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etc

This is a generalized Exposure Time Calculator for imaging and spectroscopic instruments for the optical-NIR regime (thermal emission is not included). It also contains a growing collection of "optical components" data in etc/data/comp for:

  • atmospheric transmission
  • mirror reflectivities (protected and enhanced Aluminium, gold and silver coatings)
  • CCD, CMOS, NIR detector QE curves (23 so far)
  • various optical glasses (BK7, CaF2, FK5, fused silica etc)
  • sky background/atmospheric emission data
  • filter transmissions for LCO and selected ones from ESO, ING, Gemini, SOAR

Usage

Development Guide - Getting started

Before installing any dependencies or writing code, it's a great idea to create a virtual environment. We primarily use regular virtualenvs to manage virtual environments, although conda may work. Using virtualenv, you can run the following to create and activate a new environment:

>> python -m venv /path/to/new/virtual/environment
>> source /path/to/new/virtual/environment/bin/activate

(On Windows, invoke the venv command as follows:

>> C:\>Python310\python -m venv C:\path\to\myenv
>> C:\> C:\path\to\myenv\Scripts\activate.bat (cmd.exe)
or
>> PS C:\> C:\path\to\myenv\Scripts\Activate.ps1 (PowerShell)

If you have conda installed locally, you can run the following to create and activate a new environment.

>> conda create env -n <env_name> python=3.10
>> conda activate <env_name>

Once you have created a new environment, you can install this project for local development using the following commands:

>> pip install -e .
>> pip install -e .'[dev]'
>> pre-commit install