1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 -------------------------- FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 28, 1997 -------------------------- ORBITAL SCIENCES CORPORATION DELAWARE 0-18287 06-1209561 (State of incorporation) (Commission File Number) (I.R.S. Employer I.D. No.) 21700 ATLANTIC BOULEVARD DULLES, VIRGINIA 20166 (703) 406-5000 (Address and telephone number of principal executive offices) 2 ITEM 5. OTHER EVENTS On November 28, 1997, Orbital Sciences Corporation ("Orbital") and its subsidiary, Magellan Corporation ("Magellan"), signed an Agreement and Plan of Merger (the "Agreement") with Ashtech Inc. ("Ashtech"), a privately-held developer and supplier of high-performance Global Positioning System and related satellite navigation products, components and technologies. Under the terms of the Agreement, shares of Magellan common stock and cash in the amount of $25 million will be exchanged for all issued and outstanding securities of Ashtech. In the aggregate, after giving effect to the merger, Orbital and Ashtech security holders will receive 66% and 34%, respectively, of the equity ownership of Magellan on a fully diluted basis. The transaction is subject to customary closing conditions, including review under the U.S. Government's Hart-Scott-Rodino procedures. -1- 3 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ORBITAL SCIENCES CORPORATION Date: December 8, 1997 By: /s/ Jeffrey V. Pirone --------------------- Jeffrey V. Pirone Senior Vice President and Chief Financial Officer -2-