SNU TAO Tutorials

Tutorials for Techniques in Astronomical Observation, Seoul National University.

You can find tutorials at SNU TAO Tutorials page.

Tutorials

• Tutorial 0: Preprocessing (under construction, written by Hyeonguk Bahk)

• Tutorial 1: PSF photometry (written by Hyeonguk Bahk)

• Tutorial 2: Running SExtractor (written by Jeong Hwan Lee, edited by Jae-Hong Jeong and Hyeonguk Bahk)

• Tutorial 3: Surface Photometry Using GALFIT (written by Hyeonguk Bahk)

• Tutorial 4: Spectroscopic data reduction (under construction, written by Hyeonguk Bahk)

• Tutorial A1: Spectroscopic Data Reduction for SNUO 1m (Fall 2022, written by Hyeonguk Bahk, originally prepared by Jooyeon Geem); This will be updated using the FOCAS data, which will be data needed for the final project.

• Tutorial A2: Optical Spectroscopy Using specutils (written by Jae-Hong Jeong)

1. Preparation

This section is superseded by the Preparation page. This section may be outdated, so please refer to the page for the most recent information.

1.1. Clone this repository

cd <PathToGitClone>
git clone https://github.com/hbahk/TAOTutorials.git

1.2. Software installations

1.2.1 Python packages

• Useful links

  SNU_AOclass/00-3_Prepare_Python.md at master · ysBach/SNU_AOclass · GitHub

  SNU_AOclass/00-1_Softwares.md at master · ysBach/SNU_AOclass · GitHub

1. Create a new conda environment (optional)

conda create -n tao python numpy scipy pandas jupyter
conda activate tao

2. Install packages via conda

conda install -c conda-forge astropy sep tqdm
conda install -c conda-forge photutils
conda install -c astropy ccdproc astroscrappy specutils

3. Install package via Github repositories

cd <PathToGitClone> 
git clone https://github.com/jrjohansson/version_information.git && git clone https://github.com/astropy/astroquery.git && git clone https://github.com/ejeschke/ginga.git && git clone https://github.com/quatrope/astroalign

cd version_information && pip install -e . && cd ..
cd astroquery && git pull && pip install -e . && cd ..
cd ginga && git pull && pip install -e . && cd .. 
cd astroalign && git pull && pip install -e . && cd .. 

4. Set the python path of your own kernels/editors with this environments

cf) For Spyder users, install spyder-kernels for your version of Spyder following the table in this link Common Illnesses — Spyder 5 documentation. In my case, the version of my Spyder is 5.2.2, so I had to install spyder-kernels=2.2.1.

conda install spyder‑kernels=2.2.1

1.2.2 Source Extractor

• For Linux (or Window) users, please refer to the official documentation: Installing the software.

  For Ubuntu users, for example, simple command will do:

  sudo apt-get install sextractor

• For Mac users, using Homebrew is easiest way, I suppose.

  brew install sextractor

  If you don't have Homebrew intalled yet, then give that a try!

• You can check whether SExtractor is installed or not with the command of:

  sex

  Or if you installed with the apt-get (and other possible distributors) then try

  sextractor

  or

  source-extractor

1.2.3. PSF Extractor

• For Linux (or Window) users, please refer to the official documentation: Installing the software. For Ubuntu users, for example, executing simple command will install this software:

  sudo apt-get install psfex

• For Mac users (Tested with Apple M1 Pro Ventura 13.2.1),

  cd <PathToGitClone>
  git clone https://github.com/astromatic/psfex.git

  Check whether required packages are installed: autoconf, automake, libtool.

  brew info autoconf
  brew info automake
  brew info libtool

  If you are missing one of them, then install with the command brew install <MissingPackage>.

  Then

  cd psfex
  ./autogen.sh

  Check the result and find the pathes of lib and include directory of the OpenBLAS package. You can find their location with command of brew info openblas, if you installed OpenBLAS with Homebrew, which should be the case when you installed SExtractor with Homebrew. Similarly, find lib and include for FFTW, and then try

  ./configure --disable-silent-rules --enable-openblas --with-openblas-libdir="/opt/homebrew/opt/openblas/lib" --with-openblas-incdir="/opt/homebrew/opt/openblas/include" --with-fftw-libdir="/opt/homebrew/opt/fftw/lib" --with-fftw-incdir="/opt/homebrew/opt/fftw/include"

  Here you should put the libdir and incdir with your own pathes.

  Finally,

  sudo make install

  and now you are all set.

1.2.4. GALFIT

Installing GALFIT is an easy task. You can download the compiled execution file from the official website: GALFIT Homepage. Select your operating system and download the file. Then, you can run the program by putting the file in your path, or directly run the program in the directory where the file is located.