メタデータ
| 項目 |
値 |
| Designation |
C/2014 F3 (Sheppard-Trujillo) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-05-18T09:14:56.149440Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:14Z |
| Obs used |
100 |
| NEO |
- |
| M1 |
14.400 |
| 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) |
2020-09-10.0000000 |
| e |
0.64217219 |
| q (au) |
5.704144 |
| a (au) |
15.941031 |
| i (deg) |
6.568810 |
| Ω (om, deg) |
326.803827 |
| ω (w, deg) |
2.927768 |
| M (ma, deg) |
356.122619 |
等級
散乱 + 全体線形
$$
M_a = (13.814 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.814 |
| n |
2.000 |
| gf |
0.887 |
| gb |
-0.936 |
| k |
1.000 |
| δ90 |
3.631 |
| 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 |
| 2014-03-26 |
2020-09-16 |
-6.4566 |
+5.035 |
| 2021-07-09 |
2024-11-25 |
-15.6318 |
+11.981 |
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) |
| 2026-05-12 00:00 |
04:36:48.72 |
+27:49:53.4 |
HIP 21510 |
7.23 |
| 2026-05-12 12:00 |
04:37:02.84 |
+27:50:13.6 |
HIP 21510 |
5.50 |
| 2026-05-13 00:00 |
04:37:16.98 |
+27:50:33.8 |
HIP 21531 |
5.22 |
| 2026-05-13 12:00 |
04:37:31.14 |
+27:50:54.0 |
HIP 21531 |
5.53 |
| 2026-05-14 00:00 |
04:37:45.32 |
+27:51:14.4 |
HIP 21531 |
7.33 |
| 2026-05-14 12:00 |
04:37:59.52 |
+27:51:34.8 |
HIP 21531 |
9.84 |
| 2026-05-15 00:00 |
04:38:13.75 |
+27:51:55.3 |
HIP 21531 |
12.65 |
| 2026-05-15 12:00 |
04:38:27.99 |
+27:52:15.9 |
HIP 21531 |
15.60 |
| 2026-05-16 00:00 |
04:38:42.26 |
+27:52:36.5 |
HIP 21699 |
14.06 |
| 2026-05-16 12:00 |
04:38:56.54 |
+27:52:57.2 |
HIP 21699 |
11.49 |
| 2026-05-17 00:00 |
04:39:10.84 |
+27:53:18.0 |
HIP 21699 |
9.30 |
| 2026-05-17 12:00 |
04:39:25.16 |
+27:53:38.8 |
HIP 21699 |
7.81 |
| 2026-05-18 00:00 |
04:39:39.49 |
+27:53:59.7 |
HIP 21699 |
7.48 |
| 2026-05-18 12:00 |
04:39:53.84 |
+27:54:20.7 |
HIP 21699 |
8.43 |
| 2026-05-19 00:00 |
04:40:08.21 |
+27:54:41.7 |
HIP 21699 |
10.32 |
| 2026-05-19 12:00 |
04:40:22.59 |
+27:55:02.8 |
HIP 21699 |
12.75 |
| 2026-05-20 00:00 |
04:40:36.99 |
+27:55:24.0 |
HIP 21699 |
15.46 |
| 2026-05-20 12:00 |
04:40:51.40 |
+27:55:45.2 |
HIP 21699 |
18.33 |
| 2026-05-21 00:00 |
04:41:05.82 |
+27:56:06.4 |
HIP 21699 |
21.29 |
| 2026-05-21 12:00 |
04:41:20.26 |
+27:56:27.8 |
HIP 21699 |
24.32 |
| 2026-05-22 00:00 |
04:41:34.71 |
+27:56:49.1 |
HIP 21699 |
27.40 |
| 2026-05-22 12:00 |
04:41:49.17 |
+27:57:10.5 |
HIP 21988 |
28.36 |
| 2026-05-23 00:00 |
04:42:03.64 |
+27:57:32.0 |
HIP 21988 |
25.99 |
| 2026-05-23 12:00 |
04:42:18.12 |
+27:57:53.5 |
HIP 21988 |
23.83 |
| 2026-05-24 00:00 |
04:42:32.60 |
+27:58:15.1 |
HIP 21988 |
21.92 |
| 2026-05-24 12:00 |
04:42:47.10 |
+27:58:36.7 |
HIP 21988 |
20.35 |
| 2026-05-25 00:00 |
04:43:01.61 |
+27:58:58.4 |
HIP 21988 |
19.20 |
| 2026-05-25 12:00 |
04:43:16.13 |
+27:59:20.1 |
HIP 21988 |
18.55 |
| 2026-05-26 00:00 |
04:43:30.65 |
+27:59:41.8 |
HIP 21988 |
18.44 |
| 2026-05-26 12:00 |
04:43:45.18 |
+28:00:03.6 |
HIP 21988 |
18.90 |
| 2026-05-27 00:00 |
04:43:59.71 |
+28:00:25.5 |
HIP 21988 |
19.88 |
| 2026-05-27 12:00 |
04:44:14.25 |
+28:00:47.3 |
HIP 21988 |
21.31 |
| 2026-05-28 00:00 |
04:44:28.80 |
+28:01:09.2 |
HIP 21988 |
23.11 |
| 2026-05-28 12:00 |
04:44:43.35 |
+28:01:31.2 |
HIP 21988 |
25.20 |
| 2026-05-29 00:00 |
04:44:57.91 |
+28:01:53.2 |
HIP 22207 |
22.42 |
| 2026-05-29 12:00 |
04:45:12.47 |
+28:02:15.2 |
HIP 22207 |
19.59 |
| 2026-05-30 00:00 |
04:45:27.03 |
+28:02:37.3 |
HIP 22207 |
16.91 |
| 2026-05-30 12:00 |
04:45:41.60 |
+28:02:59.4 |
HIP 22207 |
14.45 |
| 2026-05-31 00:00 |
04:45:56.17 |
+28:03:21.5 |
HIP 22207 |
12.37 |
| 2026-05-31 12:00 |
04:46:10.74 |
+28:03:43.6 |
HIP 22207 |
10.86 |
| 2026-06-01 00:00 |
04:46:25.31 |
+28:04:05.8 |
HIP 22207 |
10.20 |
| 2026-06-01 12:00 |
04:46:39.88 |
+28:04:28.0 |
HIP 22207 |
10.53 |
| 2026-06-02 00:00 |
04:46:54.45 |
+28:04:50.3 |
HIP 22207 |
11.79 |