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Today, at the ISON-NM observatory, new astrometric measurements were received for this comet. Based on the existing measurements, more accurate orbital elements were calculated. The results of the second calculation for the close approach show that the comet might pass just 41,000 km (0.000276 a.u.) from the planet’s centre, that is less than 37,000 km from its surface!
Considering the size of the coma, which should exceed 100,000 km near the perihelion of its orbit, it can be said with 100% certainty that the planet will pass through the gaseous envelope of the comet C/2013 A1. Having a very tenuous atmosphere, the surface of the red planet will be subject to intensive bombardments by microparticles which, among other things, might cause malfunction of the space probes currently there.
Observations continue, and will be stopped only in late spring due to small elongation of the comet. In the second half of summer observations will be resumed and we will continue to specify the parametres of the close approach of the comet C/2013 A1 (Siding Spring) and Mars.
Originally posted by iforget
Hmm first Jupiter now Mars what comes next in that list? You're standing on it....
Elenin said that since C/2013 A1 is a hyperbolic comet and moves in a retrograde orbit, its velocity with respect to the planet will be very high, approximately 56 km/s. “With the current estimate of the absolute magnitude of the nucleus M2 = 10.3, which might indicate the diameter up to 50 km, the energy of impact might reach the equivalent of staggering 2×10¹º megatons!” An impact of this magnitude would leave a crater 500 km across and 2 km deep, Elenin said.
Originally posted by Phage
reply to post by Melbourne_Militia
1) An impact could change Mar's orbiting position/orbit?
2) Change the Tilt of the planet?
1) A chance of an imperceptible change.
2) A chance of a barely perceptible change
But I'd say a greater chance of neither.
Originally posted by whatnext21
I can't get Stellarium to work is there a trick to it, i am running Windows 7 and can't even get the shortcut to open after downloading?
No. It's sort of like a fly vs. 18 wheeler.
You have to wonder the following: could an impact of THAT magnitude affect the orbit of Mars,
That's possible, but it wouldn't get to us for a very long time.
or could we get hit with any large ejecta