The primary reference for the Copernicus Spectral Atlas of Iota
Hercules is Upson, Walter L. and Rogerson, J. B.,
The summary information that follows is taken from that reference.
The observations obtained to construct this atlas were obtained primarily
during the periods between 1974 July 11 and September 12. The spectral
atlas covers wavelengths from 993.3 Å to 1422.2 Å (second
order) and 1417.9 Å to 1467.7 Å (first order), with a spectral
resolution of 0.1 Å in first order and 0.05 Å in second order.
The scans were made in the U1 detector. A complete description of the
Copernicus science instrument may be found in Rogerson et
Wavelengths were corrected for Doppler shifts due to (a) the heliocentric
radial velocity of Iota Her, (b) the Earth's heliocentric velocity in the
direction of Iota Her, and (c) the component of the satellite geocentric
orbital velocity in the direction of Iota Her. The counts from the source
were corrected for counts due to cosmic rays and trapped charge particles,
guiding errors and scattered light within the spectrometer. No correction
was made for the wavelength variations in the spectrometer sensitivity.
The atlas is a compilation of 29 separate scans of specific spectral
regions. There are a total of two files relating to the Iota Her Spectral
Atlas. File 1 is the 2nd order spectrum and file 2 is the first order
FILENAME ROWS FIELDS WVE_FRST WVE_LST TYPE
iotaher1.fts 20089 6 999.334 1430.177 2nd order
iotaher2.fts 945 6 1417.849 1467.682 1st order