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Post Info TOPIC: STEREO satellite


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RE: STEREO satellite
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NASA scientists said 3-D images of the sun taken by the Solar Terrestrial Relations Observatory are expanding our understanding of solar physics.
The images, to be released Monday on the Internet, television and at museums, are also expected to help improve space weather forecasting.

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On Feb. 25, 2007, NASA scientists were calibrating some cameras aboard the STEREO-B spacecraft and they pointed the instruments at the sun.
The purpose of the experiment was to measure the 'dark current' of STEREO-B's CCD detectors. The idea is familiar to amateur astronomers: Point your telescope at something black and see how much 'dark current' trickles out of the CCD. Later, when real astrophotography is taking place, the dark current is subtracted to improve the image.

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Transit of the Moon
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On Feb. 25, 2007 there was a transit of the Moon across the face of the Sun - but it could not be seen from Earth. This sight was visible only from the STEREO-B spacecraft in its orbit about the sun, trailing behind the Earth. NASA's STEREO mission consists of two spacecraft launched in October, 2006 to study solar storms. The transit starts at 1:56 am EST and continued for 12 hours until 1:57 pm EST. STEREO-B is currently about 1 million miles from the Earth, 4.4 times farther away from the Moon than we are on Earth. As the result, the Moon will appear 4.4 times smaller than what we are used to. This is still, however, much larger than, say, the planet Venus appeared when it transited the Sun as seen from Earth in 2004.

transit_stereo
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Credit NASA

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RE: STEREO satellite
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Twin Nasa spacecraft have returned panoramic images that will help scientists to study solar explosions capable of causing havoc on Earth.
The Stereo orbiters, which are nearing their final positions, will study violent solar eruptions known as Coronal Mass Ejections (CMEs).
CMEs hurl energetic particles at Earth that can disrupt power grids and satellite communications.
Stereo will give scientists information they need to forecast "space weather".
The new panoramic views, which stretch from the Sun to the Earth, are created by combining images from a suite of telescopes onboard the two spacecraft. Their data will allow scientists to track "solar fronts".

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RE: STEREO A satellite
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Stereo A image the Moon, taken with the H2 camera during the flyby on Dec 15th, 2006.

stereoADec15



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Loops of highly charged particles burst from an active region on the Sunís surface in this image, taken on December 4, 2006. Among the first images taken by STEREOís SECCHI/Extreme Ultraviolet Imaging Telescope, the image shows the Sunís roiling surface and atmosphere at temperatures around one million Kelvin (1.8 million degrees Fahrenheit). The ultraviolet light in this range is not typically visible to the human eye, so it is represented here in blue.

STEREO4dec2006
Expand (109kb, 1024 x 768)
Credit NASA

To understand how solar storms travel through the solar systems, scientists need a three-dimensional view of the storms. This view will be provided by the STEREO telescopes launched on October 25, 2006. STEREO consists of Sun observation systems orbiting the Sun in front of and behind the Earth. Just as two separate eyes give humans a three-dimensional view of the world, the views provided by each STEREO system can be combined to provide a three-dimensional view of the Sun. Though the first STEREO images were taken in early December, the two systems wonít be in position to give three dimensional images until April 2007.

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STEREO-B
Date       UT      R.A. (J2000) Decl.  Elong.  V        Motion      Distance

2007 01 01 0000 16 52 57.2 -27 06 59 25.4 4.73 096.7 874815
2007 01 02 0000 17 01 25.9 -27 19 15 24.5 4.76 095.7 876698
2007 01 03 0000 17 10 01.3 -27 29 30 23.6 4.82 094.6 876314
2007 01 04 0000 17 18 46.4 -27 37 40 22.7 4.91 093.5 873682
2007 01 05 0000 17 27 44.4 -27 43 42 21.8 5.03 092.3 868797
2007 01 06 0000 17 36 58.4 -27 47 26 20.7 5.19 091.2 861638
2007 01 07 0000 17 46 31.6 -27 48 41 19.7 5.38 090.0 852168
2007 01 08 0000 17 56 27.4 -27 47 11 18.5 5.61 088.7 840333
2007 01 09 0000 18 06 49.6 -27 42 34 17.2 5.88 087.4 826066
2007 01 10 0000 18 17 42.5 -27 34 26 15.9 6.20 086.1 809285
2007 01 11 0000 18 29 10.9 -27 22 12 14.4 6.58 084.7 789889
2007 01 12 0000 18 41 20.6 -27 05 07 12.7 7.03 083.3 767759
2007 01 13 0000 18 54 18.8 -26 42 18 10.9 7.57 081.7 742749
2007 01 14 0000 19 08 14.2 -26 12 29 8.8 8.23 080.1 714688
2007 01 15 0000 19 23 18.0 -25 34 01 6.6 9.04 078.4 683364
2007 01 16 0000 19 39 45.1 -24 44 41 4.3 10.06 076.7 648515
2007 01 17 0000 19 57 55.7 -23 41 16 3.0 11.38 074.8 609811
2007 01 18 0000 20 18 18.2 -22 19 10 5.0 13.13 072.7 566808
2007 01 19 0000 20 41 34.9 -20 31 20 9.2 15.55 070.6 518850
2007 01 20 0000 21 08 54.5 -18 06 33 14.9 19.12 068.4 464714
2007 01 21 0000 21 42 43.6 -14 45 38 22.6 25.84 067.3 400322
2007 01 22 0000 22 51 24.9 -08 52 11 39.4 61.40 070.2 325485
2007 01 23 0000 00 32 06.0 +00 54 03 65.3 70.80 068.0 298663
2007 01 24 0000 02 15 19.9 +10 46 36 91.7 64.04 070.6 312139
2007 01 25 0000 03 44 40.3 +17 21 13 113.3 48.75 076.0 356832
2007 01 26 0000 04 53 49.2 +20 35 49 129.0 35.21 081.7 419459
2007 01 27 0000 05 45 19.7 +21 51 46 140.0 25.75 086.3 490475
2007 01 28 0000 06 23 56.9 +22 09 17 147.9 19.44 089.9 564820
2007 01 29 0000 06 53 36.2 +21 59 42 153.8 15.18 092.7 640053
2007 01 30 0000 07 17 00.0 +21 38 01 158.2 12.20 094.9 715033
2007 01 31 0000 07 35 56.0 +21 11 20 161.6 10.05 096.6 789267


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NASA's twin Solar Terrestrial Relations Observatories (STEREO) sent back their first images of the sun this week and with them a view into the sun's mounting activity.
After a successful launch on Oct. 25 from Cape Canaveral Air Force Station, Fla., STEREO spent the first few minutes separating from its stacked configuration aboard the single Delta II rocket. Shortly afterwards, mission operations personnel at The Johns Hopkins University Applied Physics Laboratory, (APL) Laurel, Md., monitored the two observatories as they travelled in an elliptical orbit from a point close to Earth to one extending just beyond the moon.

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RE: STEREO satellites
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On October 25, 2006, two space probes from the STEREO mission were launched from the American space centre at Cape Canaveral, ushering in a new era in solar research. The Max Planck Institute for Solar System Research (MPS) in Katlenburg-Lindau is playing a major part in representing Germany on this international mission. Thanks to new 3-dimensional observation technology, the project is intended to improve our understanding of the processes on the sunís surface and their effect on the earthís atmosphere ("space weather").

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RE: STEREO satellite
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STEREO-A
Date UT R.A. (J2000) Dec.
2006 10 29 0000 13 37 16.7 -13 27 01
2006 10 30 0000 13 46 34.8 -12 21 10
2006 10 31 0000 13 54 33.7 -11 22 10
2006 11 01 0000 14 02 19.7 -10 22 28
2006 11 02 0000 14 10 09.2 -09 20 13
2006 11 03 0000 14 18 44.9 -08 09 55


STEREO-B
Date UT R.A. (J2000) Dec.
2006 10 29 0000 13 37 24.9 -13 26 14
2006 10 30 0000 13 46 44.8 -12 20 10
2006 10 31 0000 13 54 42.3 -11 21 20
2006 11 01 0000 14 02 31.2 -10 21 15
2006 11 02 0000 14 10 24.8 -09 18 27
2006 11 03 0000 14 19 07.1 -08 07 13


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