メタデータ
| 項目 |
値 |
| Designation |
66P/du Toit |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-20T11:15:17.081280Z |
| Orbit solution date (soln_date, UTC) |
2019-06-03T14:53:20Z |
| Obs used |
547 |
| NEO |
Yes |
| M1 |
15.700 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-31.0000000 |
| e |
0.78656817 |
| q (au) |
1.285451 |
| a (au) |
6.022773 |
| i (deg) |
18.668971 |
| Ω (om, deg) |
21.999851 |
| ω (w, deg) |
257.342734 |
| M (ma, deg) |
273.482032 |
等級
散乱 + 全体線形
$$
M_a = (13.128 + 5.614\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.128 |
| n |
5.614 |
| gf |
0.972 |
| gb |
-0.780 |
| k |
0.995 |
| δ90 |
9.986 |
| 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 |
| 2018-01-14 |
2018-05-20 |
+20.2694 |
-4.971 |
| 2018-05-21 |
2018-10-04 |
+19.3493 |
-5.821 |
| 2018-10-04 |
2018-11-10 |
-27.9513 |
+9.461 |
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 |
07:11:02.00 |
+39:30:25.0 |
HIP 34752 |
13.30 |
| 2026-07-29 12:00 |
07:11:15.96 |
+39:30:21.6 |
HIP 34752 |
12.01 |
| 2026-07-30 00:00 |
07:11:29.89 |
+39:30:18.5 |
HIP 34752 |
11.22 |
| 2026-07-30 12:00 |
07:11:43.80 |
+39:30:15.6 |
HIP 34809 |
9.11 |
| 2026-07-31 00:00 |
07:11:57.67 |
+39:30:13.0 |
HIP 34809 |
7.32 |
| 2026-07-31 12:00 |
07:12:11.52 |
+39:30:10.8 |
HIP 34809 |
6.21 |
| 2026-08-01 00:00 |
07:12:25.33 |
+39:30:08.8 |
HIP 34809 |
6.14 |
| 2026-08-01 12:00 |
07:12:39.11 |
+39:30:07.1 |
HIP 34809 |
7.14 |
| 2026-08-02 00:00 |
07:12:52.86 |
+39:30:05.7 |
HIP 34809 |
8.84 |
| 2026-08-02 12:00 |
07:13:06.58 |
+39:30:04.7 |
HIP 34809 |
10.91 |
| 2026-08-03 00:00 |
07:13:20.26 |
+39:30:03.9 |
HIP 34809 |
13.19 |
| 2026-08-03 12:00 |
07:13:33.91 |
+39:30:03.4 |
HIP 34809 |
15.57 |
| 2026-08-04 00:00 |
07:13:47.53 |
+39:30:03.3 |
HIP 34809 |
18.01 |
| 2026-08-04 12:00 |
07:14:01.11 |
+39:30:03.4 |
HIP 34809 |
20.49 |
| 2026-08-05 00:00 |
07:14:14.65 |
+39:30:03.9 |
HIP 34809 |
23.00 |
| 2026-08-05 12:00 |
07:14:28.16 |
+39:30:04.6 |
HIP 34809 |
25.51 |
| 2026-08-06 00:00 |
07:14:41.63 |
+39:30:05.7 |
HIP 34809 |
28.04 |
| 2026-08-06 12:00 |
07:14:55.06 |
+39:30:07.1 |
HIP 34809 |
30.56 |
| 2026-08-07 00:00 |
07:15:08.46 |
+39:30:08.7 |
HIP 34809 |
33.09 |
| 2026-08-07 12:00 |
07:15:21.81 |
+39:30:10.7 |
HIP 35365 |
34.75 |
| 2026-08-08 00:00 |
07:15:35.13 |
+39:30:13.1 |
HIP 35365 |
32.23 |
| 2026-08-08 12:00 |
07:15:48.40 |
+39:30:15.7 |
HIP 35365 |
29.72 |
| 2026-08-09 00:00 |
07:16:01.64 |
+39:30:18.6 |
HIP 35365 |
27.22 |
| 2026-08-09 12:00 |
07:16:14.83 |
+39:30:21.9 |
HIP 35365 |
24.75 |
| 2026-08-10 00:00 |
07:16:27.98 |
+39:30:25.5 |
HIP 35365 |
22.30 |
| 2026-08-10 12:00 |
07:16:41.09 |
+39:30:29.4 |
HIP 35365 |
19.87 |
| 2026-08-11 00:00 |
07:16:54.15 |
+39:30:33.6 |
HIP 35365 |
17.48 |
| 2026-08-11 12:00 |
07:17:07.17 |
+39:30:38.2 |
HIP 35365 |
15.13 |
| 2026-08-12 00:00 |
07:17:20.14 |
+39:30:43.1 |
HIP 35365 |
12.86 |
| 2026-08-12 12:00 |
07:17:33.07 |
+39:30:48.3 |
HIP 35365 |
10.69 |
| 2026-08-13 00:00 |
07:17:45.95 |
+39:30:53.8 |
HIP 35365 |
8.69 |
| 2026-08-13 12:00 |
07:17:58.79 |
+39:30:59.7 |
HIP 35365 |
7.02 |
| 2026-08-14 00:00 |
07:18:11.57 |
+39:31:05.9 |
HIP 35365 |
5.93 |
| 2026-08-14 12:00 |
07:18:24.31 |
+39:31:12.4 |
HIP 35365 |
5.76 |
| 2026-08-15 00:00 |
07:18:36.99 |
+39:31:19.3 |
HIP 35365 |
6.57 |
| 2026-08-15 12:00 |
07:18:49.63 |
+39:31:26.5 |
HIP 35365 |
8.06 |
| 2026-08-16 00:00 |
07:19:02.22 |
+39:31:34.0 |
HIP 35365 |
9.92 |
| 2026-08-16 12:00 |
07:19:14.75 |
+39:31:41.9 |
HIP 35365 |
11.97 |
| 2026-08-17 00:00 |
07:19:27.24 |
+39:31:50.1 |
HIP 35365 |
14.13 |
| 2026-08-17 12:00 |
07:19:39.67 |
+39:31:58.6 |
HIP 35365 |
16.35 |
| 2026-08-18 00:00 |
07:19:52.05 |
+39:32:07.5 |
HIP 35365 |
18.60 |
| 2026-08-18 12:00 |
07:20:04.37 |
+39:32:16.7 |
HIP 35365 |
20.87 |
| 2026-08-19 00:00 |
07:20:16.64 |
+39:32:26.3 |
HIP 35558 |
22.65 |