ACCOUNTANTS' CONSENT

The Board of Directors
Orbital Sciences Corporation

We consent to the incorporation by reference in the Registration
Statement on Form S-8 dated August 31, 1995 of Orbital Sciences
Corporation of our report dated May 25, 1995, except as to note
8(d) which is at September 29, 1995, with respect to the
consolidated balance sheets of MacDonald, Dettwiler and
Associates Ltd. as at March 31, 1995 and 1994, and the related
consolidated statements of earnings, retained earnings and
changes in financial position for each of the years in the three
year period ended March 31, 1995, which report appears in the
Form 8-K of Orbital Sciences Corporation dated October 19, 1995.



(Signed) KPMG Peat Marwick Thorne

Chartered Accountants

Vancouver, Canada
October 19, 1995