[MOIMS-NAV-EXEC] OMM-KVN from space-track.org

[Robert Wolff - NOAA Federal]

Hi,

I've used space-track quite a bit and have worked with their developers, so
I may have useful additional context.

First, I can't figure out how you got those TLES/OMMs. It looks nearly
identical to the response you would receive from their GP class API
endpoint, but that endpoint doesn't seem to support KVN anymore. Maybe
they've deprecated the KVN format since January when those were produced.
Their API documentation does say they've been working on deprecating some
of their OMM formats. If it would be helpful, I could ask if they did that.

Second, I think space-track knows that the equal signs are not required,
but pretty much any space-track KVN product I've seen has equal signs in
the comments. I believe it is so anyone who builds parsers specifically for
space-track instead of for the OMM in general can build parsers that split
each line at the equal sign.

Presumably you retrieved these through the space-track API, right?
Space-track doesn't keep OMMs inside a file structure. They instead use a
relational database. So when requesting multiple of any of their data
products through their API, it will return all of them to you in the same
response.

It's also probably worth mentioning that JSON OMM's do not follow CCSDS
standards in that they remove the USER_DEFINED_ tag off the user defined
fields. They also actually have the true TLE lines contained in the
non-CCSDS compliant versions (HTML, CSV, JSON), but not in the CCSDS
compliant versions (XML, KVN?). I think it would be fair to say the
space-track, and the past version do not believe that CCSDS standards apply
to JSON formats.



On Wed, Jun 11, 2025 at 9:54 AM Lamy Alain via MOIMS-NAV-EXEC <
moims-nav-exec at mailman.ccsds.org> wrote:

> Hi everyone,
>
>
>
> I recently got TLEs from the spacetrack.org website.
>
> Many formats are available, including classical TLEs, JSON, OMM-XML,
> OMM-KVN.
>
> Attached is the KVN version (SWOT S/C).
>
> There are 2 (possibly) interesting points :
>
> -        The “COMMENT” lines are written : COMMENT = xxx
>
> It may means that the description is not precise enough ?
>
> -        As they wanted to minimize the number of files (I suppose), all
> KVNs are grouped in one single file.
>
> Not strictly compliant but convenient.
>
>
>
> Alain
>
>
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[
  {
    "CCSDS_OMM_VERS": "3.0",
    "COMMENT": "GENERATED VIA SPACE-TRACK.ORG API",
    "CREATION_DATE": "2025-06-12T06:46:18",
    "ORIGINATOR": "18 SPCS",
    "OBJECT_NAME": "SWOT",
    "OBJECT_ID": "2022-173A",
    "CENTER_NAME": "EARTH",
    "REF_FRAME": "TEME",
    "TIME_SYSTEM": "UTC",
    "MEAN_ELEMENT_THEORY": "SGP4",
    "EPOCH": "2025-06-12T03:23:11.267232",
    "MEAN_MOTION": "14.00172152",
    "ECCENTRICITY": "0.00009550",
    "INCLINATION": "77.6087",
    "RA_OF_ASC_NODE": "174.8344",
    "ARG_OF_PERICENTER": "175.8336",
    "MEAN_ANOMALY": "184.2824",
    "EPHEMERIS_TYPE": "0",
    "CLASSIFICATION_TYPE": "U",
    "NORAD_CAT_ID": "54754",
    "ELEMENT_SET_NO": "999",
    "REV_AT_EPOCH": "12736",
    "BSTAR": "0.00006989700000",
    "MEAN_MOTION_DOT": "0.00000101",
    "MEAN_MOTION_DDOT": "0.0000000000000",
    "SEMIMAJOR_AXIS": "7271.336",
    "PERIOD": "102.844",
    "APOAPSIS": "893.895",
    "PERIAPSIS": "892.507",
    "OBJECT_TYPE": "PAYLOAD",
    "RCS_SIZE": "LARGE",
    "COUNTRY_CODE": "US",
    "LAUNCH_DATE": "2022-12-16",
    "SITE": "AFWTR",
    "DECAY_DATE": null,
    "FILE": "4754093",
    "GP_ID": "289753301",
    "TLE_LINE0": "0 SWOT",
    "TLE_LINE1": "1 54754U 22173A   25163.14110263  .00000101  00000-0  69897-4 0  9990",
    "TLE_LINE2": "2 54754  77.6087 174.8344 0000955 175.8336 184.2824 14.00172152127366"
  }
]