✨ 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.
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.
Once you cloned this repository in your local environment, install the dependencies.
cd simetral
npm installGreat! 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
Now inside the index.html of the client.
Install Graphem.
npm i graphemImport 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
Below is a brief explanation using the data collected from the Horizons System:
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
Fraction of the target objects' assumed circular disk illuminated by Sun (phase), as seen by the observer.
Units: PERCENT
The Sun's apparent range ("r", light-time aberrated).
The Sun's apparent range-rate ("rdot") relative to the target center.
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
Apparent range-rate ("delta-dot") of the target center relative to the observer.
Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time.
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
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
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
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
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
Distributed under the MIT License.
See LICENSE for more information.