JASMINE mini-Mock survey dataset

Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a satellite mission that measures the precise positions and motions of stars in the Galactic nucleus region and inspects a periodic subtle dimming caused by exoplanets orbiting around M-type dwarf stars.

We have generated small-scale JASMINE Galactic Centre survey data, JASMINE mini-Mock Survey (JmMS) data, for testing and validating JASMINE astrometric data analysis, especially for correction of optical distortion. For preliminary software validation, we design a simplified small-scale mock survey for “plate analysis”, where stellar motions and the variation in image distortion are treated as negligible within a dataset.

To this end, we select a 1′×1′-target region around the Galactic center. We assume that JASMINE observes 4 fields per one orbit. Two of these fields overlap half of their field-of-view in the Galactic longitude direction, and another two fields overlap by half of their field-of-view in the Galactic latitude direction. The fields of these observations are randomly selected, but at least one of these 4 fields in one orbit covers the selected target region. In this mini-mock survey data, we consider 100 orbits. These data would be valuable for us to validate whether our astrometric analysis code can achieve the expected astrometric accuracy by correcting the image distortion using the assumption that the stellar position in the sky and the higher-order image distortion do not change during the observational time, ∼ 50 min, of one orbit. We summarise how to generate the mock data from the mini JASMINE Galactic Centre survey.

The JASMINE mini-survey dataset contains the following files:

readme.pdf: A document explaining how the dataset is generated.

jasmine_validation_augumented_source_catalog.fits.gz: A FITS binary table of the source catalog that contains the ground truth astrometric parameters.

jasmine_validation_reference_catalog.fits.gz: A FITS binary table of the reference catalog that contains the astrometric parameters resampled from the source catalog.

jasmine_validation_survey_strategy.fits.gz: A FITS binary table of the survey strategy that describes the observation schedules with the telescope pointings and position angles.

jasmine_validation_observation-vanilla_e4.0_20240530.tar.gz: An archive of the JmMS dataset in case the telescope has no image distortion and the focal length does not change throughout the mission. The measurement errors are set to ~4.0 mas for all the sources.

jasmine_validation_observation-distortion_e4.0_20240602.tar.gz: An archive of the JmMS dataset in case the telescope suffers from image distortion and the focal length changes with every plate. The measurement errors are set to ~4.0 mas for all the sources.