Difference: SpacecraftObservatoryWeb (60 vs. 61)

Revision 612016-07-07 - MiguelSanchez

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META TOPICPARENT name="WebHome"

Spacecraft and observatory web pages

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General information

  • The Herschel spacecraft has a modular design. On the left, facing the "warm" side and on the right, facing the "cold" side of the spacecraft, the middle image names the major components.:
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  * Herschel Observers' Manual (HTML) and PDF (6.2 MB)
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341-342 0341_0001 0341_0001 0341_0001 Some refinements based on pointing measurements carried out in OD330
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354-... 0341_0001 0341_0001 0341_0001  
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<--   * Summary of current pointing performances: can be found here
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  • A quite complete summary of the pointing performances during operations can be found here. See also the Experimental Astronomy paper. For information on current pointing figures based on ground-reprocessing, see here.
 
  • NEW A technical note on the Absolute Pointing Error (the estimation of its 68th percentile from calibration observations): CAS_APE_calc_1p1.pdf

Important pointing links

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  • The figure below shows the temperature evolution of the main mirror (M1), the Cyo Vacuum Vessel (CVV) and the Sun-Shade (SS) of the Herschel Spacecraft since OD 50 (2009-07-02) to OD 630 (2011-02-02) plus M1 and CVV comparison to OD 1445 (2013-04-29):
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M1CVVsunshade_temp_OD40-660.png M1CVV_temp_OD50-1445.png
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Radiation environment tracking

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  • The radiation monitor on-board Herschel is called SREM for Standard Radiation Environment Monitor. SREM raw and calibrated data products are delivered with the Herschel observations as part of the auxiliary context, inside the observation context. The SREM units detect and count electrons, protons and cosmic rays with a coarse spectral resolution and 20◦ angular resolution. The measurements are based on silicon diodes polarized in reverse by a high voltage. The SREM consists of three detectors, D1, D2 and D3, mounted in two heads. One head consists of a single silicon diode (D3) and its main entrance window is covered with an aluminium plate of 0.7mm, defining a lower energy threshold of ~0.5MeV for electrons and ~10MeV for protons. The other head uses to silion diodes (D1/D2) arranged in a telescope configuration. The main entrance window is covered with an aluminum plate of 2mm providing a threshold of 1.5MeV for electrons and 20MeV for protons.
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  • The radiation monitor on-board Herschel is called SREM for Standard Radiation Environment Monitor. SREM raw and calibrated data products are delivered with the Herschel observations as part of the auxiliary context, inside the observation context. The SREM units detect and count electrons, protons and cosmic rays with a coarse spectral resolution and 20◦ angular resolution. The measurements are based on silicon diodes polarized in reverse by a high voltage. The SREM consists of three detectors, D1, D2 and D3, mounted in two heads. One head consists of a single silicon diode (D3) and its main entrance window is covered with an aluminium plate of 0.7mm, defining a lower energy threshold of ~0.5MeV for electrons and ~10MeV for protons. The other head uses to silion diodes (D1/D2) arranged in a telescope configuration. The main entrance window is covered with an aluminum plate of 2mm providing a threshold of 1.5MeV for electrons and 20MeV for protons.
 
  • SREM calibrated 5-minutes-rebinned counts from the 30th of October 2009 to 29 April 2013, a second plot zooming on the large solar Flares on the 23rd Jan and on the 7th of March 2012, the largest ever in the history of the Herschel mission:
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sremr_od0170-1445.png sremr_od0950-1445.png
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  -- MiguelSanchez - 29 Apr 2013
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-- CraigStephenson - 11 Mar 2014
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-- CraigStephenson - 11 Mar 2014
  -- MiguelSanchez - 08 Apr 2015
 
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