1
                                                                  Exhibit 23.2.3


                              Accountants' Consent


The Board of Directors
Orbital Sciences Corporation and subsidiaries:

We consent to the incorporation by reference in the registration statements on
Forms S-8 (Nos. 33-84296, 33-62277, 33-64517, 333-53585, 333-69887, 333-69885,
and 333-27999) of Orbital Sciences Corporation and subsidiaries of our report
dated January 22, 1999, except as to the second paragraph on Note 4 which is as
of March 23, 2000, relating to the consolidated statements of operations,
stockholders' equity, and cash flows, of Orbital Imaging Corporation and
subsidiaries for the year ended December 31, 1998, which reports appear in the
December 31, 2000 annual report on Form 10-K of Orbital Sciences Corporation.





                                                                        KPMG LLP

Washington, DC
April 16, 2001