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Kepler
Space Telescope
OperatorLASP NASA
COSPAR ID2009-011A
SATCAT no.34380
Websitekepler.nasa.gov
Mission durationplanned: 3.5 years
elapsed: 15 years, 3 months and 12 days
Spacecraft properties
Manufacturer
Ball Aerospace & Technologies Corp.
Launch mass1,052.4 kg (2,320 lb)[1]
Dry mass1,040.7 kg (2,294 lb)
Payload mass478 kg (1,054 lb)
Dimensions4.7 m × 2.7 m (15.4 ft × 8.9 ft)
Power1100 watts
Start of mission
Launch dateMarch 7, 2009, 03:49:57 (2009-03-07UTC03:49:57Z) UTC
Cape Canaveral Air Force Station
ContractorUnited Launch Alliance
Entered serviceMay 12, 2009, 09:01 (2009-05-12UTC09:01Z) UTC
Orbital parameters
Reference systemHeliocentric
RegimeEarth-trailing
Period372.5 days
Main Telescope
TypeSchmidt camera
Diameter0.95 m (3.1 ft)
Collecting area0.708 m2[A]
Wavelengths400–865 nm[3]
Transponders
BandX band (TT&C)
Ka band (data acquisition)
Bandwidthfew kbit/s (X Band)
~4.3 Mbit/s (Ka band)
 

Kepler is a

space observatory launched by NASA to discover Earth-like planets orbiting other stars.[5] The spacecraft, named after the Renaissance astronomer Johannes Kepler,[6] was launched on March 7, 2009.[7]

Designed to survey a portion of our region of the

analyzed to detect periodic dimming caused by extrasolar planets that cross in front
of their host star.

Kepler is part of NASA's

Ball Aerospace responsible for developing the Kepler flight system. The Ames Research Center is responsible for the ground system development, mission operations since December 2009, and science data analysis. The initial planned lifetime was 3.5 years,[11] but greater-than-expected noise in the data, from both the stars and the spacecraft, meant additional time was needed to fulfill all mission goals. Initially, in 2012, the mission was expected to last until 2016,[12] but this would only have been possible if all remaining reaction wheels used for pointing the spacecraft remained reliable.[13] On May 11, 2013, a second of four reaction wheels failed, disabling the collection of science data[14] and threatening the continuation of the mission.[15]

As of June 2014[update], Kepler and its follow-up observations had found

Milky Way Galaxy.[18][19][20] 11 billion of these estimated planets may be orbiting sun-like stars.[21] The nearest such planet may be 12 light-years away, according to the scientists.[18][19]

On August 15, 2013, NASA announced that they had given up trying to fix the two failed reaction wheels. This meant the current mission needed to be modified, but it did not necessarily mean the end of planet-hunting. NASA had asked the space science community to propose alternative mission plans "potentially including an exoplanet search, using the remaining two good reaction wheels and thrusters".

Spacecraft

Kepler being loaded onto its upper stage

The spacecraft has a mass of 1,039 kilograms (2,291 lb) and contains a 1.4-meter (55 in) primary mirror feeding an aperture of 0.95-meter (37.4 in) – at the time of its launch this was the largest mirror on any telescope outside Earth orbit.[31] The spacecraft has a 115 deg2 (about 12-degree diameter) field of view (FOV), roughly equivalent to the size of one's fist held at arm's length. Of this, 105 deg2 is of science quality, with less than 11% vignetting. The photometer has a soft focus to provide excellent photometry, rather than sharp images. The mission goal is a combined differential photometric precision (CDPP) of 20 ppm for a m(V)=12 solar-like star for a 6.5-hour integration, though the observations so far have fallen short of this objective (see mission status). An Earth-like transit produces a brightness change of 84 ppm and lasts for thirteen hours when it crosses the center of the star.

Camera

p-mode stars, smear, black level, background and full field-of-view images.[34][35]

Second Light (K2)

In November 2013, a newly proposed mission plan, initially named "K2" (also called "Second Light"), was presented for consideration.

exoplanets.[27][28][36] In this proposed mission plan, Kepler would search a much larger area in the plane of earth's orbit around the sun.[27][28][36]

Kepler's "Second Light" (K2) Proposal Explained (December 11, 2013).[28]

In early 2014, the spacecraft underwent successful testing for the K2 mission.[37] From March to May 2014, data from a new field called Field 0 was collected as a testing run.[38] On May 16, 2014, NASA announced the approval of extending the Kepler mission to the K2 mission.[30] Kepler's photometric precision for the K2 mission is estimated to be 50 ppm on a magnitude 12 star for a 6.5 hour integration.[39] In February 2014, photometric precision for the K2 mission using two-wheel, fine-point precision operations was measured as 44 ppm on magnitude 12 stars for a 6.5 hour integration. The analysis of these measurements posted by NASA stated that the measurements "suggest" the K2 photometric precision "approaches" that of the Kepler archive of three-wheel, fine-point precision data.[40]

Field 1 of the K2 mission is set towards the

Scorpius–Centaurus Association which is only about 11 million years old[42] and at a distance of 380-470 light years[43] with probably over 1000 members.[44]

Data releases

The Kepler team originally promised to release data within one year of observations.[45] However, this plan was changed after launch, with data being scheduled for release up to three years after its collection.[46] This resulted in considerable criticism,[47][48][49][50][51] leading the Kepler science team to release the third quarter of their data one year and nine months after collection.[52] The data through September 2010 (quarters 4, 5, and 6) was made public in January 2012.[53]

See also

  • Kepler-22b, the first exoplanet confirmed by Kepler to have an average orbital distance within its star's habitable zone
  • List of planetary systems
Related or comparable missions and projects

Notes

  1. ^ Aperture of 0.95 m yields a light-gathering area of Pi×(0.95/2)2 = 0.708 m2; the 42 CCDs each sized 0.050 m × 0.025m yields a total sensor area of 0.0525 m2:[4]
  2. ^ This does not include Kepler candidates without a KOI designation, such as circumbinary planets, or candidates found in the Planet Hunters project.

References

  1. ^ "Kepler: FAQ". NASA Ames Research Center. Retrieved March 25, 2014. 
  2. ^ This ref was orphaned. 
  3. ^ NASA Staff (2010). "Kepler Mission: Photometer and Spacecraft". NASA. Retrieved February 2, 2011. 
  4. ^ Staff (June 26, 2013). "Kepler Spacecraft and Instrument | NASA". nasa.gov. Archived from the original on January 18, 2014. Retrieved January 18, 2014. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; January 19, 2014 suggested (help) 
  5. ^ Koch, David; Gould, Alan (March 2009). "Kepler Mission". NASA. Retrieved March 14, 2009. 
  6. ^ DeVore, Edna (June 9, 2008). "Closing in on Extrasolar Earths". SPACE.com. Retrieved March 14, 2009. {{cite news}}: External link in |work= (help) 
  7. ^ NASA Staff. "Kepler Launch". NASA. Retrieved September 18, 2009. 
  8. ^ NASA Staff. "Kepler Mission/QuickGuide". NASA. Retrieved April 20, 2011. Supports:"survey a portion of our region", "near the habitable zone and estimate how"
  9. extrasolar planets in", "the Milky Way
    to discover"
  10. ^ AAS Staff. "Meeting Program and Block Schedule". American Astronomical Society. Retrieved April 20, 2011. – click the itinerary builder to get to the abstract of "Kepler Planet Detection Mission: Introduction and First Results". 
  11. ^ BBC Staff (March 7, 2009). "Nasa launches Earth hunter probe". BBC News. Retrieved March 14, 2009. 
  12. ^ "NASA Extends Planet-Hunting Kepler Mission Through 2016". Space.com. April 4, 2012. Retrieved May 2, 2012. 
  13. ^ Stephen Clark (October 16, 2012). "Kepler's exoplanet survey jeopardized by two issues". Spaceflight Now. Retrieved October 17, 2012. 
  14. ^ NASA - Kepler Mission Manager Update (May 21, 2013) 
  15. ^ "Equipment Failure May Cut Kepler Mission Short". The New York Times. May 15, 2013. Retrieved May 15, 2013. 
  16. ^ Wall, Mike (June 14, 2013). "Ailing NASA Telescope Spots 503 New Alien Planet Candidates". Space.com. TechMediaNetwork. Retrieved June 15, 2013.
  17. ^ "NASA's Exoplanet Archive KOI table". NASA. Retrieved February 28, 2014.
  18. ^
    New York Times
    . Retrieved November 5, 2013.
  19. ^
    PMID 24191033
    .
  20. ^ Staff (January 7, 2013). "17 Billion Earth-Size Alien Planets Inhabit Milky Way". Space.com. Retrieved January 8, 2013.
  21. ^ Khan, Amina (November 4, 2013). "Milky Way may host billions of Earth-size planets". Los Angeles Times. Retrieved November 5, 2013.
  22. ^ "NASA Ends Attempts to Fully Recover Kepler Spacecraft, Potential New Missions Considered". August 15, 2013. Retrieved August 15, 2013.
  23. New York Times
    . Retrieved August 15, 2013.
  24. ^ Wall, Mike (August 15, 2013). "Planet-Hunting Days of NASA's Kepler Spacecraft Likely Over". Space.com. Retrieved August 15, 2013.
  25. ^ "Kepler: NASA retires prolific telescope from planet-hunting duties".
  26. New York Times
    . Retrieved November 18, 2013.
  27. ^ a b c d Johnson, Michele (November 25, 2013). Johnson, Michele (ed.). "A Sunny Outlook for NASA Kepler's Second Light". nasa.gov. NASA Official: Brian Dunbar; Image credits: NASA Ames; NASA Ames/W Stenzel. NASA. Archived from the original on April 17, 2014. Retrieved December 12, 2013. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; April 18, 2014 suggested (help)
  28. ^ a b c d e Johnson, Michele (December 11, 2013). Johnson, Michele (ed.). "Kepler's Second Light: How K2 Will Work". nasa.gov. NASA Official: Brian Dunbar; Image credit: NASA Ames/W Stenzel. NASA. Archived from the original on April 17, 2014. Retrieved December 12, 2013. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; April 18, 2014 suggested (help) 
  29. ^ a b Hunter, Roger (December 11, 2013). Johnson, Michele (ed.). "Kepler Mission Manager Update: Invited to 2014 Senior Review". nasa.gov. NASA Official: Brian Dunbar. NASA. Archived from the original on April 17, 2014. Retrieved December 12, 2013. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; April 18, 2014 suggested (help)
  30. ^ a b Sobeck, Charlie (May 16, 2014). Johnson, Michele (ed.). "Kepler Mission Manager Update: K2 Has Been Approved!". nasa.gov. NASA Official: Brian Dunbar; Image credit(s): NASA Ames/W. Stenzel. NASA. Archived from the original on May 17, 2014. Retrieved May 17, 2014.
  31. ^ Atkins, William (December 28, 2008). "Exoplanet Search Begins with French Launch of Corot Telescope Satellite". iTWire. Retrieved May 6, 2009.
  32. ^ NASA Staff. "Kepler: Spacecraft and Instrument". NASA. Retrieved May 1, 2009.
  33. ^ NASA Staff (April 16, 2009). "Kepler's Diamond Mine of Stars". NASA. Retrieved May 1, 2009.
  34. ^ a b NASA Staff (February 2009). "Kepler: NASA's First Mission Capable of Finding Earth-Size Planets" (PDF). NASA. Retrieved March 14, 2009. {{cite journal}}: Cite journal requires |journal= (help)
  35. ^ "PyKE Primer - 2. Data Resources". NASA. Retrieved March 12, 2014.
  36. ^
    TechMediaNetwork. Archived from the original on April 17, 2014. Retrieved April 17, 2014. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; April 18, 2014 suggested (help
    )
  37. ^ Hunter, Roger (February 14, 2014). Johnson, Michele (ed.). "Kepler Mission Manager Update: K2 spacecraft operation tests continue". nasa.gov. NASA Official: Brian Dunbar; Image Credit: NASA Ames/T. Barclay. NASA. Archived from the original on April 17, 2014. Retrieved April 17, 2014. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; April 18, 2014 suggested (help)
  38. S2CID 119239193
    . Retrieved June 12, 2014.
  39. ^ Still, Martin, ed. (May 29, 2014). "Kepler Guest Observer Program". keplerscience.arc.nasa.gov. NASA Official: Jessie Dotson. Archived from the original on June 12, 2014. Retrieved June 12, 2014. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; June 13, 2014 suggested (help)
  40. ^ Still, Martin, ed. (May 29, 2014). "K2 Performance". keplerscience.arc.nasa.gov. NASA Official: Jessie Dotson. Archived from the original on June 12, 2014. Retrieved June 12, 2014. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; June 13, 2014 suggested (help)
  41. arXiv:1405.7690v1. Retrieved May 31, 2014. {{cite journal}}: External link in |journal= (help
    )
    Supports:"Field 1 of the K2 mission is set", "sky and Field 2 is towards the"
  42. S2CID 118461108.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  43. S2CID 16098861.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  44. S2CID 16855894.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  45. ^ "Frequently Asked Questions from the Public". Retrieved September 6, 2011. This Kepler FAQ states: "Data for each 3-month observation period will be made public within one year of the end the observation period".
  46. ^ "NASA's Kepler Mission Data Release Schedule". NASA. Retrieved October 18, 2011. On this schedule, the data from the quarter ending June 2010 was scheduled to be released in June 2013.
  47. ^ Dennis Overbye (June 14, 2010). "In the Hunt for Planets, Who Owns the Data?". New York Times.
  48. ^ Eric Hand (April 14, 2010). "Telescope team may be allowed to sit on exoplanet data". Nature.
  49. ^ Alan MacRobert (August 2011). "Kepler's Exoplanets: A Progress Report". S ky and Telescope.
  50. ^ Alex Brown (March 28–29, 2011). "Minutes of the Kepler Users Panel" (PDF).
  51. ^ Nicole Gugliucci (June 15, 2010). "KEPLER EXOPLANET CONTROVERSY ERUPTS". Discovery news.
  52. ^ "NASA's Kepler Mission Announces Next Data Release to Public Archive".
  53. ^ "Kepler Data Collection and Archive Timeline". Retrieved January 1, 2012.

Further reading

External links

Extrasolar planet
catalogs and databases