Magdalena Ridge Calibrated Data Collection Overview

Data Abstract
=============
We obtained images of the (65803) Didymos system and supporting calibration 
images with the MRO2K CCD on the MRO 2.4m Telescope at the Magdalena Ridge 
Observatory (MRO). These images were taken in order to determine the orbit 
period of Dimorphos, the satellite of Didymos. This collection consists of 
the Magdalena Ridge calibrated images, which include calibrated sky frames 
that have been bias subtracted, dark subtracted, and flat field corrected, 
as well as median combined stacks of bias, dark, and flat field images used 
to create master calibration frames.

Data Set Overview
=================
Raw image data (see data_mroraw collection) are calibrated in three steps:
(1) a median combined master bias frame is subtracted from each sky image, 
(2) the exposure-scaled dark frame is then subtracted, and (3) a median 
combined, normalized flat field is divided into each sky frame. The IRAF 
ccdproc package is used to perform these tasks.

Naming Convention
=================
Calibrated images consist of a single fits file containing the  calibrated 
image and an associated XML file. Sky images are named according to the 
same naming convention as Raw images, using 'fm' as the product type. See 
below.

<product type><yymmdd>.<image counter>.<ext> 

where:
<product type> is the product type; "m" for raw data, "fm" for processed 
(calibrated) data

<yymmdd> is the year, month, day of the observing session in UT

<image counter> is a four-digit image counter for observing session 
starting at 0001, reset for each night of observation

<ext> is the file extension. ".fits" for FITS file format, ".xml" for the 
PDS4 XML label

Ex. fm210413.0036.fits is the processed image product for a 2021-04-13 
observing session. It is the 36th image generated on that UT date.

Master calibration frames follow a different naming convention:
bias_<yymmdd>.<ext>
dark_<yymmdd>.<ext>
flat_<filter>_<yymmdd>.<ext>

where:
<yymmdd> is the year, month, day of the observing session in UT

<filter> refers to the broadband filter in which the observations were 
obtained and can be "r", "v", or "vr"

<ext> is the file extension. ".fits" for FITS file format, ".xml" for the 
PDS4 XML label