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) |
| 2026-06-01 00:00 |
09:34:40.64 |
-18:18:15.3 |
HIP 46972 |
27.15 |
| 2026-06-01 12:00 |
09:34:41.50 |
-18:17:56.6 |
HIP 46972 |
27.49 |
| 2026-06-02 00:00 |
09:34:42.39 |
-18:17:38.1 |
HIP 46972 |
27.82 |
| 2026-06-02 12:00 |
09:34:43.29 |
-18:17:19.8 |
HIP 46972 |
28.16 |
| 2026-06-03 00:00 |
09:34:44.22 |
-18:17:01.6 |
HIP 46972 |
28.49 |
| 2026-06-03 12:00 |
09:34:45.17 |
-18:16:43.6 |
HIP 46972 |
28.82 |
| 2026-06-04 00:00 |
09:34:46.13 |
-18:16:25.8 |
HIP 46972 |
29.16 |
| 2026-06-04 12:00 |
09:34:47.12 |
-18:16:08.1 |
HIP 46972 |
29.49 |
| 2026-06-05 00:00 |
09:34:48.13 |
-18:15:50.5 |
HIP 46972 |
29.82 |
| 2026-06-05 12:00 |
09:34:49.16 |
-18:15:33.2 |
HIP 46972 |
30.15 |
| 2026-06-06 00:00 |
09:34:50.21 |
-18:15:16.0 |
HIP 46972 |
30.48 |
| 2026-06-06 12:00 |
09:34:51.28 |
-18:14:58.9 |
HIP 46972 |
30.81 |
| 2026-06-07 00:00 |
09:34:52.38 |
-18:14:42.1 |
HIP 46972 |
31.14 |
| 2026-06-07 12:00 |
09:34:53.49 |
-18:14:25.4 |
HIP 46972 |
31.47 |
| 2026-06-08 00:00 |
09:34:54.62 |
-18:14:08.8 |
HIP 46972 |
31.79 |
| 2026-06-08 12:00 |
09:34:55.77 |
-18:13:52.4 |
HIP 46972 |
32.12 |
| 2026-06-09 00:00 |
09:34:56.95 |
-18:13:36.2 |
HIP 46972 |
32.45 |
| 2026-06-09 12:00 |
09:34:58.14 |
-18:13:20.2 |
HIP 46972 |
32.78 |
| 2026-06-10 00:00 |
09:34:59.35 |
-18:13:04.3 |
HIP 46972 |
33.10 |
| 2026-06-10 12:00 |
09:35:00.58 |
-18:12:48.7 |
HIP 46972 |
33.43 |
| 2026-06-11 00:00 |
09:35:01.84 |
-18:12:33.1 |
HIP 46972 |
33.76 |
| 2026-06-11 12:00 |
09:35:03.11 |
-18:12:17.8 |
HIP 46972 |
34.08 |
| 2026-06-12 00:00 |
09:35:04.40 |
-18:12:02.6 |
HIP 46972 |
34.41 |
| 2026-06-12 12:00 |
09:35:05.71 |
-18:11:47.7 |
HIP 46972 |
34.73 |
| 2026-06-13 00:00 |
09:35:07.04 |
-18:11:32.9 |
HIP 46972 |
35.06 |
| 2026-06-13 12:00 |
09:35:08.39 |
-18:11:18.2 |
HIP 46972 |
35.39 |
| 2026-06-14 00:00 |
09:35:09.76 |
-18:11:03.8 |
HIP 46972 |
35.71 |
| 2026-06-14 12:00 |
09:35:11.15 |
-18:10:49.5 |
HIP 46972 |
36.04 |
| 2026-06-15 00:00 |
09:35:12.56 |
-18:10:35.4 |
HIP 46972 |
36.37 |
| 2026-06-15 12:00 |
09:35:13.98 |
-18:10:21.5 |
HIP 46972 |
36.69 |
| 2026-06-16 00:00 |
09:35:15.43 |
-18:10:07.8 |
HIP 46972 |
37.02 |
| 2026-06-16 12:00 |
09:35:16.89 |
-18:09:54.2 |
HIP 46972 |
37.35 |
| 2026-06-17 00:00 |
09:35:18.37 |
-18:09:40.9 |
HIP 46972 |
37.67 |
| 2026-06-17 12:00 |
09:35:19.87 |
-18:09:27.7 |
HIP 46972 |
38.00 |
| 2026-06-18 00:00 |
09:35:21.39 |
-18:09:14.7 |
HIP 46972 |
38.33 |
| 2026-06-18 12:00 |
09:35:22.93 |
-18:09:01.9 |
HIP 46972 |
38.66 |
| 2026-06-19 00:00 |
09:35:24.48 |
-18:08:49.3 |
HIP 46972 |
38.99 |
| 2026-06-19 12:00 |
09:35:26.06 |
-18:08:36.9 |
HIP 46972 |
39.32 |
| 2026-06-20 00:00 |
09:35:27.65 |
-18:08:24.7 |
HIP 46972 |
39.65 |
| 2026-06-20 12:00 |
09:35:29.25 |
-18:08:12.6 |
HIP 46972 |
39.98 |
| 2026-06-21 00:00 |
09:35:30.88 |
-18:08:00.8 |
HIP 46972 |
40.31 |
| 2026-06-21 12:00 |
09:35:32.52 |
-18:07:49.1 |
HIP 46972 |
40.64 |
| 2026-06-22 00:00 |
09:35:34.18 |
-18:07:37.6 |
HIP 46972 |
40.97 |