Instrument Pointing
Instrument pointing and rotational rates.
View the source on GitHub
Properties
* = required
Name | Type | Description |
---|---|---|
ra_pointing | number | RA pointing of the instrument Z axis. ICRS declination [deg], utilizes the J2000 epoch and an equatorial coordinate system. |
dec_pointing | number | Dec pointing of the instrument Z axis. ICRS declination [deg], utilizes the J2000 epoch and an equatorial coordinate system. |
roll | number | Roll [deg] of the instrument about its Z axis |
position_angle | number | Rotation angle [deg] between the spacecraft X-Z plane and the plane defined by the spacecraft X-axis and celestial North |
attitude_quarternion | array | Representing attitude state of a spacecraft, using four element vector [q1, q2, q3, q4], composed of a scalar and 3 element unit vector. |
rotation_rate | array | Rotational rate [rad/s] about the X, Y, and Z axes respectively |
time | string | Time [UTC, ISO 8601] of this data, if different than the trigger time. |
Example
{
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/notices/core/Pointing.schema.json",
"ra_pointing": 120.5,
"dec_pointing": 30.2,
"roll": -12.8,
"position_angle": 23.7,
"attitude_quarternion": [
0.2,
0.3,
0.4,
0.5
],
"rotation": [
-0.01,
0.05,
0.02
],
"time": "2022-05-08T13:30:00Z"
}