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INDI Library v2.0.7 is Released (01 Apr 2024)

Bi-monthly release with minor bug fixes and improvements

Questions about the Meridian Flip

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  • Thank you received: 15
Hello All,
I am planning to image a single target the whole night,which involves a meridian flip at about midnight.I'm now using the NEQ6 mount with EQMOD in Kstars.Simply,I want the mount to keep tracking until I perform a Re-Slew after the target passes the meridian.In the Windows Version of EQMOD(with ASCOM),I'll have to turn off the Mount Limits to prevent the mount from stopping automatically before the meridian flip.What should I do in the settings?
Plus,is Kstars using J2000 coordiantes?
Thanks in advance.
Jerome
9 years 2 months ago #2946

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What you see is JNow, for meridian flip, look here
9 years 2 months ago #2947

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Hello knro,
I have encountered a new problem with Ekos offline solver.In order to perform an accurate framing,I was trying to solve an image I found on the Internet.However,I often received 'Solver failed.Please try agian.'After deleting the former axy file,I turned on Verbose and tried to figure out what was going on.Then I got tje following log.It seems that the Solver has obtained the coordinate of my image,but has some problems in the last step concerning an wsc file.Could you please help me find out what was wrong with the solver?Thanks.
Jerome
Last edit: 9 years 2 months ago by Joshua.
9 years 2 months ago #2948
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Please post the text, the screenshots aren't helping.
9 years 2 months ago #2949

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Here is the text:

2015-02-01T08:14:46 Solver failed. Try again.
2015-02-01T08:14:46 solve-field-origin --downsample 2 --no-plots -L 120 -H 240 -u aw -3 149.204 -4 68.9908 -5 30 -W /tmp/solution.wcs /home/astro/Desktop/cf2a1ca4626c4c5b0a9f7042c902fdbd.1824x0_q100_watermark.jpg -S /tmp/solved
ra_h=9, ra_m=50, ra_s=0
dec_n=1, dec_deg=69, ra_m=32, ra_s=18
ra_now=147.515086, dec_now=69.531125
width=3.083500, height=2.000667, rotation=103.660004, FOV=6.167000
2015-02-01T08:14:46
2015-02-01T08:14:46 Field center: (RA,Dec) = (147.7, 69.54) deg.
Field center: (RA H:M:S, Dec D:M:S) = (09:50:40.961, +69:32:18.200).
Field size: 3.08355 x 2.00074 degrees
Field rotation angle: up is -103.663 degrees E of N
Creating new FITS file "/home/astro/Desktop/cf2a1ca4626c4c5b0a9f7042c902fdbd.1824x0_q100_watermark.new"...
2015-02-01T08:14:46 Field: /home/astro/Desktop/cf2a1ca4626c4c5b0a9f7042c902fdbd.1824x0_q100_watermark.jpg
2015-02-01T08:14:46 Field 1 solved: writing to file /tmp/solved to indicate this.
2015-02-01T08:14:45 Field 1: solved with index index-4211.fits.
2015-02-01T08:14:45 log-odds ratio 193.484 (1.0696e+84), 26 match, 0 conflict, 90 distractors, 29 index.
RA,Dec = (147.673,69.5378), pixel scale 6.08885 arcsec/pix.
Hit/miss: Hit/miss: -+-++--++---++-++-+----+++---+-++
+
+--+-+---+---+-+-+--+
2015-02-01T08:14:45 Only searching for solutions within 30 degrees of RA,Dec (149.204,68.9908)
2015-02-01T08:14:45 Reading file "/home/astro/Desktop/cf2a1ca4626c4c5b0a9f7042c902fdbd.1824x0_q100_watermark.axy"...
2015-02-01T08:14:45 Solving...
2015-02-01T08:14:43 simplexy: found 911 sources.
2015-02-01T08:14:40 Downsampling by 2...
2015-02-01T08:14:40 Extracting sources...
2015-02-01T08:14:39 Reading input file 1 of 1: "/home/astro/Desktop/cf2a1ca4626c4c5b0a9f7042c902fdbd.1824x0_q100_watermark.jpg"...
2015-02-01T08:14:39 Starting solver...
9 years 2 months ago #2954

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Strange, did you change any parameter? Are you using kstars-bleeding? latest astrometry.net? I just did a test and it worked fine with jpg images.
The following user(s) said Thank You: Joshua
9 years 2 months ago #2955

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I just filled in the Options blank by my own with the following command:--downsample 2 --no-plots -L 120 -H 240 -u aw -3 149.204 -4 68.9908 -5 30 ,since I was using Telescope Simulator and CCD Simulator,which didn't give me the FOV I want.
It seems that I have deleted something such as --no verify and --not fits,but I couldn't get them back.Was that causing the problem?
Could you please copy your command in the Options blank and paste it here?
Thanks,
Jerome
9 years 2 months ago #2956

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I'm using this:
--no-verify --no-plots --no-fits2fits --resort --downsample 2 -O 

The rest should be automatically filed. You can plan with the CCD simulator image and pixel sizes and telescope focal length to get the FOV you want. The FOV has to be close to the one in the image.
9 years 2 months ago #2957

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Still not working.I have even tried almost every combination of commands.The image can be solved using AstroTortilla and astrometry.net online solver,so the picture file is okay.Besides,from the text I posted,the offline solver of Kstars had already obtained the correct FOV and coordinates,but suffered a problem on extracting the info from a WSC file.Yet, I couldn't think of any reason causing the problem.Any advice on how to figure out what's going on?
Thanks.
Jerome
Edit:http://www.indilib.org/forum/general/539-offline-solver-segfaults.html
I'v found a similar problem here.Have you checked the problem in that thread?
Last edit: 9 years 2 months ago by Joshua.
9 years 2 months ago #2958

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I tried again in the terminal,and here is the result.
9 years 2 months ago #2961
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Screenhots for text output is a bad idea, only post text in this case please.

Please attach the file you are trying to solve and what is the FOV.
9 years 2 months ago #2962

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I am sorry.
The text from the terminal:
astro@tinyastro:/$ solve-field --no-verify --no-plots --no-fits2fits --resort --downsample 2 --overwrite -O -L 120 -H 240 -u aw -3 149.204 -4 68.9908 -5 30 /home/astro/XXX.jpg
solve-field-origin --no-verify --no-plots --no-fits2fits --resort --downsample 2 --overwrite -O -L 120 -H 240 -u aw -3 149.204 -4 68.9908 -5 30 /home/astro/XXX.jpg -S /tmp/solved
Reading input file 1 of 1: "/home/astro/XXX.jpg"...
jpegtopnm: WRITING PPM FILE
Read file stdin: 1824 x 1183 pixels x 1 color(s); maxval 255
Using 8-bit output
Extracting sources...
Downsampling by 2...
simplexy: found 911 sources.
Solving...
Reading file "/home/astro/XXX.axy"...
Only searching for solutions within 30 degrees of RA,Dec (149.204,68.9908)
log-odds ratio 192.713 (4.94672e+83), 26 match, 0 conflict, 90 distractors, 29 index.
RA,Dec = (147.673,69.5378), pixel scale 6.08885 arcsec/pix.
Hit/miss: Hit/miss: ---+++-++---++-++-+----++--+-+-++
+---+
+-+---+---+-+
+--+
Field 1: solved with index index-4211.fits.
Field 1 solved: writing to file /tmp/solved to indicate this.
Field: /home/astro/XXX.jpg
Field center: (RA,Dec) = (147.7, 69.54) deg.
Field center: (RA H:M:S, Dec D:M:S) = (09:50:40.961, +69:32:18.200).
Field size: 3.08355 x 2.00074 degrees
Field rotation angle: up is -103.663 degrees E of N
Creating new FITS file "/home/astro/XXX.new"...

ra_h=9, ra_m=50, ra_s=0
dec_n=1, dec_deg=69, ra_m=32, ra_s=18
ra_now=147.511144, dec_now=69.529192
width=3.083500, height=2.000667, rotation=103.660004, FOV=6.167000
Please upload a default skyset file.
The picture file has an FOV of 3deg*2deg.
9 years 2 months ago #2965
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