Sub-group on the Densification of the Optical Frame
                             Newsletter 4
                             July 6, 1999


Dear Colleagues,
   A paragraph was mistakenly omitted from my last message.  Newsletter 4
should read as follows.



  This is the fourth newsletter of the  Sub-group on the Densification
of the Optical Reference Frame.  

Several projects have been progressing; updates are given under the
"Projects" page on the website, whose address is found below.
I invite each of you to review this website, since this is
the main source for distributing information about committee members and
important projects.  As always, I am open to suggestions about the 
website, including posting news on other projects which may be 
important to the group. 

The following has changed under the "Projects" page since the last newsletter:
  1) The UCAC-S description has been updated, and it has been decided  
     that a preliminary catalog will be released.
  2) The SPM description has been expanded to include version 2.0.
  3) The FAME satellite description has been updated, along with a new
     website address.
  4) The DIVA satellite homepage has been updated.
  5) The Tycho-2 project description has been added.

                  Sincerely,
                                       
                  Sean Urban
                  U.S. Naval Observatory
                  July 6, 1999
                  http://aries.usno.navy.mil/ad/dens_wg/dens.html