I've installed the latest ASTAP and was platesolving an image I took a few days ago with a 200 lens and a full frame camera so the FOV was at least 6 x 8 degrees. I have the D05 database installed. It did solve:
SIMPLE = T / C# FITS
BITPIX = 16
NAXIS = 2 / Dimensionality
NAXIS1 = 9576
NAXIS2 = 6388
BZERO = 32768
EXTEND = T / Extensions are permitted
IMAGETYP= 'LIGHT' / Type of exposure
EXPOSURE= 120.0 / [s] Exposure duration
EXPTIME = 120.0 / [s] Exposure duration
DATE-LOC= '2023-10-10T21:27:21.464' / Time of observation (local)
DATE-OBS= '2023-10-11T02:27:21.464' / Time of observation (UTC)
DATE-AVG= '2023-10-11T02:28:25.279' / Averaged midpoint time (UTC)
XBINNING= 1 / X axis binning factor
YBINNING= 1 / Y axis binning factor
GAIN = 101 / Sensor gain
OFFSET = 30 / Sensor gain offset
EGAIN = 0.243834167718887 / [e-/ADU] Electrons per A/D unit
XPIXSZ = 3.76 / [um] Pixel X axis size
YPIXSZ = 3.76 / [um] Pixel Y axis size
INSTRUME= 'ZWO ASI6200MM Pro' / Imaging instrument name
SET-TEMP= -10.0 / [degC] CCD temperature setpoint
CCD-TEMP= -10.1 / [degC] CCD temperature
USBLIMIT= 40 / Camera-specific USB setting
TELESCOP= 'Askar 200' / Name of telescope
FOCALLEN= 200.0 / [mm] Focal length
FOCRATIO= 4.0 / Focal ratio
RA = 319.09582753812 / [deg] RA of telescope
DEC = 68.2565038119104 / [deg] Declination of telescope
CENTALT = 66.2930811635305 / [deg] Altitude of telescope
CENTAZ = 356.683561346848 / [deg] Azimuth of telescope
AIRMASS = 1.09188090972636 / Airmass at frame center (Gueymard 1993)
PIERSIDE= 'East' / Telescope pointing state
SITEELEV= 310.0 / [m] Observation site elevation
SITELAT = 44.7269444444444 / [deg] Observation site latitude
SITELONG= -93.9897222222222 / [deg] Observation site longitude
FWHEEL = 'ZWOptical FilterWheel' / Filter Wheel name
FILTER = 'RED' / Active filter name
OBJECT = 'Ghost Nebula' / Name of the object of interest
OBJCTRA = '21 16 27' / [H M S] RA of imaged object
OBJCTDEC= '+68 15 29' / [D M S] Declination of imaged object
OBJCTROT= 338.0 / [deg] planned rotation of imaged object
ROTNAME = 'Manual rotator' / Rotator equipment name
ROTATOR = 335.177734375 / [deg] Mechanical rotator angle
ROTATANG= 335.177734375 / [deg] Mechanical rotator angle
ROTSTPSZ= 0.0 / [deg] Rotator step size
ROWORDER= 'TOP-DOWN' / FITS Image Orientation
EQUINOX = 2000.0 / Equinox of coordinates
SWCREATE= 'N.I.N.A. 2.3.0.9001 (x64)' / Software that created this file
CTYPE1 = 'RA---TAN' / first parameter RA , projection TANgential
CTYPE2 = 'DEC--TAN' / second parameter DEC, projection TANgential
CUNIT1 = 'deg ' / Unit of coordinates
CRPIX1 = 4.788500000000E+003 / X of reference pixel
CRPIX2 = 3.194500000000E+003 / Y of reference pixel
CRVAL1 = 3.190947901380E+002 / RA of reference pixel (deg)
CRVAL2 = 6.825681944769E+001 / DEC of reference pixel (deg)
CDELT1 = 1.063323738821E-003 / X pixel size (deg)
CDELT2 = 1.063347426382E-003 / Y pixel size (deg)
CROTA1 = -2.535238409215E+001 / Image twist X axis (deg)
CROTA2 = -2.537491307782E+001 / Image twist Y axis (deg) E of N if not flipped.
CD1_1 = 9.609165706035E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD1_2 = 4.556864461950E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD2_1 = -4.552984931665E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD2_2 = 9.607588729473E-004 / CD matrix to convert (x,y) to (Ra, Dec)
PLTSOLVD= T / Astrometric solved by ASTAP v2023.10.13.
COMMENT 7 Solved in 0.4 sec. Offset 2.1". Mount offset RA=1.4", DEC=-1.1"
WARNING = 'Large FOV, use G05 database! '
But the last warning says to use the G05 database? Is that necessary? Most of the time I'm imaging at focal length of 850 mm so FOV is about 2 x 3. Do I need to switch between 2 databases?
thanks for a wonderful app!
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The D05 will do fine for 6x8 degrees. It will work fine up to a FOV of 10 degrees or more as long the image is of good quality.
If the database setting is on auto mode you could install the G05 and it will switch automatically between the D05 and G05. But for 6x8 degrees there are no significant benefits except the warning goes away. There is sufficient overlap in the databases.
Han
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I've installed the latest ASTAP and was platesolving an image I took a few days ago with a 200 lens and a full frame camera so the FOV was at least 6 x 8 degrees. I have the D05 database installed. It did solve:
SIMPLE = T / C# FITS
BITPIX = 16
NAXIS = 2 / Dimensionality
NAXIS1 = 9576
NAXIS2 = 6388
BZERO = 32768
EXTEND = T / Extensions are permitted
IMAGETYP= 'LIGHT' / Type of exposure
EXPOSURE= 120.0 / [s] Exposure duration
EXPTIME = 120.0 / [s] Exposure duration
DATE-LOC= '2023-10-10T21:27:21.464' / Time of observation (local)
DATE-OBS= '2023-10-11T02:27:21.464' / Time of observation (UTC)
DATE-AVG= '2023-10-11T02:28:25.279' / Averaged midpoint time (UTC)
XBINNING= 1 / X axis binning factor
YBINNING= 1 / Y axis binning factor
GAIN = 101 / Sensor gain
OFFSET = 30 / Sensor gain offset
EGAIN = 0.243834167718887 / [e-/ADU] Electrons per A/D unit
XPIXSZ = 3.76 / [um] Pixel X axis size
YPIXSZ = 3.76 / [um] Pixel Y axis size
INSTRUME= 'ZWO ASI6200MM Pro' / Imaging instrument name
SET-TEMP= -10.0 / [degC] CCD temperature setpoint
CCD-TEMP= -10.1 / [degC] CCD temperature
USBLIMIT= 40 / Camera-specific USB setting
TELESCOP= 'Askar 200' / Name of telescope
FOCALLEN= 200.0 / [mm] Focal length
FOCRATIO= 4.0 / Focal ratio
RA = 319.09582753812 / [deg] RA of telescope
DEC = 68.2565038119104 / [deg] Declination of telescope
CENTALT = 66.2930811635305 / [deg] Altitude of telescope
CENTAZ = 356.683561346848 / [deg] Azimuth of telescope
AIRMASS = 1.09188090972636 / Airmass at frame center (Gueymard 1993)
PIERSIDE= 'East' / Telescope pointing state
SITEELEV= 310.0 / [m] Observation site elevation
SITELAT = 44.7269444444444 / [deg] Observation site latitude
SITELONG= -93.9897222222222 / [deg] Observation site longitude
FWHEEL = 'ZWOptical FilterWheel' / Filter Wheel name
FILTER = 'RED' / Active filter name
OBJECT = 'Ghost Nebula' / Name of the object of interest
OBJCTRA = '21 16 27' / [H M S] RA of imaged object
OBJCTDEC= '+68 15 29' / [D M S] Declination of imaged object
OBJCTROT= 338.0 / [deg] planned rotation of imaged object
ROTNAME = 'Manual rotator' / Rotator equipment name
ROTATOR = 335.177734375 / [deg] Mechanical rotator angle
ROTATANG= 335.177734375 / [deg] Mechanical rotator angle
ROTSTPSZ= 0.0 / [deg] Rotator step size
ROWORDER= 'TOP-DOWN' / FITS Image Orientation
EQUINOX = 2000.0 / Equinox of coordinates
SWCREATE= 'N.I.N.A. 2.3.0.9001 (x64)' / Software that created this file
CTYPE1 = 'RA---TAN' / first parameter RA , projection TANgential
CTYPE2 = 'DEC--TAN' / second parameter DEC, projection TANgential
CUNIT1 = 'deg ' / Unit of coordinates
CRPIX1 = 4.788500000000E+003 / X of reference pixel
CRPIX2 = 3.194500000000E+003 / Y of reference pixel
CRVAL1 = 3.190947901380E+002 / RA of reference pixel (deg)
CRVAL2 = 6.825681944769E+001 / DEC of reference pixel (deg)
CDELT1 = 1.063323738821E-003 / X pixel size (deg)
CDELT2 = 1.063347426382E-003 / Y pixel size (deg)
CROTA1 = -2.535238409215E+001 / Image twist X axis (deg)
CROTA2 = -2.537491307782E+001 / Image twist Y axis (deg) E of N if not flipped.
CD1_1 = 9.609165706035E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD1_2 = 4.556864461950E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD2_1 = -4.552984931665E-004 / CD matrix to convert (x,y) to (Ra, Dec)
CD2_2 = 9.607588729473E-004 / CD matrix to convert (x,y) to (Ra, Dec)
PLTSOLVD= T / Astrometric solved by ASTAP v2023.10.13.
COMMENT 7 Solved in 0.4 sec. Offset 2.1". Mount offset RA=1.4", DEC=-1.1"
WARNING = 'Large FOV, use G05 database! '
But the last warning says to use the G05 database? Is that necessary? Most of the time I'm imaging at focal length of 850 mm so FOV is about 2 x 3. Do I need to switch between 2 databases?
thanks for a wonderful app!
Hi
The D05 will do fine for 6x8 degrees. It will work fine up to a FOV of 10 degrees or more as long the image is of good quality.
If the database setting is on auto mode you could install the G05 and it will switch automatically between the D05 and G05. But for 6x8 degrees there are no significant benefits except the warning goes away. There is sufficient overlap in the databases.
Han