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) |
| 2026-07-29 00:00 |
16:52:22.31 |
-87:53:25.5 |
HIP 84461 |
23.99 |
| 2026-07-29 12:00 |
16:51:41.27 |
-87:52:56.5 |
HIP 84461 |
23.86 |
| 2026-07-30 00:00 |
16:51:00.98 |
-87:52:27.3 |
HIP 84461 |
23.74 |
| 2026-07-30 12:00 |
16:50:21.47 |
-87:51:57.9 |
HIP 84461 |
23.63 |
| 2026-07-31 00:00 |
16:49:42.71 |
-87:51:28.2 |
HIP 84461 |
23.53 |
| 2026-07-31 12:00 |
16:49:04.72 |
-87:50:58.3 |
HIP 84461 |
23.44 |
| 2026-08-01 00:00 |
16:48:27.48 |
-87:50:28.3 |
HIP 84461 |
23.36 |
| 2026-08-01 12:00 |
16:47:50.99 |
-87:49:58.0 |
HIP 84461 |
23.30 |
| 2026-08-02 00:00 |
16:47:15.26 |
-87:49:27.5 |
HIP 84461 |
23.24 |
| 2026-08-02 12:00 |
16:46:40.26 |
-87:48:56.8 |
HIP 84461 |
23.19 |
| 2026-08-03 00:00 |
16:46:06.01 |
-87:48:25.9 |
HIP 84461 |
23.16 |
| 2026-08-03 12:00 |
16:45:32.50 |
-87:47:54.8 |
HIP 84461 |
23.14 |
| 2026-08-04 00:00 |
16:44:59.72 |
-87:47:23.6 |
HIP 84461 |
23.12 |
| 2026-08-04 12:00 |
16:44:27.67 |
-87:46:52.2 |
HIP 84461 |
23.12 |
| 2026-08-05 00:00 |
16:43:56.34 |
-87:46:20.6 |
HIP 84461 |
23.13 |
| 2026-08-05 12:00 |
16:43:25.74 |
-87:45:48.8 |
HIP 84461 |
23.15 |
| 2026-08-06 00:00 |
16:42:55.86 |
-87:45:16.9 |
HIP 84461 |
23.18 |
| 2026-08-06 12:00 |
16:42:26.68 |
-87:44:44.8 |
HIP 84461 |
23.22 |
| 2026-08-07 00:00 |
16:41:58.22 |
-87:44:12.5 |
HIP 84461 |
23.27 |
| 2026-08-07 12:00 |
16:41:30.46 |
-87:43:40.1 |
HIP 84461 |
23.34 |
| 2026-08-08 00:00 |
16:41:03.39 |
-87:43:07.6 |
HIP 84461 |
23.41 |
| 2026-08-08 12:00 |
16:40:37.03 |
-87:42:34.9 |
HIP 84461 |
23.49 |
| 2026-08-09 00:00 |
16:40:11.35 |
-87:42:02.1 |
HIP 84461 |
23.59 |
| 2026-08-09 12:00 |
16:39:46.36 |
-87:41:29.1 |
HIP 84461 |
23.69 |
| 2026-08-10 00:00 |
16:39:22.05 |
-87:40:56.1 |
HIP 84461 |
23.80 |
| 2026-08-10 12:00 |
16:38:58.41 |
-87:40:22.9 |
HIP 84461 |
23.93 |
| 2026-08-11 00:00 |
16:38:35.45 |
-87:39:49.5 |
HIP 84461 |
24.06 |
| 2026-08-11 12:00 |
16:38:13.15 |
-87:39:16.1 |
HIP 84461 |
24.20 |
| 2026-08-12 00:00 |
16:37:51.52 |
-87:38:42.5 |
HIP 84461 |
24.35 |
| 2026-08-12 12:00 |
16:37:30.53 |
-87:38:08.9 |
HIP 84461 |
24.51 |
| 2026-08-13 00:00 |
16:37:10.20 |
-87:37:35.1 |
HIP 84461 |
24.68 |
| 2026-08-13 12:00 |
16:36:50.52 |
-87:37:01.2 |
HIP 84461 |
24.85 |
| 2026-08-14 00:00 |
16:36:31.47 |
-87:36:27.3 |
HIP 84461 |
25.04 |
| 2026-08-14 12:00 |
16:36:13.06 |
-87:35:53.2 |
HIP 84461 |
25.23 |
| 2026-08-15 00:00 |
16:35:55.28 |
-87:35:19.1 |
HIP 84461 |
25.43 |
| 2026-08-15 12:00 |
16:35:38.12 |
-87:34:44.9 |
HIP 84461 |
25.63 |
| 2026-08-16 00:00 |
16:35:21.57 |
-87:34:10.6 |
HIP 84461 |
25.85 |
| 2026-08-16 12:00 |
16:35:05.64 |
-87:33:36.2 |
HIP 84461 |
26.07 |
| 2026-08-17 00:00 |
16:34:50.32 |
-87:33:01.7 |
HIP 84461 |
26.29 |
| 2026-08-17 12:00 |
16:34:35.59 |
-87:32:27.2 |
HIP 83769 |
26.42 |
| 2026-08-18 00:00 |
16:34:21.46 |
-87:31:52.7 |
HIP 83769 |
26.28 |
| 2026-08-18 12:00 |
16:34:07.91 |
-87:31:18.0 |
HIP 82459 |
25.94 |
| 2026-08-19 00:00 |
16:33:54.95 |
-87:30:43.3 |
HIP 82459 |
25.51 |