X0202 3 2006-01-26 0 0000820736 ORBITAL SCIENCES CORP /DE/ ORB 0001351694 Herlick Susan 21839 ATLANTIC BOULEVARD DULLES VA 20166 0 1 0 0 Sr. V.P., G.C. and Secy Common Stock 6000 D Stock Option (right to buy) 12.25 2010-04-26 Common Stock 15000 D Stock Option (right to buy) 4.00 2011-04-24 Common Stock 7500 D Stock Option (right to buy) 5.79 2013-05-15 Common Stock 23525 D Stock Option (right to buy) 7.08 2013-06-23 Common Stock 10000 D Stock Option (right to buy) 12.05 2010-05-18 Common Stock 7000 D Represents restricted stock units granted under the issuer's 2005 Stock Incentive Plan. The restricted stock units vest in 1/3 increments on April 26, 2006, April 26, 2007 and October 28, 2008. The option became fully vested and exercisable as of January 20, 2002. The option became fully vested and exercisable as of February 6, 2003. 15,684 shares are fully vested and exercisable. The remaining 7,841 shares will vest and become exercisable on May 15, 2006. 6,667 shares are fully vested and exercisable. The remaining 3,333 shares will vest and become exercisable on June 23, 2006. The option became fully vested and exercisable as of October 26, 2005. /s/ Susan Herlick 2006-02-02