93 Minerva Occultations
Sept. 6 2014
Event #2
Event location in video frame ID's
D: 1384.0 +0.5/-1.5
R: 1402.0 +0.5/-0.5
Event time in UTC
D: 8 6 28.76 ± 0.03
R: 8 6 29.38 ± 0.02
Duration of transition in frames
D: 0
R: 0
SN at event locations
D: 10.8
R: 13.9
Applied confidence level
D: 90 %
R: 90 %
===== Camera details =====
Camera : WAT-902H2 Ultimate
Frames integrated : 0
Video system : NTSC
==== Measurement info ====
Measurement tool : Limovie
Measured at Field level: False
# Measurements binned : 1
Normalisation : None
Time scale from tool : True
===== end of report ======
Event #1
Event location in video frame ID's
D: 432.0 +0.5/-0.5
R: 923.0 +0.5/-0.5
Event time in UTC
D: 8 5 51.91 ± 0.02
R: 8 6 8.29 ± 0.02
Duration of transition in frames
D: 0
R: 0
SN at event locations
D: 11.0
R: 11.0
Applied confidence level
D: 90 %
R: 90 %
===== Camera details =====
Camera : WAT-902H2 Ultimate
Frames integrated : 0
Video system : NTSC
==== Measurement info ====
Measurement tool : Limovie
Measured at Field level: False
# Measurements binned : 1
Normalisation : None
Time scale from tool : True
===== end of report ======
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Results using R-OTE from Tony Geoge
R-OTE measured a difference between the Primary Event magnitude drop and the Secondary Event magnitude drop. The measured mag drop during the primary event was 3.65, close to the predicted magnitude drop of 3.3. The measured magnitude drop during the secondary event was 2.85. When the min/max errors for both measurements are applied, there is no overlap of the measurements at the 90% confidence level. Therefore, the difference is statistically significant. The difference in measured magnitude drop may be due to starlight diffracting around the small satellite during the occultation.
Tony George
Primary Event:
D (rdg num) = 282.72 (+0.353/-0.273)
R (rdg num) = 174.36 (+0.304/-0.373)
D (seconds) = 9.401088 (+0.012/-0.009) @ 2014-09-06 08:05:51.918087
R (seconds) = 5.785058 (+0.010/-0.012) @ 2014-09-06 08:06:08.321687
dur (readings) = 490.36 (+0.495/-0.495)
dur (seconds) = 16.363209 (+0.017/-0.017)
B = 1851.08 (+/-) 10.584
A = 63.96 (+/-) 9.984
logLikelihood = -13461.78
nominal magDrop = 3.65
maximum magDrop = 3.84
minimum magDrop = 3.49
Bnoise = 391.74
Anoise = 221.01
SNR = 4.56
symmetry = 0.56
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Final Results from Brad Timerson
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The thinking at the moment is the second occultation is the satellite of Minerva called Gorgoneion
Secondary Event:
D (rdg num) = 585.61 (+0.361/-0.268)
R (rdg num) = 603.63 (+0.268/-0.361)
D (seconds) = 19.508417 (+0.012/-0.009) @ 2014-09-06 08:06:28.783047
R (seconds) = 20.109636 (+0.009/-0.012) @ 2014-09-06 08:06:29.384265
dur (readings) = 18.02 (+0.449/-0.449)
dur (seconds) = 0.601219 (+0.015/-0.015)
B = 1878.66 (+/-) 10.599
A = 135.99 (+/-) 47.912
logLikelihood = -7685.84
nominal magDrop = 2.85
maximum magDrop = 3.33
minimum magDrop = 2.52
Bnoise = 342.30
Anoise = 203.27
SNR = 5.09
symmetry = 0.59
I set up a second site about 18km to the West (chord #6) and this is the result of the same occultation from that site
Limovie graph
These are to two 6" F5.5 home made scopes used, ground the mirors myself over 20 years ago, I'm in the process of refiguring a pair of 8" F4 miirors to replace these mirrors. Reasons for the design, low weight, highly adjustable, low wind resitance, takes up less space.
Close up of the focusser sled
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With DAMIT model
