メタデータ
| 項目 |
値 |
| Designation |
C/1987 F1 (Torres) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-04-10T04:42:36.086400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
7.600 |
| 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) |
1988-01-19.0000000 |
| e |
1.00120894 |
| q (au) |
3.624287 |
| a (au) |
-2997.904748 |
| i (deg) |
124.078713 |
| Ω (om, deg) |
194.487430 |
| ω (w, deg) |
329.070992 |
| M (ma, deg) |
0.001704 |
等級
散乱 + 全体線形
$$
M_a = (3.446 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.446 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
02:26:36.24 |
+62:45:31.7 |
HIP 11460 |
11.59 |
| 2026-07-29 12:00 |
02:26:36.34 |
+62:45:51.9 |
HIP 11460 |
11.35 |
| 2026-07-30 00:00 |
02:26:36.41 |
+62:46:12.1 |
HIP 11460 |
11.12 |
| 2026-07-30 12:00 |
02:26:36.44 |
+62:46:32.3 |
HIP 11460 |
10.90 |
| 2026-07-31 00:00 |
02:26:36.45 |
+62:46:52.4 |
HIP 11460 |
10.69 |
| 2026-07-31 12:00 |
02:26:36.42 |
+62:47:12.5 |
HIP 11460 |
10.49 |
| 2026-08-01 00:00 |
02:26:36.36 |
+62:47:32.5 |
HIP 11460 |
10.30 |
| 2026-08-01 12:00 |
02:26:36.26 |
+62:47:52.5 |
HIP 11460 |
10.12 |
| 2026-08-02 00:00 |
02:26:36.13 |
+62:48:12.4 |
HIP 11460 |
9.96 |
| 2026-08-02 12:00 |
02:26:35.97 |
+62:48:32.3 |
HIP 11460 |
9.80 |
| 2026-08-03 00:00 |
02:26:35.78 |
+62:48:52.1 |
HIP 11460 |
9.66 |
| 2026-08-03 12:00 |
02:26:35.55 |
+62:49:11.9 |
HIP 11460 |
9.53 |
| 2026-08-04 00:00 |
02:26:35.29 |
+62:49:31.7 |
HIP 11460 |
9.41 |
| 2026-08-04 12:00 |
02:26:34.99 |
+62:49:51.3 |
HIP 11460 |
9.31 |
| 2026-08-05 00:00 |
02:26:34.66 |
+62:50:10.9 |
HIP 11460 |
9.23 |
| 2026-08-05 12:00 |
02:26:34.30 |
+62:50:30.5 |
HIP 11460 |
9.15 |
| 2026-08-06 00:00 |
02:26:33.91 |
+62:50:50.0 |
HIP 11460 |
9.10 |
| 2026-08-06 12:00 |
02:26:33.48 |
+62:51:09.5 |
HIP 11460 |
9.06 |
| 2026-08-07 00:00 |
02:26:33.02 |
+62:51:28.8 |
HIP 11460 |
9.03 |
| 2026-08-07 12:00 |
02:26:32.53 |
+62:51:48.2 |
HIP 11460 |
9.02 |
| 2026-08-08 00:00 |
02:26:32.00 |
+62:52:07.4 |
HIP 11460 |
9.03 |
| 2026-08-08 12:00 |
02:26:31.44 |
+62:52:26.6 |
HIP 11460 |
9.05 |
| 2026-08-09 00:00 |
02:26:30.84 |
+62:52:45.7 |
HIP 11460 |
9.09 |
| 2026-08-09 12:00 |
02:26:30.21 |
+62:53:04.8 |
HIP 11460 |
9.14 |
| 2026-08-10 00:00 |
02:26:29.55 |
+62:53:23.8 |
HIP 11460 |
9.21 |
| 2026-08-10 12:00 |
02:26:28.86 |
+62:53:42.7 |
HIP 11460 |
9.29 |
| 2026-08-11 00:00 |
02:26:28.13 |
+62:54:01.5 |
HIP 11460 |
9.38 |
| 2026-08-11 12:00 |
02:26:27.36 |
+62:54:20.3 |
HIP 11460 |
9.49 |
| 2026-08-12 00:00 |
02:26:26.57 |
+62:54:38.9 |
HIP 11460 |
9.62 |
| 2026-08-12 12:00 |
02:26:25.74 |
+62:54:57.5 |
HIP 11460 |
9.75 |
| 2026-08-13 00:00 |
02:26:24.87 |
+62:55:16.0 |
HIP 11460 |
9.90 |
| 2026-08-13 12:00 |
02:26:23.98 |
+62:55:34.5 |
HIP 11460 |
10.06 |
| 2026-08-14 00:00 |
02:26:23.05 |
+62:55:52.8 |
HIP 11460 |
10.23 |
| 2026-08-14 12:00 |
02:26:22.08 |
+62:56:11.1 |
HIP 11460 |
10.42 |
| 2026-08-15 00:00 |
02:26:21.09 |
+62:56:29.3 |
HIP 11460 |
10.61 |
| 2026-08-15 12:00 |
02:26:20.06 |
+62:56:47.4 |
HIP 11460 |
10.81 |
| 2026-08-16 00:00 |
02:26:18.99 |
+62:57:05.4 |
HIP 11460 |
11.02 |
| 2026-08-16 12:00 |
02:26:17.90 |
+62:57:23.3 |
HIP 11460 |
11.24 |
| 2026-08-17 00:00 |
02:26:16.77 |
+62:57:41.1 |
HIP 11460 |
11.46 |
| 2026-08-17 12:00 |
02:26:15.60 |
+62:57:58.8 |
HIP 11460 |
11.70 |
| 2026-08-18 00:00 |
02:26:14.41 |
+62:58:16.4 |
HIP 11460 |
11.94 |
| 2026-08-18 12:00 |
02:26:13.18 |
+62:58:34.0 |
HIP 11460 |
12.18 |
| 2026-08-19 00:00 |
02:26:11.92 |
+62:58:51.4 |
HIP 11460 |
12.44 |