AstroLab CCD Images
CCD images taken with the telescopes are saved on the dome workstations under the "/data/current/" directory. Each directory is encoded with the observing date, e.g. on 2020 April 08 the directory would be created as 20_04_08. In each dated directory the images are numbered starting at 0001.
As well as being saved locally on the dome workstations, the CCD images are also saved on Capella. This server runs in the background keeping the Astrolab ticking over; transferring the CCD images into the archive, telescope logging, weather monitoring, etc. Capella serves a directory via NFS to each dome workstation, i.e. "/remote/current/TELESCOPE" directory where TELESCOPE is the telescope name (draco2, east-14, west-14, far-east-16, etc).
Capella handles the initial processing of the CCD images and transfer these to AstroLab fileserver (Canopus).
Canopus File ServerCanopus serves the following disks to the lab workstations via automounted NFS:
/mnt/archive # archived CCD images READ ONLY /mnt/64bin # data reduction scripts, etc READ ONLY /mnt/cats # star catalogue data READ ONLY
Canopus also gathers any Astrolab images taken with the La Palma p5tm telescope from the previous night at 14:30 each day and puts these in the archive.
The CCD images in the archive are stored in following file structure:
Three images for each Durham exposure are initially stored in the archive.
The "ad" images are only exist when a successful astrometric calibration to Refcat2 catalog has been made; prior to mid-2019 the USNOA2 was used as the base catalogue. The details of the astrometric calibration can be found in the FITS headers. The "A" column in the online telescope logs indicate the number stars used for the astrometric calibration; a dash indicates that this calibration was not successful.
On Your Lab Workstation
For your data analysis on your workstation create a directory structure under the Astrolab home directory (/home/astrolab/). If required copy your images images across from Canopus, e.g.
mkdir MY_PROJECT cd MY_PROJECT mkdir 20_02_08 cd 20_02_08 rsync -av /mnt/archive/far-east-20/2020/20_04_08/* . ^ / \ Don't forget the "."rsync is "a fast and extraordinarily versatile file copying tool".