(meteorobs) Obs: 12 Aug 2009 UT

David Oesper oesper at mac.com
Wed Aug 12 18:42:27 EDT 2009


Strong peak in activity seen between 0744 and 0809 UT!  Read on...

12 Aug 2009 0302-1000 UT (CDT 11 Aug 10:02 p.m. - 12 Aug 5:00 a.m.)

David Oesper
NW of Dodgeville, Wisconsin
43 00 39.5 N, 90 16 05.4 W, ~1110 ft.
Method: Visual, digital voice recorder, talking clock

P = Perseids
S = Others or Sporadic

SUMMARY:

0302-0315 3P, 1S; partly cloudy
0315-0330 2P; partly cloudy
0330-0345 0P, 1S; partly cloudy
0345-0400 0P; partly cloudy
0400-0415 2P, 1S; partly cloudy
0415-0430 2P; partly cloudy
0430-0445 5P; partly cloudy
0445-0500 3P; partly cloudy
0500-0515 0P, 1S; clear for remainder of night
0515-0530 2P
0530-0545 2P, 1S
0545-0600 0P
0600-0615 3P
0615-0630 2P
0630-0645 0P
0645-0700 1P
0700-0715 0P, 1S
0715-0730 6P
0730-0745 2P

0745-0800 16P  WOW!

0800-0815 4P, 1S
0815-0830 1P
0830-0845 4P
0845-0900 2P
0900-0915 5P
0915-0930 1P; twilight
0930-0945 1P; twilight
0945-1000 1P; twilight

DETAILED OBSERVATIONS:

0302 begin session
0302 partly cloudy; facing NNE
0303 P
0304 P
0306 S
0311 P; clouds are hardly moving at all, winds are calm
0317 P
0320 moon is up?
0323 moon now visible in NE, very orange
0326 still partly cloudy; mosquitos bad; an occasional firefly visits out of curiosity
0330 P
0331 S
0343 moon is going into a fortuitously-positioned bank of clouds, temporarily cutting out its glare; nice!
0348 sky conditions are improving; moon still behind cloud bank
0355 moon out of cloud bank, big blob of slow-moving clouds in the NE; begin housekeeping break (HB)
0401 end HB, now facing Her; black umbrella deployed; still partly cloudy
0404 S
0409 P
0413 P
0414 big blob of clouds overhead, moving slowly east to west; clouds bad
0424 P
0426 -2 or -1 P terminating deep into the SW; nice train; could have been brighter but clouds interfered
0429 clouds moving off to west
0432 P
0434 P
0436 P
0439 P
0445 -1 or -2 P in UMi w/nice train
0453 P
0500 -2 or -3 P btw Lyr & S Her
0500 P
0502 S
0503 only a few clouds near the horizon now, clear elsewhere; begin sky brightness measurements
0504 sky brightness: zenith SQM 20.03 ~5.6; viewing direction (45 deg.) SQM 20.18 ~5.7
0506 HB begin
0510 HB end; Milky Way visible in Cygnus
0516 now facing Lyr
0524 P
0527 P
0532 P
0544 S
0544 P
0602 P
0603 sky brightness: zenith SQM 19.72 ~5.5; viewing direction (45 deg.) SQM 20.06 ~5.6; Milky Way still visible in Cygnus
0604 P
0605 HB begin
0608 HB end; facing between Vega and the Head of Draco
0612 P
0618 P
0627 P
0648 P
0702 sky brightness: zenith SQM 19.29 ~5.2; viewing direction (45 deg.) SQM 19.98 ~5.6; Milky Way in Cygnus still faintly visible
0704 HB begin
0707 HB end; pointing towards the Head of Draco
0711 S
0717 P
0723 P
0725 P
0726 P
0727 P
0727 P
0744 P
0744 P
0746 P
0747 P
0748 -1 P
0748 P
0750 P
0750 P
0750 P
0751 P
0753 P
0753 P
0754 P
0754 P
0755 P
0757 P
0757 0 w/train P in Cam, but lower velocity then usual?
0800 0 or -1 P
0801 P
0802 P
0805 P
0807 S
0809 P
0829 P
0836 P
0839 P
0840 P
0845 P
0856 P
0856 P
0902 P
0902 sky brightness: zenith SQM - moon too close to zenith; viewing direction (45 deg.) SQM 19.47 ~5.3
0903 HB begin
0904 HB end
0907 P
0909 P
0912 -1 P right of Jupiter
0912 +0 P left of Jupiter
0912 astronomical twilight begins
0922 P
0934 P
0950 P
1000 end session

Limiting Magnitude = [(SQM-8.89)/2]+ 0.04
SQM = Sky Quality Meter





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