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TOPIC: Deep Impact
Blobrana


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Ephemeris
Date       UT      R.A. (J2000) Decl.  Elong.  V        Motion      Distance
            h m                                      "/min   P.A.       km
2010 06 28 0200   05 54 24.2 -50 30 03  74.1  15.4   479.9  339.2      73801
2010 06 28 0400   05 33 00.3 -39 26 00  64.0  16.7   255.6  343.0     101112
2010 06 28 0600   05 23 41.0 -33 00 43  58.3  17.7   157.7  344.4     128736
2010 06 28 0800   05 18 21.6 -28 50 07  54.7  18.4   107.1  345.1     156219
2010 06 28 1000   05 14 52.6 -25 53 50  52.3  19.0   77.64  345.5     183467
2010 06 28 1200   05 12 24.2 -23 42 46  50.5  19.4   59.00  345.7     210477
2010 06 28 1400   05 10 32.9 -22 01 18  49.1  19.8   46.43  345.9     237268
2010 06 28 1600   05 09 06.1 -20 40 18  48.1  20.2   37.55  346.1     263867
2010 06 28 1800   05 07 56.3 -19 34 02  47.2  20.5   31.03  346.2     290294
2010 06 28 2000   05 06 58.9 -18 38 47  46.5  20.7   26.10  346.3     316571
2010 06 28 2200   05 06 10.9 -17 51 56  46.0  21.0   22.27  346.3     342715
2010 06 29 0000   05 05 30.0 -17 11 42  45.5  21.2   19.24  346.4     368741
2010 06 29 0200   05 04 54.8 -16 36 44  45.1  21.4   16.80  346.5     394662
2010 06 29 0400   05 04 24.1 -16 06 04  44.7  21.5   14.81  346.6     420488
2010 06 29 0600   05 03 57.2 -15 38 55  44.4  21.7   13.15  346.6     446229


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Blobrana


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Deep Impact Spacecraft to Make Last Swing by Earth on Way to 2nd Comet

On Sunday, NASA's historic Deep Impact spacecraft will fly past Earth for the fifth and last time on its current University of Maryland-led EPOXI mission. At time of closest approach to Earth, the spacecraft will be about 30,400 kilometres above the South Atlantic.
Mission navigators have tailored this trajectory to change the shape of the spacecraft's orbit and to boost it on its way to the mission's ultimate flyby, a close encounter with comet Hartley 2 in November.
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NASA Spacecraft Burns for Home, Then Comet

NASA's Deep Impact/Epoxi spacecraft has successfully performed a trajectory correction manoeuvre to refine its orbit prior to an upcoming Earth flyby June 27. The manoeuvre, along with the Earth flyby, will place the spacecraft on a trajectory to fly past comet Hartley 2 on Nov. 4.
The manoeuvre began at 2 p.m. EST (11 a.m. PST) today, when the spacecraft fired its engines for 11.3 seconds. While the burn changed the spacecraft's velocity by only 0.1 meters per second (less than a quarter mile per hour), that was all the mission's navigators requested to set the stage for an Earth gravity assist on June 27.
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Blobrana


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Blobrana


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EPOXI spacecraft
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A robotic probe sailing out in space to look for planets beyond the solar system has its first target in sight - Earth.
The idea behind observing the home planet is to give scientists an understanding of how an alien Earth may look in the data collected by future telescopes, chemical-analysing spectrographs and other instruments.

"It's basically an extra tool to have in our tool belt as we go looking for exoplanets" - Nicolas Cowan, with the University of Washington.

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To find out what water might look like on alien worlds, a group of researchers decided to see how Earth's oceans would appear from afar, as if from another planet.
Using the Deep Impact/EPOXI spacecraft, currently headed for a rendezvous next year with comet Hartley 2, they peered back at Earth from more than 50 million kilometres away, tracking the way reflected light changes as oceans rotate in and out of view.
From that distance, Earth's surface features were blurred, but the presence of water passing through the spacecraft's view increased the planet's blueness. Landmasses, on the other hand, lent a reddish hue. The team of researchers was able to assemble from those colour variations a rough map of the liquid and land boundaries on Earth, presented in a paper set to be published in the Astrophysical Journal.

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Blobrana


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Ephemerides:
Date       UT      R.A. (J2000) Decl.  Elong.  V        Motion      Distance
            h m                                      "/min   P.A.       km
2008 12 30 2300   18 31 35.6 +52 40 05  75.8  18.7   24.34  355.4     365974
2008 12 31 0000   18 31 22.9 +53 03 30  76.2  18.8   22.66  355.3     379251
2008 12 31 0100   18 31 10.9 +53 25 19  76.5  18.9   21.16  355.3     392508
2008 12 31 0200   18 30 59.5 +53 45 43  76.9  18.9   19.80  355.2     405745


										


									

									
									
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Orbital elements:
EPOXI
   Perigee 2008 Dec 29.986202 TT = 23:40:07 (JD 2454830.486202)
Epoch 2008 Dec 30.0 TT = JDT 2454830.5                  Find_Orb
q 52115.622km            (2000.0)            P               Q
H   30.4  G 0.15   Peri.  311.3051       0.1697996      -0.1188479
                   Node   281.6164      -0.2878033       0.9434438
e   2.387038       Incl.   92.8736      -0.9425164      -0.3094976
From 6 observations 2008 Dec. 28-28
Ephemerides:

Date (TT)  HH   RA              Dec         delta   r     elong mag  '/hr   PA

2008 12 29 00  06 39 47.351   -30 02 23.45  329487 0.9847 126.7 19.0 30.28 183.4
2008 12 29 01  06 39 38.847   -30 33 49.66  316809 0.9846 126.2 19.0 32.75 183.4
2008 12 29 02  06 39 29.532   -31 07 52.91  304109 0.9846 125.6 18.9 35.54 183.4
2008 12 29 03  06 39 19.280   -31 44 54.06  291385 0.9845 125.0 18.8 38.70 183.4
2008 12 29 04  06 39 07.939   -32 25 17.88  278638 0.9844 124.3 18.8 42.32 183.4
2008 12 29 05  06 38 55.316   -33 09 33.95  265866 0.9844 123.6 18.7 46.48 183.5
2008 12 29 06  06 38 41.175   -33 58 17.93  253069 0.9843 122.8 18.6 51.29 183.5
2008 12 29 07  06 38 25.212   -34 52 13.24  240249 0.9842 121.9 18.5 56.90 183.5
2008 12 29 08  06 38 07.037   -35 52 13.18  227405 0.9841 120.9 18.4 63.51 183.6
2008 12 29 09  06 37 46.136   -36 59 24.00  214538 0.9841 119.8 18.3 71.35 183.6
2008 12 29 10  06 37 21.819   -38 15 08.96  201652 0.9840 118.5 18.2 80.75 183.7
2008 12 29 11  06 36 53.138   -39 41 14.16  188751 0.9839 117.1 18.1 92.16 183.8
2008 12 29 12  06 36 18.747   -41 19 56.70  175840 0.9839 115.5 18.0 106.2 183.8
2008 12 29 13  06 35 36.669   -43 14 16.72  162930 0.9838 113.6 17.9 123.7 184.0
2008 12 29 14  06 34 43.874   -45 28 15.00  150038 0.9837 111.3 17.8 145.8 184.1
2008 12 29 15  06 33 35.453   -48 07 19.59  137187 0.9837 108.7 17.7 174.4 184.3
2008 12 29 16  06 32 02.883   -51 19 06.44  124416 0.9836 105.5 17.6 212.1 184.6
2008 12 29 17  06 29 49.891   -55 14 21.84  111788 0.9835 101.6 17.5 262.7 185.1
2008 12 29 18  06 26 20.952   -60 08 36.63   99405 0.9834  96.7 17.4 332.2 185.8
2008 12 29 19  06 20 00.524   -66 24 15.53   87437 0.9834  90.4 17.4 429.4 187.2
2008 12 29 20  06 04 33.396   -74 32 11.06   76174 0.9833  82.2 17.4 565.7 190.9
2008 12 29 21  04 31 21.689   -84 49 48.24   66110 0.9832  71.3 17.7 751.1 213.9
2008 12 29 22  19 49 43.106   -79 32 29.45   58051 0.9831  56.9 18.4 974.1 343.9
2008 12 29 23  19 08 03.483   -61 51 43.32   53120 0.9831  39.1 20.1  1163 353.9
2008 12 30 00  18 56 51.099   -41 58 49.45   52364 0.9830  19.3 24.3  1197 356.1

										


									

									
									
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										The NASA/JPL Epoxi spacecraft fired its engines today to prepare for a Dec. 29 Earth flyby. The Epoxi mission is scheduled to fly past comet Hartley 2 in 2010. 

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										Title: The NASA EPOXI mission of opportunity to gather ultraprecise photometry of known transiting exoplanets
Authors: Jessie L. Christiansen, David Charbonneau, Michael F. A'Hearn, Drake Deming, Matthew J. Holman, Sarah Ballard, David T. F. Weldrake, Richard K. Barry, Marc J. Kuchner, Timothy A. Livengood, Jeffrey Pedelty, Alfred Schultz, Tilak Hewagama, Jessica M. Sunshine, Dennis D. Wellnitz, Don L. Hampton, Carey M. Lisse, Sara Seager, Joseph F. Veverka

The NASA Discovery mission EPOXI, utilizing the Deep Impact flyby spacecraft, comprises two phases: EPOCh (Extrasolar Planet Observation and Characterisation) and DIXI (Deep Impact eXtended Investigation). With EPOCh, we use the 30-cm high resolution visible imager to obtain ultraprecise photometric light curves of known transiting planet systems. We will analyse these data for evidence of additional planets, via transit timing variations or transits; for planetary moons or rings; for detection of secondary eclipses and the constraint of geometric planetary albedos; and for refinement of the system parameters. Over a period of four months, EPOCh observed four known transiting planet systems, with each system observed continuously for several weeks. Here we present an overview of EPOCh, including the spacecraft and science goals, and preliminary photometry results. 

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										NASA's Deep Impact spacecraft is aiming its largest telescope at five stars in a search for alien (exosolar) planets as it enters its extended mission, called Epoxi.
 Deep Impact made history when the mission team directed an impactor from the spacecraft into comet Tempel 1 on July 4, 2005. NASA recently extended the mission, redirecting the spacecraft for a flyby of comet Hartley 2 on Oct. 11, 2010.  
As it cruises toward the comet, Deep Impact will observe five nearby stars with "transiting exosolar planets," so named because the planet transits, or passes in front of, its star. The Epoxi team, led by University of Maryland astronomer Michael A'Hearn, directed the spacecraft to begin these observations Jan. 22. The planets were discovered earlier and are giant planets with massive atmospheres, like Jupiter in our solar system. They orbit their stars much closer than Earth does the sun, so they are hot and belong to the class of exosolar planets nicknamed "Hot Jupiters."  

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