
15-02-2014, 02:43 PM
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Registered User
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Join Date: Sep 2005
Location: Melbourne
Posts: 1,481
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What is this PHD Log telling me?
Hi Guys,
Trying to make some sense of a PHD log from my last guising session.
It's a 3 hour log which did include some wind gusts guiding a 12.5" f/5 with an OAG, Lodestar and Canon 400D.
I was able to get 5 min shots with round stars, with about 70% of frames usable.
Trying to improve the "brain" set up using this data in PHD.
One obvious thing is that I was 11 arc minutes away from the SCP in terms of polar alignment - is this meant to be in DEC, RA, or both?
Any commentary people can provide would be great.
Thanks in advance,
John K.
Analysis covers 01:15 AM to 04:15 AM
Guiding errors
RA peak error
RA RMS error
DEC peak error
DEC RMS error
Combined peak error
Combined RMS error
Correction drive analysis
Frames with correction
Corrections at max
Average percent of max corr.
Periodic errors in RA
Top 5 periodic components in RA error, showing period & amplitude. Amplitude is relative to the DC offset.
DC offset
108.3 minutes
24.17 seconds
21.7 minutes
1.8 minutes
2.2 minutes
Drift estimate
DEC drift / minute
Std error of drift mean
Estimated polar-alignment error: 11.24 arcmins, based on specified guide-star declination of -58º. Experimental estimate for non-drift-check events.
Field rotation
Estimated maximum field-rotation per minute at farthest edge of imaging field for various guider-to-imager alignment offsets in multiples of imager FOV. Guidestar-to-edge angles in arcmins.
Alignment
Concentric:
Offset 0.5 FOV:
Offset 1 FOV:
Offset 1.5 FOV:
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