Pluto Encounter Data Review
Explore detailed documentation and calibration data from the New Horizons spacecraft's encounter with Pluto, including insights on dust counter readings before, during, and after the encounter. Analysis of raw data using NASAView reveals timestamp issues and channel hits distribution. Discover more about the spacecraft's position alignment and data discrepancies during the encounter.
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Presentation Transcript
PDS Data Review New Horizons Pluto Encounter Student Dust Counter May 19, 2016 Jim Gaier NASA Glenn Research Center
Documentation Documentation No issues with the documentation except: NHSC.cat Spacecraft sketches do not show position of SDC nor is its position described in the document SOC to Instrument Pipeline ICD P115, 13.2.1, 2) the unused channel should be 10 not 11 (which on higher level data products becomes 11) P121, 13.4.4, 1) Calibrated Data - Only 9 columns are defined but there are 10 columns. j. Impact Velocity should be added
Calibration Data Calibration Data ( (last calibrated last calibrated 5 5- -13 13- -2013?) 2013?) Downloaded calibration matrices through Browse Plotted DNavg, SIG DNavg data look reasonable Temperature effects more pronounced at high counts 0 counts = 65535 and decreases with increased signal strength Threshold (#7) set at 20,225 (45,310 or first 30 data points on charts) SIG data look reasonable Relative deviation ( /DNavg) ranges 1% 12% Higher counts, higher relative deviation Temp effects on relative deviation pronounced at high counts Range 4% to 12% SIG Channel 7 DNavg Channel 7 SIG/DNavg Channel 7 0.14 70000 1500 0.12 60000 50000 0.10 1000 40000 0.08 30000 0.06 500 20000 0.04 10000 0.02 0 0 0.00 0 20 40 60 80 0 20 40 60 80 0 20 40 60 80
Raw Data Raw Data Only used NASAView through Browse Looked at data around Pluto encounter (PE) Time Stamp issue? Identical times often the same for same channel (2,3) (5,6) (7,8) (11,12) (13,14) .3917 (way before PE) (2,3) (5,6) (8,9) (10,11) (12,13) (14,15) for .8021 (before PE) (2,3) (7,8) (11,12) (14,15) .8022 (during PE) (1,2) (3,4,5) (6,7) (8,9,10) (11,12) (13,14,15) .8033 (after PE) No clear hits (DNavg >> Threshold) Before PE: 1 with magnitude 2% above threshold During PE: 4 with magnitude (0.03 0.6% above threshold) After PE: none above threshold SDC not aligned in ram direction during Pluto Encounter Hits not evenly distributed among active channels "Hits" per Channel 20 10 0 0 1 2 3 4 5 7 8 9 11 12
Calibrated Data Calibrated Data Only used NASAView through Browse Looked at data around Pluto encounter (PE) Time Stamp duplications were propagated No recorded hits Mass = 0 for all DNavg (before, during, and after PE) One mass > 0 datum at lowest possible in (way before PE) data SDC "hits in July 2015 14 12 10 8 6 4 2 0 7/1/2015 7/2/2015 7/3/2015 7/4/2015 7/5/2015 7/6/2015 7/7/2015 7/8/2015 7/9/2015 7/10/2015 7/11/2015 7/12/2015 7/13/2015 7/14/2015 7/15/2015 7/16/2015 7/17/2015 7/18/2015 7/19/2015 7/20/2015 7/21/2015 7/22/2015 7/23/2015 7/24/2015 7/25/2015 7/26/2015 7/27/2015 7/28/2015 7/29/2015 7/30/2015 7/31/2015
