112P/Urata-Niijima
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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:20:24.83 |
-33:56:47.7 |
HIP 105249 |
16.47 |
| 2026-02-03 12:00 |
21:21:24.01 |
-33:51:59.3 |
HIP 105566 |
21.67 |
| 2026-02-04 00:00 |
21:22:23.22 |
-33:47:09.8 |
HIP 105566 |
9.15 |
| 2026-02-04 12:00 |
21:23:22.45 |
-33:42:19.2 |
HIP 105620 |
2.93 |
| 2026-02-05 00:00 |
21:24:21.70 |
-33:37:27.6 |
HIP 105620 |
10.62 |
| 2026-02-05 12:00 |
21:25:20.97 |
-33:32:34.8 |
HIP 105620 |
23.86 |
| 2026-02-06 00:00 |
21:26:20.26 |
-33:27:41.0 |
HIP 105901 |
27.82 |
| 2026-02-06 12:00 |
21:27:19.57 |
-33:22:46.0 |
HIP 105964 |
30.43 |
| 2026-02-07 00:00 |
21:28:18.90 |
-33:17:50.0 |
HIP 105964 |
27.08 |
| 2026-02-07 12:00 |
21:29:18.25 |
-33:12:52.9 |
HIP 106225 |
23.90 |
| 2026-02-08 00:00 |
21:30:17.62 |
-33:07:54.6 |
HIP 106225 |
18.42 |
| 2026-02-08 12:00 |
21:31:17.01 |
-33:02:55.3 |
HIP 106225 |
21.57 |
| 2026-02-09 00:00 |
21:32:16.42 |
-32:57:54.9 |
HIP 106225 |
30.84 |
| 2026-02-09 12:00 |
21:33:15.85 |
-32:52:53.4 |
HIP 106549 |
24.26 |
| 2026-02-10 00:00 |
21:34:15.30 |
-32:47:50.8 |
HIP 106549 |
12.09 |
| 2026-02-10 12:00 |
21:35:14.76 |
-32:42:47.1 |
HIP 106549 |
8.18 |
| 2026-02-11 00:00 |
21:36:14.24 |
-32:37:42.3 |
HIP 106623 |
11.58 |
| 2026-02-11 12:00 |
21:37:13.74 |
-32:32:36.4 |
HIP 106623 |
19.01 |
| 2026-02-12 00:00 |
21:38:13.26 |
-32:27:29.5 |
HIP 106623 |
30.92 |
| 2026-02-12 12:00 |
21:39:12.79 |
-32:22:21.4 |
HIP 106880 |
28.06 |
| 2026-02-13 00:00 |
21:40:12.34 |
-32:17:12.3 |
HIP 107103 |
23.49 |
| 2026-02-13 12:00 |
21:41:11.91 |
-32:12:02.0 |
HIP 107058 |
16.86 |
| 2026-02-14 00:00 |
21:42:11.49 |
-32:06:50.7 |
HIP 107058 |
19.10 |
| 2026-02-14 12:00 |
21:43:11.08 |
-32:01:38.2 |
HIP 107058 |
28.62 |
| 2026-02-15 00:00 |
21:44:10.69 |
-31:56:24.7 |
HIP 107399 |
21.80 |
| 2026-02-15 12:00 |
21:45:10.32 |
-31:51:10.1 |
HIP 107399 |
12.02 |
| 2026-02-16 00:00 |
21:46:09.96 |
-31:45:54.4 |
HIP 107399 |
13.77 |
| 2026-02-16 12:00 |
21:47:09.61 |
-31:40:37.7 |
HIP 107399 |
24.75 |
| 2026-02-17 00:00 |
21:48:09.28 |
-31:35:19.8 |
HIP 107399 |
37.62 |
| 2026-02-17 12:00 |
21:49:08.95 |
-31:30:00.9 |
HIP 107608 |
40.41 |
| 2026-02-18 00:00 |
21:50:08.65 |
-31:24:40.8 |
HIP 107608 |
43.62 |
| 2026-02-18 12:00 |
21:51:08.35 |
-31:19:19.7 |
HIP 107608 |
50.56 |
| 2026-02-19 00:00 |
21:52:08.06 |
-31:13:57.5 |
HIP 108185 |
38.93 |
| 2026-02-19 12:00 |
21:53:07.79 |
-31:08:34.3 |
HIP 108185 |
28.88 |
| 2026-02-20 00:00 |
21:54:07.52 |
-31:03:09.9 |
HIP 108185 |
23.14 |
| 2026-02-20 12:00 |
21:55:07.27 |
-30:57:44.5 |
HIP 108264 |
11.52 |
| 2026-02-21 00:00 |
21:56:07.03 |
-30:52:18.0 |
HIP 108264 |
3.47 |
| 2026-02-21 12:00 |
21:57:06.79 |
-30:46:50.4 |
HIP 108264 |
16.73 |
| 2026-02-22 00:00 |
21:58:06.57 |
-30:41:21.8 |
HIP 108504 |
25.57 |
| 2026-02-22 12:00 |
21:59:06.35 |
-30:35:52.1 |
HIP 108504 |
29.19 |
| 2026-02-23 00:00 |
22:00:06.15 |
-30:30:21.3 |
HIP 108579 |
31.81 |
| 2026-02-23 12:00 |
22:01:05.95 |
-30:24:49.4 |
HIP 108818 |
27.39 |
| 2026-02-24 00:00 |
22:02:05.76 |
-30:19:16.5 |
HIP 108818 |
24.74 |