(meteorobs) IMO METEOR SUMMARY REPORT: 23/24-Jun-2004, Lew Gramer (GRALE)
Lewis J. Gramer
lgramer at upstream.net
Fri Jun 25 20:49:35 EDT 2004
It seems so long since I sent in a full report to IMO,
I thought I'd share just this one with the group! :)
(Also, this log may be of some general interest, as I
was plotting unusually high rates of the June Bootids,
for the night AFTER the predicted minor outburst. And
Pierre Martin, a highly experienced observer, plotted
throughout this period of time, and under very similar
conditions, and logged just ONE "JBO" for the entire
night: Pierre, I'm at a loss to explain this one?! It
seems outside the range of statistical "noise", yet I
can think of no factor to correct for the difference.
I admit up front my plotting skills have been little
practiced lately - but could plotting errors explain
away this many misidentified shower members?? I open
this chestnut up for comment from all our readers...)
Comments & brickbats are welcome from more experienced
observers - and questions are welcome from all! (As in,
"What on earth do all those numbers mean, Lew??" :>)
PS: I used my now-resurrected Excel spreadsheet to make
this report - thanks to Bob Lunsford for finding a copy!
Anyone interested in using this worksheet, let me know.
Clear skies,
Lew Gramer
==============================================================================
IMO METEOR SUMMARY REPORT
=========================
Observer's Name: Lew Gramer IMO Observer Code: GRALE
EVENING Date (UT): 23-Jun-2004 IMO Showers Active that Date:
MORNING Date (UT): 24-Jun-2004 SAG
Session Start Time (UT): 2:45
Session End Time (UT): 5:16
Observing Site Location: Halibut Point State Park, Rockport MA USA
IMO Location Code: None
Site Latitude: 42:41 N, Longitude: 070:38 W, Elevation: 20m
Observing Methods ("x" all that apply:)
X=Manual (pencil/paper) X=Plotting Charts
Showers Observed (Enter all IMO or other shower mnemonics you used):
Shower Name June Bootids June Lyrids Sagittarids
3-letter Code JBO JLY SAG
Longitude 223 280 278
Declination +47 +35 -23
Radiant Size 10 5 10
Right Ascen. 14:52 18:40 18:32
=========================
PERIOD SUMMARIES
=========================
Summary of All Meteor Data for the Session
Per Start End CFV Teff LM F JBO JLY SAG Spor TOTAL
1 2:45 4:00 17h+70 0.94 6.18 1.0 5 0 0 12 17
2 4:01 5:16 17h+70 0.93 6.41 1.0 6 1 1 9 17
TOTALS 1.86 6.29 1.0 11 1 1 21 34
AVERAGE MAGNITUDES 3.55 3.00 4.00 3.93 3.78
IMO Visual Meteor Report - Lew Gramer (GRALE), Night of 23-Jun-2004
LIMITING MAGNITUDES CLOUDS / OBSTRUCTIONS
Time Field Count LM Start End % Obscured Duration
3:00 15 13 6.1 0% 0:00
3:00 19 10 6.1
3:50 1 14 6.1
3:50 7 20 6.4
4:25 1 16 6.4
4:25 7 21 6.4
4:55 1 17 6.5
4:55 7 20 6.4
5:16 1 18 6.6
5:16 7 18 6.3
BREAKS
Start End Duration Breaktime
3:10 3:20 0:10 Per Period
4:35 4:45 0:10 Period 1: 0:10
Period 2: 0:10
Deadtime: 0:00:10/meteor 0:00:50/plot
Total - logs plus plots # Plots Per Period
Period 1: 0:08:40 7
Period 2: 0:09:30 8
IMO Visual Meteor Report - Lew Gramer (GRALE), Night of 23-Jun-2004
=========================
MAGNITUDE DISTRIBUTIONS
=========================
0 1 2 3 4 5 6 7 TOTAL
JBO 0 0 0 6 4 1 0 0 11
JLY 0 0 0 1 0 0 0 0 1
SAG 0 0 0 0 1 0 0 0 1
Spor 0 0 1 3.5 12.5 4 0 0 21
TOTAL 0 0 1 10.5 17.5 5 0 0 34
TRAIN DATA - Totals
Meteors with trains: 3
Percentage with trains: 9%
Per Shower Train Data
JBO JLY SAG Spor TOTAL
Number 2 0 0 1 3
Percent 18% 0% 0% 5%
=======================
GENERAL COMMENTS ABOUT SESSION
=======================
Beautiful night, with light breeze and few bugs.
Temp in 60sF. Humidity rather high and variable.
Out with Mike Aramini, who did not record.
Plots done with NO prior knowledge of JBO radiant.
15:31+46 Actual JBO radiant found on plots
14:50+47 JBO peak-night radiant in IMO Call for Observation
15:12+49 JBO Call for Obs radiant with 3o Zenithal attraction
About 4o Angular distance, my "radiant" to predicted radiant
DCV = Distance from Center of Vision
Average DCV all meteors tonight: 15o
Plotting Accuracy: I - beginning and end well-seen,
II - less certain, III - general direction only
==============================================================================
INDIVIDUAL METEOR DATA
=======================
Time Mag Spd Shwr Const DCV Clr Trn Chart# Accur Comments
2:47 3.5 1 Spor Dra 10
2:49 4 1 JBO? E Dra 20 + 3 II Path 8o from 15:31+46
2:54 4.5 3 Spor Cep 20
2:58 4 2 Spor UMi 10
3:00 4 4 Spor W UMa 20
3:04 4.5 2 Spor W Dra 0 2 I
3:25 4 3 Spor Cep 10
3:28 5 3 Spor Dra 0
3:29 2 2 Spor C Dra 20 + 3 I Considered possible JLY
3:33 5 2 JBO E Dra 0 3 II Assume 15:31+46 radiant
3:34 3 1 JBO E UMa 30 gold + 2 I Assume 15:31+46 radiant
3:38 4 3 Spor W Dra 20
3:41 3.5 3 Spor Her 30 9 II Considered possible JLY
3:46 4 1 JBO C Dra 10 3 I
3:50 4 2 Spor Cep 30
3:53 3.5 3 Spor Dra 10
3:54 3 1 JBO? UMi 10 Slow, guessed radiant
4:01 3.5 3 Spor Dra 10
4:04 4 2 Spor UMi 10 3 I
4:07 3 2 JBO C Dra 10 3 I
4:12 3 4 JLY? Cas 40
4:17 4 3 Spor UMi 10
4:19 4 2 Spor Her 10 3 I
4:21 5 3 Spor Cep 0
4:26 3 5 Spor E Peg 40 Possible South Apex
4:28 3 0 JBO? Her 20 3 I Too short to make Speed
est.; 7o from 15:31+46
4:46 3.5 2 Spor UMa 10
4:50 3 2 JBO W UMa 40 2 I
4:55 3 2 JBO W Dra 20 2 I
4:59 4 4 Spor Cam 20
5:02 4 3 SAG Cyg 10
5:04 4 2 JBO E Dra 10 3 I
5:09 5 3 Spor Cep 0
5:15 4 2 JBO E UMa 20 2 I
==============================================================================
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