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) |
| 2026-03-26 00:00 |
09:36:09.62 |
-19:13:32.4 |
HIP 47070 |
23.06 |
| 2026-03-26 12:00 |
09:36:07.54 |
-19:13:06.9 |
HIP 47070 |
23.28 |
| 2026-03-27 00:00 |
09:36:05.47 |
-19:12:41.2 |
HIP 47070 |
23.53 |
| 2026-03-27 12:00 |
09:36:03.42 |
-19:12:15.5 |
HIP 47070 |
23.79 |
| 2026-03-28 00:00 |
09:36:01.39 |
-19:11:49.8 |
HIP 47070 |
24.06 |
| 2026-03-28 12:00 |
09:35:59.38 |
-19:11:23.9 |
HIP 47070 |
24.36 |
| 2026-03-29 00:00 |
09:35:57.38 |
-19:10:58.0 |
HIP 47070 |
24.67 |
| 2026-03-29 12:00 |
09:35:55.40 |
-19:10:32.0 |
HIP 47070 |
24.99 |
| 2026-03-30 00:00 |
09:35:53.44 |
-19:10:06.0 |
HIP 47070 |
25.32 |
| 2026-03-30 12:00 |
09:35:51.50 |
-19:09:39.9 |
HIP 47070 |
25.67 |
| 2026-03-31 00:00 |
09:35:49.58 |
-19:09:13.8 |
HIP 47070 |
26.04 |
| 2026-03-31 12:00 |
09:35:47.68 |
-19:08:47.6 |
HIP 47070 |
26.41 |
| 2026-04-01 00:00 |
09:35:45.79 |
-19:08:21.3 |
HIP 47070 |
26.79 |
| 2026-04-01 12:00 |
09:35:43.93 |
-19:07:55.0 |
HIP 47070 |
27.19 |
| 2026-04-02 00:00 |
09:35:42.08 |
-19:07:28.7 |
HIP 47070 |
27.59 |
| 2026-04-02 12:00 |
09:35:40.25 |
-19:07:02.3 |
HIP 47070 |
28.00 |
| 2026-04-03 00:00 |
09:35:38.45 |
-19:06:35.8 |
HIP 46972 |
27.65 |
| 2026-04-03 12:00 |
09:35:36.66 |
-19:06:09.4 |
HIP 46972 |
27.04 |
| 2026-04-04 00:00 |
09:35:34.89 |
-19:05:42.8 |
HIP 46972 |
26.44 |
| 2026-04-04 12:00 |
09:35:33.14 |
-19:05:16.3 |
HIP 46972 |
25.83 |
| 2026-04-05 00:00 |
09:35:31.41 |
-19:04:49.7 |
HIP 46972 |
25.23 |
| 2026-04-05 12:00 |
09:35:29.70 |
-19:04:23.0 |
HIP 46972 |
24.63 |
| 2026-04-06 00:00 |
09:35:28.01 |
-19:03:56.3 |
HIP 46972 |
24.04 |
| 2026-04-06 12:00 |
09:35:26.34 |
-19:03:29.6 |
HIP 46972 |
23.44 |
| 2026-04-07 00:00 |
09:35:24.69 |
-19:03:02.9 |
HIP 46972 |
22.85 |
| 2026-04-07 12:00 |
09:35:23.06 |
-19:02:36.1 |
HIP 46972 |
22.26 |
| 2026-04-08 00:00 |
09:35:21.45 |
-19:02:09.3 |
HIP 46972 |
21.68 |
| 2026-04-08 12:00 |
09:35:19.87 |
-19:01:42.5 |
HIP 46972 |
21.09 |
| 2026-04-09 00:00 |
09:35:18.30 |
-19:01:15.7 |
HIP 46972 |
20.51 |
| 2026-04-09 12:00 |
09:35:16.75 |
-19:00:48.8 |
HIP 46972 |
19.94 |
| 2026-04-10 00:00 |
09:35:15.23 |
-19:00:22.0 |
HIP 46972 |
19.36 |
| 2026-04-10 12:00 |
09:35:13.72 |
-18:59:55.1 |
HIP 46972 |
18.79 |
| 2026-04-11 00:00 |
09:35:12.24 |
-18:59:28.2 |
HIP 46972 |
18.22 |
| 2026-04-11 12:00 |
09:35:10.78 |
-18:59:01.2 |
HIP 46972 |
17.65 |
| 2026-04-12 00:00 |
09:35:09.34 |
-18:58:34.3 |
HIP 46972 |
17.09 |
| 2026-04-12 12:00 |
09:35:07.92 |
-18:58:07.4 |
HIP 46972 |
16.53 |
| 2026-04-13 00:00 |
09:35:06.52 |
-18:57:40.4 |
HIP 46972 |
15.97 |
| 2026-04-13 12:00 |
09:35:05.14 |
-18:57:13.5 |
HIP 46972 |
15.42 |
| 2026-04-14 00:00 |
09:35:03.79 |
-18:56:46.6 |
HIP 46972 |
14.87 |
| 2026-04-14 12:00 |
09:35:02.46 |
-18:56:19.6 |
HIP 46972 |
14.32 |
| 2026-04-15 00:00 |
09:35:01.15 |
-18:55:52.7 |
HIP 46972 |
13.78 |
| 2026-04-15 12:00 |
09:34:59.86 |
-18:55:25.7 |
HIP 46972 |
13.23 |
| 2026-04-16 00:00 |
09:34:58.59 |
-18:54:58.8 |
HIP 46972 |
12.70 |