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#361
Apr 9 2016 07:40am


The colour-changing comet
Released 07/04/2016 3:00 pm
Copyright: Spacecraft: ESA/ATG medialab; Data: ESA/Rosetta/VIRTIS/INAF-IAPS/OBS DE PARIS-LESIA/DLR; G. Filacchione et al (2016)

Comet 67P/Churyumov-Gerasimenko was seen changing colour and brightness by Rosetta’s Visible and InfraRed Thermal Imaging Spectrometer, VIRTIS, as more water-ice was exposed near its surface as it moved close to the Sun between August and November 2014.
In the three-month study period the comet moved from about 542 million km to 438 million km from the Sun, and the spacecraft-to-comet distance varied from about 100 km to 10 km, resulting in a range of illumination conditions and viewing geometries.
In general, the darkest portions of the comet, containing dry dust made out of a mixture of minerals and organics, reflect light at redder wavelengths, while active regions and the occasional ice-rich exposure is bluer.
The VIRTIS study shows that even in the first three months of study at the comet, global average changes are noticeable, with an overall trend of the comet becoming brighter and more water-ice-rich. This is particularly notable in the Imhotep region, which becomes overall bluer over time.
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#362
Apr 9 2016 01:53pm
Threads almost 2 years old. Safe to say these are not the origins you are looking for
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#363
Apr 9 2016 07:31pm
The comet is certainly interesting but this theory about it revealing origins of life on earth is a clickbait title. Also
" If it is found that the ratio of hydrogen and deuterium on 67P is the same as that found in the water of Earth's oceans, this will provide strong support for the idea that water was delivered to our planet by comets. Scientists back this idea because they argue that Earth would have been so hot during its formation that all water would have been driven off its surface, leaving it hot and arid."
is an interesting theory for sure but discovery of hydrogen and deuterium doesn't really say anything conclusive.
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#364
Apr 14 2016 08:51am


Comet on 9 April 2016 – OSIRIS wide-angle camera
Released 12/04/2016 2:30 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

OSIRIS wide-angle camera image taken on 9 April 2016, when Rosetta was 29.9 km from Comet 67P/Churyumov–Gerasimenko. The scale is 2.86 m/pixel.
The unique viewing geometry is such that the spacecraft is positioned almost exactly between the Sun and comet, revealing characteristics of the surface that cannot be seen otherwise.

Distance Rosetta ↔ 67P/CG 29.933 km
Distance 67P/CG ↔ Sun ...... 413890464 km 2.766687 AU
Distance Rosetta ↔ Earth ... 283050272 km 1.892074 AU
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#365
Apr 21 2016 12:01am
and here a close up from the next day:



Comet on 10 April 2016 – OSIRIS narrow-angle camera
Released 14/04/2016 5:30 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

OSIRIS narrow-angle camera image taken on 10 April 2016, when Rosetta was 30 km from Comet 67P/Churyumov–Gerasimenko. The scale is 0.55 m/pixel.
The unique viewing geometry is such that the spacecraft is positioned almost exactly between the Sun and comet, resulting in a near shadow-free view that reveals characteristics of the surface that cannot be seen otherwise.

Distance Rosetta ↔ 67P/CG. 30.062 km
Distance 67P/CG ↔ Sun ...... 413897344 km 2.766733 AU
Distance Rosetta ↔ Earth ... 283064544 km 1.892170 AU
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#366
Apr 21 2016 11:01am
Boogers?
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#367
Apr 25 2016 08:57pm


Comet on 21 April 2016 – OSIRIS wide-angle camera
Released 21/04/2016 4:00 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

OSIRIS wide-angle camera image taken on 21 April 2016, when Rosetta was 30.8 km from Comet 67P/Churyumov–Gerasimenko. The scale is 2.96 m/pixel.

Distance Rosetta ↔ 67P/CG . 30.829 km
Distance 67P/CG ↔ Sun ...... 425455808 km 2.843996 AU
Distance Rosetta ↔ Earth ... 308945664 km 2.065174 AU
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#368
May 4 2016 11:31pm
and another close-up:



Comet on 23 April 2016 – OSIRIS narrow-angle camera
Released 27/04/2016 6:00 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

OSIRIS narrow-angle camera image taken on 23 April 2016, when Rosetta was 29.6 km from Comet 67P/Churyumov–Gerasimenko. The scale is 0.53 m/pixel.
Distance Rosetta ↔ 67P/CG . 29.613 km
Distance 67P/CG ↔ Sun ..... 428055200 km 2.861372 AU
Distance Rosetta ↔ Earth .. 315277280 km 2.107498 AU
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#369
May 9 2016 08:54pm
and even closer:



Comet on 3 May 2016 – OSIRIS narrow-angle camera
Released 06/05/2016 6:00 pm
Copyright ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

OSIRIS narrow-angle camera image taken on 3 May 2016, when Rosetta was 18.8 km from Comet 67P/Churyumov–Gerasimenko. The scale is 0.33 m/pixel.
Distance Rosetta ↔ 67P/CG . 18.835 km
Distance 67P/CG ↔ Sun ...... 437737120 km 2.926092 AU
Distance Rosetta ↔ Earth ... 340321984 km 2.274912 AU

and here were the image fits in the greater context:

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#370
May 9 2016 09:34pm
That's not a close encounter, I can't reach out and touch it. This thread sucks.
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