C/1987 F1 (Torres)
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) |
| 2026-02-03 00:00 |
02:11:45.55 |
+62:24:28.7 |
HIP 10294 |
5.97 |
| 2026-02-03 12:00 |
02:11:46.07 |
+62:24:06.3 |
HIP 10294 |
5.81 |
| 2026-02-04 00:00 |
02:11:46.62 |
+62:23:44.1 |
HIP 10294 |
5.67 |
| 2026-02-04 12:00 |
02:11:47.21 |
+62:23:21.9 |
HIP 10294 |
5.55 |
| 2026-02-05 00:00 |
02:11:47.83 |
+62:22:59.9 |
HIP 10294 |
5.44 |
| 2026-02-05 12:00 |
02:11:48.48 |
+62:22:37.9 |
HIP 10294 |
5.36 |
| 2026-02-06 00:00 |
02:11:49.17 |
+62:22:16.0 |
HIP 10294 |
5.30 |
| 2026-02-06 12:00 |
02:11:49.89 |
+62:21:54.3 |
HIP 10294 |
5.26 |
| 2026-02-07 00:00 |
02:11:50.65 |
+62:21:32.6 |
HIP 10294 |
5.24 |
| 2026-02-07 12:00 |
02:11:51.44 |
+62:21:11.0 |
HIP 10294 |
5.24 |
| 2026-02-08 00:00 |
02:11:52.26 |
+62:20:49.6 |
HIP 10294 |
5.26 |
| 2026-02-08 12:00 |
02:11:53.12 |
+62:20:28.2 |
HIP 10294 |
5.31 |
| 2026-02-09 00:00 |
02:11:54.01 |
+62:20:06.9 |
HIP 10294 |
5.38 |
| 2026-02-09 12:00 |
02:11:54.93 |
+62:19:45.8 |
HIP 10294 |
5.47 |
| 2026-02-10 00:00 |
02:11:55.88 |
+62:19:24.7 |
HIP 10294 |
5.57 |
| 2026-02-10 12:00 |
02:11:56.87 |
+62:19:03.8 |
HIP 10294 |
5.70 |
| 2026-02-11 00:00 |
02:11:57.89 |
+62:18:43.0 |
HIP 10294 |
5.84 |
| 2026-02-11 12:00 |
02:11:58.95 |
+62:18:22.3 |
HIP 10294 |
5.99 |
| 2026-02-12 00:00 |
02:12:00.03 |
+62:18:01.7 |
HIP 10294 |
6.16 |
| 2026-02-12 12:00 |
02:12:01.15 |
+62:17:41.2 |
HIP 10294 |
6.34 |
| 2026-02-13 00:00 |
02:12:02.30 |
+62:17:20.9 |
HIP 10294 |
6.53 |
| 2026-02-13 12:00 |
02:12:03.49 |
+62:17:00.6 |
HIP 10294 |
6.74 |
| 2026-02-14 00:00 |
02:12:04.70 |
+62:16:40.5 |
HIP 10294 |
6.95 |
| 2026-02-14 12:00 |
02:12:05.95 |
+62:16:20.5 |
HIP 10294 |
7.17 |
| 2026-02-15 00:00 |
02:12:07.23 |
+62:16:00.7 |
HIP 10294 |
7.40 |
| 2026-02-15 12:00 |
02:12:08.54 |
+62:15:40.9 |
HIP 10294 |
7.64 |
| 2026-02-16 00:00 |
02:12:09.89 |
+62:15:21.3 |
HIP 10294 |
7.88 |
| 2026-02-16 12:00 |
02:12:11.26 |
+62:15:01.8 |
HIP 10294 |
8.13 |
| 2026-02-17 00:00 |
02:12:12.67 |
+62:14:42.5 |
HIP 10294 |
8.38 |
| 2026-02-17 12:00 |
02:12:14.11 |
+62:14:23.2 |
HIP 10294 |
8.64 |
| 2026-02-18 00:00 |
02:12:15.57 |
+62:14:04.1 |
HIP 10294 |
8.90 |
| 2026-02-18 12:00 |
02:12:17.07 |
+62:13:45.2 |
HIP 10294 |
9.17 |
| 2026-02-19 00:00 |
02:12:18.60 |
+62:13:26.3 |
HIP 10294 |
9.44 |
| 2026-02-19 12:00 |
02:12:20.16 |
+62:13:07.6 |
HIP 10294 |
9.71 |
| 2026-02-20 00:00 |
02:12:21.76 |
+62:12:49.1 |
HIP 10294 |
9.99 |
| 2026-02-20 12:00 |
02:12:23.38 |
+62:12:30.7 |
HIP 10294 |
10.27 |
| 2026-02-21 00:00 |
02:12:25.03 |
+62:12:12.4 |
HIP 10294 |
10.55 |
| 2026-02-21 12:00 |
02:12:26.71 |
+62:11:54.3 |
HIP 10294 |
10.83 |
| 2026-02-22 00:00 |
02:12:28.42 |
+62:11:36.3 |
HIP 10294 |
11.11 |
| 2026-02-22 12:00 |
02:12:30.16 |
+62:11:18.4 |
HIP 10294 |
11.40 |
| 2026-02-23 00:00 |
02:12:31.93 |
+62:11:00.7 |
HIP 10294 |
11.68 |
| 2026-02-23 12:00 |
02:12:33.73 |
+62:10:43.1 |
HIP 10294 |
11.97 |
| 2026-02-24 00:00 |
02:12:35.56 |
+62:10:25.7 |
HIP 10294 |
12.26 |