NIC1 Narrow-band Earth Flats

Details NIC1 Narrow-band Earth Flats NIC1 Narrow-band Earth Flats

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nicm.rept...11g&link_type=abstract

Instrument Science Report NIC 98-011, 10 pages

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

We have created a set of 8 NIC1 narrow-band flats by combining images of streaked Earth flats from calibration program 7775. For each filter, we have selected images free of saturation and apparent anomalies and combined them using MSSTREAKFLAT in STSDAS to form one set of flatfield reference files. The same images were also combined with a weighted average using MSCOMBINE to make another set of flats. Those created with MSSTREAKFLAT yielded similar photometric results to the lamp flats and fewer streaks than the mscombine flats. The processing of the flats, preliminary image analysis of the combined flats, and photometric analysis using a solar analog (P330E) and a white dwarf (G191) are discussed in this instrument report. We also discuss several new anomalies found in the Earth flat data. The NICMOS team is currently obtaining a full complement of narrow-band lamp flats for all of the NIC1 filters. The Earth flats are available by contacting D. Gilmore.

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