メタデータ
| 項目 |
値 |
| Designation |
461P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-05T00:29:50.389440Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:14Z |
| Obs used |
756 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
14.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-07-28T09:12:17.856000Z |
| Discovery magnitude (MPC) |
20.40 C |
| Discovery observatory (MPC) |
H36 · Sandlot Observatory, Scranton |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-04-09.0000000 |
| e |
0.57036034 |
| q (au) |
1.348581 |
| a (au) |
3.138866 |
| i (deg) |
18.412131 |
| Ω (om, deg) |
194.400261 |
| ω (w, deg) |
174.777098 |
| M (ma, deg) |
263.581492 |
等級
散乱 + 全体線形
$$
M_a = (18.224 + 4.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.224 |
| n |
4.041 |
| gf |
0.881 |
| gb |
-0.772 |
| k |
0.976 |
| δ90 |
1.000 |
| 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 |
| 2021-06-06 |
2021-10-04 |
+0.8293 |
+0.008 |
| 2021-10-05 |
2022-01-28 |
-2.0272 |
+0.197 |
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) |
| 2026-03-26 00:00 |
16:32:47.13 |
-07:49:55.1 |
HIP 80904 |
22.66 |
| 2026-03-26 12:00 |
16:32:49.40 |
-07:46:59.0 |
HIP 80904 |
24.05 |
| 2026-03-27 00:00 |
16:32:51.38 |
-07:44:01.8 |
HIP 80904 |
25.66 |
| 2026-03-27 12:00 |
16:32:53.07 |
-07:41:03.4 |
HIP 80904 |
27.45 |
| 2026-03-28 00:00 |
16:32:54.47 |
-07:38:03.9 |
HIP 80891 |
27.58 |
| 2026-03-28 12:00 |
16:32:55.57 |
-07:35:03.2 |
HIP 80891 |
27.40 |
| 2026-03-29 00:00 |
16:32:56.39 |
-07:32:01.4 |
HIP 80891 |
27.48 |
| 2026-03-29 12:00 |
16:32:56.91 |
-07:28:58.5 |
HIP 80891 |
27.83 |
| 2026-03-30 00:00 |
16:32:57.14 |
-07:25:54.5 |
HIP 80891 |
28.43 |
| 2026-03-30 12:00 |
16:32:57.07 |
-07:22:49.4 |
HIP 81049 |
26.16 |
| 2026-03-31 00:00 |
16:32:56.71 |
-07:19:43.1 |
HIP 81049 |
23.11 |
| 2026-03-31 12:00 |
16:32:56.05 |
-07:16:35.8 |
HIP 81049 |
20.08 |
| 2026-04-01 00:00 |
16:32:55.09 |
-07:13:27.4 |
HIP 81049 |
17.09 |
| 2026-04-01 12:00 |
16:32:53.83 |
-07:10:17.9 |
HIP 81049 |
14.16 |
| 2026-04-02 00:00 |
16:32:52.27 |
-07:07:07.4 |
HIP 81049 |
11.40 |
| 2026-04-02 12:00 |
16:32:50.41 |
-07:03:55.8 |
HIP 81049 |
8.96 |
| 2026-04-03 00:00 |
16:32:48.25 |
-07:00:43.2 |
HIP 81049 |
7.22 |
| 2026-04-03 12:00 |
16:32:45.79 |
-06:57:29.5 |
HIP 81049 |
6.81 |
| 2026-04-04 00:00 |
16:32:43.02 |
-06:54:14.9 |
HIP 81049 |
7.95 |
| 2026-04-04 12:00 |
16:32:39.95 |
-06:50:59.2 |
HIP 81046 |
9.64 |
| 2026-04-05 00:00 |
16:32:36.57 |
-06:47:42.5 |
HIP 81046 |
9.08 |
| 2026-04-05 12:00 |
16:32:32.88 |
-06:44:24.8 |
HIP 81046 |
9.81 |
| 2026-04-06 00:00 |
16:32:28.89 |
-06:41:06.2 |
HIP 81046 |
11.63 |
| 2026-04-06 12:00 |
16:32:24.59 |
-06:37:46.6 |
HIP 81046 |
14.16 |
| 2026-04-07 00:00 |
16:32:19.98 |
-06:34:26.0 |
HIP 81046 |
17.09 |
| 2026-04-07 12:00 |
16:32:15.06 |
-06:31:04.5 |
HIP 81046 |
20.29 |
| 2026-04-08 00:00 |
16:32:09.84 |
-06:27:42.1 |
HIP 81046 |
23.65 |
| 2026-04-08 12:00 |
16:32:04.30 |
-06:24:18.8 |
HIP 81046 |
27.14 |
| 2026-04-09 00:00 |
16:31:58.45 |
-06:20:54.6 |
HIP 80834 |
27.34 |
| 2026-04-09 12:00 |
16:31:52.29 |
-06:17:29.5 |
HIP 80834 |
24.24 |
| 2026-04-10 00:00 |
16:31:45.82 |
-06:14:03.6 |
HIP 80834 |
21.26 |
| 2026-04-10 12:00 |
16:31:39.04 |
-06:10:36.8 |
HIP 80834 |
18.51 |
| 2026-04-11 00:00 |
16:31:31.94 |
-06:07:09.2 |
HIP 80834 |
16.12 |
| 2026-04-11 12:00 |
16:31:24.54 |
-06:03:40.8 |
HIP 80834 |
14.33 |
| 2026-04-12 00:00 |
16:31:16.81 |
-06:00:11.6 |
HIP 80834 |
13.41 |
| 2026-04-12 12:00 |
16:31:08.78 |
-05:56:41.6 |
HIP 80834 |
13.58 |
| 2026-04-13 00:00 |
16:31:00.43 |
-05:53:10.9 |
HIP 80834 |
14.86 |
| 2026-04-13 12:00 |
16:30:51.78 |
-05:49:39.4 |
HIP 80834 |
17.02 |
| 2026-04-14 00:00 |
16:30:42.80 |
-05:46:07.2 |
HIP 80834 |
19.82 |
| 2026-04-14 12:00 |
16:30:33.52 |
-05:42:34.4 |
HIP 80834 |
23.04 |
| 2026-04-15 00:00 |
16:30:23.92 |
-05:39:00.8 |
HIP 80745 |
22.02 |
| 2026-04-15 12:00 |
16:30:14.01 |
-05:35:26.6 |
HIP 80745 |
18.09 |
| 2026-04-16 00:00 |
16:30:03.79 |
-05:31:51.8 |
HIP 80745 |
14.32 |