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(meteorobs) Catching the last Gem - Observation 17/12/2003



Day:17 Month:12 Year:2003
Begin: 20h00m   End: 21h44m

Location  long. E9d26'25"  latit. N48d51'57"

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|veloc.|a.h|HR |eZHR|
|--------------------------*-------~--|
|.XOR.|..97d|.+23d|sl-med|43d|0.6|3.32|
|.MON.|.103d|.+08d|42km/s|28d|0.6|4.83|
|.GEM.|.112d|.+33d|42km/s|41d|0.6|3.46|
|.URS.|.217d|.+76d|33km/s|35d|0.0|0.00|
|.SPO.|.---.|.---.|.----.|.-.|1.8|.--.|
.-------------------------------------
these figures are taken from the current
AMS Meteor Activity Outlook by Robert Lunsford
* average radiant height (est.)
~ estimated with r=3.0, deltalm=0.0 and est. radiant height

Periods:
.-----------------------------------------------------------
|.Period....|Field....|Teff|.F.|.lm.|GEM|MON|URS|XOR|SPO|SPO|
|..(UT).....|RA..dot dec.|..h.|...|.m..|M|N|M|N|M|N|M|N|M|N|M|N|
|-----------------------------------------------------*-----|
|20:00-21:44|080d|+46d|1.66|1.0|5.29|P|1|P|1|P|0|P|1|C|1|P|2|
.-----------------------------------------------------------
* didn't plot due to uncertainity / large number of meteors
  at that time; might as well be shower meteors

Magnitude Distribution:
.-----------------------------------------------------.
|Shower.|.-3|.-2|.-1|..0|.+1|.+2|.+3|.+4|.+5|avg.|.tot|
|-------|---|---|---|---|---|---|---|---|---|----|----|
|.GEM...|...|...|...|...|...|1.0|...|...|...|2.00|..1.|
|.MON...|...|...|...|...|1.0|...|...|...|...|1.00|..1.|
|.XOR...|...|...|...|...|...|...|1.0|...|...|3.00|..1.|
|.SPO...|...|0.5|0.5|0.5|0.5|...|0.5|0.5|...|0.83|..3.|
.-----------------------------------------------------.

Train Distribution:
.-----------------------------.
|dur.|5s|4s|3s|2s|1s|<*|no|tot|
|----|--|--|--|--|--|--|--|---|
|GEM.|..|..|..|..|..|..|.1|.1.|
|MON.|..|..|..|..|..|..|.1|.1.|
|XOR.|..|..|..|..|..|..|.1|.1.|
|SPO.|..|..|..|..|..|.1|.2|.3.|
.-----------------------------.
 * 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|
|---|-----|----|---|---|-----|----|----|----|----|---|---|
|512|20:00|.0.5|1-2|SPO|.<1s.|.158|.155|.237|.220|.4.|.1.|
|513|20:30|.3.0|.4.|XOR|..-..|.250|.197|.186|.208|.2.|.2.|+
|514|20:38|.1.0|3-4|MON|..-..|..84|.155|.122|.133|.1.|.3.|*
|515|20:48|.3.5|.4.|SPO|..-..|.--.|.--.|.--.|.--.|.-.|.-.|
|516|20:55|.2.0|.3.|GEM|..-..|..83|.131|.125|..99|.1.|.3.|~
|517|21:18|-1.5|.4.|SPO|..-..|.115|..91|.302|.289|.4.|.2.|
.--------------------------------------------------------.
enumeration starts in the 20/02/2003 session
all coordinates in mm from the lower left corner of the map
velocity scale:
1 - very slow; 2 - slow; 3 - medium; 4 - fast; 5 - very fast
+ over since 15/12 (officially), but the antihelion radiant
  can't really disapear, can it?
* lines up with XOR as well, but path lenght and the exact
  encounter with the MON radiant suggest this as its radiant
~ I finally caught one of the last "Gems" for this year

Comments: I'm on an IPhO preparation seminar this week, but
the full schedule didn't keep me from this winter night session
in the cold (not too bad, actually). One last Geminid, the
whole maximum period was clouded at my site, no Ursid activity
I could confirm yet, but looking forward to Christmas.
Activity was on the bright side, maybe I was a little tired
and missed the fainter ones (possible, at least today I'm
very tired and will not go out observing although the sky looks
wonderful).

Please note: d = degrees, all times in UT

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