small satellites (SOLVED)

[schenk]

greetings,

im attempting to work with cassini small satellite data (Janus, etc.).
after calibration it fails on levinit:

(note that I have created a *.def. file for each moon, with updated information. it recognizes these files and loads them into labels. but it seems to need something else or skips the information in them. ive looked at the bsp file and even tried to make my own with the moon added, but that was no good, or was not done proper). it will run Levinit if i substitute the name of another moon into the labels, keeping the janus.def.1 file. but the information does not show an object in the field of view.


Toolkit version: N0060

SPICE(SPKINSUFFDATA) --

Insufficient ephemeris data has been loaded to compute the state of 610 (JANUS)
relative to 0 (SOLAR SYSTEM BARYCENTER) at the ephemeris epoch 2006 SEP 25
23:36:45.166.

A traceback follows. The name of the highest level module is first.
spkezp_c --> SPKEZP --> SPKSSB --> SPKGEO

Oh, by the way: The SPICELIB error handling actions are USER-TAILORABLE. You
can choose whether the Toolkit aborts or continues when errors occur, which
error messages to output, and where to send the output. Please read the ERROR
"Required Reading" file, or see the routines ERRACT, ERRDEV, and ERRPRT.


any ideas?
paul

[jshinaman]

Hi Paul,

Would you please attach your .def file here and we'll take a look at it.

Thanks,

Jac

[schenk]

#*****************************************************************************
#
#_TITLE telesto.def.1
#
#_DESC This file contains parameters which define Mimas for ISIS lev
# routines. If this file is modified you should keep the old version
# and increment the version number of the file by one. For example,
# change from mimas.def.1 to mimas.def.2. The values below were
# acquired from the files in the CASSINI/kernels/pck directory on
# naif.jpl.nasa.gov.
#
#_HISTORY
#
# MAR 16 2005 Jac Shinaman, Original version (mimas.def.1) created with
# data from $ISISCSSDATA/cpck01Mar2005.tpc
#_END
#*****************************************************************************
TARGET=PANDORA

******************************************************************************
* IAU Radius
******************************************************************************
A_AXIS_RADIUS=55.
B_AXIS_RADIUS=44.
C_AXIS_RADIUS=31.

#*****************************************************************************
# POSITIVE_LONGITUDE_DIRECTION=WEST
#*****************************************************************************

POSITIVE_LONGITUDE_DIRECTION=WEST

RIGHT_ASCENSION_0=40.58
RIGHT_ASCENSION_1=-0.036

DECLINATION_0=83.53
DECLINATION_1=-0.004

PRIME_MERIDIAN_0=162.92
PRIME_MERIDIAN_1=572.7891

[jshinaman]

Hi Paul,

Thanks for the .def file. I can't verify your values, but the format looks accurate. Now let's see what SPK file is getting loaded by the software. Would you please provide the labels portion of one of the cubes you are working on. We should probably have your print.prt file also.

Thanks,

Jac

[schenk]

>>>
please note I put Mimas into the labels because it was the only way to get levinit to find any values and run to completion
paul
<<<


INSTPARS = "/usr/local/isis21/cssdata/iss_parameters.def.1"

END_GROUP = ISIS_INSTRUMENT



GROUP = ISIS_TARGET

TARGET_NAME = MIMAS

LATITUDE_SYSTEM = "OGRAPHIC"

LONGITUDE_SYSTEM = 360

TARGDEF = "/Users/schenk/icy/pandora.def.1"

END_GROUP = ISIS_TARGET



GROUP = BAND_BIN

BAND_BIN_ORIGINAL_BAND = 1

BAND_BIN_UNIT = MICROMETERS

BAND_BIN_FILTER_NAME = "CL1_CL2"

BAND_BIN_CENTER = .610677

BAND_BIN_WIDTH = .340923

END_GROUP = BAND_BIN



GROUP = ISIS_INGESTION

PDS2ISIS_VERSION = "2006-04-06"

PDS2ISIS_TRANSLATION_TABLE =

"/usr/local/isis21/cssdata/iss2isis_translation.def.3"

KEEP_BYTES = "NO"

END_GROUP = ISIS_INGESTION













GROUP = ISIS_GEOMETRY

BASE_KERNELS = ("/usr/local/isis21/cssdata/naif0008.tls",

"/usr/local/isis21/cssdata/cas_v37_vims.tf",

"/usr/local/isis21/cssdata/cas00111.tsc",

"/usr/local/isis21/cssdata/cpck11Oct2005.tpc")

SPACECRAFT_KERNELS =

"/usr/local/isis21/cssdata/051011R_SCPSE_05245_05257.bsp"

CAMERA_KERNELS = "/usr/local/isis21/cssdata/05247_05252ra.bc"

CAMERA_KERNEL_TYPES = 3

KERNLST = "/Users/schenk/icy/css_kernels.def.40"

NAIF_SOFTWARE_VERSION = "CSPICE_N0060"

LEV_SOFTWARE_VERSION = "CSS_ISS_1.0"

END_GROUP = ISIS_GEOMETRY

END_OBJECT = QUBE

END



GROUP = PDS2ISIS

ISISVERSION = "2.3.1-REL_3_1"

ISISBUILDDATE = "2006-07-14T18:57:23"

VERSION_DATE = 2006-04-06

DATE_TIME = 2007-07-17T12:47:29

NODE_NAME = "lpis59"

USER_NAME = "schenk"

SOFTWARE_DESC = "Create ISIS cube file from PDS product file"

GROUP = PARAMETERS

FROM = "N1504611846_1.IMG.cal.lbl"

TO = "N1504611846_1.IMG.cal.lev1.cub"

WORKDIR = ""

TRANSTAB = "/usr/local/isis21/cssdata/iss2isis_translation.def.3"

LIST = ""

KEEPBYTES = "NO"

END_GROUP = PARAMETERS

END_GROUP = PDS2ISIS

[jshinaman]

Hi Paul,

The problem is, the small satellite bodies you are identifying (Janus, Pandora, Telesto, etc.) are not defined in the SPK file for the given time frame. As a matter of fact, I don't see them defined in any of the SPK files produced by the CASSINI team. So, although you have defined the attitude and shape for the bodies, there's no definition of where the spacecraft is in relationship to the bodies. I think the only reason you can get anything out of the software by defining Mimas as the target is that Mimas is defined in the SPK. However, as you've noticed, this fails because your getting position information for Mimas and not Janus.

I'm going to have to email the CASSINI team and ask them for assistance. I will get back to you as soon as I get a response. Please let me know if you come up with anything in the mean time.

Thanks,

Jac

[jshinaman]

Hi again Paul,

Would you please tell me where you're getting your target definitions from? I'm experimenting with the data but I don't know where to get the target attitude and shape data.

Thanks,

Jac

[schenk]

best palce is an IAU document which i am attaching.

i suspected the information was not in the scks. i wonder if its under a different name, like "rocks" or "small_sats" would be consistent with them lumping them together or using the IAU S15-01 style names....
paul

[jshinaman]

Hi Paul,

Thanks for the IAU file.

I think you're on to something with the alternate PCK/SPK files for the "ring bodies". After looking further on the NAIF public ftp site, I found cpck_rock_01Oct2007_merged.tpc and 070424AP_RE_90165_14363.bsp. So I downloaded these files and put them in my working directory. Then I made pandora.def.1 using the data you provided (I'm working with N1504611846_1.IMG data). And finally, I modified css_kernels.def.46 (located in $ISISCSSDATA) by adding the two files at the top of the SPK/PCK section. Then I successfully ran "iss2isis".

I still have a question into the CASSINI team because that particular file pairing is not accurately listed in their PCK to SPK Compatibility Table, so I want to make sure the pairing is correct. You may be aware of this, but with the CASSINI mission, as opposed to other missions, these files have to be paired correctly to achieve accurate results.

I'll let you know if this is correct. If it is we will probably update our data distribution site with the new files.

Jac

[schenk]

jac,

downloaded the files but the latest tpc files i could find were19Apr2007.
paul

[jshinaman]

Hi Paul,

We haven't put the new files out on our distribution site because we are still waiting for confirmation from the CASSINI team that the cpck_rock_01Oct2007_merged.tpc/070424AP_RE_90165_14363.bsp PCK/SPK file pair is accurate (this pairing must be right to produce accurate results). Right now they list a different pairing: cpck_rock_01Oct2007_merged.tpc/070815AP_RE_90165_14363.bsp The problem is, 070815AP_RE_90165_14363.bsp doesn't exist, so I think it's a typo. However, I'd like them to confirm that.

I'll let you know as soon as we hear from them.

Thanks,

Jac

[schenk]

jac,
any word from Cassini on the files? this is the sort of stuff they are responsible for, and they should be responsive. let me know if they are not.
paul

[jshinaman]

Hi Paul,

I'm sorry for not getting back to you sooner, but I still haven't heard from the CASSINI team yet. Regardless, I do think it's a safe bet that the cpck_rock_01Oct2007_merged.tpc/070424AP_RE_90165_14363.bsp PCK/SPK file pair is accurate. If you need to proceed, then I would go ahead and download the files from the NAIF ftp site, and then add the pairing to your latest .def file. Please let me know if you run into problems.

Thanks,

Jac

[isismgr]

Hi Paul,

We still are waiting for an answer from the CASSINI team. Larry has also contacted them so we are hopeful we will hear something soon. Have you tried the solution I gave you in my last post?

Thanks,

Jac

[jshinaman]

Hi Paul,

The CASSINI team has updated their SPICE data to include the missing PCK/SPK pair for Oct 01, 2007 (cpck_rock_01Oct2007_merged.tpc/070815AP_RE_90165_14363) and these files are available on our ISIS 2 distribution site.

I should note that they do list a more updated pair in their "PCK to SPK File Compatibility Table" but they have not yet provided these files on the NAIF site. I will update our data area with these new files as soon as they become available.

Thanks for your patience,

Jac