MAKISIMA LIBRARY

Astronomy

The Leonids on Nov. 19, 2001

November from 18th to 19th, 2001.

I counted up 1126 meteors, though an irresponsible way of counting. It was an highest scale of meteor stream I have ever seen. As about a few hundreds of shooting stars at most through a night in the normal year, I counted them without breaks in the beginning.

It was cloudy the night before the day and the early evening of the day, but it was clear through the night.

I think stars of the third or fourth magnitude can be seen at Kitamoto, Saitama. I tried 15 minutes fixed exposures, but they were out of focus in the beginning, and after that, the lens got wet with the evening dew, then, few photographs were successful. I got six shooting stars in a roll of 24 exposure film.

Number of meteors I observed
Period of time Number Number/min. Note
about 23:00 - 1:451000.61 Too numerous to count up through.
- 2:00302.0
- 2:15624.1
- 2:30775.1
- 2:45815.4
- 3:001026.8
- 3:151107.3
- 3:3016611.1
- 3:451026.8
3:50 - 4:00666.6 Used the bathroom.
- 4:15684.5
4:25 - 4:30295.8 Found the lens fogged.
4:37 - 4:45425.3 Lens was fogged.
4:50 - 5:00282.8
- 5:15513.4
- 5:27121.0 Twilight began.
Total about 6.5 hours1126

Meteor trails, fireballs (no records of the time and numbers). Shooting stars had length from 0 degrees to 45 degrees or might have more. Generally those nearer to Leo are shorter, farther are longer. Duration are from a flash to long enough to make a wish. Some meteor trails remained a few minutes, gradually snaking and becoming dim. I think most shooting stars are in the Leonids, because they radiated from Leo. As a parking space of Saitama-Kenmin-no-Mori, Saitama prefectural forest park, where I often go to see stars, is cut off the eastern view, I did not have recognized they radiate. Meteors tend to shoot continuously. When I caught sight of something shooting in an edge of my eyes, I often watch others in the direction. They sometimes falled four or five ways at a time. I could witness meteors at everywhere I see around when the Leonids were most active. I guess they shot one per a few seconds.

NHK news reported that the stream peak was about 3:20 a.m. and meteors were observed at the rate of 5000 an hour in the place on good condition.

Photograph

Leonids ( in the direction of Leo ) enlarge
There are two shooting stars at the right and at the lower right of the photograph. Leo is looking up at the middle of it.

Update: 2001.12.29
Copyright (C) 2001, MAKISIMA Noriyuki (http://www.makisima.org/mailform/) (http://www.makisima.org/)