メタデータ
| 項目 |
値 |
| Designation |
112P/Urata-Niijima |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-06-24T12:01:14.373120Z |
| Orbit solution date (soln_date, UTC) |
2021-09-20T10:16:48Z |
| Obs used |
617 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
15.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-10-02.0000000 |
| e |
0.58749274 |
| q (au) |
1.458798 |
| a (au) |
3.536417 |
| i (deg) |
24.201453 |
| Ω (om, deg) |
31.931835 |
| ω (w, deg) |
21.352202 |
| M (ma, deg) |
212.314948 |
等級
散乱 + 全体線形
$$
M_a = (14.858 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.858 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
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) |
| 2026-05-12 00:00 |
00:38:11.05 |
-12:32:39.6 |
HIP 3028 |
22.95 |
| 2026-05-12 12:00 |
00:39:13.83 |
-12:24:21.8 |
HIP 3028 |
17.17 |
| 2026-05-13 00:00 |
00:40:16.66 |
-12:16:03.0 |
HIP 3028 |
25.92 |
| 2026-05-13 12:00 |
00:41:19.54 |
-12:07:43.1 |
HIP 3316 |
23.63 |
| 2026-05-14 00:00 |
00:42:22.46 |
-11:59:22.1 |
HIP 3316 |
11.25 |
| 2026-05-14 12:00 |
00:43:25.43 |
-11:51:00.0 |
HIP 3436 |
11.40 |
| 2026-05-15 00:00 |
00:44:28.45 |
-11:42:36.9 |
HIP 3436 |
20.36 |
| 2026-05-15 12:00 |
00:45:31.52 |
-11:34:12.6 |
HIP 3610 |
12.54 |
| 2026-05-16 00:00 |
00:46:34.64 |
-11:25:47.3 |
HIP 3610 |
5.28 |
| 2026-05-16 12:00 |
00:47:37.80 |
-11:17:21.0 |
HIP 3670 |
12.33 |
| 2026-05-17 00:00 |
00:48:41.02 |
-11:08:53.5 |
HIP 3861 |
17.28 |
| 2026-05-17 12:00 |
00:49:44.28 |
-11:00:25.0 |
HIP 3861 |
3.62 |
| 2026-05-18 00:00 |
00:50:47.60 |
-10:51:55.4 |
HIP 4009 |
9.64 |
| 2026-05-18 12:00 |
00:51:50.96 |
-10:43:24.7 |
HIP 4078 |
6.65 |
| 2026-05-19 00:00 |
00:52:54.38 |
-10:34:52.9 |
HIP 4078 |
12.65 |
| 2026-05-19 12:00 |
00:53:57.84 |
-10:26:20.1 |
HIP 4335 |
29.67 |
| 2026-05-20 00:00 |
00:55:01.36 |
-10:17:46.1 |
HIP 4335 |
27.90 |
| 2026-05-20 12:00 |
00:56:04.93 |
-10:09:11.1 |
HIP 4391 |
20.87 |
| 2026-05-21 00:00 |
00:57:08.56 |
-10:00:34.9 |
HIP 4391 |
17.86 |
| 2026-05-21 12:00 |
00:58:12.24 |
-09:51:57.7 |
HIP 4391 |
29.03 |
| 2026-05-22 00:00 |
00:59:15.97 |
-09:43:19.4 |
HIP 4736 |
31.24 |
| 2026-05-22 12:00 |
01:00:19.76 |
-09:34:39.9 |
HIP 4736 |
14.35 |
| 2026-05-23 00:00 |
01:01:23.60 |
-09:25:59.4 |
HIP 4788 |
1.21 |
| 2026-05-23 12:00 |
01:02:27.50 |
-09:17:17.7 |
HIP 4788 |
16.87 |
| 2026-05-24 00:00 |
01:03:31.46 |
-09:08:34.9 |
HIP 4982 |
4.90 |
| 2026-05-24 12:00 |
01:04:35.48 |
-08:59:51.0 |
HIP 4982 |
13.52 |
| 2026-05-25 00:00 |
01:05:39.56 |
-08:51:06.0 |
HIP 5154 |
12.39 |
| 2026-05-25 12:00 |
01:06:43.69 |
-08:42:19.8 |
HIP 5217 |
0.55 |
| 2026-05-26 00:00 |
01:07:47.89 |
-08:33:32.5 |
HIP 5217 |
18.10 |
| 2026-05-26 12:00 |
01:08:52.15 |
-08:24:44.1 |
HIP 5301 |
19.03 |
| 2026-05-27 00:00 |
01:09:56.47 |
-08:15:54.6 |
HIP 5301 |
31.71 |
| 2026-05-27 12:00 |
01:11:00.86 |
-08:07:03.8 |
HIP 5590 |
15.20 |
| 2026-05-28 00:00 |
01:12:05.31 |
-07:58:12.0 |
HIP 5590 |
6.30 |
| 2026-05-28 12:00 |
01:13:09.82 |
-07:49:19.0 |
HIP 5760 |
16.47 |
| 2026-05-29 00:00 |
01:14:14.40 |
-07:40:24.8 |
HIP 5760 |
5.60 |
| 2026-05-29 12:00 |
01:15:19.05 |
-07:31:29.5 |
HIP 5759 |
21.51 |
| 2026-05-30 00:00 |
01:16:23.77 |
-07:22:33.0 |
HIP 5933 |
13.72 |
| 2026-05-30 12:00 |
01:17:28.56 |
-07:13:35.4 |
HIP 5933 |
18.36 |
| 2026-05-31 00:00 |
01:18:33.41 |
-07:04:36.6 |
HIP 5933 |
34.13 |
| 2026-05-31 12:00 |
01:19:38.34 |
-06:55:36.6 |
HIP 6146 |
39.49 |
| 2026-06-01 00:00 |
01:20:43.33 |
-06:46:35.5 |
HIP 6331 |
37.99 |
| 2026-06-01 12:00 |
01:21:48.40 |
-06:37:33.2 |
HIP 6331 |
29.02 |
| 2026-06-02 00:00 |
01:22:53.55 |
-06:28:29.7 |
HIP 6331 |
30.46 |