Jump to content

WorldView-4: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
Update launch to 6 November.
launch date moved
Line 17: Line 17:
| power = <!--end-of-life power, in watts-->
| power = <!--end-of-life power, in watts-->


| launch_date = {{start-date|6 November 2016}}<ref name="sfnow20161025" />
| launch_date = {{start-date|11 November 2016}}<ref name="ula3nov2016" />
| launch_rocket = [[Atlas V]] 401, AV-062<ref name="sfn-launch">{{cite web |url=https://spaceflightnow.com/launch-schedule/ |title=Launch Schedule |work=Spaceflight Now |date=18 September 2016 |archiveurl=https://web.archive.org/web/20160919052402/https://spaceflightnow.com/launch-schedule/ |archivedate=18 September 2016}}</ref>
| launch_rocket = [[Atlas V]] 401, AV-062<ref name="sfn-launch">{{cite web |url=https://spaceflightnow.com/launch-schedule/ |title=Launch Schedule |work=Spaceflight Now |date=18 September 2016 |archiveurl=https://web.archive.org/web/20160919052402/https://spaceflightnow.com/launch-schedule/ |archivedate=18 September 2016}}</ref>
| launch_site = [[Vandenberg Air Force Base|Vandenberg]] [[Vandenberg AFB Space Launch Complex 3|SLC-3E]]<ref name="sfn-launch"/>
| launch_site = [[Vandenberg Air Force Base|Vandenberg]] [[Vandenberg AFB Space Launch Complex 3|SLC-3E]]<ref name="sfn-launch"/>
Line 72: Line 72:
The [[Canyon Fire (2016)|Canyon Fire]], a wildfire that burned over {{convert|12742|acre|ha|order=flip}} on the southern section of Vandenberg,<ref name="sbindie20160929">{{cite news |url=http://www.independent.com/news/2016/sep/29/vandenberg-beats-back-four-separate-fires/ |title=Vandenberg Beats Back Four Separate Fires |work=Santa Barbara Independent |first=Keith |last=Hamm |date=29 September 2016 |accessdate=29 September 2016}}</ref> resulted in a further launch delay so that the base could "concentrate {{interp|their|orig=our}} resources on the situation at hand."<ref name="sfinside20160918">{{cite news |url=http://www.spaceflightinsider.com/organizations/ula/nearby-wildfire-prompts-delay-in-atlas-v-launch/ |title=Nearby wildfire prompts delay in Atlas V launch |work=Spaceflight Insider |first=Derek |last=Richardson |date=18 September 2016 |accessdate=18 September 2016}}</ref> As a result of scheduling availability on the [[Western Range]], the flight was rescheduled for 26 September.<ref name="sfinside20160918" /> Continued efforts in fighting the Canyon Fire caused an indeterminate delay of the launch to no earlier than October 2016.<ref name="sputnik20160922" /> Four additional fires of varying sizes broke out between 22 and 27 September; while all were contained by the end of the 27th, base commander John Moss stated that until all facilities and instrumentation could by surveyed, no preliminary launch date could be determined.<ref name="noozhawk20160927">{{cite news |url=https://www.noozhawk.com/article/vandenberg_afb_beefs_up_security_in_wake_of_fires_damage_still_unknown |title=Vandenberg AFB Beefs Up Security In Wake of Fires; Damage Still Unknown |work=[[Noozhawk]] |first=Janene |last=Scully |date=27 September 2016 |accessdate=29 September 2016}}</ref><ref name="smtimes20160928">{{cite news |url=http://santamariatimes.com/vafb-commander-addresses-fires-at-town-hall-forum/article_521eef13-7c39-5010-8bdd-c79b12e21f55.html |title=VAFB commander addresses fires at town hall forum |work=Santa Maria Times |first=Willis |last=Jacobson |date=28 September 2016 |accessdate=29 September 2016}}</ref>
The [[Canyon Fire (2016)|Canyon Fire]], a wildfire that burned over {{convert|12742|acre|ha|order=flip}} on the southern section of Vandenberg,<ref name="sbindie20160929">{{cite news |url=http://www.independent.com/news/2016/sep/29/vandenberg-beats-back-four-separate-fires/ |title=Vandenberg Beats Back Four Separate Fires |work=Santa Barbara Independent |first=Keith |last=Hamm |date=29 September 2016 |accessdate=29 September 2016}}</ref> resulted in a further launch delay so that the base could "concentrate {{interp|their|orig=our}} resources on the situation at hand."<ref name="sfinside20160918">{{cite news |url=http://www.spaceflightinsider.com/organizations/ula/nearby-wildfire-prompts-delay-in-atlas-v-launch/ |title=Nearby wildfire prompts delay in Atlas V launch |work=Spaceflight Insider |first=Derek |last=Richardson |date=18 September 2016 |accessdate=18 September 2016}}</ref> As a result of scheduling availability on the [[Western Range]], the flight was rescheduled for 26 September.<ref name="sfinside20160918" /> Continued efforts in fighting the Canyon Fire caused an indeterminate delay of the launch to no earlier than October 2016.<ref name="sputnik20160922" /> Four additional fires of varying sizes broke out between 22 and 27 September; while all were contained by the end of the 27th, base commander John Moss stated that until all facilities and instrumentation could by surveyed, no preliminary launch date could be determined.<ref name="noozhawk20160927">{{cite news |url=https://www.noozhawk.com/article/vandenberg_afb_beefs_up_security_in_wake_of_fires_damage_still_unknown |title=Vandenberg AFB Beefs Up Security In Wake of Fires; Damage Still Unknown |work=[[Noozhawk]] |first=Janene |last=Scully |date=27 September 2016 |accessdate=29 September 2016}}</ref><ref name="smtimes20160928">{{cite news |url=http://santamariatimes.com/vafb-commander-addresses-fires-at-town-hall-forum/article_521eef13-7c39-5010-8bdd-c79b12e21f55.html |title=VAFB commander addresses fires at town hall forum |work=Santa Maria Times |first=Willis |last=Jacobson |date=28 September 2016 |accessdate=29 September 2016}}</ref>


Repairs were made to the base's infrastructure affected by the wildfire, including power and communications, and the flight was scheduled for 6 November.<ref name="sfnow20161025">{{cite news |url=https://spaceflightnow.com/2016/10/25/california-atlas-5-launch-delayed-by-wildfire-finally-rescheduled/ |title=California Atlas 5 launch that was delayed by wildfire finally rescheduled |work=Spaceflight Now |first=Justin |last=Ray |date=25 October 2016 |accessdate=31 October 2016}}</ref>
Repairs were made to the base's infrastructure affected by the wildfire, including power and communications, and the flight was scheduled for 11 November.<ref name="ula3nov2016">{{cite web |url=https://twitter.com/ulalaunch/status/793885049745707008/ |title=#WV4 update: #AtlasV WorldView-4 launch now scheduled for Nov. 11. Launch window is 10:30-10:46amPST. @DigitalGlobe |publisher=[[United Launch Alliance]]|date=3 November 2016 |accessdate=3 November 2016}}</ref>


== Instrument ==
== Instrument ==

Revision as of 19:39, 3 November 2016

WorldView-4
NamesGeoEye-2
Mission typeEarth observation
OperatorDigitalGlobe
COSPAR ID2016-067A Edit this at Wikidata
SATCAT no.41848Edit this on Wikidata
Websitehttp://worldview4.digitalglobe.com
Mission durationPlanned: 7+ years
Spacecraft properties
BusLM-900[1]
ManufacturerLockheed Martin Space Systems[1]
Launch mass2,485 kg (5,479 lb)[2]
Dimensions7.9 × 5.3 m (26 × 17 ft)[3]
Start of mission
Launch date11 November 2016 (2016-11-11)[4]
RocketAtlas V 401, AV-062[5]
Launch siteVandenberg SLC-3E[5]
ContractorUnited Launch Alliance
Orbital parameters
Reference systemGeocentric
RegimeSun-synchronous[3]
Perigee altitude617–681 km (383–423 mi)[3][6]
Apogee altitude617–681 km (383–423 mi)[3][6]
Period97 minutes[3]
Repeat interval3 days[6]
Velocity7.5 km/s (16,800 mph)[6]
EpochPlanned
Main telescope
NameGeoEye Imaging System-2
Diameter1.1 m (3.6 ft)[7]
WavelengthsPanchromatic: 450-800 nm[3]
Multispectral: 450-920 nm[3]
ResolutionPanchromatic: 31 cm (12 in)[3]
Multispectral: 124 cm (49 in)[3]
DigitalGlobe fleet

WorldView-4, previously known as GeoEye-2, is a planned third generation commercial Earth observation satellite scheduled to launch in November 2016. The spacecraft will be operated by DigitalGlobe. With a maximum resolution of 31 cm (12 in), WorldView-4 will provide similar imagery as WorldView-3, the highest resolution commercially available at the time of its launch.[8]

History

Work on GeoEye-2 began in October 2007 when commercial imagery company GeoEye selected ITT Corporation to begin work on long lead-time items for the satellite camera system.[9][10] In March 2010, an initial contract for construction of the spacecraft was awarded to Lockheed Martin Space Systems, which previously built the Ikonos imaging satellite.[11] At the time, GeoEye-2 was planned for launch in late 2012.[12] The spacecraft's preliminary design review was completed in November 2010, while its critical design review was completed in June 2011.[13][14]

Lockheed Martin issued a contract to ITT Corporation in August 2010 to continue work on the camera system.[10] Its critical design review was completed in March 2011.[15] The system was delivered to Lockheed in April 2012,[16] and was mated to the spacecraft bus the following month.[17]

DigitalGlobe agreed to purchase GeoEye in July 2012,[18] and finalized the merger in January 2013.[19] At the time, each company had a satellite being prepared for launch: WorldView-3 and GeoEye-2. Because WorldView-3 offered multiple short-wavelength infrared channels in addition to the standard panchromatic and multiwavelength channels, the company chose to proceed with its launch and to place GeoEye-2 into storage.[20]

In July 2014, DigitalGlobe announced that GeoEye-2 had been renamed to WorldView-4 to better match the company's branding, and that, due to a projected increase in product demand, the spacecraft's launch had been scheduled for mid-2016.[21][22] The total cost of the spacecraft, including insurance and launch, is estimated at US$835 million.[23]

Launch

WorldView-4 is scheduled for launch no earlier than October 2016 from Vandenberg Air Force Base Space Launch Complex 3E.[24] It will launch aboard an Atlas V rocket in the 401 configuration, serial number AV-062, provided and administered by United Launch Alliance.[5] This is the same rocket that had been scheduled to launch the InSight Mars lander, which was delayed until 2018.[25] The rocket had been erected at the Vandenberg launch pad on 16 December 2015 for the InSight mission; after the WorldView-4 mission took the place of InSight, the rocket was allowed to remain vertical at the pad protected by its mobile service tower.[2] The WorldView-4 payload was fixed atop the rocket during the second week of September 2016.[2]

Originally scheduled for launch on 29 June 2016, the flight was rescheduled to 15 September and then to 16 September.[5] During countdown on 16 September, the launch was scrubbed due to a liquid hydrogen leak in the ground support equipment resulting in an ice ball forming on an umbilical cable. The launch was rescheduled for 18 September to allow for the replacement of a fill-and-drain valve, determined to be the cause of the leak.[26]

The Canyon Fire, a wildfire that burned over 5,157 hectares (12,742 acres) on the southern section of Vandenberg,[27] resulted in a further launch delay so that the base could "concentrate [their] resources on the situation at hand."[28] As a result of scheduling availability on the Western Range, the flight was rescheduled for 26 September.[28] Continued efforts in fighting the Canyon Fire caused an indeterminate delay of the launch to no earlier than October 2016.[24] Four additional fires of varying sizes broke out between 22 and 27 September; while all were contained by the end of the 27th, base commander John Moss stated that until all facilities and instrumentation could by surveyed, no preliminary launch date could be determined.[29][30]

Repairs were made to the base's infrastructure affected by the wildfire, including power and communications, and the flight was scheduled for 11 November.[4]

Instrument

The spacecraft's telescope is called the GeoEye Imaging System-2,[31] designed and built by ITT Corporation.[16] The telescope mirror is 1.1 m (3.6 ft) in diameter.[7] It will be able to provide panchromatic images at a highest resolution of 31 centimeters per pixel (12 in/px), and multispectral images at 124 centimeters per pixel (49 in/px).[3] Multispectral imagery will be available in red, green, blue and near-infrared channels.[3]

References

  1. ^ a b "WorldView 4 (WV 4, GeoEye 2)". Gunter's Space Page. Retrieved 19 March 2016.
  2. ^ a b c Ray, Justin (14 September 2016). "Idled by Range facility rework for months, Vandenberg ready to launch again Friday". Spaceflight Now. Retrieved 18 September 2016.
  3. ^ a b c d e f g h i j k "WorldView-4" (PDF). DigitalGlobe. November 2015. Retrieved 19 March 2016.
  4. ^ a b "#WV4 update: #AtlasV WorldView-4 launch now scheduled for Nov. 11. Launch window is 10:30-10:46amPST. @DigitalGlobe". United Launch Alliance. 3 November 2016. Retrieved 3 November 2016.
  5. ^ a b c d "Launch Schedule". Spaceflight Now. 18 September 2016. Archived from the original on 18 September 2016. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; 19 September 2016 suggested (help)
  6. ^ a b c d "GeoEye-2 (WorldView-4) Satellite Sensor (0.34m)". Satellite Imaging Corporation. Retrieved 19 March 2016.
  7. ^ a b "Primary Mirror Blank Assembly for GeoEye-2". GIM International. 11 June 2008. Retrieved 19 March 2016.
  8. ^ "U.S. Department of Commerce Relaxes Resolution Restrictions, DigitalGlobe Extends Lead in Image Quality" (Press release). DigitalGlobe. 11 June 2014. Retrieved 19 March 2016.
  9. ^ "GeoEye Initiates Development of its Third Generation Earth-Imaging Satellite" (Press release). GeoEye via PRNewswire. 18 October 2007. Retrieved 2 April 2016. {{cite press release}}: Italic or bold markup not allowed in: |publisher= (help)
  10. ^ a b "ITT awarded contract to build the Imaging System for the GeoEye-2 Earth-Imaging Satellite" (PDF) (Press release). ITT Corporation. 31 August 2010. Retrieved 2 April 2016.
  11. ^ Ferster, Warren (11 March 2010). "Lockheed Martin Selected To Build GeoEye-2 Imaging Satellite". Space News. Retrieved 2 April 2016.
  12. ^ Censer, Marjorie (3 May 2010). "GeoEye building satellite, awaits decision on major contract award". The Washington Post. Retrieved 2 April 2016.
  13. ^ "GeoEye-2 completes design review". Dalje.com. United Press International. 1 July 2011. Retrieved 2 April 2016.
  14. ^ "GeoEye-2's Design Phase Finishes Ahead of Schedule". Space News. 5 July 2011. Retrieved 2 April 2016.
  15. ^ "GeoEye-2 Camera Passes Critical Design Review". Space News. 7 March 2011. Retrieved 2 April 2016.
  16. ^ a b Lockwood, Irene (10 April 2012). "ITT Exelis delivers imaging system for next-generation, high-resolution GeoEye-2 satellite" (Press release). ITT Exelis. Retrieved 2 April 2016.
  17. ^ Bergin, Chris (2 May 2012). "Lockheed Martin complete milestones on two upcoming spacecraft". NASA Spaceflight. Retrieved 2 April 2016.
  18. ^ Tomesco, Frederic; Callan, James (23 July 2012). "DigitalGlobe Agrees to Acquire GeoEye for About $900 Million". Bloomberg. Retrieved 19 March 2016.
  19. ^ Harden, Mark; Avery, Greg (31 January 2013). "DigitalGlobe completes GeoEye buy". Denver Business Journal. Retrieved 19 March 2016.
  20. ^ Ray, Justin (4 February 2013). "One commercial Earth-imager deferred in favor of another". Spaceflight Now. Retrieved 19 March 2016.
  21. ^ "DigitalGlobe Announces Second 30-Centimeter Satellite to Launch in Mid-2016" (Press release). DigitalGlobe. 31 July 2014. Retrieved 2 April 2016.
  22. ^ Painter, Kristen Leigh (31 July 2014). "Demand moves DigitalGlobe to speed launch of high-powered satellite". The Denver Post. Retrieved 2 April 2016.
  23. ^ Smith, Marcia S. (23 June 2012). "EnhancedView News Not so Rosy for GeoEye". Space Policy Online. Retrieved 28 June 2016.
  24. ^ a b "Launch of Atlas V Rocket with Worldview-4 Satellite Postponed Until October". Sputnik News. 22 September 2016. Retrieved 22 September 2016.
  25. ^ Clark, Stephen (5 March 2016). "Fate of NASA's InSight Mars mission to be decided soon". Spaceflight Now. Retrieved 6 July 2016.
  26. ^ Graham, William (18 September 2016). "Atlas V delays WorldView-4 launch from Vandenberg". NASA Spaceflight. Retrieved 18 September 2016.
  27. ^ Hamm, Keith (29 September 2016). "Vandenberg Beats Back Four Separate Fires". Santa Barbara Independent. Retrieved 29 September 2016.
  28. ^ a b Richardson, Derek (18 September 2016). "Nearby wildfire prompts delay in Atlas V launch". Spaceflight Insider. Retrieved 18 September 2016.
  29. ^ Scully, Janene (27 September 2016). "Vandenberg AFB Beefs Up Security In Wake of Fires; Damage Still Unknown". Noozhawk. Retrieved 29 September 2016.
  30. ^ Jacobson, Willis (28 September 2016). "VAFB commander addresses fires at town hall forum". Santa Maria Times. Retrieved 29 September 2016.
  31. ^ "Satellite: WorldView-4". World Meteorological Organization. 17 February 2016. Retrieved 19 March 2016.

Retrieved from "https://en.wikipedia.org/w/index.php?title=WorldView-4&oldid=747682465"