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#281
Aug 14 2015 04:04am
here a link to an extensive article on the perihelion:

https://www.rt.com/news/312428-rosetta-comet-closest-sun/
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#282
Aug 14 2015 11:54pm
and how does it look from earth?

btw, cheers 'darkfire' :)



Released 13/08/2015 4:30 pm
Copyright Gemini Observatory/AURA

This series of images of Comet 67P/Churyumov–Gerasimenko was collected between 2014 and 2015 using the Association of Universities for Research in Astronomy’s Gemini Observatory. The first three images were obtained with the Gemini-South telescope, in Chile, while the fourth image was taken with the Gemini-North telescope, on Mauna Kea, Hawaii.
All images are centred on the comet and were obtained by stacking several short exposures; stars are also visible as streaks. North is up, east to the left; the direction to the Sun is indicated for each frame.
In the first image of the upper row, taken on 20 September 2014, the comet appears nearly point-like. At the time, it was around 500 million km from the Sun, or 3.3 AU (1 astronomical unit is equal to 150 million km, the mean distance between Earth and the Sun). In the second image, taken on 14 November 2014 – two days after the landing of Philae – the comet exhibits a faint tail to the upper left; it was about 450 million km (3.0 AU) from the Sun at the time. In both images, the comet is to the east with respect to the Sun.
For several months between the end of 2014 and the spring of 2015, the comet was too close to the Sun on the sky to be observed from Earth. During this time, it passed behind the Sun as seen from our perspective, and would later be visible to the west of the Sun. The comet was observed again from Gemini-South in the summer, as shown in the third image, taken on 30 June 2015, when the comet was around 200 million km (about 1.4 AU) from the Sun; the tail is visible towards the right.
As the comet moved towards northern latitudes, it became visible from the northern hemisphere in July 2015. The fourth image, taken from Gemini-North on 4 August 2015, shows a bright tail. The comet was around 186 million km (about 1.2 AU) from the Sun and about to reach perihelion on 13 August.
The two images in the lower row show a zoomed version of the 4 August image. On the left, the original image is shown (visualised in a colour scale) with the bright comet tail extending towards the right. On the right, the image was processed by subtracting a radially symmetric component from the coma to enhance possible anisotropies in its shape.
While the bulk of the tail points to the right, there is a notable high-density region pointing in a different direction, to the lower left. The comet nucleus (with Rosetta around it) is too faint to be seen, lying within the innermost pixel of this image.
The upper frames measure 100 000 km across and the lower frames 50 000 km across (at the distance of the comet).
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#283
Aug 17 2015 08:33am
Boulder flying by comet



Released 13/08/2015 4:30 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

This sequence of images, taken with Rosetta’s OSIRIS narrow-angle camera on 30 July 2015, show a boulder-sized object close to the nucleus of Comet 67P/Churyumov–Gerasimenko.
The images were captured on 30 July 2015, about 185 km from the comet. The object measures between one and 50 m across; however, the exact size cannot be determined as it depends on its distance to the spacecraft, which cannot be inferred from these images.
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#284
Aug 21 2015 07:14pm
finally a post-perihelion image:

Comet on 16 August 2015 – NavCam



Released 21/08/2015 5:00 pm
Copyright ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

This single frame Rosetta navigation camera image of Comet 67P/Churyumov-Gerasimenko was taken on 16 August 2015 from a distance of 331 km from the comet centre. The image has a resolution of 28.2 m/pixel and measures 28.9 km across.
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#285
Aug 28 2015 12:12am
and a few hours before perihelion:

Comet on 12 August 2015 – NavCam Animation



Released 26/08/2015 6:00 pm
Copyright ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

This series of images of Comet 67P/Churyumov–Gerasimenko was captured by Rosetta’s navigation camera on 12 August 2015 from a distance of 336 km from the comet centre. The images have an average resolution of 28.7 m/pixel and measure about 29.3 km across.
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#286
Sep 1 2015 08:06am
when is it hitting earth mate?
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#287
Sep 1 2015 10:53pm
Comet on 22 August 2015 – NavCam



Released 28/08/2015 4:00 pm
Copyright ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

This single frame Rosetta navigation camera image of Comet 67P/Churyumov-Gerasimenko was taken on 22 August 2015 from a distance of 336 km from the comet centre. The image has a resolution of 28.6 m/pixel and measures 29.3 km across.
The comet reached the closest point to the Sun along its 6.5-year orbit, or perihelion, on 13 August 2015. The comet’s activity, at its peak intensity around perihelion and in the weeks that follow, is clearly visible in the image, including a significant outburst.

and waiting for the results from:

The science instruments on Rosetta have also observed these outbursts and the teams are busy analysing the data to understand the nature of these events. These in-situ measurements are being complemented by astronomical observations from ground-based and near-Earth telescopes to try and understand the global impact of these events on the much larger coma of 67P/C-G.
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#288
Sep 1 2015 11:45pm
wow knowledge
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#289
Sep 7 2015 06:00pm
Comet on 26 August 2015 – NavCam



Released 04/09/2015 5:00 pm
Copyright ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

NAVCAM image of Comet 67P/C-G taken on 26 August 2015, about 415 km from the comet centre.
The scale is 35.4 m/pixel and the image measures 36.2 km across. The contrast was increased to reveal the full extent of the comet's activity.
This view shows the southern hemisphere of 67P/C-G, which had remained in darkness for over five and a half years until seasons changed on the comet in May. Currently, the southern hemisphere is experiencing a short summer, which will last about 10 months, until early 2016.
Ever since, several portions of the comet's surface that were previously cast in shadow were revealed, allowing scientists to identify four new regions on the nucleus of 67P/C-G.
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#290
Sep 10 2015 08:19am
Comet on 30 August 2015 – NavCam



Released 08/09/2015 4:00 pm
Copyright ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

This single frame Rosetta navigation camera image of Comet 67P/Churyumov-Gerasimenko was taken on 30 August 2015 from a distance of 404 km from the comet centre. The image has a resolution of 34.4 m/pixel and measures 18.9 km across.
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