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IDProjectCategoryView StatusLast Update
0002356SkyChart1-Softwarepublic20-10-31 15:53
ReporterRichard Lighthill Assigned ToPatrick Chevalley  
PrioritynormalSeverityminorReproducibilityhave not tried
Status resolvedResolutionunable to reproduce 
PlatformPCOSWindowsOS Version10 64bit
Summary0002356: Comet NEOWISE C/2020 f3 NOT at location indicated
DescriptionAfter downloading the latest comet info from within CCdciel the actual comet position is off by a few degrees. Makes it hard to find when using 2000mm telescope. All other stars & objects are dead on.
TagsNo tags attached.


Patrick Chevalley

20-07-25 09:30

administrator   ~0006692

For me the position of the comet is exactly where it should be.
I just compare the position given by CdC and JPL Horizons for today 0h UT and the difference is a few arcsecond because of the heavy non gravitational force that affect this comet and CdC do not take them into account.

Please check the following:
- update the elements again to be sure there is not a glitch in the version you get.
- in menu Setup / Solar system, be sure Position is Topocentric, also be sure your observatory coordinates are set correctly.
- Be sure the computer time and time zone and the CdC time zone are set correctly. Check the UT value in every detail window is the right value.

If this not solve the issue please send me a zip with your file skychart.ini located in %LOCALAPPDATA%\skychart and also the last element file COMET-xxx.DAT located in the MPC subfolder.

Issue History

Date Modified Username Field Change
20-07-24 16:51 Richard Lighthill New Issue
20-07-25 09:07 Patrick Chevalley Project CCdciel => SkyChart
20-07-25 09:30 Patrick Chevalley Assigned To => Patrick Chevalley
20-07-25 09:30 Patrick Chevalley Status new => feedback
20-07-25 09:30 Patrick Chevalley Category General => 1-Software
20-07-25 09:30 Patrick Chevalley Product Version 0.9 =>
20-07-25 09:30 Patrick Chevalley Note Added: 0006692
20-10-31 15:53 Patrick Chevalley Status feedback => resolved
20-10-31 15:53 Patrick Chevalley Resolution open => unable to reproduce