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(meteorobs) Observation 08/08/2003
Hi!
I went out last night to get some of the last pre-peak-Perseids
without moon too much interfering.
The moon seems to reduce rates to about 40%, if my figures below are
correct (computed with sin(estimated radiant altitude)); moon set at
0:15 UT, which is in Period 6
Periods PER/h PER/h,Z*
1,2 4.0 6.1
3,4 4.1 5.0
5,6 4.7 5.5
7,8 12.1 13.6
9,10 13.2 14.4
* if the radiant would have been in zenith (roughly corrected)
but without magnitude corrections
So if the weather doesn't change, maximum night and the night before
(without moon) will be subjective maximum night, as activity the
night before will be about 40% of maximum activity (estimated by Carl
Johannink) when there's no moon disturbing, and in maximum night it
will be only 40% of maximum activity because of the moon. As there is
moonlight the night before the maximum, 12/13 will be best, I think.
Greetings
Daniel Gruen
----------
Day:08-09 Month:08 Year:2003
Begin: 22h08m, 05.08.
End: 1h32m, 06.08.
Location long. E9d26'20" latit. N48d51'55"
Site: Winnenden-Birkmannsweiler, near Stuttgart
Country: Germany
Observer: Daniel GRUEN IMO code: GRUDA
Any questions? Mail me (daniel_gruen@webdot de)
Showers:
-----------------------------------
| Shw |alpha|delta| Shw |alpha|delta|
|-----------------------------------|
| NIA | 317d| -07d| KCG | 284d| +58d|
|-----------------------------------|
| PER | 43d| +58d| NDA | 335d| -05d|
|-----------------------------------|
| SIA | 339d| -14d| SDA | 349d| -13d|
|-----------------------------------
| SPO | --- | --- |
-----------------
Periods:
-----------------------------------------------------------------
| Period |Field |Teff|F| lm |NIA|KCG|NDA|SIA|SDA|PER|SPO|SPO|
| (UT) |RA Dec | h | | m |M|N|M|N|M|N|M|N|M|N|M|N|M|N|M|N|
|---------------------------------------------------------------*-|
|22:08-22:31|340d|+50d|0.38|1|4.60|P|0|P|0|P|0|P|0|P|1|C|0|P|0|C|0|
|-----------------------------------------------------------------|
|22:31-22:55|340d|+50d|0.37|1|4.65|P|1|P|0|P|0|P|0|P|0|C|3|P|1|C|0|
|-----------------------------------------------------------------|
|22:55-23:18|340d|+50d|0.35|1|4.65|P|1|P|0|P|1|P|0|P|0|C|2|P|2|C|0|
|-----------------------------------------------------------------|
|23:18-23:40|340d|+50d|0.38|1|4.65|P|0|P|0|P|0|P|0|P|0|C|1|P|1|C|0|
|-----------------------------------------------------------------|
|23:48- 0:10| 0d|+55d|0.32|1|5.09|P|0|P|2|P|0|P|0|P|0|C|1|P|2|C|0|
|-----------------------------------------------------------------|
| 0:10- 0:30| 0d|+55d|0.32|1|5.09|P|0|P|1|P|0|P|0|P|0|C|2|P|1|C|0|
|-----------------------------------------------------------------|
| 0:30- 0:50| 0d|+55d|0.33|1|5.09|P|0|P|0|P|0|P|0|P|0|C|4|P|0|C|2|
|-----------------------------------------------------------------|
| 0:50- 1:10| 0d|+55d|0.33|1|5.09|P|0|P|0|P|0|P|0|P|0|C|4|P|0|C|0|
|-----------------------------------------------------------------|
| 1:10- 1:22| 15d|+55d|0.19|1|5.53|P|0|P|0|P|0|P|0|P|0|C|2|P|0|C|0|
|-----------------------------------------------------------------|
| 1:22- 1:32| 15d|+55d|0.19|1|5.53|P|0|P|0|P|0|P|0|P|0|C|3|P|0|C|1|
-----------------------------------------------------------------
* these are the meteors I didn't plot, either because there were
too many at a time or because they were too far from my fov;
they might as well be shower meteors
Magnitude Distribution:
------------------------------------------------
|Shower | -3| -2| -1| 0| +1| +2| +3| +4| +5| tot|
|-------|---|---|---|---|---|---|---|---|---|----|
|PER1-5 | |0.5|1.5|1.0|1.0|0.5|2.5| | | 7 |*
|PER6-10|1.0|2.5|0.5|3.0|1.0|2.0|2.5|2.5| | 15 |+
| PER |1.0|3.0|2.0|4.0|2.0|2.5|5.0|2.5| | 22 |~
| NIA | | | | | | |1.0|1.0| | 2 |
| KCG | | | | | |1.0|1.5|0.5| | 3 |
| NDA | |0.5|0.5| | | | | | | 1 |
| SDA | | | | | |0.5|0.5| | | 1 |
| SPO | | | |1.0|1.5|0.5|4.5|2.5| | 10 |
------------------------------------------------
* periods 1-5 (22:08 - 0:10)
+ periods 6-10 (0:10 - 1:32)
~ Perseids total
Train Distribution:
-----------------------------
|dur.|5s|4s|3s|2s|1s|<*|no|tot|
|----|--|--|--|--|--|--|--|---|
|PER | | 1| 2| | 5| 4|10| 22|
|NIA | | | | | | | 2| 2|
|KCG | | | | | | | 3| 3|
|NDA | | | | | | 1| | 1|
|SDA | | | | | | | 1| 1|
|SPO | | | | 1| | | 9| 10|
-----------------------------
* these trains persisted only for a few tenth of a second
Meteor Data:
(caution: I changed the order of the coordinates from
XBeg-YBeg-XEnd-YEnd to XBeg-XEnd-YBeg-YEnd)
--------------------------------------------------------
|No.| Time| Mag|Vel|Shw|Train|XBeg|XEnd|YBeg|YEnd|Map|Acc|
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|197|22:30| 2.5| 4 |SDA| - | 3| 62| 81| 102| 3 | 2 |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|198|22:31| 2.5|2-3|PER| - | | | | | | |
|199|22:41| 4.0| 2 |SPO| - | 96| 82| 92| 100| 3 | 3 |
|200|22:44|-0.5|4-5|PER| 1s | | | | | | |*
|201|22:45| 3.0|3-4|PER| - | | | | | | |*
|202|22:54| 4.0|2-3|NIA| - | 257| 238| 187| 194| 1 | 2 |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|203|23:02| 3.5|4-5|SPO| - | 172| 178| 215| 148| 3 | 2 |
|204|23:07|-1.5| 4 |PER| 3s | | | | | | |*
|205|23:08|-0.5| 3 |PER| 1s | | | | | | |*
|206|23:13| 3.0| 3 |NIA| - | 167| 152| 202| 242| 6 | 2 |~
|207|23:16| 3.0| 5 |SPO| - | 172| 178| 214| 147| 3 | 3 |
|208|23:17|-1.5| 2 |NDA| <1s | 181| 143| 166| 193| 1 | 3 |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|209|23:24| 3.0| 5 |PER| <1s | | | | | | |
|210|23:33| 3.0| 2 |SPO| - | 186| 169| 187| 240| 1 | 3 |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|211|23:48| 1.0|4-5|PER| <1s | | | | | | |
|212|23:53| 3.5| 3 |KCG| - | 196| 173| 186| 212| 1 | 2 |
|213|23:58| 0.5| 5 |SPO| - | 115| 110| 238| 193| 6 | 1 |
|214| 0:00| 3.0|2-3|SPO| - | 75| 33| 186| 194| 6 | 2 |
|215| 0:06| 3.0|3-4|KCG| - | 103| 77| 210| 165| 6 | 2 |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|216| 0:19|-2.5| 4 |PER| 3s | | | | | | |
|217| 0:22| 2.0| 2 |KCG| - | 159| 153| 193| 247| 3 | 2 |
|218| 0:26| 2.5| 5 |PER| - | | | | | | |
|219| 0:27| 0.5| |SPO| 2s | 188| 176| 150| 172| 1 | 1 |+
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|220| 0:36| 3.5|3-4|PER| - | | | | | | |
|221| 0:38| 2.5|3-4|PER| <1s | | | | | | |
|222| 0:39| 0.0| 3 |PER| - | | | | | | |
|223| 0:44| 3.5| 3 |SPO| - | | | | | | |
|224| 0:45| 3.5| 5 |SPO| - | | | | | | |
|225| 0:46| 3.5| 5 |PER| - | | | | | | |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|226| 0:53|-2.0| 5 |PER| <1s | | | | | | |
|227| 0:59| 0.0| 4 |PER| 1s | | | | | | |
|228| 1:03|-2.5| 4 |PER| 4s | | | | | | |
|229| 1:04| 0.0|4-5|PER| - | | | | | | |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|230| 1:13| 1.0|4-5|PER| - | | | | | | |
|231| 1:20| 2.0|3-4|PER| 1s | | | | | | |
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|232| 1:24| 1.5| 5 |SPO| - | | | | | | |
|233| 1:24| 4.0|3-4|PER| - | | | | | | |
|234| 1:25| 3.5|3-4|PER| - | | | | | | |
|235| 1:26|-1.5| 5 |PER| 1s | | | | | | |
--------------------------------------------------------
enumeration starts in the 20/02/2003 session
all coordinates in mm from the lower left corner of the map
* Two meteors from the same radiant, nearly at the same time
and with the same angle; I call such meteors "twins",
happens quite often with Perseids, at least that's what it
seems to me.
~ not so sure wheather this is really a NIA
+ didn't note the velocity, looks like an Aquarid, but too
far in the west
velocity scale:
1 - very slow; 2 - slow; 3 - medium; 4 - fast; 5 - very fast
Comments: Nice night, maybe this was my best Perseid
observation this year, if moon causes too much trouble.
Please note: d = degrees
----------
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