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago 3 weeks 3 days ago by stash. Reason: noticed system monitor screen print didn't show ASTAP loaded when using KSTARS - me too slow to hit screen print key.
stash
Gold Boarder
Gold Boarder
Posts: 318
Karma: 4
More
ASTAP astrometry integration #45679

AstroNerd wrote: I do not have ASTAP installed, I only have whatever comes with Kstars, I have NO stand alone ASTAP programme Installled, the only thing installed from the ASTAP website is the G17 catologue


If you are able to click on the Kstars Astrometry option and tick ASTAP you will see where ASTAP is to be found as used by KSTARS. This can be manually loaded from a std terminal windows by type the full pathname. This will loaded the GUI version of ASTAP and you can try and solve an image by loading a FITS image AND by double clicking on the RA or DEC box's (top left) it will ask you for the target cordinates - so for example enter M13 and the Ra/Dec will be shown in the same 2 box's described above. You can then click on the STACK tab and another Window will be shown where you can click on the ALIGNMENT tab. Make sure that the "Star Alignment" box is choosen (this is he ASTAP internal solver). You can then set various options such as Downsample ,Max number of stars. Then just click "Solve Current Image" and watch the bottom status area which will show you what is happening.

For HELP click "HELP" and choose "online help and web page" but a lot of hints appear when you roll your cursor over various options.

See attachments for example using M81 using Kstars and ASTAP command line.

RPI3 Ubuntu 16.04 / AMD desktop Kstars under Ubuntu 16.04 Mounts :azeq6 ,SWAZGoTo

RPI3 Fedora testing out on AMD desktop Fedpra 28 - running kstars 2.9.4 , Indilib 1.7.4 ?????

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago
AstroNerd
Moderator
Moderator
Posts: 673
Karma: 1
More
ASTAP astrometry integration #45686
So whenever I want to use the ASTAP solver, I have to have all those windows open to use it, I was just using the same way as Astrometry.net in ekos....slew to target take image and solve, and move if needed....but guess I was wrong...

Stellarmate OS BETA on Raspberry pi4b
Skywatcher EQ8 pro
Meade series 5000 80mm triplet Apo & Meade 8” SCT (de-forked)
Starlight Xpress SXVR H18, SXVR M25c, Lodestar Guide Camera
Pegasus Ultimate Hub for all USB & Power
Pegasus focus motors on both scopes

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago
ChrisRowland
Gold Boarder
Gold Boarder
Posts: 238
Karma: 7
More
ASTAP astrometry integration #45687
Don't think it's compulosory to use it.

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago 3 weeks 3 days ago by han.k.
han.k
Gold Boarder
Gold Boarder
Posts: 181
Karma: 5
More
ASTAP astrometry integration #45690
ASTAP can be used as command line solver only. But for the other functions and analysing you can just start the GUI from menu topic Education. ASTAP is not only a solver but also a fits viewer, stack program, CCD inspector, deep sky annotation program and photometry program.

Two examples:

Hyperleda annotation near M5:


Photometry, automatic measured star magnitudes near M31 in comparison with AASVO chart:
Attachments:

Please Log in or Create an account to join the conversation.

3 weeks 3 days ago
Carneb
Fresh Boarder
Fresh Boarder
Posts: 16
More
ASTAP astrometry integration #45711
I'm using Kstars 3.3.7 on RPi4 running Stellarmate and tried to use the ASTAP solver but it's not working. I click on the solve button and literally nothing happens. I went to the directory listed in the options to try to start ASTAP and it seems there is nothing there? Do I need to install it separately? I would have thought that if it's part of the Kstars package then it would already be installed with the Kstars install? Having said that I am a Linux newbie so may be missing something obvious.

Please Log in or Create an account to join the conversation.

3 weeks 2 days ago
G_Gagnon
Senior Boarder
Senior Boarder
Posts: 42
More
ASTAP astrometry integration #45712
ASTAP is in fact a separate install. You can get itas a DEB package for the RPI at www.hnsky.org/astap.htm . You will also need to install the star database (G17 or G16, same website) in order to use it as a astrometry solver.

Please Log in or Create an account to join the conversation.

Time to create page: 1.169 seconds