Leonid Page Numazawa & JPLinc.

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1998 A result of Leonid

We, members of Murakami Amateur Astronomy Association and Japan Planetarium Lab. Inc. staff, observed Leonid at Akagi Mountain of Gumma Prefecture in Japan.
Our member are Y.Itagaki, F.Ito, T.Sawado, T.Matsuta, T.Murohasi of Murakami Amateur Astronomy Association; Shigemi Numazawa and Nanayo Wakiya of Japan Planetarium Lab..
At all times, 4 members gazed at the sky.

We started our observation at 23h local time (17 Nov. 14h Universal Time).
During 14:00-15:00UT, we counted 16 Leonid meteors and 20% of them are brighter than -2 magnitude.
Then, though the number of Leonid meteors increased, all of us felt the peak time had already past.
In a hour from 18:00UT to 19:00UT, it was a maximum that we caught 67 Leonid per hour. The ratio of very bright meteor, that is one brighter than -2, decreased to 10%.
From around 19:00UT, the cloud began to float the sky and covered all sky until about 20:00UT.
Then the dawn had come, so we finished observation.

We have observed meteor shower for more than 20 years.
But it was first experience to look so many fireballs as this Leonid.
Meteor rate was less than the peak time of Perseid or Geminid.
But at 18:38UT, we counted 7 Leonid for just one minute.

The result of naked eye observation

1998.11.17 UT

member: Y.Itagaki, F.Ito, T.Sawado, T.Matsuta, T.Murohasi, S.Numazawa, N.Wakiya(Murakami Astronomical Association & Japan Planetarium Lab.)

observer:4people recorder:2people

Location: Mt. Akagi, Gumma JAPAN 139*06'45"E 36*35'33"N Alt. 835m

h(UT)

min

A-group

B-grout

count/10min.

HR count/1h

Cloud-X/10

Limit of Mag.

13

50-00

0

0

0

-

1

6

14

0-10

0

0

0

-

0

6

-

10-20

1

0

1

-

0

6

-

20-30

1

0

1

-

0

6

-

30-40

3

0

3

-

0

6

-

40-50

4

0

4

-

0

6

-

50-00

7

0

7

16

0

6

15

0-10

2

0

2

-

0

6

-

10-20

5

0

5

-

0

6

-

20-30

7

0

7

-

0

6

-

30-40

4

0

4

-

0

6

-

40-50

7

0

7

-

0

6

-

50-00

4

0

4

29

0

6

16

0-10

5

0

5

-

0

6

-

10-20

8

0

8

-

0

6

-

20-30

10

0

10

-

0

6

-

30-40

10

0

10

-

0

6

-

40-50

5

0

5

-

0

6

-

50-00

8

0

8

46

0

6

17

0-10

7

0

7

-

0

6

-

10-20

9

0

9

-

0

6

-

20-30

6

5

11

-

0

6

-

30-40

6

1

7

-

2

6

-

40-50

5

1

6

-

2

6

-

50-00

0

4

4

44

2

6

18

0-10

2

9

11

-

2

6

-

10-20

2

2

4

-

2

6

-

20-30

0

4

4

-

2

6

-

30-40

0

23

23

-

2

6

-

40-50

0

11

11

-

3

6

-

50-00

6

8

14

67

6

6

19

0-10

1

6

7

-

7

6

-

10-20

2

5

7

-

7

5.5

-

20-30

3

2

5

-

7

4.5

-

30-40

3

7

10

-

6

5.5

-

40-50

7

2

9

-

8

4.5

-

50-00

0

0

0

38

10

2

Outburst period

h(UT)

min

count

18

35

3

-

36

5

-

37

1

-

38

7

-

39

3

-

40

2

-

41

1

-

42

2

CHR, ZHR

day

ÇiÇrÇs

ÇtÇs

obs.time

total

leonid

other

mag.-lim

cloud

observer

recorder

F-people

Fa

x

Rad.H

Fb

HR

ÇbÇgÇq

CHR(cloud)

ZHR

ZHR/P

17

23:00:00~

14:00:00~

60

-

16

-

6

0

4

2

0.35

1.6

1.0

0

-

16

25.6

25.6

-

-

17

24:00:00~

15:00:00~

60

-

29

-

6

0

4

2

0.35

1.6

1.0

13

9.4

29

46.4

46.4

436.16

151.972

17

25:00:00~

16:00:00~

60

-

46

-

6

0

4

2

0.35

1.6

1.0

24

3.9

46

73.6

73.6

287.04

100.014

17

26:00:00~

17:00:00~

60

-

44

-

6

0

4

2

0.35

1.6

1.0

37

2.1

44

70.4

70.4

147.84

51.512

17

27:00:00~

18:00:00~

60

-

67

-

6

2.8

4

2

0.35

1.6

1.4

49

1.5

67

107.2

148.9

223.33

77.816

17

28:00:00~

19:00:00~

60

-

38

-

4.7

7.5

4

2

0.35

5.2

4.0

61

1.2

38

197.6

790.4

948.48

330.481

-

h:m:s

h:m:s

min.

-

-

-

mag.

x/10

people

people
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h(UT)	min	A-group	B-grout	count/10min.	HR count/1h	Cloud-X/10	Limit of Mag.
13	50-00	0	0	0	-	1	6
14	0-10	0	0	0	-	0	6
-	10-20	1	0	1	-	0	6
-	20-30	1	0	1	-	0	6
-	30-40	3	0	3	-	0	6
-	40-50	4	0	4	-	0	6
-	50-00	7	0	7	16	0	6
15	0-10	2	0	2	-	0	6
-	10-20	5	0	5	-	0	6
-	20-30	7	0	7	-	0	6
-	30-40	4	0	4	-	0	6
-	40-50	7	0	7	-	0	6
-	50-00	4	0	4	29	0	6
16	0-10	5	0	5	-	0	6
-	10-20	8	0	8	-	0	6
-	20-30	10	0	10	-	0	6
-	30-40	10	0	10	-	0	6
-	40-50	5	0	5	-	0	6
-	50-00	8	0	8	46	0	6
17	0-10	7	0	7	-	0	6
-	10-20	9	0	9	-	0	6
-	20-30	6	5	11	-	0	6
-	30-40	6	1	7	-	2	6
-	40-50	5	1	6	-	2	6
-	50-00	0	4	4	44	2	6
18	0-10	2	9	11	-	2	6
-	10-20	2	2	4	-	2	6
-	20-30	0	4	4	-	2	6
-	30-40	0	23	23	-	2	6
-	40-50	0	11	11	-	3	6
-	50-00	6	8	14	67	6	6
19	0-10	1	6	7	-	7	6
-	10-20	2	5	7	-	7	5.5
-	20-30	3	2	5	-	7	4.5
-	30-40	3	7	10	-	6	5.5
-	40-50	7	2	9	-	8	4.5
-	50-00	0	0	0	38	10	2

day	ÇiÇrÇs	ÇtÇs	obs.time	total	leonid	other	mag.-lim	cloud	observer	recorder	F-people	Fa	x	Rad.H	Fb	HR	ÇbÇgÇq	CHR(cloud)	ZHR	ZHR/P
17	23:00:00~	14:00:00~	60	-	16	-	6	0	4	2	0.35	1.6	1.0	0	-	16	25.6	25.6	-	-
17	24:00:00~	15:00:00~	60	-	29	-	6	0	4	2	0.35	1.6	1.0	13	9.4	29	46.4	46.4	436.16	151.972
17	25:00:00~	16:00:00~	60	-	46	-	6	0	4	2	0.35	1.6	1.0	24	3.9	46	73.6	73.6	287.04	100.014
17	26:00:00~	17:00:00~	60	-	44	-	6	0	4	2	0.35	1.6	1.0	37	2.1	44	70.4	70.4	147.84	51.512
17	27:00:00~	18:00:00~	60	-	67	-	6	2.8	4	2	0.35	1.6	1.4	49	1.5	67	107.2	148.9	223.33	77.816
17	28:00:00~	19:00:00~	60	-	38	-	4.7	7.5	4	2	0.35	5.2	4.0	61	1.2	38	197.6	790.4	948.48	330.481
-	h:m:s	h:m:s	min.	-	-	-	mag.	x/10	people	people	-	-	-	-	-	-	-	-	-	-

Illustration	Astronomical Photographs	Japan Planetarium Lab. inc.
Kamihayashi Obs.	Niigata account of a journey	Comet Hale Bopp & New Comet
Comet Hyakutake	-	-