メタデータ
| 項目 |
値 |
| Designation |
C/2017 E2 (Tsuchinshan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-05-12T05:30:48.654720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:31Z |
| Obs used |
149 |
| NEO |
- |
| M1 |
14.500 |
| 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) |
2017-03-22.0000000 |
| e |
0.89088950 |
| q (au) |
2.353028 |
| a (au) |
21.565554 |
| i (deg) |
79.169792 |
| Ω (om, deg) |
11.562100 |
| ω (w, deg) |
89.463163 |
| M (ma, deg) |
3.087983 |
等級
散乱 + 全体線形
$$
M_a = (13.350 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.350 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.911 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
10:52:36.27 |
-60:59:46.6 |
HIP 53397 |
20.00 |
| 2026-07-29 12:00 |
10:52:44.39 |
-60:59:19.1 |
HIP 53397 |
18.95 |
| 2026-07-30 00:00 |
10:52:52.54 |
-60:58:52.2 |
HIP 53397 |
17.91 |
| 2026-07-30 12:00 |
10:53:00.74 |
-60:58:25.9 |
HIP 53397 |
16.87 |
| 2026-07-31 00:00 |
10:53:08.99 |
-60:58:00.1 |
HIP 53397 |
15.83 |
| 2026-07-31 12:00 |
10:53:17.28 |
-60:57:35.0 |
HIP 53397 |
14.79 |
| 2026-08-01 00:00 |
10:53:25.60 |
-60:57:10.4 |
HIP 53397 |
13.76 |
| 2026-08-01 12:00 |
10:53:33.97 |
-60:56:46.4 |
HIP 53397 |
12.73 |
| 2026-08-02 00:00 |
10:53:42.38 |
-60:56:22.9 |
HIP 53397 |
11.70 |
| 2026-08-02 12:00 |
10:53:50.83 |
-60:56:00.1 |
HIP 53397 |
10.68 |
| 2026-08-03 00:00 |
10:53:59.33 |
-60:55:37.8 |
HIP 53397 |
9.68 |
| 2026-08-03 12:00 |
10:54:07.86 |
-60:55:16.2 |
HIP 53397 |
8.68 |
| 2026-08-04 00:00 |
10:54:16.42 |
-60:54:55.1 |
HIP 53397 |
7.71 |
| 2026-08-04 12:00 |
10:54:25.03 |
-60:54:34.6 |
HIP 53397 |
6.77 |
| 2026-08-05 00:00 |
10:54:33.68 |
-60:54:14.7 |
HIP 53397 |
5.88 |
| 2026-08-05 12:00 |
10:54:42.36 |
-60:53:55.4 |
HIP 53397 |
5.07 |
| 2026-08-06 00:00 |
10:54:51.08 |
-60:53:36.7 |
HIP 53397 |
4.37 |
| 2026-08-06 12:00 |
10:54:59.84 |
-60:53:18.6 |
HIP 53397 |
3.85 |
| 2026-08-07 00:00 |
10:55:08.63 |
-60:53:01.1 |
HIP 53397 |
3.60 |
| 2026-08-07 12:00 |
10:55:17.45 |
-60:52:44.1 |
HIP 53397 |
3.67 |
| 2026-08-08 00:00 |
10:55:26.32 |
-60:52:27.8 |
HIP 53397 |
4.04 |
| 2026-08-08 12:00 |
10:55:35.21 |
-60:52:12.1 |
HIP 53397 |
4.65 |
| 2026-08-09 00:00 |
10:55:44.14 |
-60:51:57.0 |
HIP 53397 |
5.42 |
| 2026-08-09 12:00 |
10:55:53.11 |
-60:51:42.5 |
HIP 53397 |
6.28 |
| 2026-08-10 00:00 |
10:56:02.10 |
-60:51:28.5 |
HIP 53397 |
7.21 |
| 2026-08-10 12:00 |
10:56:11.13 |
-60:51:15.2 |
HIP 53397 |
8.19 |
| 2026-08-11 00:00 |
10:56:20.19 |
-60:51:02.5 |
HIP 53397 |
9.19 |
| 2026-08-11 12:00 |
10:56:29.28 |
-60:50:50.5 |
HIP 53397 |
10.22 |
| 2026-08-12 00:00 |
10:56:38.40 |
-60:50:39.0 |
HIP 53593 |
10.74 |
| 2026-08-12 12:00 |
10:56:47.55 |
-60:50:28.1 |
HIP 53593 |
9.73 |
| 2026-08-13 00:00 |
10:56:56.73 |
-60:50:17.8 |
HIP 53593 |
8.75 |
| 2026-08-13 12:00 |
10:57:05.94 |
-60:50:08.2 |
HIP 53593 |
7.83 |
| 2026-08-14 00:00 |
10:57:15.17 |
-60:49:59.2 |
HIP 53593 |
6.97 |
| 2026-08-14 12:00 |
10:57:24.44 |
-60:49:50.7 |
HIP 53593 |
6.21 |
| 2026-08-15 00:00 |
10:57:33.73 |
-60:49:42.9 |
HIP 53593 |
5.59 |
| 2026-08-15 12:00 |
10:57:43.04 |
-60:49:35.7 |
HIP 53593 |
5.15 |
| 2026-08-16 00:00 |
10:57:52.38 |
-60:49:29.1 |
HIP 53593 |
4.96 |
| 2026-08-16 12:00 |
10:58:01.75 |
-60:49:23.2 |
HIP 53593 |
5.04 |
| 2026-08-17 00:00 |
10:58:11.14 |
-60:49:17.8 |
HIP 53593 |
5.39 |
| 2026-08-17 12:00 |
10:58:20.55 |
-60:49:13.1 |
HIP 53593 |
5.94 |
| 2026-08-18 00:00 |
10:58:29.99 |
-60:49:08.9 |
HIP 53593 |
6.66 |
| 2026-08-18 12:00 |
10:58:39.45 |
-60:49:05.4 |
HIP 53593 |
7.50 |
| 2026-08-19 00:00 |
10:58:48.93 |
-60:49:02.5 |
HIP 53593 |
8.42 |