Large strategic science missions

NASA's large strategic science missions or large strategic missions, formerly known as Flagship missions or Flagship-class missions,[1][2] are the costliest and most capable NASA science spacecraft. Flagship missions exist within all four divisions of NASA's Science Mission Directorate: the astrophysics, Earth science, heliophysics and planetary science divisions.

The Hubble Space Telescope has made major contributions to many areas of space science. By the time it launched, Hubble cost about US$4.7 billion.

"Large" refers to the budget of each mission, typically the most expensive mission in the scientific discipline. Within the Astrophysics Division and the Planetary Science Division, the large strategic missions are usually in excess of $1 billion. Within Earth Science Division and Heliophysics Division, the large strategic missions are usually in excess of $500 million.[3][2] "Strategic" refers to their role advancing multiple strategic priorities set forth in plans such as the Decadal Surveys.[2] "Science" marks these missions as primarily scientific in nature, under the Science Mission Directorate (SMD), as opposed to, e.g., human exploration missions under the Human Exploration and Operations Mission Directorate (HEOMD). The lines can be blurred, as when the Lunar Reconnaissance Orbiter began as a directed mission from the HEOMD, and was later transferred to the SMD.

Flagship missions are not under the purview of any larger "Flagship Program", unlike, e.g., Discovery-class missions that are under the purview of the Discovery Program. Unlike these competed classes that tender proposals through a competitive selection process, the development of Flagship missions is directed to a specific institution — usually a NASA center or the Jet Propulsion Laboratory — by the Science Mission Directorate.[2][1] Flagship missions are developed ad-hoc, with no predetermined launch cadence or uniform budget size. Flagship missions are always Class A missions[4]: high priority, very low risk.[2]

History

The Voyager probes mark the transition between the original NASA unmanned mission programs, which were funded and organized as a series of related missions to specific targets such as the Mariner probes, Pioneer probes, Surveyor landers, Ranger probes, etc., and the modern NASA system which includes Flagships. In the early 1990s, NASA made the decision that instead of a centrally planned mission approach around pre-selected targets, mission ideas would compete for selection. The competitions would be based in cost categories, eventually turning into the Discovery and New Frontiers programs, as well as Flagship missions. While teams self-assemble to compete for Discovery and New Frontiers missions, Flagship missions are still strongly influenced by NASA headquarters. Also, Discovery and New Frontiers missions are scheduled frequently enough that a standard process has emerged and scientists can expect that process to be followed, but Flagship missions seem to follow a different organizational and development approach every time.

A joint mission concept between NASA and ESA was developed to send a probe to study the icy satellites of the outer Solar System. There were two primary candidate missions under study: Europa Jupiter System Mission (EJSM) and Titan Saturn System Mission (TSSM). On February 18, 2009 NASA announced that both missions could proceed forward, but the EJSM was to be the first, departing Earth in 2020 and arriving at Jupiter in 2026.[5]

The 2011 Planetary Science Decadal Survey report recommended to NASA that the highest priority Flagship mission for development was a sample-caching rover, called the Mars Astrobiology Explorer-Cacher (MAX-C), as an American contribution to the ExoMars project with the European Space Agency (ESA) and as precursor to a proposed Mars sample return mission. The second highest priority mission was identified as the Jupiter Europa Orbiter, proposed to be part of the NASA-ESA EJSM/Laplace mission, and would have studied Europa in detail as a site of astrobiological interest.[6] Other priorities included the Uranus orbiter and probe, the Enceladus Orbiter, and the Venus Climate Mission.[7]

Under the FY2013 budget that President Obama released on February 2012, NASA terminated its participation in ExoMars due to budgetary cuts,[8] in order to pay for the cost overruns of the James Webb Space Telescope.[9] At that time, all proposed NASA Flagship planetary missions were put on hold indefinitely.[10]

In December 2012, the Mars 2020 sample-caching rover, built on the same architecture as the Mars Science Laboratory (Curiosity rover), was announced on a proposed budget of $1.5 billion.[11] In June 2015, the Europa Clipper was approved by NASA and entered the formulation stage.[12]

In 2016, four different space telescopes were being proposed for selection in 2020: Large Ultraviolet Optical Infrared Surveyor (LUVOIR), Habitable Exoplanet Imaging Mission (HabEx), Origins Space Telescope (OST), and the Lynx X-ray Surveyor.[13] In 2019 the four teams will turn their final reports over to the National Academy of Sciences, whose independent Decadal Survey committee advises NASA on which space telescope mission should take top priority. Selection would take place in the 2020s, and launch approximately in 2035.[14]

Missions

The 2020s decade is expected to see two planetary launches, the Perseverance rover and the Europa Clipper, and a third, a Europa Lander has been studied for possible launch as early as 2024.[15]

NASA Large Strategic Science Missions[2]
Mission name Mission start Mission end
Planetary Science Division
Viking 1, 2[16]19751982
Voyager 1, 2[16]1977Operational
Galileo[16]19892003
Cassini[16]19992017
Mars Science Laboratory/Curiosity rover[17]2011Operational
Perseverance[17]2020In Transit
Europa Clipper[17]In development (2022-25 launch)
Europa Lander[18]Proposed (2024 launch)
Astrophysics Division
Compton Gamma-Ray Observatory[19]19912000
Hubble Space Telescope[19]1990Operational
Chandra X-ray Observatory[19][20]1999Operational
James Webb Space Telescope[21][22] In development

(2021 launch)
Nancy Grace Roman Space Telescope (formerly WFIRST)[23][24]In development (c.2026 launch)
Competing projects for the next Great Observatory: [14] Under study
Heliophysics Division
Solar Dynamics Observatory [25]2010Operational
Van Allen Probes [25]2012Operational
Magnetospheric Multiscale Mission (MMS)[26] 2015Operational
Parker Solar Probe[27] 2018Operational
Earth Science Division
Terra [28][29] 1999Operational
Aqua[28][29] 2002Operational
ICESat [30]20032010
Aura[29]2004Operational
Joint Polar Satellite System (JPSS) - a constellation[30]2011Operational
Plankton, Aerosol, Cloud, ocean Ecosystem (PACE)[31]In development

Of the four Great Observatories, only the Spitzer Space Telescope is not a Flagship mission. Despite an initial budget of US$2 billion, Spitzer was downscoped to a medium-size US$720 million mission.[2]

Mission targets

Planetary science Flagship missions will be crucial in allowing the exploration of high-priority targets. These critically important targets could help establish the limits of planetary habitability, not just for the Solar System, but for planetary systems in general. In particular, they potentially provide an opportunity to identify prebiotic organic molecules or even extant life beyond Earth, should it exist, in the Solar System. The targets of Flagship missions may include complex missions to the atmosphere and surface of Venus, the lower atmosphere and surface of Titan, the surface and subsurface of Europa, the stormy atmosphere of Jupiter, the dusty surface of Mars, the ring systems of Saturn, the deep atmospheres of the ice giants Neptune and Uranus, the surface of the moon Triton, the plumes of Enceladus, the surface and magnetosphere of Mercury, and the surface of a comet nucleus in the form of cryogenically preserved samples.[32]

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See also

References
  1. "NASA's 'Large Strategic' Science Missions Under the Microscope". www.aip.org. 2016-10-13. Retrieved 2019-06-28.
  2. National Academies of Sciences, Engineering, and Medicine (2017-08-24). Powering Science: NASA's Large Strategic Science Missions. The National Academies Press. doi:10.17226/24857. ISBN 9780309463836.CS1 maint: multiple names: authors list (link)
  3. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 10.
  4. "NASA Procedural Requirements: Risk Classification for NASA Payloads: Appendix B - Classification Considerations for NASA Class A-D Payloads".
  5. "News flash: Jupiter flagship mission selected to launch first". Archived from the original on 2012-02-20. Retrieved 2009-02-18.
  6. New approach for L-class mission candidates. ESA - 19 April 2011
  7. Visions and Voyages for Planetary Science 2013 - 2022 Archived 2009-04-13 at the Wayback Machine (Published on 19 October 2011)
  8. Aviation Week (February 14, 2012)
  9. Kremr, Ken (February 1, 2012). "Experts React to Obama Slash to NASA's Mars and Planetary Science Exploration". Universe Today. Retrieved 2012-02-18.
  10. "NASA shelves ambitious — and expensive — Flagship missions"
  11. Harwood, William (4 December 2012)."NASA announces plans for new $1.5 billion Mars rover" CNET. Retrieved 5 December 2012.
  12. Howell, Elizabeth (20 June 2015). "NASA's Europa Mission Approved for Next Development Stage" Space.com. Retrieved 2015-06-21.
  13. NASA Considers Its Next Flagship Space Telescope. Scoles. SciAm March 2016
  14. Scoles, Sarah (30 March 2016). "NASA Considers Its Next Flagship Space Telescope". Scientific American. Retrieved 2017-10-15.
  15. Here's what we know about the 12 proposals for NASA's next New Frontiers mission. Van Kane. Published by The Planetary Society. August 10, 2017.
  16. Solar System Programs: Outer Planets Flagship. NASA
  17. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 37.
  18. https://www.aip.org/fyi/2017/balance-nasa-planetary-science-missions-explored-hearing. American Institute of Physics. 21 July 2017.
  19. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 25.
  20. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 1.
  21. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 27.
  22. Flagship U.S. space telescope facing further delays. Daniel Clery, Science Magazine. 1 March 2018.
  23. Astronomers Will Fight to Save WFIRST Space Telescope from Being Axed. Calla Cofield, Space. 15 February 2018.
  24. Paul Hertz (2020-06-01). "NASA Town Hall" (PDF). Retrieved 2020-07-01.
  25. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 17.
  26. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 2.
  27. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 16.
  28. Terra: Earth Observing System Flagship. Space Today
  29. Earth Science: NASA's Mission to Our Home Planet. Edward S. Goldstein and Tabatha Thompson, NASA.
  30. NASA Missions: From Concept to Launch. (PDF.) Michael Amato, NASA. March 2013.
  31. Powering Science: NASA's Large Strategic Science Missions (2017). The National Academies Press. Page 14.
  32. Visions and Voyages for Planetary Science 2013 - 2022 Archived 2009-04-13 at the Wayback Machine (Published on 19 October 2011)

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