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 |
-0.501 |
| 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 |
02:20:49.74 |
+62:00:10.3 |
HIP 11118 |
19.98 |
| 2026-05-12 12:00 |
02:20:53.37 |
+62:00:19.9 |
HIP 11118 |
19.55 |
| 2026-05-13 00:00 |
02:20:57.00 |
+62:00:29.6 |
HIP 11118 |
19.12 |
| 2026-05-13 12:00 |
02:21:00.61 |
+62:00:39.6 |
HIP 11118 |
18.70 |
| 2026-05-14 00:00 |
02:21:04.22 |
+62:00:49.6 |
HIP 11118 |
18.27 |
| 2026-05-14 12:00 |
02:21:07.82 |
+62:00:59.9 |
HIP 11118 |
17.84 |
| 2026-05-15 00:00 |
02:21:11.42 |
+62:01:10.2 |
HIP 11118 |
17.41 |
| 2026-05-15 12:00 |
02:21:15.00 |
+62:01:20.8 |
HIP 11118 |
16.99 |
| 2026-05-16 00:00 |
02:21:18.58 |
+62:01:31.5 |
HIP 11118 |
16.56 |
| 2026-05-16 12:00 |
02:21:22.14 |
+62:01:42.3 |
HIP 11118 |
16.14 |
| 2026-05-17 00:00 |
02:21:25.70 |
+62:01:53.3 |
HIP 11118 |
15.71 |
| 2026-05-17 12:00 |
02:21:29.25 |
+62:02:04.4 |
HIP 11118 |
15.29 |
| 2026-05-18 00:00 |
02:21:32.79 |
+62:02:15.7 |
HIP 11118 |
14.86 |
| 2026-05-18 12:00 |
02:21:36.31 |
+62:02:27.1 |
HIP 11118 |
14.44 |
| 2026-05-19 00:00 |
02:21:39.83 |
+62:02:38.7 |
HIP 11118 |
14.02 |
| 2026-05-19 12:00 |
02:21:43.34 |
+62:02:50.4 |
HIP 11118 |
13.60 |
| 2026-05-20 00:00 |
02:21:46.83 |
+62:03:02.3 |
HIP 11118 |
13.18 |
| 2026-05-20 12:00 |
02:21:50.32 |
+62:03:14.3 |
HIP 11118 |
12.77 |
| 2026-05-21 00:00 |
02:21:53.79 |
+62:03:26.4 |
HIP 11118 |
12.35 |
| 2026-05-21 12:00 |
02:21:57.25 |
+62:03:38.7 |
HIP 11118 |
11.94 |
| 2026-05-22 00:00 |
02:22:00.70 |
+62:03:51.1 |
HIP 11118 |
11.52 |
| 2026-05-22 12:00 |
02:22:04.14 |
+62:04:03.7 |
HIP 11118 |
11.12 |
| 2026-05-23 00:00 |
02:22:07.57 |
+62:04:16.4 |
HIP 11118 |
10.71 |
| 2026-05-23 12:00 |
02:22:10.98 |
+62:04:29.2 |
HIP 11118 |
10.31 |
| 2026-05-24 00:00 |
02:22:14.38 |
+62:04:42.2 |
HIP 11118 |
9.90 |
| 2026-05-24 12:00 |
02:22:17.77 |
+62:04:55.3 |
HIP 11118 |
9.51 |
| 2026-05-25 00:00 |
02:22:21.15 |
+62:05:08.5 |
HIP 11118 |
9.11 |
| 2026-05-25 12:00 |
02:22:24.51 |
+62:05:21.9 |
HIP 11118 |
8.73 |
| 2026-05-26 00:00 |
02:22:27.85 |
+62:05:35.4 |
HIP 11118 |
8.34 |
| 2026-05-26 12:00 |
02:22:31.19 |
+62:05:49.0 |
HIP 11118 |
7.97 |
| 2026-05-27 00:00 |
02:22:34.51 |
+62:06:02.8 |
HIP 11118 |
7.59 |
| 2026-05-27 12:00 |
02:22:37.82 |
+62:06:16.7 |
HIP 11118 |
7.23 |
| 2026-05-28 00:00 |
02:22:41.11 |
+62:06:30.7 |
HIP 11118 |
6.88 |
| 2026-05-28 12:00 |
02:22:44.38 |
+62:06:44.8 |
HIP 11118 |
6.53 |
| 2026-05-29 00:00 |
02:22:47.65 |
+62:06:59.1 |
HIP 11118 |
6.20 |
| 2026-05-29 12:00 |
02:22:50.89 |
+62:07:13.4 |
HIP 11118 |
5.88 |
| 2026-05-30 00:00 |
02:22:54.13 |
+62:07:28.0 |
HIP 11118 |
5.58 |
| 2026-05-30 12:00 |
02:22:57.34 |
+62:07:42.6 |
HIP 11118 |
5.30 |
| 2026-05-31 00:00 |
02:23:00.54 |
+62:07:57.3 |
HIP 11118 |
5.04 |
| 2026-05-31 12:00 |
02:23:03.73 |
+62:08:12.2 |
HIP 11118 |
4.80 |
| 2026-06-01 00:00 |
02:23:06.90 |
+62:08:27.2 |
HIP 11118 |
4.60 |
| 2026-06-01 12:00 |
02:23:10.05 |
+62:08:42.3 |
HIP 11118 |
4.42 |
| 2026-06-02 00:00 |
02:23:13.19 |
+62:08:57.5 |
HIP 11118 |
4.29 |