As Comet ISON sweeps past Mars today, most observations will happen EarthSky

Despite the U.S. government shutdown today, it appears that many planned observations of Comet ISON – as it sweeps dramatically close to the planet Mars today – will happen. NASA has a skeleton crew in support of the six crew members aboard International Space Station (ISS) in place, so presumably they will observe Comet ISON today, as previously announced. Likewise, the Mars Reconnaissance Orbiter’s HiRISE instrument will be turned in Comet ISON’s direction today, according to Anjani Polit, the HiRISE Uplink Lead.