メタデータ
| 項目 |
値 |
| Designation |
109P/Swift-Tuttle |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1992-12-11T23:59:41.389440Z |
| Orbit solution date (soln_date, UTC) |
2001-10-09T15:34:49Z |
| Obs used |
652 |
| NEO |
Yes |
| M1 |
4.500 |
| K1 |
15.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1995-10-10.0000000 |
| e |
0.96322576 |
| q (au) |
0.959516 |
| a (au) |
26.092069 |
| i (deg) |
113.453817 |
| Ω (om, deg) |
139.381192 |
| ω (w, deg) |
152.982168 |
| M (ma, deg) |
7.631696 |
等級
散乱 + 全体線形
$$
M_a = (4.031 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.031 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.861 |
| k |
0.996 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1992-01-03 |
1992-12-11 |
+4.1490 |
-0.126 |
| 1992-12-12 |
1993-03-09 |
+2.1256 |
-0.154 |
| 1993-03-09 |
1995-04-05 |
-0.7717 |
+0.720 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
09:38:14.95 |
-18:02:36.0 |
HIP 47360 |
13.34 |
| 2026-07-29 12:00 |
09:38:17.49 |
-18:02:39.4 |
HIP 47360 |
12.84 |
| 2026-07-30 00:00 |
09:38:20.04 |
-18:02:43.0 |
HIP 47360 |
12.35 |
| 2026-07-30 12:00 |
09:38:22.59 |
-18:02:46.8 |
HIP 47360 |
11.86 |
| 2026-07-31 00:00 |
09:38:25.15 |
-18:02:50.8 |
HIP 47360 |
11.39 |
| 2026-07-31 12:00 |
09:38:27.72 |
-18:02:55.0 |
HIP 47360 |
10.92 |
| 2026-08-01 00:00 |
09:38:30.29 |
-18:02:59.4 |
HIP 47360 |
10.46 |
| 2026-08-01 12:00 |
09:38:32.86 |
-18:03:04.0 |
HIP 47360 |
10.02 |
| 2026-08-02 00:00 |
09:38:35.44 |
-18:03:08.8 |
HIP 47360 |
9.59 |
| 2026-08-02 12:00 |
09:38:38.03 |
-18:03:13.7 |
HIP 47360 |
9.19 |
| 2026-08-03 00:00 |
09:38:40.61 |
-18:03:18.9 |
HIP 47360 |
8.80 |
| 2026-08-03 12:00 |
09:38:43.21 |
-18:03:24.2 |
HIP 47360 |
8.44 |
| 2026-08-04 00:00 |
09:38:45.81 |
-18:03:29.8 |
HIP 47360 |
8.11 |
| 2026-08-04 12:00 |
09:38:48.41 |
-18:03:35.5 |
HIP 47360 |
7.81 |
| 2026-08-05 00:00 |
09:38:51.01 |
-18:03:41.5 |
HIP 47360 |
7.54 |
| 2026-08-05 12:00 |
09:38:53.62 |
-18:03:47.6 |
HIP 47360 |
7.32 |
| 2026-08-06 00:00 |
09:38:56.23 |
-18:03:53.9 |
HIP 47360 |
7.15 |
| 2026-08-06 12:00 |
09:38:58.85 |
-18:04:00.4 |
HIP 47360 |
7.02 |
| 2026-08-07 00:00 |
09:39:01.47 |
-18:04:07.1 |
HIP 47360 |
6.94 |
| 2026-08-07 12:00 |
09:39:04.09 |
-18:04:13.9 |
HIP 47360 |
6.92 |
| 2026-08-08 00:00 |
09:39:06.72 |
-18:04:21.0 |
HIP 47360 |
6.95 |
| 2026-08-08 12:00 |
09:39:09.34 |
-18:04:28.3 |
HIP 47360 |
7.04 |
| 2026-08-09 00:00 |
09:39:11.97 |
-18:04:35.7 |
HIP 47360 |
7.18 |
| 2026-08-09 12:00 |
09:39:14.61 |
-18:04:43.3 |
HIP 47420 |
7.21 |
| 2026-08-10 00:00 |
09:39:17.24 |
-18:04:51.2 |
HIP 47420 |
6.60 |
| 2026-08-10 12:00 |
09:39:19.88 |
-18:04:59.2 |
HIP 47420 |
6.00 |
| 2026-08-11 00:00 |
09:39:22.52 |
-18:05:07.4 |
HIP 47420 |
5.40 |
| 2026-08-11 12:00 |
09:39:25.16 |
-18:05:15.7 |
HIP 47420 |
4.82 |
| 2026-08-12 00:00 |
09:39:27.80 |
-18:05:24.3 |
HIP 47420 |
4.26 |
| 2026-08-12 12:00 |
09:39:30.44 |
-18:05:33.0 |
HIP 47420 |
3.72 |
| 2026-08-13 00:00 |
09:39:33.09 |
-18:05:42.0 |
HIP 47420 |
3.23 |
| 2026-08-13 12:00 |
09:39:35.73 |
-18:05:51.1 |
HIP 47420 |
2.79 |
| 2026-08-14 00:00 |
09:39:38.37 |
-18:06:00.4 |
HIP 47420 |
2.46 |
| 2026-08-14 12:00 |
09:39:41.02 |
-18:06:09.8 |
HIP 47420 |
2.27 |
| 2026-08-15 00:00 |
09:39:43.67 |
-18:06:19.5 |
HIP 47420 |
2.26 |
| 2026-08-15 12:00 |
09:39:46.31 |
-18:06:29.3 |
HIP 47420 |
2.43 |
| 2026-08-16 00:00 |
09:39:48.96 |
-18:06:39.3 |
HIP 47420 |
2.75 |
| 2026-08-16 12:00 |
09:39:51.60 |
-18:06:49.5 |
HIP 47420 |
3.18 |
| 2026-08-17 00:00 |
09:39:54.25 |
-18:06:59.9 |
HIP 47420 |
3.67 |
| 2026-08-17 12:00 |
09:39:56.89 |
-18:07:10.4 |
HIP 47420 |
4.21 |
| 2026-08-18 00:00 |
09:39:59.53 |
-18:07:21.1 |
HIP 47420 |
4.78 |
| 2026-08-18 12:00 |
09:40:02.18 |
-18:07:32.0 |
HIP 47420 |
5.37 |
| 2026-08-19 00:00 |
09:40:04.82 |
-18:07:43.1 |
HIP 47420 |
5.98 |