[Spice_discussion] Summarizing CK and SPK files with Icy

[Lee Elson]

William:

The short answer (probably to be echoed a few times from people here) is 
to use CKBRIEF for CK's instead of BRIEF.

See
ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/ascii/individual_docs/ckbrief.ug

Lee Elson


William Thompson wrote:

> I need to be able to document the contents of CK and SPK files, so 
> that I can create a database listing what time ranges each file 
> contains.  My original plan was to use the "brief" program, and parse 
> the output.  This works okay for SPK files, e.g.
>
>> argo:~/kernels> /usr/local/icy/exe/brief behind_2006_114_02.epm.bsp
>> Brief.  Version: 2.2.0        (SPICE Toolkit N0058)
>>     Summary for: behind_2006_114_02.epm.bsp
>>   Body: STEREO BEHIND (-235)
>>       Start of Interval (ET)              End of Interval (ET)
>>       --------------------------------    
>> --------------------------------
>>       2006 APR 24 11:27:34.470            2007 MAY 01 00:01:04.183
>
>
> However, this doesn't seem to work properly with CK files.  For those 
> files, the "brief" program reports bogus times, evidently because it 
> doesn't have access to the corresponding SCLK and LSK files, i.e.
>
>> argo:~/kernels> /usr/local/icy/exe/brief ahead_2006_070_00.ah.bc
>> Brief.  Version: 2.2.0        (SPICE Toolkit N0058)
>>     Summary for: ahead_2006_070_00.ah.bc
>>   Body: -234000
>>       Start of Interval (ET)              End of Interval (ET)
>>       --------------------------------    
>> --------------------------------
>>       14336 NOV 28 16:05:14.127           14337 JAN 26 01:36:58.127
>
>
> When I use the "spacit" program, I'm able to load the SCLK and LSK 
> files, and get the proper time range, i.e.
>
>> Summary for CK file: ahead_2006_070_00.ah.bc
>> Leapseconds File   : naif0007.tls
>> SCLK File          : sclk/ahead_science_03.sclk
>> Summary Type       : Entire File
>>   
>> -------------------------------------------------------------------------------- 
>>
>
> >    Segment ID     : STEREO Behind spacecraft bus
>
>>    Instrument Code: -234000
>>    Spacecraft     : Body -234, STEREO AHEAD
>>    Reference Frame: Frame 1, J2000
>>    CK Data Type   : Type 3
>>       Description : Continuous Pointing: Linear Interpolation
>>    Available Data : Pointing and Angular Velocity
>>    UTC Start Time : 2006 MAR 11 10:02:49.977
>>    UTC Stop Time  : 2006 MAR 11 15:31:18.977
>>    SCLK Start Time: 1/1520762569:250
>>    SCLK Stop Time : 1/1520782278:250
>> --------------------------------------------------------------------------------  
>
>
>
> However, spacit is an interactive program, and thus can't be used in 
> cron jobs.
>
> How do I extract the start and end times from a CK file in Icy?
>
> Thank you,
>