NIRCam Wheel Exercise Template Parameters
JWST's NIRCam Wheel Exercise Engineering template, available in the Astronomer’s Proposal Tool (APT), is used for calibration observations for the NIRCam instrument.
Introduction
Purple text indicates the parameter is Limited Access.
Boldface italics type indicates the name of an APT parameter or a value for a parameter.
Red text indicates restrictions on a parameter.
Black text indicates an important note.
Brown text indicates notes for the developers.
Green text indicates the name of the parameter used by Commanding.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
These parameters are required to rotate the specified wheel 360o. Note that this type of observation cannot be obtained as a parallel to normal science observations, but can be in parallel with slews.
The NIRCam Wheel Exercise template consists of the following parameters:
| Field | Details | Values | Notes |
|---|---|---|---|
| General Information | |||
| Observation Number | assign observation number | number | |
| Observation Label | provide observation label | text | optional |
| Observations Comments | provide observation comments | text | optional |
| Special Requirements | specify special requirements | choose from list | if needed |
| Template Specific Information | |||
specify Mechanism type | choose from list | ||
specify number of integrations | number | ||
specify Wheel | choose from list | ||
General Information
The following parameters are generic to all templates, and are not discussed in this article: Observation Number, Observation Label , Observations Comments, and Special Requirements.
Mechanism Type
MECHANISM TYPE [MECH TYPE] = FILTER, PUPIL
This parameter specifies the mechanism type to be exercised.
Number of Rotations
NUMBER OF ROTATIONS [NROTATIONS] specifies the number of times to rotate the selected wheel(s); the values are between 1 and 6, inclusive.
Wheel
WHEEL [WHEELSLIST] = ALL, LONGA, LONGB, SHORTA, SHORTB
This parameter specifies the wheel(s) to be exercised. You may specify one wheel, more than one wheel (up to all four) or ALL. Specifying a list of two to four wheels will exercise those wheels serially and in the order specified. Specifying ALL exercises all four wheels in parallel.