同時流星観測報告(2004.08.11/12, 12/13)
Double-station TV meteor observations
Meteor Science Seminar Working Group (MSS-WG)
重野好彦 戸田雅之

１．はじめに
１９９６〜７年８月に同時ＴＶ観測を４日間行って以来、ペルセウス群から遠ざかっていたが、ＴＶと眼視の等級比較を行うため、広角レンズを使用して、久しぶりに観測を行った。表１にペルセウス群の輻射点と軌道要素の観測結果を示す。１９９６〜７年は主に８５ｍｍ対物レンズを使用しているが、２００４年は２４ｍｍ対物レンズであり、焦点距離が３．５倍違うため、測定精度も比例して落ちている。２００４年の結果を見ると輻射点位置は他の年の結果と変わらない。しかし速度が約１ｋｍ／ｓ遅い。これは誤差によるものと思われる。

Table 1. Radiants and Orbits of Perseid TV meteors.
Object lensDATE(UT)Y M D

85mmF1.4 (9.5dx7.5d) : 960811, 970812, 960812
50mmF1.2 (17dx13d) : 970811
24mmF1.4 (36dx29d) : 040811, 040812

S.Long Co.Rad SD 2000 SDdeg A.deg deg D.deg deg

VG SDkm/s km/s

aAUe
-q

19970811.752 139.133 47.67 .87 57.05 .36SD(+/-) .012.011.40 .78 -59.4 2.6
2.1 -12.3 0.923 0.941 148.2 139.1 114.1- .178 .006
3.2.01.2

111.5 99.5 3.4
3.9.9 1.5420040811.684 139.262 47.61 2.1 57.10 .59
SD(+/-) .076.073 1.31 .86 -58.4 2.8
1.4 -

7.35 0.872 0.941 147.9 139.3 113.7- .093 .015
4.0.1
1.2

113.6 98.9 2.2
8.3 3.4 1.5

2319960811.739 139.365 47.21 .44 57.81 .12
SD(+/-) .053
.050
.87 .61 -59.0 1.3
1.1 -

18.2 0.948 0.950 150.5 139.4 113.5- .076 .008
2.6.0
1.0

116.0 97.6 2.6
6.6 2.6 1.8

1019970812.660 140.005 47.19 .67 58.08 .27
SD(+/-) .064
.062 1.30 .60 -58.9 1.3
1.2 -

12.1 0.921 0.952 150.9 140.0 112.6- .092 .009
2.9.1
1.4

117.8 99.2 2.1
6.9 2.5 2.0

2320040812.678 140.217 48.42 1.6 57.70 .49
SD(+/-) .070
.067 1.30 .84 -58.8 2.2.9 -10.0 0.905 0.947 149.6 140.2 113.5- .072 .009
2.5.1
1.2

114.6 97.5 2.1
4.7 3.4 1.5

4319960812.691 140.278 47.97 .62 57.85 .18
SD(+/-) .059
.057 1.12 .63 -58.9 1.4
1.0 -

13.6 0.930 0.952 151.0 140.3 113.4- .063 .008
2.1.1
1.0

113.8 98.0 2.8
5.4 4.3 1.7

19AUPerideg

NODEdegideg

Hbkm

He Abs NOkm mag metFigure 1 6 days observations, 353 Corrected Radiants.
２．ＴＶ等級と眼視等級の比較
表２にＴＶ等級(Mtv)と眼視等級(SIGE:重野,TODA:戸田,(Mv:平均))の比較を示す。どの流星もＴＶ等級の方が 0.2 等〜2.6 等明るい(平均 1.2 等明るい)。ＩＩが赤外線にも感度を持つため、赤外線の多い流星が明るく写るためであろう。ＴＶ等級と眼視等級のズレ量(Mtv-Mv)が他の要因で変化するか調べた。図２に眼視等級(Mv),角速度(Va),観測速度(VO)との関係を示すが、特に傾向は見られない。

Table 2. Comparison between TV magnitude and Visual magnitude.
Obs. year: 2004 Va: Angular velocity(deg/sec) Mtv: TV magnitudeSIGE: Visual magnitude by SHIGENO TODA: Visual magnitude by TODAID DATE Co.Rad(2000) VOVaMtv SIGE TODA Mtv-Mv
ZG 0812 48.6 58.6 58.8 14.0 2.1 2.0 2.5 -0.2
ZH 0812 343.0 59.1 41.2 15.9 2.9 3.5 3.5 -0.6
ZI 0812 345.1-.7 41.8 20.5 2.7 4.0 3.0 -0.8
ZN 0812 50.5 56.4 60.3 13.1 -1.6 1.0 1.0 -2.6
ZO 0812 52.4 57.4 62.3 22.5 1.8 2.0-0.2
ZP 0812 54.9 59.4 57.6 21.1 2.7
3.0 -0.3
ZQ 0812 48.8 60.6 59.5 19.9 1.0 2.0 3.0 -1.5
ZS 0812 46.7 58.0 61.2 19.2 1.0 2.0-1.0
ZY 0812 335.8 54.3 41.4 15.3 2.9 4.0-1.1
Zb 0812 49.5 57.0 61.0 14.0 1.2 2.0-0.8

Mtv-Mv(mag)ID DATE Co.Rad(2000) VOVaMtv SIGE TODA Mtv-Mv
WO 0420 194.5 29.4 15.7 5.8 2.5 4.0-1.5
Xe 0811 337.3 75.5 35.4 16.2 2.0 2.5-0.5
Xi 0811 334.6 -3.4 25.8 11.0 3.1 4.0 3.0 -0.4
Xj 0811 350.0 -15.6 39.0 19.7 2.8 5.0 5.0 -2.2
Yd 0812 47.3 59.0 60.8 16.8 2.9 4.0-1.1
Yf 0812 50.0 58.6 59.9 19.8 1.9 4.0-2.1
Ym 0812 48.7 57.5 59.9 23.5 0.9 2.0 2.0 -1.1
Yp 0812 335.0 -3.4 32.1 13.4 3.0 4.0-1.0
Yr 0812 48.0 57.9 59.6 19.8 1.9 4.0-2.1
Z6 0812 50.8 57.3 61.4 23.4 -1.9 0.5-2.4
ZD 0812 47.1 57.2 60.2 14.4 -1.6 1.0-2.6

Mv(mag)Va(deg/sec)
VO(km/sec)
Figure 2 Comparison between deviation(Mtv-Mv) and Mv, Va, VO.
Table 3. 2004.08.11/12, 12/13 obs. 156 meteors
Co.Rad(2000) VG
216.5 48.6 4.8
243.9
3.9 7.5263.1
9.5 9.8
274.1 43.1 16.2
276.2 14.3 12.3
278.0 59.1 23.3
282.3 -3.3 6.8
290.4 32.1 20.9
300.2
3.9 17.2
300.5 -20.0 5.4
309.0 -4.4 18.7
310.6 -10.8 12.9
310.6 -11.2 20.7
324.7 -7.8 26.0
325.3 -15.3 25.1
327.6 61.1 39.3
331.3 11.9 34.3
334.6 -3.4 23.4
335.0 -3.4 30.1
335.8 54.3 40.0
337.3 75.5 33.6338.6 47.9 33.8
341.3
9.4 26.0
343.0 59.1 39.8
343.2 -12.8 31.0
343.2 13.3 44.0

Co.Rad(2000) VG
Co.Rad(2000) VG
Co.Rad(2000) VG
Co.Rad(2000) VG
Co.Rad(2000) VG
345.1-.7 40.5
29.0-.9 60.4 46.4 56.8 59.6
48.6 56.4 58.6
50.0 58.6 58.7
346.0
2.5 35.3
30.3 23.3 57.8 46.7 57.7 56.2
48.6 57.0 58.8
50.1 57.5 58.8
346.1 -3.6 38.4
30.3 43.6 50.2 46.7 58.0 60.1
48.6 57.6 58.0
50.2 56.5 57.4
346.1
1.6 38.5
35.0 26.3 57.8 46.8 55.9 57.4
48.6 58.1 57.3
50.5 56.4 59.2
346.2 -7.2 34.9
36.8 58.4 53.1 47.0 59.1 59.8
48.6 58.1 58.2
50.7 56.9 59.6
348.8 -11.3 36.8
36.9 57.8 56.2 47.1 57.2 59.0
48.6 58.6 57.6
50.8 53.4 59.7
349.4 -11.9 39.0
41.6 53.0 58.2 47.2 57.9 58.8
48.7 57.0 57.3
50.8 57.3 60.2
349.7 -14.2 38.6
41.8 14.1 67.8 47.3 57.6 59.8
48.7 57.5 58.7
51.0 58.9 55.0
350.0 -15.6 37.4
41.8 46.1 65.3 47.3 59.0 59.6
48.8 57.2 58.0
51.2 59.3 50.1
350.9 53.7 44.4
41.8 56.4 58.8 47.4 57.0 62.1
48.8 57.4 58.0
52.2 30.7 65.3
351.9 -17.2 36.1
41.8 59.7 59.8 47.4 57.5 59.0
48.8 60.6 58.4
52.4 53.8 56.3
355.2 -24.4 40.4
43.9 58.8 59.3 47.5 57.9 59.5
49.0 57.8 58.6
52.4 57.4 61.2
355.8
7.2 46.5
44.9
4.1 69.6 47.6 55.7 61.6
49.0 58.5 56.3
52.7 55.7 58.5
356.0 -17.4 42.5
45.1 45.9 57.5 47.6 58.6 59.5
49.1 57.6 59.4
52.8 54.7 61.2
2.8 70.4 40.0
45.6 -12.4 61.6 47.7 56.8 59.1
49.1 58.5 59.1
52.8 58.4 58.0
6.6 49.4 49.0
45.6 55.7 58.5 47.8 56.6 57.3
49.2 56.9 58.3
52.9 55.6 54.4
7.7 17.2 51.1
45.9 57.8 58.2 47.8 58.3 59.6
49.2 58.1 58.9
52.9 56.8 46.9
8.6 31.3 60.3
46.0
4.5 67.4 48.0 57.9 58.4
49.2 59.0 58.4
54.9 59.4 56.4
9.6 21.1 53.6
46.0 55.4 57.1 48.1 56.5 58.5
49.3 55.6 59.5
55.4 53.6 57.012.6 61.8 45.5
46.0 56.8 58.9 48.1 57.3 58.1
49.5 57.0 59.9
57.7 57.2 51.0
16.6 51.6 57.5
46.0 58.8 59.6 48.1 58.2 57.9
49.5 57.7 59.1
59.4 50.6 59.1
16.9
7.5 59.1
46.1 57.5 58.0 48.2 -12.5 62.5
49.6 33.1 64.7
65.1 52.0 61.8
18.7 10.7 65.7
46.1 58.6 59.5 48.2 55.8 56.7
49.7 58.0 58.4
75.1 50.2 50.8
20.9 34.3 40.3
46.2 56.6 58.2 48.3 57.8 58.0
49.8 58.7 57.4
77.9 38.4 59.3
21.2 45.1 54.4
46.3 57.9 57.9 48.3 57.9 58.6
49.9 57.3 56.4
78.6 41.7 53.3
24.8 43.5 49.5
46.4 56.7 60.2 48.4 57.6 58.4
50.0 57.2 60.4
90.5 46.8 54.7