メタデータ
| 項目 |
値 |
| Designation |
C/2000 J1 (Ferris) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-05-11T07:12:19.716480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-05-11.0000000 |
| e |
0.95426363 |
| q (au) |
2.542550 |
| a (au) |
55.591420 |
| i (deg) |
98.794665 |
| Ω (om, deg) |
28.440310 |
| ω (w, deg) |
147.219674 |
| M (ma, deg) |
359.999286 |
等級
散乱 + 全体線形
$$
M_a = (18.720 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.720 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.872 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
03:41:14.45 |
-35:44:06.9 |
HIP 17219 |
17.87 |
| 2026-03-26 12:00 |
03:41:16.35 |
-35:43:34.5 |
HIP 17219 |
17.32 |
| 2026-03-27 00:00 |
03:41:18.27 |
-35:43:02.2 |
HIP 17219 |
16.78 |
| 2026-03-27 12:00 |
03:41:20.21 |
-35:42:30.1 |
HIP 17219 |
16.25 |
| 2026-03-28 00:00 |
03:41:22.18 |
-35:41:58.2 |
HIP 17219 |
15.74 |
| 2026-03-28 12:00 |
03:41:24.16 |
-35:41:26.4 |
HIP 17219 |
15.24 |
| 2026-03-29 00:00 |
03:41:26.17 |
-35:40:54.7 |
HIP 17219 |
14.76 |
| 2026-03-29 12:00 |
03:41:28.20 |
-35:40:23.2 |
HIP 17219 |
14.29 |
| 2026-03-30 00:00 |
03:41:30.24 |
-35:39:51.9 |
HIP 17219 |
13.85 |
| 2026-03-30 12:00 |
03:41:32.31 |
-35:39:20.8 |
HIP 17219 |
13.43 |
| 2026-03-31 00:00 |
03:41:34.40 |
-35:38:49.8 |
HIP 17219 |
13.03 |
| 2026-03-31 12:00 |
03:41:36.51 |
-35:38:18.9 |
HIP 17219 |
12.66 |
| 2026-04-01 00:00 |
03:41:38.64 |
-35:37:48.3 |
HIP 17219 |
12.32 |
| 2026-04-01 12:00 |
03:41:40.79 |
-35:37:17.8 |
HIP 17219 |
12.01 |
| 2026-04-02 00:00 |
03:41:42.96 |
-35:36:47.5 |
HIP 17219 |
11.73 |
| 2026-04-02 12:00 |
03:41:45.14 |
-35:36:17.4 |
HIP 17219 |
11.50 |
| 2026-04-03 00:00 |
03:41:47.35 |
-35:35:47.4 |
HIP 17219 |
11.30 |
| 2026-04-03 12:00 |
03:41:49.58 |
-35:35:17.6 |
HIP 17219 |
11.14 |
| 2026-04-04 00:00 |
03:41:51.82 |
-35:34:48.0 |
HIP 17219 |
11.03 |
| 2026-04-04 12:00 |
03:41:54.09 |
-35:34:18.6 |
HIP 17219 |
10.96 |
| 2026-04-05 00:00 |
03:41:56.37 |
-35:33:49.3 |
HIP 17219 |
10.94 |
| 2026-04-05 12:00 |
03:41:58.67 |
-35:33:20.3 |
HIP 17219 |
10.97 |
| 2026-04-06 00:00 |
03:42:00.99 |
-35:32:51.4 |
HIP 17219 |
11.04 |
| 2026-04-06 12:00 |
03:42:03.33 |
-35:32:22.7 |
HIP 17219 |
11.15 |
| 2026-04-07 00:00 |
03:42:05.69 |
-35:31:54.2 |
HIP 17219 |
11.31 |
| 2026-04-07 12:00 |
03:42:08.06 |
-35:31:25.9 |
HIP 17219 |
11.51 |
| 2026-04-08 00:00 |
03:42:10.45 |
-35:30:57.8 |
HIP 17219 |
11.76 |
| 2026-04-08 12:00 |
03:42:12.86 |
-35:30:29.9 |
HIP 17219 |
12.04 |
| 2026-04-09 00:00 |
03:42:15.29 |
-35:30:02.2 |
HIP 17219 |
12.35 |
| 2026-04-09 12:00 |
03:42:17.73 |
-35:29:34.7 |
HIP 17219 |
12.70 |
| 2026-04-10 00:00 |
03:42:20.19 |
-35:29:07.4 |
HIP 17219 |
13.08 |
| 2026-04-10 12:00 |
03:42:22.67 |
-35:28:40.2 |
HIP 17219 |
13.48 |
| 2026-04-11 00:00 |
03:42:25.17 |
-35:28:13.3 |
HIP 17219 |
13.91 |
| 2026-04-11 12:00 |
03:42:27.68 |
-35:27:46.6 |
HIP 17219 |
14.37 |
| 2026-04-12 00:00 |
03:42:30.20 |
-35:27:20.1 |
HIP 17219 |
14.84 |
| 2026-04-12 12:00 |
03:42:32.75 |
-35:26:53.8 |
HIP 17219 |
15.33 |
| 2026-04-13 00:00 |
03:42:35.30 |
-35:26:27.7 |
HIP 17219 |
15.84 |
| 2026-04-13 12:00 |
03:42:37.88 |
-35:26:01.8 |
HIP 17219 |
16.37 |
| 2026-04-14 00:00 |
03:42:40.47 |
-35:25:36.2 |
HIP 17219 |
16.91 |
| 2026-04-14 12:00 |
03:42:43.07 |
-35:25:10.7 |
HIP 17219 |
17.46 |
| 2026-04-15 00:00 |
03:42:45.69 |
-35:24:45.5 |
HIP 17219 |
18.02 |
| 2026-04-15 12:00 |
03:42:48.33 |
-35:24:20.5 |
HIP 17219 |
18.60 |
| 2026-04-16 00:00 |
03:42:50.98 |
-35:23:55.7 |
HIP 17219 |
19.18 |