August 1996 Volume 4, No. 6
IUE PROJECT ELECTRONIC NEWSLETTER
NASA-Goddard Space Flight Center (GSFC)
This is an electronic newsletter, edited by Terry Teays, primarily
intended to inform the numerous remote and local users of the IUEDAC software of recent software
updates, as well as let them know about news relating to the IUE project
in general.
IUE Image Processing News
IUESIPS and NEWSIPS Wavelengths
Are you interested in getting very accurate wavelengths in high-dispersion
IUE data? Don't forget that there has been a long-standing small error in
the IUESIPS high-dispersion wavelength scale. This is due to an
out-of-date set of spacecraft orbital elements used to compute the small
(< 4 km/sec) correction for spacecraft velocity to the heliocentric
scale. The IUEDAC has a routine, iuevel, which allows you to
correct this. An article by Lyla Taylor (NASA IUE Newsletter
No. 50, pg. 2, 1993) describes the problem and how to correct it.
You may recall that in the IUESIPS data, we followed the convention of
giving vacuum wavelengths for < 2000 Å and air for > 2000
Å. However in NEWSIPS, we are giving ALL wavelengths in vacuum.
This convention was proposed to and accepted by the I.A.U. to simplify the
handling of space-based data.
- Cathy Imhoff
Recent IUEDAC Software Changes
- 15-Jul
- New experimental programs (used by
search):
isview
- fixes display format problem affecting solaris operating systems
ismenu4
- allows epoch to be recognized when entered after coordinates are
specified
- 26-Jul
- A new version of
iuefx is now available in the
experimental library which allows unix users to specify a different user
name for transferring files.
- 29-Jul
- The experimental versions of
isview and
ismenu4 described above have been implemented.
- 01-Aug
- An experimental version of
crscor is available
which allows users to request hardcopies of, and add comments to, the
final plot display.
- 05-Aug
- The IUE orbital elements table was updated to include entries up to
the end of July, 1996.
- 08-Aug
- An experimental version of
readri is available which is
compatible with the new FITS format to be used for shifted partial-read
raw image NEWSIPS files.
- Randy Thompson
Back to the IUE Data Analysis Center Page
Web Curator
Mr. James Caplinger, Computer
Sciences Corporation
Responsible NASA Organization/Official
Dr. Don West, IUE Operations Scientist