Almodôvar, Algarve, Portugal
| Visual 16/17 | Marco Langbroek, Almodôvar, Portugal |
| Visual 17/18 | Marco Langbroek, Almodôvar, Portugal |
| Visual 17/18 | Koen Miskotte, Almodôvar, Portugal |
| Visual 16-18 | Carl Johannink, Almodôvar, Portugal |
| Visual 16-18 | Marco Langbroek, Almodôvar, Portugal |
by Marco Langbroek, Almodôvar, Algarve, Portugal
DMS-members Koen Miskotte, Carl Johannink and Marco Langbroek observing the Leonids 2000
Hi,
Below a table with my Leonid data from the night of November 16-17, obtained
while observing under excellent conditions from Almodôvar in southern
Portugal. In total, 2.52h effective yielded 65 Leonids. Rates were already
slightly enhanced, (average ZHR ~25), especially during the last part of the
session, with rates slightly rising from ~1.5 to ~2 times the normal annual
values. My magnitude estimates yield an r-value of 3.0 for this period
(compare to 2.5 the next night).
We focussed on the last hours of the night because we first took some
sleep -on Wednesday 15 November we decided to book a last-minute flight from
the Netherlands to Portugal for November 16, so we spent the larger part of
the day of the 16th travelling by aircraft and then by car.
- Marco Langbroek (DMS)
Obs.: Marco Langbroek (LANMA) Loc.: Almodôvar, Portugal, 37d 31' N, 8d 00' W Date: November 16-17, 2000 UT Teff Lm Leo Tau Spo 3:40-4:02 0.37 6.4 5 2 4 4:02-4:32 0.50 6.4 15 0 6 4:32-5:02 0.50 6.4 8 2 6 5:02-5:32 0.50 6.4 12 0 8 5:32-6:11 0.65 6.4 25 0 6 TOTAL 2.52 65 4 30 99 strm/mag -1 0 +1 +2 +3 +4 +5 Leonids 3 2 3 12 16 25 4 <2.95> Sporadics 0 1 0 3 12 12 2 <3.33> Taurids 0 0 1 2 1 0 0 <2.00> UTC ZHR ± 03:51 17 7 04:17 33 9 04:47 16 6 05:17 22 6 05:52 34 7
--- Marco Langbroek private: marcolan@stad.dsl.nl Leiden University work: m.langbroek@arch.leidenuniv.nl Faculty of Archaeology website: http://homes.dsl.nl/~marcolan P.O. Box 9515 NL-2300 RA Leiden The Netherlands
by Marco Langbroek, Almodôvar, Algarve, Portugal
DMS-members Koen Miskotte, Carl Johannink and Marco Langbroek observing the Leonids 2000
Hi,
A quick note: we (Koen Miskotte, Carl Johannink and me) just returned from a last-minute campaign to southern Portugal (we decided to book a last minute flight for Nov.16-19 on the afternoon of November 15 because of very bad weather in the Netherlands).
Observing at Almodôvar (~75 km north of Faro) we witnessed an impressive show on November 17-18. I do not have real data available yet (hope to supply those in due time...), but we observed from ~1:30 UT to ~6 UT and continuously had rates well into the multiple meteors per minute (from 2-3 up to 7-8/minute), even when the radiant still was quite low in the sky, with Lm's at around +6.3 for me personally (notwithstanding moonlight!!) and very clear sky. Our field impression, and this seems to be backed by a look at some very preliminary raw data from one of us (JOHCA), is that there were TWO distinct peaks this night, one close to 2UT and a second near 3:30 UT. Please note: this is only an impression from the field and I am not (yet) possible to substantiate it with data.
Many bright meteors this night including several sub-zero events, and 3 major fireballs (a -6 and two -8's) with long persistent trains (one up to 10 minutes). In the list of my Leonid experiences from 1995 onwards this night ranks 3th best in impressiveness, after the 1999 storm and 1998 fireball component.
The nigh before, 16-17, we observed from ~2:30 to ~6 UT. Although modest, rates were definitely ENHANCED during the last 3 hours and at least twice as high as normal annual Leonid activity. To me, it was quite similar to the 1995 enhancement in outlook.
Below a table with my data from the night of November 17-18. We had very good conditions in Portugal, I am amazed about the limiting magnitude considering the moonlight! (note the effect of climbing moon). The 'tric' we did was that we used a low wall surrounding the little chapel to block the moon from vision during most part of the night. The secluded observing site and clear sky conditions did the rest.
My highest one-minute counts were 6-9 Leonids per minute short before 3:30 UTC
There appear to be at least two maxima in the profile; one first between 2:00- 2:15 UTC with ZHR ~240. Then rates decline notably to ~160 near 2:45 UTC. They rise again to a second maximum around 3:30 UTC with ZHR ~270. During the last hour, rates rise again, probably the onset of the peak over the States some 2 hours later. Please note that all quoted rate values are very preliminary.
Data from November 16-17 will follow later.
- Marco Langbroek (DMS)
Observer: Marco Langbroek (LANMA) Location: Almodôvar, Portugal, 37d 31' N, 8d 00' W Date : 17-18 November, 2000 UT Teff Lm Leo Tau Spo 1:29-1:45 0.20 6.6 12 1 3 1:45-2:00 0.25 6.6 22 0 1 2:00-2:15 0.25 6.5 29 2 7 2:15-2:30 0.25 6.5 24 1 2 2:30-2:45 0.23 6.4 29 1 1 2:45-3:00 0.25 6.4 24 1 1 3:00-3:14 0.23 6.4 39 1 0 3:17-3:30 0.22 6.4 46 2 1 3:30-3:44 0.23 6.4 46 0 5 3:45-4:00 0.23 6.4 33 1 4 4:00-4:15 0.20 6.4 31 1 2 4:45-5:00 0.25 6.4 37 0 2 5:00-5:15 0.25 6.2 35 0 2 5:15-5:30 0.25 6.2 39 0 4 5:30-5:45 0.25 5.9 35 0 5 (5:45-5:54 0.15 var 26 0 2) TOTAL 3.69 507 11 42 560 stream -8 -7 // -2 -1 0 +1 +2 +3 +4 +5 Leo 1 1 6 17 19 44 100 148 121 50 <2.72> Spo 1 4 10 21 6 <3.64> Tau 1 4 5 0 1 <1.73>
UTC ZHR ± 01:36 165 47 01:52 202 43 02:07 250 46 02:22 181 37 02:37 231 43 02:52 158 32 03:07 254 41 03:24 287 42 03:37 254 38 03:52 170 30 04:07 173 31 04:52 144 24 05:07 157 26 05:22 170 27 05:37 195 33
--- Marco Langbroek private: marcolan@stad.dsl.nl Leiden University work: m.langbroek@arch.leidenuniv.nl Faculty of Archaeology website: http://homes.dsl.nl/~marcolan P.O. Box 9515 NL-2300 RA Leiden The Netherlands
by Carl Johannink, Almodôvar, Algarve, Portugal
DMS-members Koen Miskotte, Carl Johannink and Marco Langbroek observing the Leonids 2000
Observer: Johannink , Carl (IMO-code JOHCA)
Location: Almodôvar, Portugal, lat. 37 40' North / lon. 7 55' West
Nov. 16/17 start 03:35 UT / end 06:02 UT ; Teff = 2,45 hours ; centre at alfa 5h ; decl. 60 degrees (04:40 UT)
Nov. 17/18 start 01:17 UT / end 05:54 UT ; Teff = 4,48 hours ; centre at alfa 3h ; decl. 45 degrees (01:35 UT)
15 min. - interval with highest Leo-counts: 03:19 - 03:34 UT (43) (40 or higher in the intervals 03:17 - 03:36 UT)
10 min. - interval with highest Leo-counts: 03:24 - 03:34 UT (29)
5 min. - interval with highest Leo-counts: 03:27 - 03:32 UT (17) (15 or higher in the intervals 03:27 - 03:35 UT)
Uncorrected for Radiant elevation
by Koen Miskotte, Almodôvar, Algarve, Portugal
DMS-members Koen Miskotte, Carl Johannink and Marco Langbroek observing the Leonids 2000
Observer: Koen Miskotte, IMO code MISKO
Location: Almodôvar, Portugal, lat. 37 40' North / lon. 7 55' West
Date Start End Teff N meteors Observing direction 17-11-2000 03:35:00 06:11:00 02:55 98 NW 50 degrees high 18-11-2000 01:18:00 05:54:00 04:44 694 NW 50 degrees high
Uncorrected for Radiant elevation
