メタデータ
| 項目 |
値 |
| Designation |
C/2002 F1 (Utsunomiya) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-04-22T21:33:43.323840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:15Z |
| Obs used |
161 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
18.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-04-05.0000000 |
| e |
0.99953997 |
| q (au) |
0.438299 |
| a (au) |
952.755523 |
| i (deg) |
80.876930 |
| Ω (om, deg) |
289.029545 |
| ω (w, deg) |
125.900029 |
| M (ma, deg) |
359.999400 |
等級
散乱 + 全体線形
$$
M_a = (9.274 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.274 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.973 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2002-03-20 |
2002-04-04 |
-4.1418 |
-0.069 |
| 2002-04-04 |
2002-04-14 |
+15.8305 |
+4.380 |
| 2002-04-14 |
2002-04-22 |
-15.9612 |
-5.633 |
| 2002-04-23 |
2002-06-02 |
-3.3496 |
-1.321 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
16:36:22.83 |
-86:53:53.8 |
HIP 82459 |
18.34 |
| 2026-09-20 12:00 |
16:36:37.29 |
-86:53:21.1 |
HIP 82459 |
18.67 |
| 2026-09-21 00:00 |
16:36:52.03 |
-86:52:48.5 |
HIP 82459 |
19.00 |
| 2026-09-21 12:00 |
16:37:07.07 |
-86:52:16.0 |
HIP 82459 |
19.34 |
| 2026-09-22 00:00 |
16:37:22.38 |
-86:51:43.6 |
HIP 82459 |
19.68 |
| 2026-09-22 12:00 |
16:37:37.98 |
-86:51:11.3 |
HIP 82459 |
20.03 |
| 2026-09-23 00:00 |
16:37:53.85 |
-86:50:39.1 |
HIP 82459 |
20.39 |
| 2026-09-23 12:00 |
16:38:10.00 |
-86:50:07.0 |
HIP 82459 |
20.76 |
| 2026-09-24 00:00 |
16:38:26.42 |
-86:49:35.1 |
HIP 82459 |
21.13 |
| 2026-09-24 12:00 |
16:38:43.11 |
-86:49:03.2 |
HIP 82459 |
21.50 |
| 2026-09-25 00:00 |
16:39:00.06 |
-86:48:31.4 |
HIP 82459 |
21.88 |
| 2026-09-25 12:00 |
16:39:17.27 |
-86:47:59.8 |
HIP 82459 |
22.27 |
| 2026-09-26 00:00 |
16:39:34.74 |
-86:47:28.2 |
HIP 82459 |
22.66 |
| 2026-09-26 12:00 |
16:39:52.47 |
-86:46:56.8 |
HIP 82459 |
23.05 |
| 2026-09-27 00:00 |
16:40:10.45 |
-86:46:25.5 |
HIP 82459 |
23.45 |
| 2026-09-27 12:00 |
16:40:28.69 |
-86:45:54.3 |
HIP 82459 |
23.85 |
| 2026-09-28 00:00 |
16:40:47.17 |
-86:45:23.2 |
HIP 82459 |
24.25 |
| 2026-09-28 12:00 |
16:41:05.90 |
-86:44:52.3 |
HIP 82459 |
24.66 |
| 2026-09-29 00:00 |
16:41:24.87 |
-86:44:21.4 |
HIP 82459 |
25.07 |
| 2026-09-29 12:00 |
16:41:44.08 |
-86:43:50.7 |
HIP 82459 |
25.49 |
| 2026-09-30 00:00 |
16:42:03.53 |
-86:43:20.1 |
HIP 82459 |
25.91 |
| 2026-09-30 12:00 |
16:42:23.22 |
-86:42:49.6 |
HIP 82459 |
26.32 |
| 2026-10-01 00:00 |
16:42:43.14 |
-86:42:19.2 |
HIP 83255 |
26.30 |
| 2026-10-01 12:00 |
16:43:03.29 |
-86:41:49.0 |
HIP 83255 |
25.73 |
| 2026-10-02 00:00 |
16:43:23.68 |
-86:41:18.9 |
HIP 83255 |
25.16 |
| 2026-10-02 12:00 |
16:43:44.29 |
-86:40:48.9 |
HIP 83255 |
24.59 |
| 2026-10-03 00:00 |
16:44:05.12 |
-86:40:19.0 |
HIP 83255 |
24.02 |
| 2026-10-03 12:00 |
16:44:26.18 |
-86:39:49.3 |
HIP 83255 |
23.44 |
| 2026-10-04 00:00 |
16:44:47.46 |
-86:39:19.6 |
HIP 83255 |
22.87 |
| 2026-10-04 12:00 |
16:45:08.96 |
-86:38:50.2 |
HIP 83255 |
22.30 |
| 2026-10-05 00:00 |
16:45:30.68 |
-86:38:20.8 |
HIP 83255 |
21.72 |
| 2026-10-05 12:00 |
16:45:52.61 |
-86:37:51.6 |
HIP 83255 |
21.14 |
| 2026-10-06 00:00 |
16:46:14.75 |
-86:37:22.5 |
HIP 83255 |
20.57 |
| 2026-10-06 12:00 |
16:46:37.11 |
-86:36:53.5 |
HIP 83255 |
19.99 |
| 2026-10-07 00:00 |
16:46:59.67 |
-86:36:24.7 |
HIP 83255 |
19.41 |
| 2026-10-07 12:00 |
16:47:22.43 |
-86:35:56.0 |
HIP 83255 |
18.83 |
| 2026-10-08 00:00 |
16:47:45.41 |
-86:35:27.5 |
HIP 83255 |
18.25 |
| 2026-10-08 12:00 |
16:48:08.58 |
-86:34:59.1 |
HIP 83255 |
17.67 |
| 2026-10-09 00:00 |
16:48:31.95 |
-86:34:30.8 |
HIP 83255 |
17.09 |
| 2026-10-09 12:00 |
16:48:55.52 |
-86:34:02.7 |
HIP 83255 |
16.51 |
| 2026-10-10 00:00 |
16:49:19.29 |
-86:33:34.7 |
HIP 83255 |
15.93 |
| 2026-10-10 12:00 |
16:49:43.24 |
-86:33:06.9 |
HIP 83255 |
15.34 |
| 2026-10-11 00:00 |
16:50:07.39 |
-86:32:39.2 |
HIP 83255 |
14.76 |