Locating the LCROSS Impact Craters
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The Lunar CRater Observations and Sensing Satellite (LCROSS) mission impacted a spent Centaur rocket stage into a permanently shadowed region near the lunar south pole. The Sheperding Spacecraft (SSC) separated ∼9 hours before impact and performed a small braking maneuver in order to observe the Centaur impact plume, looking for evidence of water and other volatiles, before impacting itself.
This paper describes the registration of imagery of the LCROSS impact region from the mid- and near-infrared cameras onboard the SSC, as well as from the Goldstone radar. We compare the Centaur impact features, positively identified in the first two, and with a consistent feature in the third, which are interpreted as a 20 m diameter crater surrounded by a 160 m diameter ejecta region. The images are registered to Lunar Reconnaisance Orbiter (LRO) topographical data which allows determination of the impact location. This location is compared with the impact location derived from ground-based tracking and propagation of the spacecraft’s trajectory and with locations derived from two hybrid imagery/trajectory methods. The four methods give a weighted average Centaur impact location of −84.6796°, −48.7093°, with a 1σ uncertainty of 115 m along latitude, and 44 m along longitude, just 146 m from the target impact site. Meanwhile, the trajectory-derived SSC impact location is −84.719°, −49.61°, with a 1σ uncertainty of 3 m along the Earth vector and 75 m orthogonal to that, 766 m from the target location and 2.803 km south-west of the Centaur impact.
We also detail the Centaur impact angle and SSC instrument pointing errors. Six high-level LCROSS mission requirements are shown to be met by wide margins. We hope that these results facilitate further analyses of the LCROSS experiment data and follow-up observations of the impact region.
KeywordsAstrodynamics Lunar Image Registration LCROSS
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- D. Andrews, LCROSS Lunar Impactor – Lessons Learned from a Small Satellite Mission, 61st International Astronautical Congress, Prague, CZ, IAC-10-B4.8.2 (2010) Google Scholar
- I. Arganda-Carreras, C.O.S. Sorzano, R. Marabini, J.M. Carazo, C.O. de Solorzano, J. Kybic, Consistent and Elastic Registration of Histological Sections Using Vector-Spline Regularization, in CVAMIA: Computer Vision Approaches to Medical Image Analysis. Lecture Notes in Computer Science, vol. 4241 (Springer, Berlin, 2006), p. 85 CrossRefGoogle Scholar
- M. Broxton, A.V. Nefian, Z. Moratto, T. Kim, M. Lundy, A.V. Segal, 3D lunar terrain reconstruction from Apollo images, in Proceedings of the 5th International Symposium on Advances in Visual Computing: Part I. (2009), p. 710 Google Scholar
- A. Colaprete, P. Schultz, J. Heldmann, D. Wooden, M. Shirley, K. Ennico, B. Hermalyn, W. Marshall, A. Ricco, R.C. Elphic, D. Goldstein, D. Summy, G.W. Bart, E. Asphaug, D. Korycansky, D. Landis, L. Sollitt, Detection of water in the LCROSS ejecta plume. Science 330(6003), 463 (2010) ADSCrossRefGoogle Scholar
- D.S. Cooley et al., Mission design for the Lunar CRater Observation and Sensing Satellite (LCROSS), AIAA 2010-8386, 2010 AIAA/AAS Astrodynamics Specialist Conference, Toronto, Canada, 2–5 August 2010 Google Scholar
- K. Ennico et al., LCROSS science payload ground development, test and calibration results, in 39th Lunar and Planetary Science Conference. Lunar and Planetary Science Institute, League City, No 1391 (2008), p. 1474 Google Scholar
- K. Ennico, A. Colaprete, M. Shirley, D. Wooden, Lunar Crater Observation and Sensing Satellite (LCROSS) instrument calibration summary (2010) Google Scholar
- K. Ennico, M. Shirley, A. Colaprete, L. Osetinsky, The Lunar Crater Observation and Sensing Satellite (LCROSS) payload development and performance in flight, Space Sci. Rev. (2011, this issue) Google Scholar
- J. Heldmann, W. Marshall, A. Colaprete, D. Goldstein, D. Summy, Evolution of the dust and water ice plume components as observed by the LCROSS Visible Camera and UV-Visible Spectrometer (2010, in preparation) Google Scholar
- LCROSS Flight Director’s Blog, http://blogs.nasa.gov/cm/newui/blog/viewpostlist.jsp?blogname=lcrossfdblog (2009)
- Z. Moratto et al., LCROSS derived map products, in 3rd Annual Lunar Science Forum, NASA-Ames, USA, Poster 220 (2010) Google Scholar
- J. Strong et al., Transport and use of a Centaur second stage in space, in AIAA Space Ops 2010 Conference, Delivering on the Dream (AIAA, Washington, DC, 2010). Paper 2010-2197 Google Scholar
- P. Tompkins et al., Flight operations for the LCROSS lunar impactor mission, in AIAA Space Ops 2010 Conference, Delivering on the Dream (AIAA, Washington, DC, 2010a). Paper 2010-1986 Google Scholar
- P. Tompkins et al., Flight team development in support of LCROSS: a class D mission, in AIAA Space Ops 2010 Conference, Delivering on the Dream (AIAA, Washington, DC, 2010b). Paper 2010-2223 Google Scholar