by Sietse Dijkstra, Robert Haas, Casper ter Kuile, Koen Miskotte, Jos Nijland, Arnold Tukkers and Michel Vandeputte
Jin Zhu, Xiaojun Jiang, Bin Yang, Huan Meng, Dan Xia, Xuefei Gong, Haitao Chen, Min Guan, Wenzhong Liu, Jian Gao, Rui Qi, Yongming Chen
Michel Vandeputte (PUTMI), Koen Miskotte (MISKO), Arnold Tukkers (TUKAR), Jos Nijland (NIJJO), Dan Xia (XIADA), Jin Zhu (ZHUJI)
from Xinglong, PanShan and Miyun stations, NAOC, Hebei/Beijing, China
| Interval [UT] | PUTMI | MISKO | TUKAR | NIJJO | XIADA | ZHUJI |
|---|---|---|---|---|---|---|
| 14:00 - 15:00 | 0 | 2 | 1 | 0 | 0 | 0 |
| 15:00 - 16:00 | 31 | 37 | 54 | 0 | 18 | 21 |
| 16:00 - 17:00 | 210 | 215 | 207 | 0 | 99 | 0 |
| 17:00 - 18:00 | 726 | 924 | 756 | 468 | 493 | 0 |
| 18:00 - 19:00 | 1519 | 1335 | 1388 | 1126 | 777 | 635 |
| 19:00 - 20:00 | 931 | 735 | 435 | 492 | 310 | 0 |
| 20:00 - 21:00 | 493 | 504 | 407 | 0 | 55 | 0 |
| 21:00 - 22:00 | 264 | 327 | 226 | 125 | 0 | 0 |
| Total | 4174 | 4079 | 3474 | 2211 | 1752 | 656 |
The plot of Koen Miskotte is computed using:
- Lm (limiting Magnitude) = 6.6
- Cp (Perception Coefficient) = 1.2
- r (Population Index) = 2.58
- RH (Radiant Height) = 32 degrees
- Gamma = -1.0
- Total observing time = 360 minutes
- Total number of meteors = 4000
- BIN = Total observing time (min) / SQRT(total observed meteors : 360 / SQRT(4000) = 5 minutes
The plot of Arnold Tukkers is computed using:
- Lm (limiting Magnitude) = 6.6
- Cp (Perception Coefficient) = 1.2
- r (Population Index) = 2.58
- RH (Radiant Height) = 32 degrees
- Gamma = -1.0
- Total observing time = 360 minutes
- Total number of meteors = 4000
- BIN = Total observing time (min) / SQRT(total observed meteors : 360 / SQRT(4000) = 5 minutes
Observed by : Vandeputte Michel (IMO - VANMC) Attention : This list is based on my visual observations. 17 - 18/11/01 Post Pan Shan Observing window : 15.30 - 21.45 UT All times in UT. 16.35 Tau -4 Canis Minor - blue white - long trail - Mag -4 flare. 17.31 Spo -6 Average speed in Draco - short trail. 18.55 Leo -2 Long trail - Ursa Major to Ursa Minor - ~ : 2 s 19.00 Leo -4 Fireball - short train from Orion to Lepus - ~ : 4s. 20.00 Leo -3 Short trail - Ursa Major - ~ 18-19/11/01 Post Pan Shan Observing window : 15.25 - 21.55 UT 16.00 - 16.10 Leo -2 earth grazer with -2 flare - ~ . 16.03.58 Leo -6 earth grazer with 30 minutes persistent train of 20 degrees in Canis Major. For the visitors of the website of Robert haas ; This is the famous "go go go" earth grazer. See : http://delpsurf.www.cistron.nl/leo2001/photo6.htm 16.20 - 16.25 Leo -2 ~ 16.25 Leo -2 16.25 - 16.30 Leo -3 together with two magnitude +3 Leonids. 16.54.00 Leo -3 16.55 Leo -2 Ursa Major 16.57 Leo -4 Ursa Major 16.58 Leo -3 17.05 Leo -5 eastern horizon. 17.16 Leo -4 strong magnitude -4 flare at the end, exactly in M44 (Cancer) persistent train. 17.16 Leo -4 short trail in Leo 17.18 Leo -8 Ursa Major / ~ 17.22 Leo -4 Leo 17.27 Leo -3 17.29.24 Leo -8 Ursa Minor - 10 minutes (visual) persistent train. 17.39 Fireball Magnitude unknown 17.42.45 Leo -4 Hydra 17.46.10 Leo -4 Perseus - long transforming persistent train. 17.46.13 Leo -4 17.47.46 Leo -6 Ursa Major - beautiful transforming persistent train ( U-shape) 17.49.33 Leo -2 17.51.18 Leo -5 Ursa Minor - wide transforming persistent train. 17.52.09 Fireball Flash behind the mountains. 17.53.22 Leo -2 Orion - strong flare at the end - wide ~ 18.01.39 Leo -2 18.03.24 Leo -3 Ursa Minor. 18.04.38 Leo -4 18.10.36 Leo -5 Sextant. 18.14.20 Fireball Leonid activity has become to high now, to take time for brightness estimation. 18.14.25 Fireball 18.16.17 Fireball 18.16.45 Fireball 18.21.58 Fireball 18.23.09 Fireball Monceros. 18.24.10 Fireball From Gemini to Orion. 18.39.59 Fireball 18.41.06 Fireball Hydra. 18.42.40 Fireball From Ursa Minor to Draco. 18.46.05 Fireball 18.46.27 Fireball 18.51.54 Fireball 18.52.40 Fireball Ursa Major. 18.52.53 Fireball Ursa Major. 19.03.15 Fireball -3 ? 19.05.19 Fireball Canis Major. 19.05.55 Leo -10 Sextant. 19.17.08 Fireball Ursa Major. 19.21.57 Fireball 19.23.38 Leo -5 Sextant. 19.25.55 Fireball 19.25.59 Fireball 19.12.44 Leo -12 possible -15 ? In Leo - She really blinded me ! Even its train has a negative magnitude for a couple of seconds. After three minutes, the brightness was already decreased to Magnitude +5. 19.30.14 Fireball 19.31.13 Fireball 19.35.24 Fireball -3 ? 19.35.25 Fireball -3 ? 19.37 Fireball -3 ? 19.37.53 Fireball -3 ? 19.44.48 Fireball Bootes - eastward (behind the mountains). 19.50.28 Leo -8 possible -10 ? - Bootes. 19.55.01 Fireball Virgo. 19.55.43 Leo -3 Leo. 19.58.40 Leo -4 From Lepus to Eridanus. 19.59.23 Leo -3 20.03.27 Leo -2 20.05 Leo -5 Bootes. 20.07.38 Leo -2 20.09.45 Leo -3 20.09.45 Leo -6 Virgo. 20.10.53 Leo -2 20.17.19 Leo -2 Sextant / Crater. 20.17.28 Leo -2 Between Gemini and Orion - strong flare at the end. 20.31.06 Leo -2 Sextant - ~ . 20.31.08 Leo -7 From Ursa Minor to Ursa Major. - Wide persistent train. "S" shape in the beginning, and after a couple of minutes trans- forming into a "U". 20.31.22 Leo -6 Leo. 20.35.44 Leo -4 Between Canis Minor and Orion - transforming ~. 20.40.34 Leo -2 20.41.50 Leo -2 20.47.38 Leo -4 Close tot the radiant - short trail - green - little transforming persistent train. 20.51.47 Leo -5 Draco - ~ . 20.52.58 Leo -3 Virgo - ~ . 20.55.06 Leo -2 21.01.42 Leo -2 Bootes - ~ . 21.03.01 Leo -4 Close to the radiant in Leo - ~ . 21.11.05 Leo -2 From Leo to Corvus. 21.13.33 Leo -7 Ursa Minor - ~. 21.17.56 Leo -12 ? Cassiopeia. I only saw a part. - ~ . 21.22.36 Leo -4 northeast. 21.32 Leo -3 Bootes. 21.36 Leo -4 Orion - ~ - strong flare at the end. 21.44 Leo -3 Serpens Caput - Virgo. After 22 UT Fireball in full morning twilight ! 19 - 20/11/01 Post Pan Shan Observing window : 15.45 - 21.30 UT 16.54 Leo -2
Did we observed the 4-rev. trail or did we only observed the 9, 10 & 11 trails instead?
Question: did we missed the 4-rev. trail at all or is the density of material in this trial much less as predicted by Lyytinen?
Plot made by Marco Langbroek
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http://home.wanadoo.nl/marco.langbroek/leo2001.html
