With this amendment to ROSES-2005, NASA announces new due dates for the
Planetary Instrument Definition and Development program (PIDDP) described
in Appendix B.14. The due date for Notices of Intent to propose (NOIs) is
changed from June 22, 2005, to July 15, 2005. The due date for proposals
is changed from August 5, 2005, to September 16, 2005.

On or about June 23, 2005, Amendment No. 21 to NASA Research Announcement
"Research Opportunities in Space and Earth Sciences" (NNH05ZDA001N) will be
posted on its homepage Web site at http://nspires.nasaprs.com/ (select
"Solicitations" then "Open Solicitations" then "NNH05ZDA001N").

The due dates for the Planetary Instrument Definition and Development
program (PIDDP) described in Appendix B.14 have been changed. The due date
for Notices of Intent to propose (NOIs) is changed from June 22, 2005, to
July 15, 2005. The due date for proposals is changed from August 5, 2005,
to September 16, 2005.

Recognizing that selections from the 2004 solicitation for PIDDP were not
announced prior to June 22, these changes are made in anticipation of
announcements being made prior to July 15.

Tables 2 and 3 of the ROSES-2005 Summary of Solicitation have been updated
to reflect the new due dates.

Further information about this Program Element is available from Dr.
Marilyn Lindstrom, Solar System Division, Science Mission Directorate, NASA
Headquarters, Washington, DC 20546-0001; Telephone: (202) 358-1254; E-mail:
Marilyn.Lindstrom1@....