Astrogeology Science Center

Sol 1576: Arm fault

10 January 2017

MSL planning started 2 hours later than usual today because the Sol 1575 data needed for planning weren't expected until almost 10 AM PST.  Unfortunately, the news was not good:  An arm fault prevented the MAHLI full suite from completing, leaving the camera close to the surface with its dust cover open.  The remote science and drive that were planned to follow were also precluded.  Fortunately, this fault has occurred before and is well understood, but recovering from the anomaly made for a rather hectic day for me as SOWG Chair!  The first order of business was to get MAHLI into a safe configuration, so the Sol 1576 plan starts with a single MAHLI image to look for evidence of dust on the exposed optics.  Front Hazcam images will be taken before and after MAHLI is retracted from the surface, then Right Mastcam will take a picture of MAHLI's optics, again to look for dust contamination.  Finally, the MAHLI dust cover will be closed and APXS placed on Dorr Mountain for a short integration.  The arm will then be stowed and Right Mastcam will acquire a 5x1 mosaic of a distant mesa named "Lobster Mountain."  ChemCam and Right Mastcam will observe Dorr Mountain and a bedrock target dubbed "Parkman Mountain," and Left Mastcam will take another image of the rover deck to monitor changes in the dust and sand on the deck.  Mastcam will also measure the amount of dust in the atmosphere before the drive is attempted again.  We don't expect as much data as usual in time for planning the next Sol, so we had to carefully prioritize the post-drive imaging, which includes another Navcam stereo pair of the arm workspace.  Later in the Sol, ChemCam will autonomously observe a target selected by the AEGIS software.  Finally, the rover will recharge overnight to get ready for more fun on Sol 1577.

by Ken Herkenhoff

Dates of planned rover activities described in these reports are subject to change due to a variety of factors related to the Martian environment, communication relays and rover status.