DELTA 2 R/B(2)
| Launched | 2 August 2004 | 
| Flight ended | – | 
| Status | Unknown | 
| Launch site | Air Force Eastern Test Range, Florida, USA | 
| Owner | United States | 
| NORAD ID | 28392 | 
| COSPAR ID | 2004-030C | 
| Observing | 
Timeline
| 2004 Aug 3 | – | Launch from Cape Canaveral SLC-17B | 
| 2005 Aug 2 | – | Gravity assist flyby of Earth | 
| 2006 Oct 24 | – | Gravity assist flyby of Venus | 
| 2007 Jun 5 | – | Gravity assist flyby of Venus | 
| 2008 Jan 14 | – | Flyby of Mercury | 
| 2008 Oct 6 | – | Flyby of Mercury | 
| 2009 Sep 29 | – | Flyby of Mercury | 
| 2011 Mar 18 | – | Insertion into orbit around Mercury | 
| 2015 Apr 30 | – | Spacecraft destroyed on impact with Mercury |