DELTA 2 R/B(1)
| Launched | 2 August 2004 |
| Flight ended | 1 May 2005 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 28390 |
| COSPAR ID | 2004-030B |
| 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 |