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History of the Delta Launch Vehicle



Current Delta News

(What about Delta IV?)
05-Feb-09 | Another equipment failure scrubs launch

The second attempt at launching NOAA-N′ was scrubbed this morning due to a problem with the launch pad system that feeds conditioned air into the payload fairing. Managers do not believe any damage was caused to the spacecraft, but a cursory contamination check will be needed to determine whether any hydrocarbons were introduced into its clean environment. A decision on the next launch opportunity is expected around mid-day Thursday; another launch window opens on Friday at 10:22 UTC.

Update for 21:35 UTC: Air samples from the payload fairing and the ground support system are reported clean, so officials have cleared the way for a Friday morning launch attempt. The weather remains at a 60% chance of violating launch criteria.

04-Feb-09 | NOAA-N′ scrubbed

The first Delta II launch of 2009 will have to wait at least one more day. Today’s launch of NOAA-N′ (“N Prime”) for NASA and the National Oceanic and Atmospheric Administration was scrubbed during the built-in hold at T-minus 15 minutes due to faulty ground support equipment. A routine check of the gaseous nitrogen system at Vandenberg’s SLC-2W found it to be undercharged, a potentially hazardous condition since the system is used to purge the vehicle’s first-stage tanks during detanking operations.

Launch controllers are hopeful for a 24-hour turnaround and the opportunity for a launch early Thursday. Unfortunately, today’s good weather is not expected to last, and the forecast for tomorrow expects an 80% chance of violating launch criteria, with low clouds, rain, and gusty winds. Somewhat better odds are predicted for subsequent launch windows through the weekend.

Update for 22:30 UTC: Engineers have replaced a faulty relay on the gaseous nitrogen purge system, and the weather report has improved somewhat with the potential for thick clouds having a 60% chance of violating launch criteria. A second launch attempt will be made tonight.

28-Oct-08 | Delta flight 336 – COSMO-SkyMed 3

In the last scheduled Delta II launch of 2008, a two-stage Med-Lite vehicle has successfully launched the third satellite in the COSMO-SkyMed constellation for the Italian Space Agency and the Italian Ministry of Defense.  The commercial launch was conducted by United Launch Alliance on behalf of Boeing Launch Services, and took place at Vandenberg Air Force Base SLC-2W on the evening of Friday, 24 October (liftoff time was 02:28:25 UTC, 25-Oct-08).

The flight, taking just under an hour from engine start to spacecraft separation, was the 84th consecutive success for Delta II, and its 43rd commercial launch success.  As usual, Justin Ray of SpaceflightNow.com provided an excellent play-by-play summary of the launch, available here.

Each COSMO-SkyMed satellite features a high-resolution, X-band Synthetic Aperture Radar to perform global Earth observation; data collected by the constellation of four will be provided to both the Italian military for national security, and the Italian scientific community for environmental studies.  The first three satellites in the constellation have been orbited aboard Delta II vehicles; the launcher for COSMO-SkyMed 4, slated for some time in 2010, is yet to be announced.

11-Sep-08 | Delta flight 335 – GeoEye 1

On Saturday, 06 September 2008, a ULA Delta II successfully launched GeoEye 1, a next-generation commercial Earth-imaging satellite. The late-morning launch from Vandenberg Air Force Base was performed under a commercial contract with Boeing Launch Services, with flight hardware and mission services provided by United Launch Alliance.

In a rare occurrence, the weather was reported as being 100% favourable for launch, with only a brief concern about lower-level winds that cropped up and vanished without issue.  Ironically, the launch site was shrouded by a heavy ground fog that made the rocket difficult to distinguish in several of the launch pad camera views.  (This fog was not a constraint for launch.)

Following the latest in a long series of uneventful terminal countdowns, the two-stage Med-Lite Delta II (model 7420-10) lifted off from SLC-2W at exactly 11:50:57.502 PDT, punching through the low fog layer and streaking into a clear central California sky.  After dropping its ground-lit booster motors downrange of several offshore oil-drilling platforms, and completing its first-stage burn and two second-stage burns, the Delta II rocket deployed its 4310-pound payload into a nominal, circular orbit just under 59 minutes after launch.

For a complete play-by-play of the launch, Justin Ray of Spaceflight Now delivered this Mission Status Report.  Additionally, GeoEye has archived the television feed of the launch.

GeoEye 1 is touted as “the world’s highest resolution, commercial Earth-imaging satellite.”  It will provide a ground resolution of 41 centimetres in black-and-white, 165 cm in colour, and have the capacity to pinpoint its ground targets within about 3 metres of their actual position.  One obvious customer will be the U.S. military, which will be able to share its imagery with its allies without the concerns that accompany classified data from American spy satellites.

In addition, the launch vehicle’s first stage carried a Google logo; that company has an exclusive contract with GeoEye and will be the only online search-and-mapping site to receive GeoEye images.  The data will be incorporated into both Google Earth and Google Maps.

24-Jun-08 | Delta flight 334 – OSTM/Jason-2

For the second time in less than nine days, a Delta II has launched a new science probe for NASA.

This time around it was OSTM/Jason-2; the forgettable, agglomerated name comes from Ocean Surface Topography Mission and the fact that this is a follow-on to the Jason-1 satellite (launched in December 2001 on Delta 289). Jason-2 will continue measurement of global ocean surface topography for at least another three years, and is a joint project of NASA, NOAA, CNES, and EUMETSAT.

The dead-of-night launch took place early Friday morning, 20 June, at Vandenberg Air Force Base’s SLC-2W and saw a typically uneventful countdown. The mobile service tower was kept in place until first stage fueling was complete, since the wind was gusty early in the evening. This subsided well before the launch window opened and the rocket left the pad at an official range time of 07:46:25.192 UTC.

Just over 55 minutes later, the tracking station at Hartebeesthoek, South Africa, provided an odd combination of ratty data (according to Telemetry Manager Marc Lavigne, welcome back to the mic)—and a perfectly clear engineering camera view as the spacecraft separated from the Delta II second stage and unfurled its solar panels.

This flight marked the 82nd success in a row for the venerable Delta II.

11-Jun-08 | Delta flight 333 – GLAST

NASA’s Gamma-ray Large Area Space Telescope (GLAST) is now in its operational orbit, thanks to a successful launch aboard a Delta II-Heavy today. The Delta II launch record now stands at 81 consecutive successes, an unprecedented testimonial of reliability that began over 11 years ago.

The launch, at first slated for mid-May, was delayed for more than three weeks due to stacking issues with the Delta II launch vehicle. Installation of the second stage was delayed when an H-beam adapter, part of the SLC-17B hoisting system, was fractured during prep work around 5 April. Although the second stage was undamaged, a new H-beam had to be manufactured and tested. Later, a 5 June launch date was postponed when the Delta II’s Flight Termination System battery showed signs of flakiness and was swapped out.

Today there were no major issues with the vehicle or spacecraft, although the tracking station at Antigua went offline for a while, resulting in a 20-minute delay in coming out of the T-minus 4 minutes built-in hold. Although the 115-minute launch window afforded plenty of slack for the extended hold, the weather, partly cloudy and breezy, was threatening to worsen in the early afternoon. Fortunately, no other issues arose and the Delta II-Heavy was able to liftoff at an official range time of 12:05:00.521 EDT.

The two-stage 7920 rocket, the fifth Delta II to use upsized GEM-46 solid motors for extra boost, thundered off the pad and streaked through the scattered cloud deck, passing each of its scheduled flight events with precision. The first and second stage burns totaling about ten-and-a-half minutes were followed by a 55-minute coast phase, and then a fairly brief 64-second burn to circularise the orbit around 300 nautical miles altitude. GLAST was released about 75 minutes after launch while within sight of the Kwajalein tracking station, and shortly thereafter it unfurled its solar panels.

After successfully deploying the spacecraft, the Delta second stage performed a gentle evasion manoeuvre using its helium thrusters, and later completed a pair of additional burns using its primary engine—one for further evasion of the spacecraft, and one to deplete its hypergolic propellants. This final burn left the stage in an elliptical orbit with a 99 nautical mile perigee, which will significantly reduce the time until it reenters the atmosphere and burns up.

GLAST carries the most advanced instrument ever built to study some of the universe’s most dynamic and cataclysmic events—supermassive black holes, merging neutron stars, and other phenomena that produce highly energetic gamma-ray radiation. After a 60-day checkout and calibration period, the $693 million telescope is expected to spend at least five years performing both a full sky survey and in-depth, targeted observations.

25-May-08 | Success!

Phoenix is on Mars!

The lander survived its arduous EDL phase and has transmitted signals confirming its safe arrival on the Martian northern plains. Follow-up subsystem checks have yet to complete, but the nail-biting part is over.

Congratulations to NASA-JPL, the University of Arizona, and all their contractors and contributors!

16-May-08 | On course for Mars

Phoenix is nearing the end of its cruise phase, and will arrive at Mars on Sunday, 25 May. Using a heat shield, parachute, and deceleration thrusters, the EDL (entry, descent, and landing) phase will last about seven minutes and is expected to conclude with a gentle touchdown upon spidery landing gear around 23:53 UTC, Earth received time.

Many museums and planetaria around the United States will host landing parties, allowing visitors to watch live video of mission controllers staring nervously at computer screens, while scientists stand by ready to discuss the mission and answer questions. If landing is successful, Phoenix will then begin a three-month surface operations phase, during which it will explore for water ice in the soil of the Martian north pole. Phoenix was launched aboard Delta 325 on 4 August 2007.

16-May-08 | Next launch

NASA’s Gamma-ray Large Area Space Telescope (GLAST) is now scheduled to launch on 3 June.  The flight was delayed from 16 May due to an unspecified issue that arose during stacking of the Delta II-Heavy’s second stage.

15-Mar-08 | Delta flight 332 – NAVSTAR IIR-19 (M6)

A Delta II 7925 early this morning continued Delta’s record-setting string of successful flights with a satellite for the U.S. Air Force’s Global Positioning System.

The weather at SLC-17A was fairly lousy for much of the evening as the terminal countdown got under way, with overcast skies and intermittent rain causing a brief delay to first stage oxidizer tanking operations. As the count continued, no major issues with the vehicle were worked. For a while the range was no-go for an issue this author believes was a risk of toxic fumes getting blown inland in a self-destruction event, but ultimately this was closed and the only delay was a one-minute COLA period at the opening of the fourteen-minute window.

The standard three-stage Delta II lifted off at 02:10 EDT (06:10 UTC), deploying the NAVSTAR IIR-19 satellite 68 minutes later. As commonly happens, a ratty telemetry signal late in the flight led to a brief delay in the declaration of mission success. Nevertheless, the rocket got the job done, extending Delta’s launch record to 80 successes in a row.

Delta II now has a 133 of 135 success rate, one of the best in the industry. Meanwhile, the NAVSTAR IIR-19 will fire its AKM within the next few days to enter Plane A, Slot 4, where it will replace IIA-15, a fifteen-year-old satellite that has more than doubled its design lifetime; IIA-15 still has some life left in it, and will be moved into a “storage” orbit as an available spare.

IIR-19 is the sixth “modernized” GPS satellite, which is upgraded with two additional encrypted military signals for improved accuracy and resistance to signal jamming, along with an added civilian signal. Two more NAVSTAR IIR(M) launches are scheduled for Delta II before the end of the year, at which time the GPS/Delta era will reach its conclusion. To date, all operational GPS satellites, some 47 including today’s launch, have flown aboard Delta II.

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