Simetral

✨ Artemis I mission GraphQL Sever with NASA Horizons data 🛰 - Basic example of Graphem

⚠️ The data will be updated because Artemis 1 mission will reschedule for later.

📦 Purpose

This project is a GraphQL server that allows you to query real-time and historical data from certain data obtained from NASA Horizons for the Artemis I mission.

The server takes the information from a CSV from September 27 to November 5 with a step of 1 minute (one row per minute) from a geocentric observer to the Orion spacecraft. Ready to be sent to NASA Open MCT connected with the Graphem plugin.

The information was collected with NASA Horizons.

🛰 How to use?

Download Simetral GraphQL server

Once you cloned this repository in your local environment, install the dependencies.

cd simetral
npm install

Create a client.

Great! Now you have a GraphQL server, we need a client. You can use your own client.

But I suggest you to download a very simple example like the openmct-tutorial client itself.

git clone https://github.com/nasa/openmct-tutorial.git
cd openmct-tutorial
npm install

Connect with Graphem

Now inside the index.html of the client.

Install Graphem.

npm i graphem

Import Graphem using the following <script> tag inside the <head>.

<script src="node_modules/graphql-ws/umd/graphql-ws.js"></script>

Copy the content from schema_dictionary.json to dictionary.json file in the client directory.

{
  "name": "Artemis I",
  "key": "sc",
  "measurements": [
    {
      "name": "Angular rate of change",
      "key": "angular_rate_of_change",
      "values": [
        {
  ...

Install de plugin using install() method.

openmct.install(Graphem({
  namespace: "rocket.taxonomy", // Custom namespace
  key: "orion", // Custom Key
  dictionaryPath: "/dictionary.json", // Path of dictionary
  telemetryName: "rocket.telemetry", // Name of telemetry
  subscriptionName: "formatted", // Name of the <GraphQL> subscription for historical telemetry
  urn: "localhost:4000/graphql" // Source URN (Uniform Resource Name)
}));

🚀 And start both projects:

cd openmct-tutorial
npm start

cd ..

cd simetral
npm run dev

🚀 Horizons Data

Below is a brief explanation using the data collected from the Horizons System:

dRA*cosD

The angular rate of change in aparent RA and DEC of the target. This is with respect to the non-inertial IAU76/80 Earth true equator and equinox of-date reference frame. d(RA)/dt is multiplied by the cosine of declination to provide a linear rate in the plane-of-sky.

Units: ARCSECONDS PER HOUR

Illumination %

Fraction of the target objects' assumed circular disk illuminated by Sun (phase), as seen by the observer.

Units: PERCENT

Sun range

The Sun's apparent range ("r", light-time aberrated).

Sun range rate

The Sun's apparent range-rate ("rdot") relative to the target center.

Delta apparent range

Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer.

Units: AU and KM/S

Delta apparent range - dot

Apparent range-rate ("delta-dot") of the target center relative to the observer.

S-O-T,/r

Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time.

PsAng

The position angles of the extended Sun-to-target radius vector ("PsAng") and the negative of the targets' heliocentric velocity vector ("PsAMV"), as seen in the observers' plane-of-sky, measured counter-clockwise (east) from reference-frame north-pole. Primarily intended for ACTIVE COMETS, "PsAng" is an indicator of the comets' gas-tail orientation in the sky (being in the anti-sunward direction) while "PsAMV" is an indicator of dust-tail orientation. Units: DEGREES

PsAMV

GlxLon

Observer-centered Galactic System II (post WW II) longitude and latitude of the target centers' apparent position, with light-time, gravitational deflection of light, and stellar aberrations. Units: DEGREES

GlxLat

Sky_motion, Sky_mot_PA, RelVel-ANG

Total apparent angular rate of the target in the plane-of-sky. "Sky_mot_PA" is the position angle of the target's direction of motion in the plane-of-sky, measured counter-clockwise from the apparent of-date north pole direction. "RelVel-ANG" is the flight path angle of the target's relative motion with respect to the observer's line-of-sight, in the range [-90,+90], where positive values indicate motion away from the observer, negative values are toward the observer:

-90 = target is moving directly toward the observer 0 = target is moving at right angles to the observer's line-of-sight +90 = target is moving directly away from the observer

UNITS: ARCSECONDS/MINUTE, DEGREES, DEGREES

📃 License

Distributed under the MIT License. See LICENSE for more information.

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