C/2013 A1 | Wikipedia audio article
Channel: wikipedia tts
Date: 03/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/C/2013_A1_(Siding_Spring)


00:02:01 1 Discovery
00:03:23 2 Encounter with Mars
00:05:30 2.1 Predicted effects
00:09:11 2.2 Actual effects
00:10:23 3 Observation
00:12:49 4 Gallery
00:12:58 4.1 Before comet flyby



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SUMMARY
=======
C/2013 A1 (Siding Spring) is an Oort cloud comet discovered on 3 January 2013 by Robert H. McNaught at Siding Spring Observatory using the 0.5-meter (20 in) Uppsala Southern Schmidt Telescope.At the time of discovery it was 7.2 AU from the Sun and located in the constellation Lepus. Comet C/2013 A1 probably took millions of years to come from the Oort cloud. After leaving the planetary region of the Solar System, the post-perihelion orbital period (epoch 2050) is estimated to be roughly 1 million years.C/2013 A1 passed the planet Mars very closely on 19 October 2014, at a distance of 140,496.6 ± 4.0 km (87,300.5 ± 2.5 mi; 0.000939162 ± 2.7×10−8 au)
. After its discovery, there was thought to be a chance of a collision with Mars, but this possibility was excluded when its orbit was determined more accurately.
All NASA Mars orbiters—including 2001 Mars Odyssey, Mars Reconnaissance Orbiter and MAVEN—as well as ESA's orbiter, Mars Express, and ISRO's orbiter, the Mars Orbiter Mission, reported a healthy status after the comet flyby on 19 October 2014. During the flyby, orbiters around Mars detected thousands of kilograms per hour of comet dust composed of magnesium, iron, sodium, potassium, manganese, nickel, chromium and zinc. In addition, the comet nucleus was determined to be between 400 and 700 meters (0.2 and 0.4 mi), much smaller than originally assumed. The nucleus rotates once every eight hours.