Imaging on Mar 23, 2003
at Mar 25 Coordinates

I took 3 images tonight with clear filters this time to show the moons. The weather was at its best, the skies were crystal clear. This time no one jumped ahead of me so I think they were not altered. I am having trouble getting clear pictures out of these images. Maybe I should go back to using red filters.

Naji

Frames / Dark Mar23c-1.ZIP Mar23c-2.ZIP Mar23c-3.ZIP Flat-Clear.ZIP

Reqs 328 106 112 248

%Bytes 1.54% 0.42% 0.41% 1.12%

Last Time 23/Mar/03 09:29 23/Mar/03 09:31 23/Mar/03 09:27 23/Mar/03 09:30

Once again, these are FITS files, which means one must use a FITS viewer which can be downloaded from a Harvard site. 

Note: the Frames Zip files are missing and cannot be located. We appologize. This is true for all images collected during March, 2003. However, all images collected from September, 2002 through Febaruary, 2003 are available.

IRIS commands that I used:

1 - Prepare flat frame:
    From the flat frame header, it was exposed for 2.5 seconds. There is no 2.5 seconds 
    dark to use, only 10 seconds dark or above. The Bias frame is zero seconds dark, so
    I used it as my dark for flat subtraction. The difference between 10 seconds dark 
    and 0 seconds dark(bias) is very small.

    From AVIS:
    Name ........... #3 Bias
    Path ........... C:\TEST\
    Size ........... 1024 x 1024
    Pixels ......... 1048576
    Minimum value .. 17116 @ 0,20
    Maximum value .. 17818 @ 28,509
    Background ..... 17155
    Average ........ 17155.197

    Sum ............ 17988527355
    Std.deviation .. 16.769332
    Name ........... #1 dark10.fts
    Path ........... C:\TEST\
    Size ........... 1024 x 1024
    Pixels ......... 1048576
    Minimum value .. 17139 @ 562,0
    Maximum value .. 50455 @ 28,509
    Background ..... 17180
    Average ........ 17183.394

    Sum ............ 18018094464
    Std.deviation .. 36.303784

Commands that I used:
    load flatc
    sub bias 0
    save flatcb
2 - Use Avis to get flatcb average = 5599
3 – Subtract the images from the dark.
    sub2 mar23c- dark mar23c-d- 0 3
4 – Divide by flatcb and multiply by its average as reported by Avis.
    div2 mar23c-d- flatcb mar23c-df- 5599 3 

Weather report::

70° Clear Feels Like N/A°
UV Index: 0 Minimal
Dew Point: 28°
Humidity: 21%
Visibility: Unlimited 
Pressure: 30.07 inches and rising
Wind: From the West Northwest at 8 mph
As reported at Davis/Monthan, AZ Last Updated Saturday, March 22, 2003, at 7:55
PM Mountain Standard Time (Saturday, 9:55 PM EST).

66° Clear Feels Like N/A°
UV Index: 0 Minimal
Dew Point: 30°
Humidity: 26%
Visibility: Unlimited 
Pressure: 30.08 inches and rising
Wind: From the West at 5 mph
As reported at Davis/Monthan, AZ Last Updated Saturday, March 22, 2003, at 8:55
PM Mountain Standard Time (Saturday, 10:55 PM EST).