メタデータ
| 項目 |
値 |
| Designation |
8P/Tuttle |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-01-27T00:25:56.539200Z |
| Orbit solution date (soln_date, UTC) |
2022-05-02T08:47:13Z |
| Obs used |
1768 |
| NEO |
Yes |
| M1 |
14.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-08-23.0000000 |
| e |
0.81978762 |
| q (au) |
1.027263 |
| a (au) |
5.700291 |
| i (deg) |
54.981969 |
| Ω (om, deg) |
270.342162 |
| ω (w, deg) |
207.511518 |
| M (ma, deg) |
15.134474 |
等級
散乱 + 全体線形
$$
M_a = (9.885 + 4.854\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.885 |
| n |
4.854 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2020-06-21 |
2021-10-15 |
-12.4684 |
-1.024 |
| 2021-10-15 |
2021-08-27 |
+7.6790 |
-2.670 |
| 2021-08-27 |
2022-03-19 |
-2.4327 |
+1.020 |
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 |
18:54:12.53 |
-07:00:10.5 |
HIP 92868 |
18.17 |
| 2026-06-01 12:00 |
18:54:02.37 |
-06:59:33.3 |
HIP 92766 |
20.12 |
| 2026-06-02 00:00 |
18:53:52.14 |
-06:58:56.6 |
HIP 92766 |
21.20 |
| 2026-06-02 12:00 |
18:53:41.85 |
-06:58:20.2 |
HIP 92766 |
22.53 |
| 2026-06-03 00:00 |
18:53:31.50 |
-06:57:44.3 |
HIP 92601 |
20.82 |
| 2026-06-03 12:00 |
18:53:21.08 |
-06:57:08.8 |
HIP 92601 |
18.31 |
| 2026-06-04 00:00 |
18:53:10.60 |
-06:56:33.7 |
HIP 92601 |
15.83 |
| 2026-06-04 12:00 |
18:53:00.06 |
-06:55:59.0 |
HIP 92601 |
13.41 |
| 2026-06-05 00:00 |
18:52:49.46 |
-06:55:24.8 |
HIP 92601 |
11.10 |
| 2026-06-05 12:00 |
18:52:38.79 |
-06:54:51.0 |
HIP 92601 |
8.97 |
| 2026-06-06 00:00 |
18:52:28.07 |
-06:54:17.7 |
HIP 92601 |
7.23 |
| 2026-06-06 12:00 |
18:52:17.29 |
-06:53:44.7 |
HIP 92601 |
6.22 |
| 2026-06-07 00:00 |
18:52:06.45 |
-06:53:12.3 |
HIP 92601 |
6.32 |
| 2026-06-07 12:00 |
18:51:55.56 |
-06:52:40.2 |
HIP 92601 |
7.50 |
| 2026-06-08 00:00 |
18:51:44.61 |
-06:52:08.6 |
HIP 92601 |
9.37 |
| 2026-06-08 12:00 |
18:51:33.61 |
-06:51:37.4 |
HIP 92601 |
11.61 |
| 2026-06-09 00:00 |
18:51:22.55 |
-06:51:06.7 |
HIP 92601 |
14.05 |
| 2026-06-09 12:00 |
18:51:11.45 |
-06:50:36.5 |
HIP 92601 |
16.61 |
| 2026-06-10 00:00 |
18:51:00.29 |
-06:50:06.6 |
HIP 92601 |
19.24 |
| 2026-06-10 12:00 |
18:50:49.08 |
-06:49:37.3 |
HIP 92601 |
21.93 |
| 2026-06-11 00:00 |
18:50:37.82 |
-06:49:08.3 |
HIP 92601 |
24.65 |
| 2026-06-11 12:00 |
18:50:26.51 |
-06:48:39.9 |
HIP 92422 |
24.21 |
| 2026-06-12 00:00 |
18:50:15.16 |
-06:48:11.8 |
HIP 92422 |
23.30 |
| 2026-06-12 12:00 |
18:50:03.76 |
-06:47:44.3 |
HIP 92422 |
22.72 |
| 2026-06-13 00:00 |
18:49:52.32 |
-06:47:17.2 |
HIP 92422 |
22.50 |
| 2026-06-13 12:00 |
18:49:40.83 |
-06:46:50.5 |
HIP 92422 |
22.66 |
| 2026-06-14 00:00 |
18:49:29.30 |
-06:46:24.3 |
HIP 92289 |
23.10 |
| 2026-06-14 12:00 |
18:49:17.73 |
-06:45:58.6 |
HIP 92289 |
21.14 |
| 2026-06-15 00:00 |
18:49:06.12 |
-06:45:33.4 |
HIP 92289 |
19.41 |
| 2026-06-15 12:00 |
18:48:54.47 |
-06:45:08.5 |
HIP 92289 |
18.00 |
| 2026-06-16 00:00 |
18:48:42.78 |
-06:44:44.2 |
HIP 92289 |
16.99 |
| 2026-06-16 12:00 |
18:48:31.06 |
-06:44:20.3 |
HIP 92289 |
16.45 |
| 2026-06-17 00:00 |
18:48:19.30 |
-06:43:56.9 |
HIP 92289 |
16.44 |
| 2026-06-17 12:00 |
18:48:07.51 |
-06:43:34.0 |
HIP 92289 |
16.96 |
| 2026-06-18 00:00 |
18:47:55.69 |
-06:43:11.5 |
HIP 92289 |
17.96 |
| 2026-06-18 12:00 |
18:47:43.83 |
-06:42:49.5 |
HIP 92289 |
19.38 |
| 2026-06-19 00:00 |
18:47:31.94 |
-06:42:27.9 |
HIP 92289 |
21.14 |
| 2026-06-19 12:00 |
18:47:20.03 |
-06:42:06.8 |
HIP 92289 |
23.15 |
| 2026-06-20 00:00 |
18:47:08.09 |
-06:41:46.2 |
HIP 92210 |
24.24 |
| 2026-06-20 12:00 |
18:46:56.12 |
-06:41:26.1 |
HIP 92054 |
22.56 |
| 2026-06-21 00:00 |
18:46:44.13 |
-06:41:06.4 |
HIP 92054 |
20.10 |
| 2026-06-21 12:00 |
18:46:32.11 |
-06:40:47.1 |
HIP 92054 |
17.80 |
| 2026-06-22 00:00 |
18:46:20.07 |
-06:40:28.4 |
HIP 92054 |
15.75 |