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 |
0.999 |
| 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) |
| 2026-06-01 00:00 |
21:16:22.68 |
+62:15:45.3 |
HIP 104912 |
15.44 |
| 2026-06-01 12:00 |
21:16:20.37 |
+62:16:16.7 |
HIP 104912 |
14.86 |
| 2026-06-02 00:00 |
21:16:18.03 |
+62:16:47.9 |
HIP 104912 |
14.28 |
| 2026-06-02 12:00 |
21:16:15.64 |
+62:17:18.9 |
HIP 104912 |
13.70 |
| 2026-06-03 00:00 |
21:16:13.22 |
+62:17:49.8 |
HIP 104912 |
13.12 |
| 2026-06-03 12:00 |
21:16:10.76 |
+62:18:20.6 |
HIP 104912 |
12.54 |
| 2026-06-04 00:00 |
21:16:08.25 |
+62:18:51.2 |
HIP 104912 |
11.96 |
| 2026-06-04 12:00 |
21:16:05.71 |
+62:19:21.7 |
HIP 104912 |
11.38 |
| 2026-06-05 00:00 |
21:16:03.13 |
+62:19:52.0 |
HIP 104912 |
10.80 |
| 2026-06-05 12:00 |
21:16:00.51 |
+62:20:22.1 |
HIP 104912 |
10.22 |
| 2026-06-06 00:00 |
21:15:57.85 |
+62:20:52.1 |
HIP 104912 |
9.63 |
| 2026-06-06 12:00 |
21:15:55.15 |
+62:21:22.0 |
HIP 104912 |
9.05 |
| 2026-06-07 00:00 |
21:15:52.41 |
+62:21:51.6 |
HIP 104912 |
8.47 |
| 2026-06-07 12:00 |
21:15:49.63 |
+62:22:21.1 |
HIP 104912 |
7.89 |
| 2026-06-08 00:00 |
21:15:46.82 |
+62:22:50.5 |
HIP 104912 |
7.31 |
| 2026-06-08 12:00 |
21:15:43.96 |
+62:23:19.6 |
HIP 104912 |
6.72 |
| 2026-06-09 00:00 |
21:15:41.07 |
+62:23:48.6 |
HIP 104912 |
6.14 |
| 2026-06-09 12:00 |
21:15:38.14 |
+62:24:17.4 |
HIP 104912 |
5.56 |
| 2026-06-10 00:00 |
21:15:35.17 |
+62:24:46.0 |
HIP 104912 |
4.98 |
| 2026-06-10 12:00 |
21:15:32.16 |
+62:25:14.5 |
HIP 104912 |
4.40 |
| 2026-06-11 00:00 |
21:15:29.12 |
+62:25:42.8 |
HIP 104912 |
3.82 |
| 2026-06-11 12:00 |
21:15:26.04 |
+62:26:10.9 |
HIP 104912 |
3.25 |
| 2026-06-12 00:00 |
21:15:22.92 |
+62:26:38.8 |
HIP 104912 |
2.68 |
| 2026-06-12 12:00 |
21:15:19.76 |
+62:27:06.5 |
HIP 104912 |
2.11 |
| 2026-06-13 00:00 |
21:15:16.57 |
+62:27:34.0 |
HIP 104912 |
1.57 |
| 2026-06-13 12:00 |
21:15:13.34 |
+62:28:01.3 |
HIP 104912 |
1.06 |
| 2026-06-14 00:00 |
21:15:10.07 |
+62:28:28.5 |
HIP 104912 |
0.69 |
| 2026-06-14 12:00 |
21:15:06.77 |
+62:28:55.4 |
HIP 104912 |
0.73 |
| 2026-06-15 00:00 |
21:15:03.43 |
+62:29:22.1 |
HIP 104912 |
1.12 |
| 2026-06-15 12:00 |
21:15:00.05 |
+62:29:48.6 |
HIP 104912 |
1.64 |
| 2026-06-16 00:00 |
21:14:56.64 |
+62:30:15.0 |
HIP 104912 |
2.19 |
| 2026-06-16 12:00 |
21:14:53.20 |
+62:30:41.1 |
HIP 104912 |
2.76 |
| 2026-06-17 00:00 |
21:14:49.71 |
+62:31:07.0 |
HIP 104912 |
3.33 |
| 2026-06-17 12:00 |
21:14:46.20 |
+62:31:32.7 |
HIP 104912 |
3.91 |
| 2026-06-18 00:00 |
21:14:42.64 |
+62:31:58.1 |
HIP 104912 |
4.49 |
| 2026-06-18 12:00 |
21:14:39.06 |
+62:32:23.4 |
HIP 104912 |
5.07 |
| 2026-06-19 00:00 |
21:14:35.44 |
+62:32:48.4 |
HIP 104912 |
5.65 |
| 2026-06-19 12:00 |
21:14:31.78 |
+62:33:13.3 |
HIP 104912 |
6.23 |
| 2026-06-20 00:00 |
21:14:28.09 |
+62:33:37.9 |
HIP 104912 |
6.82 |
| 2026-06-20 12:00 |
21:14:24.37 |
+62:34:02.2 |
HIP 104912 |
7.40 |
| 2026-06-21 00:00 |
21:14:20.62 |
+62:34:26.4 |
HIP 104912 |
7.99 |
| 2026-06-21 12:00 |
21:14:16.83 |
+62:34:50.3 |
HIP 104912 |
8.57 |
| 2026-06-22 00:00 |
21:14:13.01 |
+62:35:14.0 |
HIP 104912 |
9.16 |