メタデータ
| 項目 |
値 |
| Designation |
245P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-07T17:42:17.867520Z |
| Orbit solution date (soln_date, UTC) |
2026-09-16T17:42:06Z |
| Obs used |
169 |
| NEO |
- |
| M1 |
17.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-09-27.0000000 |
| e |
0.46221309 |
| q (au) |
2.160789 |
| a (au) |
4.017928 |
| i (deg) |
21.290550 |
| Ω (om, deg) |
316.773003 |
| ω (w, deg) |
317.312982 |
| M (ma, deg) |
209.508007 |
等級
散乱 + 全体線形
$$
M_a = (16.231 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.231 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.921 |
| 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 |
20:55:12.95 |
-10:07:59.5 |
HIP 103388 |
29.71 |
| 2026-09-20 12:00 |
20:55:07.69 |
-10:05:16.6 |
HIP 103388 |
32.45 |
| 2026-09-21 00:00 |
20:55:02.85 |
-10:02:34.0 |
HIP 103379 |
33.40 |
| 2026-09-21 12:00 |
20:54:58.43 |
-09:59:51.7 |
HIP 103379 |
32.40 |
| 2026-09-22 00:00 |
20:54:54.42 |
-09:57:09.7 |
HIP 103379 |
31.57 |
| 2026-09-22 12:00 |
20:54:50.83 |
-09:54:27.9 |
HIP 103379 |
30.89 |
| 2026-09-23 00:00 |
20:54:47.65 |
-09:51:46.3 |
HIP 103379 |
30.37 |
| 2026-09-23 12:00 |
20:54:44.89 |
-09:49:05.0 |
HIP 103379 |
30.01 |
| 2026-09-24 00:00 |
20:54:42.53 |
-09:46:24.0 |
HIP 103379 |
29.81 |
| 2026-09-24 12:00 |
20:54:40.58 |
-09:43:43.2 |
HIP 103379 |
29.76 |
| 2026-09-25 00:00 |
20:54:39.03 |
-09:41:02.5 |
HIP 103379 |
29.86 |
| 2026-09-25 12:00 |
20:54:37.89 |
-09:38:22.1 |
HIP 103379 |
30.10 |
| 2026-09-26 00:00 |
20:54:37.15 |
-09:35:41.9 |
HIP 103379 |
30.48 |
| 2026-09-26 12:00 |
20:54:36.82 |
-09:33:01.9 |
HIP 103379 |
30.99 |
| 2026-09-27 00:00 |
20:54:36.88 |
-09:30:22.1 |
HIP 103379 |
31.63 |
| 2026-09-27 12:00 |
20:54:37.33 |
-09:27:42.5 |
HIP 103379 |
32.37 |
| 2026-09-28 00:00 |
20:54:38.18 |
-09:25:03.0 |
HIP 103223 |
32.12 |
| 2026-09-28 12:00 |
20:54:39.43 |
-09:22:23.7 |
HIP 103223 |
29.45 |
| 2026-09-29 00:00 |
20:54:41.06 |
-09:19:44.5 |
HIP 103223 |
26.78 |
| 2026-09-29 12:00 |
20:54:43.08 |
-09:17:05.5 |
HIP 103223 |
24.11 |
| 2026-09-30 00:00 |
20:54:45.49 |
-09:14:26.6 |
HIP 103223 |
21.45 |
| 2026-09-30 12:00 |
20:54:48.28 |
-09:11:47.8 |
HIP 103223 |
18.81 |
| 2026-10-01 00:00 |
20:54:51.46 |
-09:09:09.2 |
HIP 103223 |
16.21 |
| 2026-10-01 12:00 |
20:54:55.01 |
-09:06:30.6 |
HIP 103223 |
13.68 |
| 2026-10-02 00:00 |
20:54:58.95 |
-09:03:52.1 |
HIP 103223 |
11.31 |
| 2026-10-02 12:00 |
20:55:03.26 |
-09:01:13.7 |
HIP 103223 |
9.24 |
| 2026-10-03 00:00 |
20:55:07.94 |
-08:58:35.4 |
HIP 103223 |
7.73 |
| 2026-10-03 12:00 |
20:55:13.00 |
-08:55:57.1 |
HIP 103223 |
7.22 |
| 2026-10-04 00:00 |
20:55:18.43 |
-08:53:18.9 |
HIP 103223 |
7.94 |
| 2026-10-04 12:00 |
20:55:24.22 |
-08:50:40.7 |
HIP 103223 |
9.64 |
| 2026-10-05 00:00 |
20:55:30.39 |
-08:48:02.6 |
HIP 103223 |
11.96 |
| 2026-10-05 12:00 |
20:55:36.91 |
-08:45:24.4 |
HIP 103223 |
14.62 |
| 2026-10-06 00:00 |
20:55:43.80 |
-08:42:46.2 |
HIP 103223 |
17.50 |
| 2026-10-06 12:00 |
20:55:51.05 |
-08:40:08.0 |
HIP 103223 |
20.52 |
| 2026-10-07 00:00 |
20:55:58.66 |
-08:37:29.8 |
HIP 103223 |
23.66 |
| 2026-10-07 12:00 |
20:56:06.63 |
-08:34:51.6 |
HIP 103187 |
26.28 |
| 2026-10-08 00:00 |
20:56:14.95 |
-08:32:13.3 |
HIP 103187 |
28.05 |
| 2026-10-08 12:00 |
20:56:23.62 |
-08:29:34.9 |
HIP 103187 |
30.17 |
| 2026-10-09 00:00 |
20:56:32.64 |
-08:26:56.4 |
HIP 103187 |
32.60 |
| 2026-10-09 12:00 |
20:56:42.01 |
-08:24:17.9 |
HIP 103187 |
35.29 |
| 2026-10-10 00:00 |
20:56:51.73 |
-08:21:39.2 |
HIP 103187 |
38.19 |
| 2026-10-10 12:00 |
20:57:01.78 |
-08:19:00.4 |
HIP 103457 |
37.43 |
| 2026-10-11 00:00 |
20:57:12.18 |
-08:16:21.6 |
HIP 103457 |
34.26 |