C/1999 U1 (Ferris)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 U1 (Ferris) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-09-03T07:06:12.075840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
208 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-11-14.0000000 |
| e |
1.00340647 |
| q (au) |
4.139123 |
| a (au) |
-1215.077481 |
| i (deg) |
105.745305 |
| Ω (om, deg) |
58.256738 |
| ω (w, deg) |
291.117936 |
| M (ma, deg) |
0.010162 |
等級
散乱 + 全体線形
$$
M_a = (10.325 + 2.084\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.325 |
| n |
2.084 |
| gf |
0.997 |
| gb |
-0.920 |
| k |
0.999 |
| 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 |
21:08:26.16 |
+60:34:31.5 |
HIP 104247 |
9.05 |
| 2026-02-03 12:00 |
21:08:30.79 |
+60:34:32.7 |
HIP 104247 |
9.61 |
| 2026-02-04 00:00 |
21:08:35.41 |
+60:34:34.3 |
HIP 104247 |
10.17 |
| 2026-02-04 12:00 |
21:08:40.04 |
+60:34:36.2 |
HIP 104247 |
10.73 |
| 2026-02-05 00:00 |
21:08:44.66 |
+60:34:38.4 |
HIP 104247 |
11.30 |
| 2026-02-05 12:00 |
21:08:49.29 |
+60:34:40.9 |
HIP 104247 |
11.86 |
| 2026-02-06 00:00 |
21:08:53.91 |
+60:34:43.7 |
HIP 104247 |
12.43 |
| 2026-02-06 12:00 |
21:08:58.53 |
+60:34:46.8 |
HIP 104247 |
13.00 |
| 2026-02-07 00:00 |
21:09:03.15 |
+60:34:50.2 |
HIP 104247 |
13.56 |
| 2026-02-07 12:00 |
21:09:07.76 |
+60:34:54.0 |
HIP 104247 |
14.13 |
| 2026-02-08 00:00 |
21:09:12.37 |
+60:34:58.0 |
HIP 104247 |
14.70 |
| 2026-02-08 12:00 |
21:09:16.98 |
+60:35:02.4 |
HIP 104247 |
15.27 |
| 2026-02-09 00:00 |
21:09:21.59 |
+60:35:07.0 |
HIP 104247 |
15.84 |
| 2026-02-09 12:00 |
21:09:26.19 |
+60:35:12.0 |
HIP 104247 |
16.41 |
| 2026-02-10 00:00 |
21:09:30.79 |
+60:35:17.3 |
HIP 104247 |
16.99 |
| 2026-02-10 12:00 |
21:09:35.38 |
+60:35:22.9 |
HIP 104247 |
17.56 |
| 2026-02-11 00:00 |
21:09:39.97 |
+60:35:28.8 |
HIP 104247 |
18.13 |
| 2026-02-11 12:00 |
21:09:44.55 |
+60:35:35.0 |
HIP 104422 |
18.56 |
| 2026-02-12 00:00 |
21:09:49.13 |
+60:35:41.5 |
HIP 104422 |
18.58 |
| 2026-02-12 12:00 |
21:09:53.70 |
+60:35:48.3 |
HIP 104422 |
18.62 |
| 2026-02-13 00:00 |
21:09:58.26 |
+60:35:55.4 |
HIP 104422 |
18.68 |
| 2026-02-13 12:00 |
21:10:02.82 |
+60:36:02.8 |
HIP 104422 |
18.74 |
| 2026-02-14 00:00 |
21:10:07.37 |
+60:36:10.6 |
HIP 104422 |
18.82 |
| 2026-02-14 12:00 |
21:10:11.91 |
+60:36:18.6 |
HIP 104422 |
18.91 |
| 2026-02-15 00:00 |
21:10:16.45 |
+60:36:26.9 |
HIP 104422 |
19.01 |
| 2026-02-15 12:00 |
21:10:20.98 |
+60:36:35.5 |
HIP 104723 |
18.99 |
| 2026-02-16 00:00 |
21:10:25.50 |
+60:36:44.5 |
HIP 104723 |
18.42 |
| 2026-02-16 12:00 |
21:10:30.01 |
+60:36:53.7 |
HIP 104723 |
17.85 |
| 2026-02-17 00:00 |
21:10:34.51 |
+60:37:03.2 |
HIP 104723 |
17.27 |
| 2026-02-17 12:00 |
21:10:39.00 |
+60:37:13.1 |
HIP 104723 |
16.70 |
| 2026-02-18 00:00 |
21:10:43.48 |
+60:37:23.2 |
HIP 104723 |
16.12 |
| 2026-02-18 12:00 |
21:10:47.96 |
+60:37:33.6 |
HIP 104723 |
15.55 |
| 2026-02-19 00:00 |
21:10:52.42 |
+60:37:44.3 |
HIP 104723 |
14.97 |
| 2026-02-19 12:00 |
21:10:56.87 |
+60:37:55.3 |
HIP 104723 |
14.40 |
| 2026-02-20 00:00 |
21:11:01.31 |
+60:38:06.6 |
HIP 104723 |
13.82 |
| 2026-02-20 12:00 |
21:11:05.74 |
+60:38:18.2 |
HIP 104723 |
13.25 |
| 2026-02-21 00:00 |
21:11:10.15 |
+60:38:30.1 |
HIP 104723 |
12.67 |
| 2026-02-21 12:00 |
21:11:14.56 |
+60:38:42.3 |
HIP 104723 |
12.10 |
| 2026-02-22 00:00 |
21:11:18.95 |
+60:38:54.8 |
HIP 104723 |
11.53 |
| 2026-02-22 12:00 |
21:11:23.33 |
+60:39:07.5 |
HIP 104723 |
10.95 |
| 2026-02-23 00:00 |
21:11:27.69 |
+60:39:20.6 |
HIP 104723 |
10.38 |
| 2026-02-23 12:00 |
21:11:32.05 |
+60:39:33.9 |
HIP 104723 |
9.81 |
| 2026-02-24 00:00 |
21:11:36.38 |
+60:39:47.5 |
HIP 104723 |
9.24 |