ROSAT : The Roentgen Satellite

https://heasarc.gsfc.nasa.gov/docs/rosat/rosat.html

Lifetime : 1 June 1990 - 12 February 1999
Energy Range :  X-ray 0.1 - 2.5 keV , EUV 62-206 eV
Special Feature :  All sky-survey in the soft X-ray band
Payload :

• An X-ray telescope used in conjunction with one  of the following instruments (0.1-2.5 keV)

  • Position Sensitive Proportional Counter
         (PSPC) 2 units : detector B, used for the pointed phase,      & detector C ,used for the survey
         FOV 2 ° diameter  eff area 240 cm² at 1 keV
           energy resolution of        deltaE/E=0.43 (E/0.93)^-0.5
    

  • High Resolution Imager (HRI)
          FOV 38 ' square ;  eff area 80 cm² at 1 keV  
         ~ 2 arcsec spatial resolution (FWHM)

  
  

• A Wide Field Camera with its own mirror system
      (62-206 eV)       FOV 5 ° diameter  

 Science Highlights:

• X-ray all-sky survey catalog, more than 150000 objects  

• XUV all-sky survey catalog (479 objects)

• Source catalogs from the pointed phase (PSPC and HRI)       containing ~ 100000 serendipitous sources

• Detailed morphology of supernova remnants and clusters of galaxies.

• Detection of shadowing of diffuse X-ray emission by molecular clouds.

• Detection (Finally!) of pulsations from Geminga.

• Detection of isolated neutron stars.

• Discovery of X-ray emission from comets.

• Observation of X-ray emission from the collision of  Comet Shoemaker-Levy with Jupiter.

Archive  : Catalogs, Spectra, Lightcurves, Images and Raw data

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Chandra X-ray Observatory
https://heasarc.gsfc.nasa.gov/docs/chandra/chandra.html

Lifetime :23 July 1999 - (nominal 5 year mission)
Energy Range : 0.1-10 keV
Special Features :  64 Hours highly-eccentric Earth orbit.
Spatial resolution < 1 arcsec
Payload :
 A single Wolter Type 1 grazing incidence iridium-coated imaging  telescope with a ghost free FOV ~ 30´ diameter and an   effective area of 800 and 400 cm² @ 0.25 and 5 keV  respectively.
Four detectors could be inserted, one at a time, into the  focal plane. Two of these were designed to be used primarily with   the gratings.

• AXAF Charged Coupled Imaging Spectrometer
  (ACIS; 0.2-10 keV)         2 CCD arrays for a total of 10 chips. 8 chips are Front          Illuminated (FI) and 2 are Back Illuminated (BI).
          FI: Eff area 340 cm² @ 1 keV, E/dE = 20-50 @ 1 and 6 keV
          BI: Eff area 340 cm² @ 1 keV, E/dE = 9-35 @ 1 and 6 keV        

  • ACIS-I. One 4-chip imaging array, all FI.             FOV 16´ X 16´        

  • ACIS-S. One 6-chip spectroscopic array, 4 FI and 2 BI              FOV 8´ X 48´. To be used primarily with the grating.        

• High Resolution Camera (HRC; 0.1-10 keV)
  2 micro-channel plate          detectors.        

  • HRC-I One 90mm square detector optimized  for imaging. FOV             ~30´ X 30´, eff. area 225 cm² @ 1 keV,               ~ 0.5 arcsec spatial resolution          

  • HRC-S One 20 X 300 mm rectangular detector optimized for use with             the LETG transmission gratings experiment. FOV 7´ X 97´        

• High Energy Transmission Grating + ACIS-S (HETG; 0.5-10 keV)
            spectral resolving power (E/dE) 60-1000.    

• Low Energy Transmission Grating + HRC-S (LETG; 0.08-6 keV)
            spectral resolving power (E/dE) 30-2000.  

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