View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0002301 | SkyChart | 1-Software | public | 20-03-16 22:10 | 20-03-22 10:35 |
Reporter | Hugo52 | Assigned To | Patrick Chevalley | ||
Priority | normal | Severity | minor | Reproducibility | have not tried |
Status | feedback | Resolution | open | ||
Platform | PC | OS | Windows | OS Version | 10 64bit |
Target Version | 4.4 | ||||
Summary | 0002301: Comet tracking, value is wrong | ||||
Description | The comet tracking corrections for PHD2 for comet c/2019 Y4 is wrong RA 99,, I changed it to -199 | ||||
Tags | No tags attached. | ||||
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A possible explanation to the problem can be that PHD2 do not want the RA motion multiplied by the cosine of declination as CdC actually do. This can make a big difference because of the high declination of this comet. But 99/cos(66°) = 243 , not 199. Are you sure of the new value you set? Also what version of CdC and PHD2 do you use? |
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I look at PHD2 source code and see it also multiply the RA rate by the cosine of declination. So this correction was done two time and is the reason for this error. This is fixed by: https://github.com/pchev/skychart/commit/9497f53889744d5b304d9a30b33891936ca078c8 You can download a test version from this location until the fix is in the beta version: https://vega.ap-i.net/tmp/skychart/ For tonight it show a RA rate of -253. Please tell me if this work better now. |
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Last night I have clear sky for testing. The attached image is 10 x 5 minutes stacked without alignment. The result is very good so I think now the computation is right. There is still a difficulty with the sign of the declination movement. I need more testing to clarify this point. I am very interested if you can confirm this behavior with your mount. |
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I do more testing last night. My conclusion is PHD2 current version no more need the declination inversion that was previously necessary. The fix I previously introduce for that must be removed, whatever the side of the meridian the calibration is done. I make a new test version: https://vega.ap-i.net/tmp/skychart/ With this one it give me perfect comet tracking. |
Date Modified | Username | Field | Change |
---|---|---|---|
20-03-16 22:10 | Hugo52 | New Issue | |
20-03-17 15:47 | Patrick Chevalley | Project | CCdciel => SkyChart |
20-03-17 15:49 | Patrick Chevalley | Assigned To | => Patrick Chevalley |
20-03-17 15:49 | Patrick Chevalley | Status | new => feedback |
20-03-17 15:49 | Patrick Chevalley | Category | General => 1-Software |
20-03-17 15:49 | Patrick Chevalley | Product Version | 0.9 => |
20-03-17 15:49 | Patrick Chevalley | Target Version | => 4.4 |
20-03-17 15:49 | Patrick Chevalley | Note Added: 0006393 | |
20-03-17 20:32 | Patrick Chevalley | Note Added: 0006394 | |
20-03-19 10:16 | Patrick Chevalley | Note Added: 0006397 | |
20-03-19 10:16 | Patrick Chevalley | File Added: 20200318-c2019y4.jpg | |
20-03-19 13:03 | Patrick Chevalley | Note Edited: 0006397 | |
20-03-20 17:05 | Patrick Chevalley | Note Added: 0006398 | |
20-03-22 10:35 | Patrick Chevalley | Note Edited: 0006397 |