Observation Data

The surveys for MIRIS main mission had completed in 2015 March. Some useful informations are available in the presentation files from MIRIS Workshop 2015 and MIRIS Workshop 2017.

The all fields observed with MIRIS are shown on the integrated source flux map of the 2MASS All-Sky Data Release in the Galactic coordinates. The blue circles are the fields observed with I-filter and the red with PAAL-filter. Most fields observed with I- and PAAL-filters are also observed with H- and PAAC-filters, respectively. Hovering mouse cursor over a circle shows the field name. Note that some field names are specific to the MIRIS observations.

Observation Search Tool

You can search for and download the MIRIS observation data using the following form:

Object name is resolved by Sesame.
e.g., "83.63 22.01", "05h34m31s +22d00m52.0s", "05:34:31 +22:00:52"

Data User's Manual

The data files distributed through the above Observation Search Tool are in the FITS format and produced by stacking sky-exposure frames obtained during each observations. Size of each data file is about 1.3 MB. The stacking procedure is performed by Montage software. Each FITS file contains 4 HDUs (header and data units):

  • Primary HDU: Contains header, but no data. Header contains the observation and data processing informations.
  • Image HDU (COADD): Median-coadded image.
  • Image HDU (COADAREA): Map of coadded pixel area values.
  • Image HDU (COUNT): Map showing counts of how many times each pixel was overlapped by the input images.

For the details of the data processing, please refer to the presentation, “MIRIS Data Analysis and Processing Status” in MIRIS Workshop 2017. Data users should pay attention to the following artifacts of the MIRIS observation data:

  • Sharp and broad stripe patterns due to bright stars
  • Background increment due to the stray light of the Earth's thermal radiation
  • Shadowing over the images taken from late March to early August 2014 due to the filter wheel misalignment
  • Complex, extended PSF for bright stars on the PAAC-filter images
  • Asymmetric, elongated PSF (point spread function)

These are described in the presentation mentioned above.

We can provide data files (about 80 MB for each) before the stacking on request.

The User Manual of the MIRIS Space Observation Camera Data Reduction Pipeline is published as a technical report (No. 13-001-111) of KASI and available through this link. Note that the report is written in Korean. Updated, English version will be available sooner or later.