| ... | ... | @@ -19,6 +19,69 @@ Each capture is named after the station code and the acquisition date-time, in t |
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Each capture is saved as a FITS file (or compressed `.fit.gz` to save some disk space), enclosing the image itself (grey-scale) and a **header** with relevant metadata, also automatically produced by the Freeture software.
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Captures can be open, visualized and saved as bitmap images with the [PRISMA Widget](PRISMA Widget).
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An example of capture acquired by the ITPI01 - Pino Torinese camera is given below:
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An example of capture acquired by the ITPI01 - Pino Torinese camera is given below.
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{height=500px}
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Captures are usually oriented with the North direction corresponding to the negative ordinate axis (downwards, -y) and the East direction to the positive ordinate axis (rightward, +x).
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In the analysis process, captures are rotated counterclockwise by 90°, to match the reference frame with the North direction corresponding to the positive abscissa axis (+x) and the East direction to the positive ordinate axis (+y).
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The FITS header enclosed in each capture file lists the relevant metadata of the acquisition, such as time, coordinates, exposure time and others.
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An example of such header for the example capture by the ITPI01 - Pino Torinese camera is given below.
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Among all these keywords, the ones that are mandatory for the PRISMA pipeline are:
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- `DATE-OBS`: the acquisition date and time (UTC);
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- `EXPOSURE`: the exposure time of the capture (s);
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- `TELESCOP`: the name of the station.
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```
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SIMPLE = T / file does conform to FITS standard
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BITPIX = 16 / number of bits per data pixel
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NAXIS = 2 / number of data axes
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NAXIS1 = 1280 / length of data axis 1
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NAXIS2 = 960 / length of data axis 2
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EXTEND = T / FITS dataset may contain extensions
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FILENAME= 'ITPI01_20200101T000515_UT-0.fit' / name of the fits file
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DATE = '2020-01-01T00:05:17.239408' / date of the creation of the fits file
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DATE-OBS= '2020-01-01T00:05:15.6125' / acquisition date of the first frame
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OBS_MODE= 'SINGLE ' / 'SINGLE' 'SUM' 'AVERAGE' ('MEDIAN')
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ELAPTIME= 5. / end obs. date - start obs. date (sec.)
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EXPOSURE= 5. / frame exp (sec). 999999 if different exposure.
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ONTIME = 5. / total integration time, sum of each frame exp (
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FILTER = ' '
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TELESCOP= 'Pinotorinese' / station station
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OBSERVER= 'd.gardiol'
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INSTRUME= 'FRIPON-CAM'
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CAMERA = 'DMK23G445'
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FOCAL = 1.25
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APERTURE= 2.
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SITELONG= 7.764939 / geodetic WGS84 longitude (DD)
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SITELAT = 45.04124 / geodetic WGS84 latitude (DD)
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SITEELEV= 620. / geodetic WGS84 elevation (m)
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XPIXEL = 0.
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YPIXEL = 0.
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GAINDB = 15 / detector gain
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SATURATE= 0. / saturated value
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PROGRAM = 'FreeTure' / name of the acquisition software
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CREATOR = 'FRIPON ' / http://fripon.org
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BZERO = 0 /
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BSCALE = 1.
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RADESYS = 'ICRS '
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TIMESYS = 'UTC '
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EQUINOX = 2000. / equinox of equatorial coordinates
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CTYPE1 = 'RA---ARC' / projection and reference system
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CTYPE2 = 'DEC--ARC' / projection and reference system
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TIMEUNIT= 's '
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CD1_1 = 0. / deg/px
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CD1_2 = 0. / deg/px
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CD2_1 = 0. / deg/px
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CD2_2 = 0. / deg/px
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CD3_3 = 0. / fps
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CRPIX1 = 640
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CRPIX2 = 480
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CRVAL1 = 109.202853596831 / sidereal time (decimal degree)
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CRVAL2 = 45.04124 / geodetic WGS84 latitude (DD)
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K1 = 0. / R = K1 * f * sin(theta/K2)
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K2 = 0. / R = K1 * f * sin(theta/K2)
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O_BZERO = 32768.0 / Original BZERO Value
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END
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``` |
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\ No newline at end of file |
