2019-11-21
==========

Mt. Kent
CDK700
Apogee U16 camera
Interference filter wheel

Observer: Rhodes Hart


Camera -10C


Filters for M42


 S_II_(672/2)
 H_a_(656/3)
 RC_(645/5) (Red continuum)
 O_III_(501/3)
 Clear

M42 Orion Nebula
================
        
       13 128s  Ha    Focus 10050um   Best could do was FWHM~7px=2.8"
       14       SII
       15       Red Cont.
       16       OIII
       17       Clear
       18       Ha
       19       SII
       20       Red  Cont.
    21-23       OIII
    24-25       SII
    26-27       Red  Cont.
    

Calibration
===========

    28-36      bias
    37-41 128s dark  


Processing
==========

John Kielkopf

File names and headers corrected to include filter information.
Dark and bias corrected with tonight's calibration.
WCS headers added with local astrometry.net.
       
There are two 128s H-alpha exposures, and 4 each exposures of 128s in the other
filters.  The additional exposures are intended at add signal for features that
are weaker.

 m42_oiii_00021_dw.fits  Exposure: 128.0   FILTER: O_III_501/3
 m42_oiii_00016_dw.fits  Exposure: 128.0   FILTER: O_III_501/3
 m42_oiii_00022_dw.fits  Exposure: 128.0   FILTER: O_III_501/3
 m42_oiii_00023_dw.fits  Exposure: 128.0   FILTER: O_III_501/3

 m42_sii_00014_dw.fits   Exposure: 128.0   FILTER: S_II_672/2
 m42_sii_00019_dw.fits   Exposure: 128.0   FILTER: S_II_672/2
 m42_sii_00024_dw.fits   Exposure: 128.0   FILTER: S_II_672/2
 m42_sii_00025_dw.fits   Exposure: 128.0   FILTER: S_II_672/2

 m42_rc_00015_dw.fits    Exposure: 128.0   FILTER: RC_645/5
 m42_rc_00020_dw.fits    Exposure: 128.0   FILTER: RC_645/5
 m42_rc_00026_dw.fits    Exposure: 128.0   FILTER: RC_645/5
 m42_rc_00027_dw.fits    Exposure: 128.0   FILTER: RC_645/5

 m42_ha_00018_dw.fits    Exposure: 128.0   FILTER: H_a_656/3
 m42_ha_00013_dw.fits    Exposure: 128.0   FILTER: H_a_656/3
 m42_ha_00012_dw.fits    Exposure: 8.001   FILTER: H_a_656/3

 m42_clr_00017_dw.fits   Exposure: 128.0   FILTER: Clear


Coadded with swarp for each filter with resampling

m42_ha_coadd.fits 256 seconds
m42_rc_coadd.fits 512 seconds
m42_sii_coadd.fits 512 seconds
m42_oiii_coadd.fits 512 seconds


Color image rendered in ds9 aligned on WCS
H alpha - red
SII - green
OIII - blue

Log scaling


The individual png representations of the the coadded images are also log
scaling, produced with fits_to_log_png.py from Python Alsvid package.