メタデータ
| 項目 |
値 |
| Designation |
C/2015 T5 (Sheppard-Tholen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-01-24T12:14:36.277440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:15Z |
| Obs used |
22 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-20.0000000 |
| e |
0.66608261 |
| q (au) |
9.338302 |
| a (au) |
27.965906 |
| i (deg) |
11.048354 |
| Ω (om, deg) |
311.192699 |
| ω (w, deg) |
61.838999 |
| M (ma, deg) |
359.763346 |
等級
散乱 + 全体線形
$$
M_a = (1.931 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.931 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
07:35:20.27 |
+24:48:35.9 |
HIP 36874 |
11.05 |
| 2026-05-12 12:00 |
07:35:25.09 |
+24:48:16.7 |
HIP 36874 |
12.00 |
| 2026-05-13 00:00 |
07:35:29.96 |
+24:47:57.4 |
HIP 36874 |
12.98 |
| 2026-05-13 12:00 |
07:35:34.88 |
+24:47:37.9 |
HIP 36874 |
14.00 |
| 2026-05-14 00:00 |
07:35:39.85 |
+24:47:18.4 |
HIP 36874 |
15.05 |
| 2026-05-14 12:00 |
07:35:44.86 |
+24:46:58.9 |
HIP 36874 |
16.12 |
| 2026-05-15 00:00 |
07:35:49.91 |
+24:46:39.2 |
HIP 36874 |
17.22 |
| 2026-05-15 12:00 |
07:35:55.01 |
+24:46:19.4 |
HIP 36874 |
18.34 |
| 2026-05-16 00:00 |
07:36:00.16 |
+24:45:59.6 |
HIP 36874 |
19.47 |
| 2026-05-16 12:00 |
07:36:05.35 |
+24:45:39.7 |
HIP 36874 |
20.63 |
| 2026-05-17 00:00 |
07:36:10.59 |
+24:45:19.7 |
HIP 36874 |
21.80 |
| 2026-05-17 12:00 |
07:36:15.86 |
+24:44:59.7 |
HIP 36874 |
22.99 |
| 2026-05-18 00:00 |
07:36:21.19 |
+24:44:39.5 |
HIP 36874 |
24.19 |
| 2026-05-18 12:00 |
07:36:26.55 |
+24:44:19.3 |
HIP 36874 |
25.41 |
| 2026-05-19 00:00 |
07:36:31.96 |
+24:43:59.0 |
HIP 37180 |
25.05 |
| 2026-05-19 12:00 |
07:36:37.41 |
+24:43:38.6 |
HIP 37180 |
23.78 |
| 2026-05-20 00:00 |
07:36:42.91 |
+24:43:18.2 |
HIP 37180 |
22.51 |
| 2026-05-20 12:00 |
07:36:48.44 |
+24:42:57.7 |
HIP 37180 |
21.22 |
| 2026-05-21 00:00 |
07:36:54.02 |
+24:42:37.1 |
HIP 37180 |
19.94 |
| 2026-05-21 12:00 |
07:36:59.63 |
+24:42:16.4 |
HIP 37180 |
18.64 |
| 2026-05-22 00:00 |
07:37:05.29 |
+24:41:55.7 |
HIP 37180 |
17.34 |
| 2026-05-22 12:00 |
07:37:10.99 |
+24:41:34.9 |
HIP 37180 |
16.04 |
| 2026-05-23 00:00 |
07:37:16.73 |
+24:41:14.0 |
HIP 37180 |
14.73 |
| 2026-05-23 12:00 |
07:37:22.50 |
+24:40:53.0 |
HIP 37180 |
13.43 |
| 2026-05-24 00:00 |
07:37:28.32 |
+24:40:32.0 |
HIP 37180 |
12.12 |
| 2026-05-24 12:00 |
07:37:34.17 |
+24:40:10.9 |
HIP 37180 |
10.83 |
| 2026-05-25 00:00 |
07:37:40.07 |
+24:39:49.8 |
HIP 37180 |
9.54 |
| 2026-05-25 12:00 |
07:37:46.00 |
+24:39:28.6 |
HIP 37180 |
8.28 |
| 2026-05-26 00:00 |
07:37:51.97 |
+24:39:07.3 |
HIP 37180 |
7.06 |
| 2026-05-26 12:00 |
07:37:57.98 |
+24:38:45.9 |
HIP 37180 |
5.92 |
| 2026-05-27 00:00 |
07:38:04.02 |
+24:38:24.5 |
HIP 37180 |
4.91 |
| 2026-05-27 12:00 |
07:38:10.10 |
+24:38:03.0 |
HIP 37180 |
4.14 |
| 2026-05-28 00:00 |
07:38:16.22 |
+24:37:41.5 |
HIP 37180 |
3.78 |
| 2026-05-28 12:00 |
07:38:22.37 |
+24:37:19.9 |
HIP 37180 |
3.94 |
| 2026-05-29 00:00 |
07:38:28.56 |
+24:36:58.2 |
HIP 37180 |
4.58 |
| 2026-05-29 12:00 |
07:38:34.78 |
+24:36:36.5 |
HIP 37180 |
5.54 |
| 2026-05-30 00:00 |
07:38:41.04 |
+24:36:14.7 |
HIP 37180 |
6.69 |
| 2026-05-30 12:00 |
07:38:47.33 |
+24:35:52.8 |
HIP 37180 |
7.95 |
| 2026-05-31 00:00 |
07:38:53.66 |
+24:35:30.9 |
HIP 37180 |
9.28 |
| 2026-05-31 12:00 |
07:39:00.02 |
+24:35:09.0 |
HIP 37180 |
10.66 |
| 2026-06-01 00:00 |
07:39:06.42 |
+24:34:46.9 |
HIP 37180 |
12.08 |
| 2026-06-01 12:00 |
07:39:12.84 |
+24:34:24.8 |
HIP 37180 |
13.51 |
| 2026-06-02 00:00 |
07:39:19.31 |
+24:34:02.7 |
HIP 37180 |
14.97 |