[Spice_discussion] Summarizing CK and SPK files with Icy

[William Thompson]

Blush!!!


Lee Elson wrote:
> 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,
>>
> 
> 

-- 
William Thompson
NASA Goddard Space Flight Center
Code 612.1
Greenbelt, MD  20771
USA

301-286-2040
William.T.Thompson.1 at gsfc.nasa.gov