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Enceladus' Damascus Sulci

Dr Carly Howett

Associate Professor of Space Instrumentation

Research theme

  • Exoplanets and planetary physics

Sub department

  • Atmospheric, Oceanic and Planetary Physics

Research groups

  • Planetary surfaces
  • Solar system
  • Space instrumentation
carly.howett@physics.ox.ac.uk
Atmospheric Physics Clarendon Laboratory
  • About
  • Publications

Inflight radiometric calibration of New Horizons’ Multispectral Visible Imaging Camera (MVIC)

Icarus Elsevier BV 287 (2017) 140-151

Authors:

Cja Howett, Ah Parker, Cb Olkin, Dc Reuter, K Ennico, Wm Grundy, Al Graps, Kp Harrison, Hb Throop, Mw Buie, Jr Lovering, Sb Porter, Ha Weaver, La Young, Sa Stern, Ra Beyer, Rp Binzel, Bj Buratti, Af Cheng, Jc Cook, Dp Cruikshank, Cm Dalle Ore, Am Earle, De Jennings, Ir Linscott, Aw Lunsford, Jwm Parker, S Phillippe, S Protopapa, E Quirico, Pm Schenk, B Schmitt, Kn Singer, Jr Spencer, Ja Stansberry, Ccc Tsang, Ge Weigle, Aj Verbiscer

Abstract:

© 2016 Elsevier Inc. We discuss two semi-independent calibration techniques used to determine the inflight radiometric calibration for the New Horizons’ Multi-spectral Visible Imaging Camera (MVIC). The first calibration technique compares the measured number of counts (DN) observed from a number of well calibrated stars to those predicted using the component-level calibration. The ratio of these values provides a multiplicative factor that allows a conversation between the preflight calibration to the more accurate inflight one, for each detector. The second calibration technique is a channel-wise relative radiometric calibration for MVIC's blue, near-infrared and methane color channels using Hubble and New Horizons observations of Charon and scaling from the red channel stellar calibration. Both calibration techniques produce very similar results (better than 7% agreement), providing strong validation for the techniques used. Since the stellar calibration described here can be performed without a color target in the field of view and covers all of MVIC's detectors, this calibration was used to provide the radiometric keyword values delivered by the New Horizons project to the Planetary Data System (PDS). These keyword values allow each observation to be converted from counts to physical units; a description of how these keyword values were generated is included. Finally, mitigation techniques adopted for the gain drift observed in the near-infrared detector and one of the panchromatic framing cameras are also discussed.
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Physical state and distribution of materials at the surface of Pluto from New Horizons LEISA imaging spectrometer

Icarus Elsevier 287 (2017) 229-260

Authors:

B Schmitt, S Philippe, WM Grundy, DC Reuter, R Côte, E Quirico, S Protopapa, LA Young, RP Binzel, JC Cook, DP Cruikshank, CM Dalle Ore, AM Earle, K Ennico, CJA Howett, DE Jennings, IR Linscott, AW Lunsford, CB Olkin, AH Parker, Parker, KN Singer, JR Spencer, JA Stansberry, SA Stern, CCC Tsang, AJ Verbiscer, HA Weaver, the New Horizons Science Team
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Pluto’s global surface composition through pixel-by-pixel Hapke modeling of New Horizons Ralph/LEISA data

Icarus Elsevier 287 (2017) 218-228

Authors:

S Protopapa, WM Grundy, DC Reuter, DP Hamilton, CM Dalle Ore, JC Cook, DP Cruikshank, B Schmitt, S Philippe, E Quirico, RP Binzel, AM Earle, K Ennico, CJA Howett, AW Lunsford, CB Olkin, A Parker, KN Singer, A Stern, AJ Verbiscer, HA Weaver, LA Young, the New Horizons Science Team
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The near-surface electron radiation environment of Saturn's moon Mimas

Icarus Elsevier 286 (2017) 56-68

Authors:

TA Nordheim, KP Hand, C Paranicas, CJA Howett, AR Hendrix, GH Jones, AJ Coates
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Thermally anomalous features in the subsurface of Enceladus’s south polar terrain

Nature Astronomy Springer Nature 1:4 (2017) 0063

Authors:

A Le Gall, C Leyrat, MA Janssen, G Choblet, G Tobie, O Bourgeois, A Lucas, C Sotin, C Howett, R Kirk, RD Lorenz, RD West, A Stolzenbach, M Massé, AH Hayes, L Bonnefoy, G Veyssière, F Paganelli
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