{%extends "base.html" %} {% block content %}

Groups & Integrations Calculator


This tool calculates the groups and integrations for an optimal transit observation. We require some information about your background star, transit, and planned use of JWST (instrument, subarray, and filter), in order to interpolate your planned transit observation to our nearest information from pandeia (which powers the JWST ETC.)

Please note the following caveats about this tool:
1. At present, this tool is likely to overestimate saturation on direct comparison to the ETC. (This means we may predict less groups -- and put the user in less danger of oversaturating your observation)
2. Users should be aware of data rates. There are maximum number of groups and integrations that each instrument (and APT) allows based on how much data JWST can store. Therefore, results of this tool should always be checked against the documentation and APT. More information can be found at the "JWST Data Rate and Data Volume Limits" JDox page.
3. Calculations are limited to the APT maximum groups per integration: 100 for NIRCam, 30 for NIRISS, and 65,535 for NIRSpec and MIRI.

{{ form.hidden_tag() }} {% include 'target_resolve.html' %}
{{ form.kmag(value=form.kmag.data, size=10, rows=1, class='form-control') }}
\(\small \text{mag}\)
The K-band vega magnitude of the target
{% for error in form.kmag.errors %}

{{ error }}

{% endfor %}
Phoenix stellar atmosphere model that most closely matches your star
{{ form.obs_duration(value=form.obs_duration.data, size=6, rows=1, class='form-control') }}
The length of the observation
{% for error in form.obs_duration.errors %}

{{ error }}

{% endfor %}
{{ form.n_group(value=form.n_group.data, size=10, rows=1, class='form-control') }}
Enter "0" to optimize the number of groups
{% for error in form.n_group.errors %}

{{ error }}

{% endfor %}
The JWST instrument
The photometric bandpass or grism for your science observation
The filter for target acquisition
The full frame or subarray mode for your science observation
The subarray mode for target acquisition
{% for subfield in form.sat_mode %}
{{ subfield(style='margin-left:0px;') }}{{ subfield.label }}
{% endfor %} How to measure the saturation.

{{ form.sat_max(value=form.sat_max.data, size=10, rows=1, class='form-control') }}
The level of saturation
{% for error in form.sat_max.errors %}

{{ error }}

{% endfor %}
Some background on saturation levels to inform your decision: The following is the saturation cap built into the ETC, and the current estimates of max possible saturation (which is what we use when you opt for well fraction).

MIRI NIRCam NIRSpec NIRISS fullwell
{{ sat_data['miri'] }} {{ sat_data['nircam'] }} {{ sat_data['nirspec'] }} {{ sat_data['niriss'] }} [e-] JWST ETC recommendation
{{ 250000 }} {{ 60000 }} {{ 65500 }} {{ 75000 }} max possible saturation

{{ form.calculate_submit(class="btn btn-success") }}

{% endblock %}