ShadowCam Instrument and Investigation Overview

Robinson, Mark Southwick; Brylow, Scott Michael; Caplinger, Michael Alan; Carter, Lynn Marie; Clark, Mattew John; Denevi, Brett Wilcox; Estes, Nicholas Michael; Humm, David Carl; Mahanti, Prasun; Peckham, Douglas Arden; Ravine, Michael Andrew; Schaffner, Jacob Andrieu; Speyerer, Emerson Jacob; Wagner, Robert Vernon

doi:10.5140/jass.2023.40.4.149

Cited by 8 publications

(2 citation statements)

References 102 publications

(138 reference statements)

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“…It accommodates six payloads in total. The payloads include lunar terrain imager (LUTI) (Heo et al 2016), wide-angle polarimetric camera (PolCam) (Jeong et al 2017), KPLO gamma-ray spectrometer (KGRS) (Kim et al 2016), KPLO magnetometer (KMAG) (Jin et al 2017;Jo et al 2023), disruption tolerant network experiment payload (DTNPL) (Jo et al 2016;Lee et al 2022), and ShadowCam (Robinson et al 2017(Robinson et al , 2023Mahanti et al 2023). The Ground Segment, or KPLO deepspace ground system consists of Korea deep-space antenna , real-time operation subsystem , mission planning subsystem (Kim et al 2017), flight dynamics subsystem (FDS; Song et al 2021), image calibration & analysis subsystem (Yim et al 2023), science data management subsystem (Kim 2019).…”

Section: System Operation Designmentioning

confidence: 99%

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Jeon,

Cho,

Kim

et al. 2024

J. Astron. Space Sci.

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Korea Pathfinder Lunar Orbiter (KPLO) is South Korea’s first space exploration mission, developed by the Korea Aerospace Research Institute. It aims to develop technologies for lunar exploration, explore lunar science, and test new technologies. KPLO was launched on August 5, 2022, by a Falcon-9 launch vehicle from cape canaveral space force station (CCSFS) in the United States and placed on a ballistic lunar transfer (BLT) trajectory. A total of four trajectory correction maneuvers were performed during the approximately 4.5-month trans-lunar cruise phase to reach the Moon. Starting with the first lunar orbit insertion (LOI) maneuver on December 16, the spacecraft performed a total of three maneuvers before arriving at the lunar mission orbit, at an altitude of 100 kilometers, on December 27, 2022. After entering lunar orbit, the commissioning phase validated the operation of the mission mode, in which the payload is oriented toward the center of the Moon. After completing about one month of commissioning, normal mission operations began, and each payload successfully performed its planned mission. All of the spacecraft operations that KPLO performs from launch to normal operations were designed through the system operations design process. This includes operations that are automatically initiated post-separation from the launch vehicle, as well as those in lunar transfer orbit and lunar mission orbit. Key operational procedures such as the spacecraft’s initial checkout, trajectory correction maneuvers, LOI, and commissioning were developed during the early operation preparation phase. These procedures were executed effectively during both the early and normal operation phases. The successful execution of these operations confirms the robust verification of the system operation.

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Section: System Operation Designmentioning

confidence: 99%

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Jeon,

Cho,

Kim

et al. 2024

J. Astron. Space Sci.

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“…1 is a cutaway showing many of the key components of the ShadowCam instrument. Additional drawings and more detailed descriptions are in the ShadowCam instrument paper (Robinson et al 2023). ShadowCam was designed and built by Malin Space Science Systems (MSSS).…”

Section: Designmentioning

confidence: 99%

Calibration of ShadowCam

Humm,

Kinczyk,

Brylow

et al. 2023

J. Astron. Space Sci.

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ShadowCam is a high-sensitivity, high-resolution imager provided by NASA for the Danuri (KPLO) lunar mission. ShadowCam calibration shows that it is well suited for its purpose, to image permanently shadowed regions (PSRs) that occur near the lunar poles. It is 205 times as sensitive as the Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC). The signal to noise ratio (SNR) is greater than 100 over a large part of the dynamic range, and the top of the dynamic range is high enough to accommodate most brighter PSR pixels. The optical performance is good enough to take full advantage of the 1.7 meter/pixel image scale, and calibrated images have uniform response. We describe some instrument artifacts that are amenable to future corrections, making it possible to improve performance further. Stray light control is very challenging for this mission. In many cases, ShadowCam can image shadowed areas with directly illuminated terrain in or near the field of view (FOV). We include thorough qualitative descriptions of circumstances under which lunar brightness levels far higher than the top of the dynamic range cause detector or stray light artifacts and the size and extent of the artifact signal under those circumstances.

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Photogeological analysis of ShadowCam images of the permanently shadowed floor of lunar crater Shoemaker

Basilevsky,

Krasilnikov,

2024

Planetary and Space Science

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ShadowCam Instrument and Investigation Overview

Cited by 8 publications

References 102 publications

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Calibration of ShadowCam

Photogeological analysis of ShadowCam images of the permanently shadowed floor of lunar crater Shoemaker

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