C/2017 E2 (Tsuchinshan)
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 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
11:22:48.27 |
-64:53:48.3 |
HIP 55597 |
4.94 |
| 2026-02-03 12:00 |
11:22:37.18 |
-64:54:35.2 |
HIP 55597 |
5.41 |
| 2026-02-04 00:00 |
11:22:26.01 |
-64:55:21.5 |
HIP 55597 |
6.18 |
| 2026-02-04 12:00 |
11:22:14.77 |
-64:56:07.0 |
HIP 55597 |
7.15 |
| 2026-02-05 00:00 |
11:22:03.44 |
-64:56:51.8 |
HIP 55597 |
8.27 |
| 2026-02-05 12:00 |
11:21:52.04 |
-64:57:35.9 |
HIP 55597 |
9.46 |
| 2026-02-06 00:00 |
11:21:40.56 |
-64:58:19.4 |
HIP 55597 |
10.72 |
| 2026-02-06 12:00 |
11:21:29.01 |
-64:59:02.1 |
HIP 55597 |
12.02 |
| 2026-02-07 00:00 |
11:21:17.38 |
-64:59:44.0 |
HIP 55597 |
13.35 |
| 2026-02-07 12:00 |
11:21:05.69 |
-65:00:25.3 |
HIP 55273 |
12.19 |
| 2026-02-08 00:00 |
11:20:53.92 |
-65:01:05.8 |
HIP 55273 |
10.84 |
| 2026-02-08 12:00 |
11:20:42.07 |
-65:01:45.6 |
HIP 55273 |
9.51 |
| 2026-02-09 00:00 |
11:20:30.16 |
-65:02:24.7 |
HIP 55273 |
8.19 |
| 2026-02-09 12:00 |
11:20:18.18 |
-65:03:03.0 |
HIP 55273 |
6.91 |
| 2026-02-10 00:00 |
11:20:06.14 |
-65:03:40.6 |
HIP 55273 |
5.68 |
| 2026-02-10 12:00 |
11:19:54.02 |
-65:04:17.5 |
HIP 55273 |
4.55 |
| 2026-02-11 00:00 |
11:19:41.84 |
-65:04:53.5 |
HIP 55273 |
3.63 |
| 2026-02-11 12:00 |
11:19:29.60 |
-65:05:28.9 |
HIP 55273 |
3.08 |
| 2026-02-12 00:00 |
11:19:17.29 |
-65:06:03.5 |
HIP 55273 |
3.13 |
| 2026-02-12 12:00 |
11:19:04.92 |
-65:06:37.3 |
HIP 55273 |
3.75 |
| 2026-02-13 00:00 |
11:18:52.49 |
-65:07:10.3 |
HIP 55273 |
4.72 |
| 2026-02-13 12:00 |
11:18:40.00 |
-65:07:42.6 |
HIP 55273 |
5.87 |
| 2026-02-14 00:00 |
11:18:27.44 |
-65:08:14.2 |
HIP 55273 |
7.11 |
| 2026-02-14 12:00 |
11:18:14.84 |
-65:08:44.9 |
HIP 55273 |
8.40 |
| 2026-02-15 00:00 |
11:18:02.17 |
-65:09:14.9 |
HIP 55273 |
9.73 |
| 2026-02-15 12:00 |
11:17:49.45 |
-65:09:44.1 |
HIP 55273 |
11.07 |
| 2026-02-16 00:00 |
11:17:36.68 |
-65:10:12.5 |
HIP 55273 |
12.43 |
| 2026-02-16 12:00 |
11:17:23.85 |
-65:10:40.1 |
HIP 55273 |
13.80 |
| 2026-02-17 00:00 |
11:17:10.98 |
-65:11:07.0 |
HIP 55273 |
15.18 |
| 2026-02-17 12:00 |
11:16:58.05 |
-65:11:33.0 |
HIP 55273 |
16.56 |
| 2026-02-18 00:00 |
11:16:45.07 |
-65:11:58.3 |
HIP 55273 |
17.95 |
| 2026-02-18 12:00 |
11:16:32.05 |
-65:12:22.7 |
HIP 55273 |
19.34 |
| 2026-02-19 00:00 |
11:16:18.98 |
-65:12:46.4 |
HIP 55273 |
20.73 |
| 2026-02-19 12:00 |
11:16:05.86 |
-65:13:09.2 |
HIP 55273 |
22.13 |
| 2026-02-20 00:00 |
11:15:52.71 |
-65:13:31.3 |
HIP 54727 |
22.68 |
| 2026-02-20 12:00 |
11:15:39.51 |
-65:13:52.6 |
HIP 54727 |
21.31 |
| 2026-02-21 00:00 |
11:15:26.26 |
-65:14:13.0 |
HIP 54727 |
19.93 |
| 2026-02-21 12:00 |
11:15:12.98 |
-65:14:32.7 |
HIP 54727 |
18.57 |
| 2026-02-22 00:00 |
11:14:59.66 |
-65:14:51.5 |
HIP 54727 |
17.20 |
| 2026-02-22 12:00 |
11:14:46.31 |
-65:15:09.6 |
HIP 54727 |
15.84 |
| 2026-02-23 00:00 |
11:14:32.92 |
-65:15:26.8 |
HIP 54727 |
14.50 |
| 2026-02-23 12:00 |
11:14:19.49 |
-65:15:43.2 |
HIP 54727 |
13.16 |
| 2026-02-24 00:00 |
11:14:06.04 |
-65:15:58.8 |
HIP 54727 |
11.84 |