An image on 04 November shows some activity in the way of the jets emanating from the central region of comet 67P/Churyumov-Gerasimenko.
For the past couple of weeks I’ve developed quite an interest in what the cometary “soil” is like and how it got to be the way it is. Happily we could get more clues just watching the Philae lander land on Wednesday. If the composition is very fine we could see quite a cloud kicked up relative to how much is at the landing site of course.
If you would like the four individual panels making up this image you can get them at Comet Watch
This image of comet 67P/Churyumov-Gerasimenko was obtained on October 30, 2014 by the OSIRIS scientific imaging system on the Rosetta spacecraft. The right half is obscured by darkness. The image was taken from a distance of approximately 18.6 miles (30 kilometers).
Image Credit: ESA/Rosetta/MPS for OSIRIS Team
Have a look at this Hubble image of Mars AND comet Siding Spring in the same field of view during the close pass on 19 October. The comet came as close as 140,000 km / 87,000 miles – only a third of our Earth to Moon distance. I am trying to imagine what that would be like.
This composite of NASA Hubble Space Telescope images captures the positions of comet Siding Spring and Mars in a never-before-seen close passage of a comet by the Red Planet, which happened at 2:28 p.m. EDT October 19, 2014. The comet passed by Mars at approximately 87,000 miles (about one-third of the distance between Earth and the Moon). At that time, the comet and Mars were approximately 149 million miles from Earth.
The comet image shown here is a composite of Hubble exposures taken between Oct. 18, 8:06 a.m. EDT to Oct. 19, 11:17 p.m. EDT. Hubble took a separate photograph of Mars at 10:37 p.m. EDT on Oct. 18.
The Mars and comet images have been added together to create a single picture to illustrate the angular separation, or distance, between the comet and Mars at closest approach. The separation is approximately 1.5 arc minutes, or one-twentieth of the angular diameter of the full Moon. The background starfield in this composite image is synthesized from ground-based telescope data provided by the Palomar Digital Sky Survey, which has been reprocessed to approximate Hubble’s resolution. The solid icy comet nucleus is too small to be resolved in the Hubble picture. The comet’s bright coma, a diffuse cloud of dust enshrouding the nucleus, and a dusty tail, are clearly visible.
This is a composite image because a single exposure of the stellar background, comet Siding Spring, and Mars would be problematic. Mars is actually 10,000 times brighter than the comet, and so could not be properly exposed to show detail in the Red Planet. The comet and Mars were also moving with respect to each other and so could not be imaged simultaneously in one exposure without one of the objects being motion blurred. Hubble had to be programmed to track on the comet and Mars separately in two different observations.
The images were taken with Hubble’s Wide Field Camera 3.
The Rosetta spacecraft is about to fire thrusters to slow down in preparation for its comet encounter in a few months.
Nine thruster burns between 21 May and 05 August (plus kind of a practice burn earlier this month) will slow Rosetta from 750 ms to just 1 ms so the encounter with comet 67P/Churyumov-Gerasimenko. The distance to the comet will decrease from a million kilometers to just 200 during this time.
Earth is set to cross the debris path of comet 209P/LINEAR on 24 May 2014. No one knows quite what to expect. I’ll be finding out provided we have decent clouds.
The video suggests the best time is going to be around 0600 to 0800 UTC. If you are on the east coast of North America earlier in that range might be better because daybreak will be shortly after 0800 UTC.
How to find Camelopardalis? On the 24th (or any other time in the near future) you can find Camelopardalis by looking north. If the meteor shower is as busy as it could be, the location will be self evident. However, if there are only a few meteors or you just want to find it and have no idea, find the “Little Dipper” aka: Ursa Minor, and look from the dipper part down the “handle”, it points right to the area.
NASA’s Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) now has a comet discovery.
Officially named “C/2014 C3 (NEOWISE)”, the first comet discovery of the renewed mission came on Feb. 14 when the comet was about 143 million miles (230 million kilometers) from Earth.
The odd thing about this comet is that is in a retrograde orbit. Amy Mainzer, the mission’s principal investigator from NASA’s Jet Propulsion Laboratory in Pasadena, Calif. “This comet is a weirdo – it is in a retrograde orbit, meaning that it orbits the sun in the opposite sense from Earth and the other planets.”