Video observations of Hans Betlem, Klaas Jobse and Casper ter Kuile
 1. Carl Johannink (16/17 ; 17/18 ; 18/19 ; 19/20) |
| 2. Koen Miskotte (15/16 ; 16/17 ; 17/18 ; 18/19 ; 19/20) |
| 3. Marco Langbroek (16/17 ; 17/18 ; 19/20) |
| 4. Image Intensified Video (17/18 ; 18/19 ; 19/20) |
Date : 16/17-10-99
Observer: Johannink, Carl (IMO-code: JOHCA)
Place : Gronau (Germany)
Coord. : 07o 01'E ; 52o13'N
Center : R.A.=04h; Decl.=65 deg. at 02:00 UT
Start : 01:30 UT
End : 04:00 UT
Teff : 2.50 hours (recording; no plotting)
Time(UT) Ori Tau spor n LM Notes
01:30-02:30 3 2 10 15 5.7
02:30-03:15 4 0 10 14 5.7 0.75hours
03:15-04:00 3 1 10 14 5.6 0.75hours
<-2 2 1 0 1 2 3 4 5 6 m n Ori 0 0 0 0 0 2 3 5 0 0 3.30 10 Tau 0 0 0 0 0 1 1 1 0 0 3.00 3 spor 0 0 0 0 2 3 8 10 7 0 3.57 30
Date : 17/18-10-99
Observer: Johannink, Carl (IMO-code: JOHCA)
Place : Gronau (Germany)
Coord. : 07o 01'E ; 52o13'N
Center : R.A.=04h; Decl.=65 deg. at 02:00 UT
Start : 01:30 UT
End : 03:30 UT
Teff : 2.00 hours (recording; no plotting)
Time(UT): Ori: Tau: Lmi: Ege: spor: n: LM: Notes:
01:30-02:30 5 0 0 0 13 18 5.9
02:30-03:30 4 1 1 1 9 16 5.7
<-2 2 1 0 1 2 3 4 5 6 m: n: Ori 0 0 1 1 0 1 2 3 1 0 2.67 9 Tau 0 0 0 0 0 0 0 1 0 0 4.00 1 Ege 0 0 0 0 0 0 0 1 0 0 4.00 1 Lmi 0 0 0 0 1 0 0 0 0 0 1.00 1 spor 0 0 0 0 0 1 3 10 8 0 4.14 22
Date : 18/19-10-99
Observer: Johannink, Carl (IMO-code: JOHCA)
Place : Gronau (Germany)
Coord. : 07o 01'E ; 52o13'N
Center : R.A.=05h; Decl.=65 deg. at 03:00 UT
Start : 02:25 UT
End : 04:30 UT
Teff : 2.08 hours (recording; no plotting)
Time(UT): Ori: Tau: Lmi: Ege: spor: n: LM: Notes:
02:25-03:30 9 2 0 1 8 20 5.9 1.08 hour
03:30-04:30 5 1 1 0 11 18 5.7
<-2 2 1 0 1 2 3 4 5 6 m: n: Ori 0 0 0 1 1 5 3 3 1 0 2.64 14 Tau 0 0 0 0 0 0 1 2 0 0 3.67 3 Ege 0 0 0 0 0 0 0 1 0 0 4.00 1 Lmi 0 0 0 0 0 1 0 0 0 0 2.00 1 spor 0 0 0 0 0 0 6 9 4 0 3.89 19
Date : 19/20-10-99
Observer: Johannink, Carl (IMO-code: JOHCA)
Place : Gronau (Germany)
Coord. : 07o 01'E ; 52o13'N
Center : R.A.=05h; Decl.=65 deg. at 03:00 UT
Start : 02:20 UT
End : 04:30 UT
Teff : 2.16 hours (recording; no plotting)
Time(UT): Ori: Tau: Lmi: Ege: spor: n: LM: Notes:
02:20-03:30 9 2 0 0 9 20 5.9 1.16 hour
03:30-04:30 9 1 0 0 11 21 5.8
<-2 2 1 0 1 2 3 4 5 6 m: n: Ori 0 0 0 1 2 2 4 6 3 0 3.17 18 Tau 0 0 0 0 0 0 1 1 1 0 4.00 3 spor 0 0 0 0 0 1 4 10 5 0 3.95 20 C.F. Johannink Schiefestrasse 36 48599 Gronau Germany Phone: + 49 2562 22345 Email: cjohannink@netside.de
Date : 15-16 october 1999. Observer : Koen Miskotte (KMH/MISKO) Place : Ermelo Coordinaten : 5,4 East, 52,2 North Center : RA 5h, Decl. +25 at 3 UT. Start : 22:50 UT End : 02:06 UT Teff : 3,27 hours (No plotting, recording) Time UT Ori Tau eGem LMi Spor Total Lm Teff. Notes 22:50-00:00 2 3 0 0 11 16 6,3 1,17 00:00-01:00 3 3 0 0 11 17 6,3 1,00 01:00-02:05 5 2 1 0 10 18 6,3 1,08 Magnitude -2 -1 0 1 2 3 4 5 Tot. m Orionids 1 1 2 4 2 10 3,20 Taurids 4 4 8 4,00 eps. Geminids 1 1 5,00 Sporadics 1 2 3 8 12 6 32 3,44
Date : 16/17 October 1999 Observer : Koen Miskotte (KMH/MISKO) Place : Ermelo Coordinates : 5,4 east, 52,2 north Center : RA 5h, Decl. +25 (3 UT) Start : 0:15 UT End : 1:08 UT Teff. : 0,83 h (no plotting, recording) Time UT Ori Tau eGem LMi Spor Total Lm Teff. Notes 00:15-01:08 3 1 0 0 7 11 6,3 0,83 Magnitude -2 -1 0 1 2 3 4 5 Tot. m Orionids 1 2 3 2,67 Taurids 1 1 3,00 Sporadics 3 3 1 7 3,71
Date : 17/18 october 1999 Observer : Koen Miskotte (KMH/MISKO) Place : Ermelo Coordinates : 5,4 east, 52,2 north Center : RA 5h, Decl. +25 Start : 22:30 UT End : 3:15 UT Teff. : 4,75 h (no plotting, recording) Time UT Ori Tau eGem LMi Spor Total Lm Teff. Notes 22:30-23:30 3 1 0 0 10 14 6,4 1,00 23:30-00:30 1 3 0 0 8 12 6,4 1,00 00:30-01:30 2 3 1 0 11 17 6,4 1,00 01:30-02:30 9 3 2 1 12 27 6,4 1,00 02:30-03:15 6 2 0 1 12 21 6,4 0,75 Magnitude -2 -1 0 1 2 3 4 5 Tot m Orionids 1 1 1 7 6 5 21 3,38 Taurids 1 4 2 5 12 3,67 eGeminids 1 1 2 1,50 Leo Minorids 2 2 3,00 Sporadics 6 15 20 12 53 3,72
Date : 18/19 october 1999 Observer : Koen Miskotte (KMH/MISKO) Place : Ermelo Coordinates : 5,4 east, 52,2 north Center : RA 5 h, Decl. +25 Start : 0:20 UT End : 3:16 UT Teff. : 2,93 h (no plotting, recording) Time UT Ori Tau eGem LMi Spor Total Lm Teff. Notes 00:20-01:20 5 1 0 0 8 14 6,4 1,00 01:20-02:20 8 2 1 0 10 21 6,4 1,00 02:20-03:16 7 3 1 1 11 23 6,4 0,93 Magnitude -2 -1 0 1 2 3 4 5 Total m Orionids 1 2 7 6 4 20 3,40 Taurids 1 3 2 6 3,83 eGeminids 1 1 2 4,50 Leo Minorids 1 1 3,00 Sporadics 2 9 12 6 29 3,76
Date : 19/20 october 1999 Observer : Koen Miskotte (KMH/MISKO) Place : Ermelo Coordinates : 5,4 east, 52,2 north Center : RA 5h, Decl. + 25 (3 UT) Start : 0:23 UT End : 3:12 UT Teff. : 2,82 h (no plotting, recording) Time UT Ori Tau eGem LMi Spor Total Lm Teff Notes 00:23-01:25 7 1 0 2 6 16 6,3 1,03 01:25-02:25 8 1 0 0 7 16 6,3 1,00 02:25-03:12 9 3 1 0 8 21 6,3 0,79 Magnitude -2 -1 0 1 2 3 4 5 Total m Orionids 1 1 3 5 8 6 24 3,42 Taurids 1 2 1 1 5 3,40 eGeminids 1 1 4,00 Leo Minorids 1 1 2,50 Sporadics 1 1 5 9 5 21 3,76
What a beatifull night this was!
Due to a high above Scandinavia and a continental wind, the skies here have turned extremely clear and the air very dry. So, ideal conditions to go for a hunt targetting early Orionids. A table with data is at the end of this mail.
I started at 0:55 UT (2:55 local time) and to my excitement counted a Lm of +6.5 in both Taurus and Pegasus and even +6.6 in Perseus; in 20 years of observing from Voorschoten, I've seldom had such a deep limiting magnitude! Later this night, Lm slightly (but only slightly) dropped to +6.4, still extremely good for my location. The sky was star-spangled, the air tranquile and dry. Orion and Taurus and the winter milky way stood out very well, I could count 11 stars in the Pleiades easily. Temperatures were at 4 degrees Celsius, I reckon it must have been zero at toe-level. And in accordance with the good Lm, meteor rates were very good. In 3.10 hours effective, I observed a total of 62 meteors, of which 12 were Orionids. All meteors have been plotted. Some nice and occasionally bright sporadics appeared (to name some of the best; fast yellow mag. 0 at 1:02 in -damned be the thing!- the Pegasus square; mediumfast mag. 0 at 2:46 in Auriga; fast mag. +1 with short persistent train at 3:51 in Auriga; fast mag. 0 at 4:13 on the Aur-Gem border). Thus, I enjoyed a very satisfying night. Orionids were modestly active and well recognizable, but no particularly bright ones appeared (best one a +2 with 1 sec persistent train at 2:55 in Aries). The first appeared 13 minutes after I started.
My data result in a Orionid ZHR of 5 +- 1; theoretically it should be around 6 (P. Jenniskens, A&A 287 (1994), 990-1013), so isn't that nice?!! There was a low Taurid activity, not particularly attractive although a nice long yellow mag. 0 appeared in Andromeda at 1:28. My data result in a overall Taurid ZHR of 2 +- 1 (theoretically it should be 2 -how nice again!). I also had two possible epsilon Geminids (although according to Marc's video data the stream might not exist), and one early Leo minorid.
At 4:35 UT (6:35 local time) I stopped, because twilight was approaching, fatigue came down upon me and I noted that my mind started to wander from meteors to other attractive things (Lauren in Cairo). This was one of the most enjoyable nights I experienced lately. Since the good weather continues, I think I will be out again coming night, to see whether the Orionids are gradually catching on in activity.
Table with data below.
Marco Langbroek
Dutch Meteor Society, the Netherlands
Obs.: Marco Langbroek LANMA
Date: 16-17 October 1999
Loc.: Voorschoten, the Netherlands, 52d 07' N, 4d 28' E
UT Teff Lm Ori Tau eGem Lmi Spo total Ori ZHR
0:55-2:00 0.98 6.5 3 5 0 1 10 19 4+-2
2:00-3:00 0.88 6.4 6 1 0 0 11 18 8+-3
3:12-4:35 1.25 6.4 3 0 2 0 20 25 3+-2
TOTAL 3.10 <6.4> 12 6 2 1 41 62 5+-1
strm/mag. 0 +1 +2 +3 +4 +5
Sporadics 3 2 5 17 7 7 3.1
Orionids 0 0 1 2 6 3 3.8
Taurids 1 0 1 1 1 2 3.2
e Geminids 0 0 0 1 1 0 3.5
Leo minorids 0 0 0 0 1 0
Last night again was such a beatifull clear night. Below a table with my data.
I counted a Lm of +6.3, very good indeed! Activity was therefore accordingly good, in 1.72 hours effective between 2:00 and 4:00 UT (4:00-6:00 local time) I observed 47 meteors. Of these, 11 were Orionids. My data results in a Orionid ZHR of 8 +- 2; theoretically, it should be 8 (P. Jenniskens: A&A 287 (1994), 990-1013), so the stream is right on schedule it seems. No particularly attractive meteors though -the best was a +1 yellow Taurid at 2:32 UT in southern Perseus. Best Orionids were a +2 in Aries at 3:09 UT and another +2 on the Orion-Monoceros border at 3:34 UT. I also noted 2 (out of 3 in total) +2 Leo minorids both with a distinct greenish color. All meteors have been plotted on a gnomonic map.
With 4 degrees C temperature was similar to yesterday night, but there now was an additional chilling wind which made it less pleasant. At ground level it has been freezing, since I heard an early car-owner scraping the ice from his windscreen when I stopped. I kept this night restricted to 2 hours because I have some things to do these days for which I need a clear mind and thus some sleep.
Table with data below.
Marco Langbroek
Dutch Meteor Society
Obs: Marco Langbroek LANMA Date: 17-18 October 1999 Loc: Voorschoten, the Netherlands, 52d 07'N, 4d 28'E UT Teff Lm Ori Tau eGem Lmi Spo total Ori ZHR 2:00-3:00 0.87 6.3 4 2 2 2 11 21 6+-3 3:00-4:00 0.85 6.3 7 2 1 1 15 26 10+-4 TOTAL 1.72 6.3 11 4 3 3 26 47 8+-2 strm/mag. 0 +1 +2 +3 +4 +5Sporadics 0 0 4 12 5 5 3.42 Orionids 0 0 2 3 5 1 3.45 Taurids 0 1 0 0 3 0 3.25 e Geminids 0 0 0 1 2 0 3.67 Leo minorids 0 0 2 0 0 1 3.00
The Orionids made a great performance last night, especially the last observational hour was pretty cool! Below is a table with my data. I observed a mere 2 hours (1.69 effective) from moonset till dawn, and noted 66 meteors of which 31 were Orionids. During the last hour rates were a little bit on the high side (my data for this hour give a ZHR of 38+-9, but I think it is a statistical 'hickup' only due to the appearance of a bunch of Ori's near 3:55 UT; 5 in just 5 minutes! My overall ZHR for this night comes at 28.5+-5, again slightly on the high side but that is due to that last hour. The first hour has a calculated ZHR that is normal, 18+-5). All meteors were plotted on gnomonic maps.
Sky conditions were good although not as excellent as previous nights; there was a slight touch of haze, and some moving streaks of cirrus during the first 40 minutes. During the last 40 minutes, some early KLM birds made themselves a nuisance.
Most marvelous meteor of this night was a yellow -1 Orionid (4:09) with 1 sec persistent train that appeared as a semi-point meteor very close to the radiant! A fast yellowish -1 sporadic appeared near to Capella at 3:25 and had a short 'wake'. I had a bunch of nice +1 and +2 Orionids as well, some with trains. Sorry Marc, but I continue to see epsilon Geminids; 5 this night. Taurid activity is very dull, although I had a nice yellow +2 at 3:03.
Well, this was a very good night indeed! I am not sure if I am able to observe coming night, since I have to give a talk to some amateur archaeologists about flintworking tonight, and weather prospects predict clouds coming in later this day. I skipped last monday night too, since I had a social event which included emptying a bottle of fine Californian wine, which ruins your observations (no, you don't start to see double meteors; in 1993 at the Cagny excavation in France I determined empirically, my dear friends, that 3 glasses of wine make your brightness estimates tip off scale; my sporadics that night had a mean magnitude of +1.8, oops!).
Table with my data from last night is below.
Cheers!
Marco Langbroek
(Dutch Meteor Society)
Date: 19-20 October 1999 Obs.: Marco Langbroek LANMA Loc.: Voorschoten, the Netherlands, 52d 07'N, 4d 28'E UT 2:35-3:40 0.92 6.2 12 1 1 1 15 30 18+-5 3:40-4:40 0.77 6.1 19 2 4 2 9 36 38+-9 TOTAL 1.69 6.2 31 3 5 3 24 66 28+-5 strm/mag. -1 0 +1 +2 +3 +4 +5Sporadics 1 0 0 4 10 4 5 3.25 Orionids 1 0 3 5 9 9 4 3.10 Taurids 0 0 0 1 0 2 0 3.33 e Geminids 0 0 0 1 3 1 0 3.00 Leo minorids 0 0 0 0 1 2 0 3.67
Observers:
- Hans Betlem, Leiden
- Klaas Jobse, Oostkapelle
- Casper ter Kuile, De Bilt
Observation periods:
- 17/18 October : 1h30m - 4h36m UT
- 18/19 October : 1h52m - 5h00m UT
- 19/20 October : 1h21m - 4h30m UT
