This spring, NASA will be paying cautious attention to a comet that could put on a barnstorming show at Mars on Oct. 19, 2014.
On that date, comet C/2013 A1 Siding Spring will buzz Mars about 10
times closer than any identified comet has ever flown past Earth.
Spacecraft at Mars might get a good look at the nucleus of comet
Siding Spring as it heads toward the closest approach, roughly 86,000
miles (138,000 kilometers) from the planet, give or take a few percent.
On the other hand, dust particles that the comet nucleus sheds this
spring could threaten orbiting spacecraft at Mars in October.
The level of risk won’t be known for months, but NASA is already
evaluating possible precautionary measures as it prepares for studying
the comet.
"Our plans for using spacecraft at Mars to observe comet Siding
Spring will be coordinated with plans for how the orbiters will duck and
cover, if we need to do that," said Rich Zurek, Mars Exploration
Program chief scientist at NASA's Jet Propulsion Laboratory, Pasadena,
Calif.
Comet Siding Spring, formally named C/2013 A1, was discovered on Jan.
3, 2013, from Australia's Siding Spring Observatory. At the time, it
was farther from the sun than Jupiter is. Subsequent observations
enabled scientists at JPL and elsewhere to calculate the trajectory the
comet will follow as it swings past Mars. Observations in 2014 will
continue to refine knowledge of the comet's path, but in approximate
terms, Siding Spring's nucleus will come about as close to Mars as
one-third of the distance between Earth and the moon.
Comet Ready for Its Close-up
Observations of comet Siding Spring are planned using resources on
Earth, orbiting Earth, on Mars and orbiting Mars, and some are already
underway. NASA's Hubble Space Telescope and the NEOWISE mission have
observed the comet this month both to characterize this first-time
visitor from the Oort cloud and to study dust particle sizes and amounts
produced by the comet for understanding potential risks to the Mars
orbiters. Infrared imaging by NEOWISE reveals a comet that is active and
dusty, even though still nearly three-fourths as far from the sun as
Jupiter is. Ground-based observatories such as the NASA Infrared
Telescope Facility are also expected to join in as the comet becomes
favorably positioned for viewing.
As the comet nears Mars, NASA assets there will be used to study this visitor from distant reaches of the solar system.
"We could learn about the nucleus -- its shape, its rotation, whether
some areas on its surface are darker than others," Zurek said.
Researchers using spacecraft at Mars gained experience at trying to
observe a different comet in 2013, as comet ISON (formally C/2012 S1)
approached Mars. That comet's Mars-flyby distance was about 80 times
farther than Siding Spring's will be. Another difference is that ISON
continued inward past Mars for nearly two months, briefly becoming
visible to some unaided-eye skywatchers on Earth before flying very
close to the sun and disintegrating. Siding Spring will reach its
closest approach to the sun just six days after its Mars flyby. It won't
put on a show for Earth, and it won't return to the inner solar system
for about a million years.
At comet Siding Spring's flyby distance, the High Resolution Imaging
Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter
could provide imagery with resolution of dozens of pixels across the
diameter of the nucleus. When HiRISE observed comet ISON, the nucleus
was less than one pixel across. ISON did not get bright enough to make
itself visible to other cameras at Mars that made attempted
observations, but Siding Spring could provide a better observation
opportunity.
Cameras on the Mars rovers Curiosity and Opportunity might watch for
meteors in the sky that would be an indication of the abundance of
particles in the comet's tail, though the geometry of the flyby would
put most of the meteors in daytime sky instead of dark sky.
"A third aspect for investigation could be what effect the infalling
particles have on the upper atmosphere of Mars," Zurek said. "They might
heat it and expand it, not unlike the effect of a global dust storm."
Infrared-sensing instruments on Mars Reconnaissance Orbiter and Odyssey
might be used to watch for that effect.
Assessing Possible Hazards to Mars Orbiters
One trait Siding Spring shares with ISON is unpredictability about
how much it will brighten in the months before passing Mars. The degree
to which Siding Spring brightens this spring will be an indicator of how
much hazard it will present to spacecraft at Mars.
"It's way too early for us to know how much of a threat Siding Spring
will be to our orbiters," JPL's Soren Madsen, Mars Exploration Program
chief engineer, said last week. "It could go either way. It could be a
huge deal or it could be nothing -- or anything in between."
The path the nucleus will take is now known fairly well. The
important unknowns are how much dust will come off the nucleus, when it
will come off, and the geometry of the resulting coma and tail of the
comet.
During April and May, the comet will cross the range of distances
from the sun at which water ice on a comet's surface typically becomes
active -- vaporizing and letting dust particles loose. Dust ejected then
could get far enough from the nucleus by October to swarm around Mars.
"How active will Siding Spring be in April and May? We'll be watching
that," Madsen said. "But if the red alarm starts sounding in May, it
would be too late to start planning how to respond. That's why we're
doing what we're doing right now."
Two key strategies to lessen risk are to get orbiters behind Mars
during the minutes of highest risk and to orient orbiters so that the
most vulnerable parts are not in the line of fire.
The Martian atmosphere, thin as it is, is dense enough to prevent
dust from the comet from becoming a hazard to NASA's two Mars rovers
active on the surface. Three orbiters are currently active at Mars:
NASA's Mars Reconnaissance Orbiter (MRO) and Mars Odyssey, and the
European Space Agency's Mars Express. Two more departed Earth in late
2013 and are due to enter orbit around Mars about three weeks before the
comet Siding Spring flyby: NASA's Mars Atmosphere and Volatile
Evolution (MAVEN) and India's Mars Orbiter Mission.
Orbiters are designed with the risk of space-dust collisions in mind.
Most such collisions do not damage a mission. Design factors such as
blanketing and protected placement of vulnerable components help. Over a
five-year span for a Mars orbiter, NASA figures on a few percent chance
of significant damage to a spacecraft from the background level of
impacts from such particles, called meteoroids. Whether the Siding
Spring level will pack that much hazard -- or perhaps greater than 10
times more -- into a few hours will depend on how active it becomes.
This comet is orbiting the sun in almost the opposite direction as
Mars and the other planets. The nucleus and the dust particles it sheds
will be travelling at about 35 miles (56 kilometers) per second,
relative to the Mars orbiters. That's about 50 times faster than a
bullet from a high-powered rifle and double or triple the velocity of
background meteoroid impacts.
Cautionary Preparations
If managers choose to position orbiters behind Mars during the peak
risk, the further in advance any orbit-adjustment maneuvers can be made,
the less fuel will be consumed. Advance work is also crucial for the
other main option: reorienting a spacecraft to keep its least-vulnerable
side facing the oncoming stream of comet particles. The safest
orientation in terms of comet dust may be a poor one for maintaining
power or communications.
"These changes would require a huge amount of testing," Madsen said.
"There's a lot of preparation we need to do now, to prepare ourselves in
case we learn in May that the flyby will be hazardous."
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