## Default vs User Options Files

Orbfit reads its options from multiple setting files on your machine. Let’s call these the default settings and the user settings. The default settings are read first add can be found in the lib/ folder of wherever you compiled Orbfit on your machine. For me these files are found at ~/Orbfit5.0/lib/*.def
$cd ~/Orbfit5.0/lib/$ ls *.def
bineph.def fitdeb.def fitobs.def impcor.def orbfit.def propag.def reject.def


The land of Conda, Anaconda, Miniconda, Astroconda, AfishcalledConda … can be very confusing if you’re just starting out trying to work out what the <enter expletive> each of these service are and which ones you personally need to install. Let’s begin with some definitions that will hopefully help us out later on. …

OrbFit is a software package used to determine the orbits of asteroids written by the OrbFit Consortium. But it’s very sparsely documented, and can be a little tricky to install, never-mind learning how to use it. Here’s my guide to getting it to successfully install on my mac (macOS Sierra). …

Panstamps was originally designed to download all warp or stacked images found to overlap a given sky-position. This is fine if your objects remain fixed at the same location in the sky, i.e they don’t move! For moving objects, alongside spatially filtering the panstarrs images we want downloaded, we also require a temporal filter. We need to be able to request images at a given sky-position that were taken within a given time range. …

## Healpix Likelihood Map - FITS Binary Table

The Healpix likelihood maps coming from Ligo-Virgo (LV) are in FITS Binary Table format. Here’s an example of the skymap for the second wave detection by LV (GW151226). You can use a tool like Topcat to open the FITS table.