メタデータ
| 項目 |
値 |
| Designation |
112P/Urata-Niijima |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-06-24T06:58:26.690880Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T09:57:22Z |
| Obs used |
605 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
19.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-01-02.0000000 |
| e |
0.58813164 |
| q (au) |
1.455171 |
| a (au) |
3.533098 |
| i (deg) |
24.202376 |
| Ω (om, deg) |
31.916513 |
| ω (w, deg) |
21.444363 |
| M (ma, deg) |
28.452084 |
等級
散乱 + 全体線形
$$
M_a = (14.735 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.735 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:21:41.38 |
+33:20:35.2 |
HIP 30367 |
29.08 |
| 2026-09-20 12:00 |
06:23:26.96 |
+33:31:15.6 |
HIP 30573 |
31.12 |
| 2026-09-21 00:00 |
06:25:12.74 |
+33:41:53.5 |
HIP 30573 |
27.30 |
| 2026-09-21 12:00 |
06:26:58.72 |
+33:52:29.0 |
HIP 30928 |
37.70 |
| 2026-09-22 00:00 |
06:28:44.88 |
+34:03:02.0 |
HIP 30928 |
14.22 |
| 2026-09-22 12:00 |
06:30:31.24 |
+34:13:32.5 |
HIP 30928 |
13.18 |
| 2026-09-23 00:00 |
06:32:17.78 |
+34:24:00.4 |
HIP 31142 |
8.13 |
| 2026-09-23 12:00 |
06:34:04.51 |
+34:34:25.7 |
HIP 31142 |
25.31 |
| 2026-09-24 00:00 |
06:35:51.41 |
+34:44:48.3 |
HIP 31619 |
14.64 |
| 2026-09-24 12:00 |
06:37:38.48 |
+34:55:08.3 |
HIP 31619 |
11.62 |
| 2026-09-25 00:00 |
06:39:25.73 |
+35:05:25.5 |
HIP 31863 |
16.78 |
| 2026-09-25 12:00 |
06:41:13.14 |
+35:15:40.0 |
HIP 31972 |
18.49 |
| 2026-09-26 00:00 |
06:43:00.72 |
+35:25:51.7 |
HIP 32236 |
14.28 |
| 2026-09-26 12:00 |
06:44:48.45 |
+35:36:00.6 |
HIP 32364 |
7.84 |
| 2026-09-27 00:00 |
06:46:36.33 |
+35:46:06.7 |
HIP 32364 |
20.61 |
| 2026-09-27 12:00 |
06:48:24.36 |
+35:56:09.9 |
HIP 32496 |
31.73 |
| 2026-09-28 00:00 |
06:50:12.53 |
+36:06:10.2 |
HIP 32862 |
10.26 |
| 2026-09-28 12:00 |
06:52:00.84 |
+36:16:07.5 |
HIP 32862 |
13.82 |
| 2026-09-29 00:00 |
06:53:49.28 |
+36:26:01.9 |
HIP 33209 |
32.09 |
| 2026-09-29 12:00 |
06:55:37.85 |
+36:35:53.3 |
HIP 33348 |
9.87 |
| 2026-09-30 00:00 |
06:57:26.54 |
+36:45:41.7 |
HIP 33348 |
15.74 |
| 2026-09-30 12:00 |
06:59:15.34 |
+36:55:27.1 |
HIP 33631 |
8.63 |
| 2026-10-01 00:00 |
07:01:04.25 |
+37:05:09.4 |
HIP 33768 |
4.32 |
| 2026-10-01 12:00 |
07:02:53.26 |
+37:14:48.7 |
HIP 34103 |
25.28 |
| 2026-10-02 00:00 |
07:04:42.37 |
+37:24:24.9 |
HIP 34103 |
10.67 |
| 2026-10-02 12:00 |
07:06:31.56 |
+37:33:58.0 |
HIP 34265 |
14.44 |
| 2026-10-03 00:00 |
07:08:20.84 |
+37:43:27.9 |
HIP 34462 |
17.03 |
| 2026-10-03 12:00 |
07:10:10.19 |
+37:52:54.8 |
HIP 34741 |
21.05 |
| 2026-10-04 00:00 |
07:11:59.61 |
+38:02:18.4 |
HIP 34695 |
13.43 |
| 2026-10-04 12:00 |
07:13:49.09 |
+38:11:39.0 |
HIP 34930 |
5.41 |
| 2026-10-05 00:00 |
07:15:38.62 |
+38:20:56.3 |
HIP 34930 |
27.31 |
| 2026-10-05 12:00 |
07:17:28.20 |
+38:30:10.5 |
HIP 35338 |
10.47 |
| 2026-10-06 00:00 |
07:19:17.81 |
+38:39:21.4 |
HIP 35431 |
5.05 |
| 2026-10-06 12:00 |
07:21:07.46 |
+38:48:29.2 |
HIP 35725 |
17.08 |
| 2026-10-07 00:00 |
07:22:57.12 |
+38:57:33.7 |
HIP 35725 |
8.78 |
| 2026-10-07 12:00 |
07:24:46.80 |
+39:06:35.1 |
HIP 35908 |
7.51 |
| 2026-10-08 00:00 |
07:26:36.49 |
+39:15:33.2 |
HIP 36207 |
9.79 |
| 2026-10-08 12:00 |
07:28:26.18 |
+39:24:28.1 |
HIP 36207 |
13.24 |
| 2026-10-09 00:00 |
07:30:15.86 |
+39:33:19.7 |
HIP 36453 |
9.40 |
| 2026-10-09 12:00 |
07:32:05.52 |
+39:42:08.1 |
HIP 36758 |
22.75 |
| 2026-10-10 00:00 |
07:33:55.16 |
+39:50:53.3 |
HIP 36758 |
23.96 |
| 2026-10-10 12:00 |
07:35:44.77 |
+39:59:35.2 |
HIP 37020 |
12.23 |
| 2026-10-11 00:00 |
07:37:34.33 |
+40:08:13.9 |
HIP 37105 |
4.93 |