メタデータ
| 項目 |
値 |
| Designation |
444P/WISE-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-10T08:57:56.568960Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:30:16Z |
| Obs used |
247 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
9.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-06-09T02:52:48.864000Z |
| Discovery magnitude (MPC) |
- |
| Discovery observatory (MPC) |
C51 · WISE |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-03-11.0000000 |
| e |
0.57029119 |
| q (au) |
1.473180 |
| a (au) |
3.428321 |
| i (deg) |
22.124438 |
| Ω (om, deg) |
89.406707 |
| ω (w, deg) |
170.888063 |
| M (ma, deg) |
341.154570 |
等級
散乱 + 全体線形
$$
M_a = (16.117 + 4.549\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.117 |
| n |
4.549 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
05:44:26.05 |
+25:05:31.7 |
HIP 26998 |
23.40 |
| 2026-05-12 12:00 |
05:44:48.92 |
+25:06:08.4 |
HIP 26998 |
25.67 |
| 2026-05-13 00:00 |
05:45:11.86 |
+25:06:44.8 |
HIP 27236 |
26.77 |
| 2026-05-13 12:00 |
05:45:34.87 |
+25:07:21.1 |
HIP 27236 |
23.60 |
| 2026-05-14 00:00 |
05:45:57.97 |
+25:07:57.2 |
HIP 27236 |
21.25 |
| 2026-05-14 12:00 |
05:46:21.14 |
+25:08:33.1 |
HIP 27236 |
20.03 |
| 2026-05-15 00:00 |
05:46:44.38 |
+25:09:08.9 |
HIP 27236 |
20.18 |
| 2026-05-15 12:00 |
05:47:07.70 |
+25:09:44.4 |
HIP 27236 |
21.67 |
| 2026-05-16 00:00 |
05:47:31.09 |
+25:10:19.8 |
HIP 27353 |
23.80 |
| 2026-05-16 12:00 |
05:47:54.55 |
+25:10:55.0 |
HIP 27353 |
23.63 |
| 2026-05-17 00:00 |
05:48:18.08 |
+25:11:30.1 |
HIP 27353 |
24.65 |
| 2026-05-17 12:00 |
05:48:41.68 |
+25:12:04.9 |
HIP 27353 |
26.73 |
| 2026-05-18 00:00 |
05:49:05.36 |
+25:12:39.6 |
HIP 27478 |
26.38 |
| 2026-05-18 12:00 |
05:49:29.10 |
+25:13:14.0 |
HIP 27640 |
21.14 |
| 2026-05-19 00:00 |
05:49:52.90 |
+25:13:48.3 |
HIP 27640 |
15.75 |
| 2026-05-19 12:00 |
05:50:16.78 |
+25:14:22.4 |
HIP 27640 |
10.37 |
| 2026-05-20 00:00 |
05:50:40.72 |
+25:14:56.3 |
HIP 27640 |
5.08 |
| 2026-05-20 12:00 |
05:51:04.72 |
+25:15:30.0 |
HIP 27640 |
1.84 |
| 2026-05-21 00:00 |
05:51:28.79 |
+25:16:03.5 |
HIP 27640 |
6.37 |
| 2026-05-21 12:00 |
05:51:52.91 |
+25:16:36.8 |
HIP 27640 |
11.75 |
| 2026-05-22 00:00 |
05:52:17.11 |
+25:17:09.9 |
HIP 27640 |
17.20 |
| 2026-05-22 12:00 |
05:52:41.36 |
+25:17:42.8 |
HIP 27847 |
17.31 |
| 2026-05-23 00:00 |
05:53:05.67 |
+25:18:15.5 |
HIP 27847 |
14.93 |
| 2026-05-23 12:00 |
05:53:30.04 |
+25:18:48.0 |
HIP 27847 |
14.40 |
| 2026-05-24 00:00 |
05:53:54.47 |
+25:19:20.4 |
HIP 27847 |
15.90 |
| 2026-05-24 12:00 |
05:54:18.96 |
+25:19:52.5 |
HIP 27858 |
18.21 |
| 2026-05-25 00:00 |
05:54:43.50 |
+25:20:24.4 |
HIP 28084 |
20.21 |
| 2026-05-25 12:00 |
05:55:08.10 |
+25:20:56.1 |
HIP 28084 |
14.68 |
| 2026-05-26 00:00 |
05:55:32.76 |
+25:21:27.6 |
HIP 28084 |
9.22 |
| 2026-05-26 12:00 |
05:55:57.47 |
+25:21:59.0 |
HIP 28084 |
4.11 |
| 2026-05-27 00:00 |
05:56:22.23 |
+25:22:30.1 |
HIP 28084 |
3.43 |
| 2026-05-27 12:00 |
05:56:47.04 |
+25:23:01.0 |
HIP 28084 |
8.36 |
| 2026-05-28 00:00 |
05:57:11.91 |
+25:23:31.7 |
HIP 28084 |
13.85 |
| 2026-05-28 12:00 |
05:57:36.83 |
+25:24:02.2 |
HIP 28220 |
13.87 |
| 2026-05-29 00:00 |
05:58:01.80 |
+25:24:32.4 |
HIP 28220 |
14.65 |
| 2026-05-29 12:00 |
05:58:26.83 |
+25:25:02.5 |
HIP 28332 |
11.24 |
| 2026-05-30 00:00 |
05:58:51.90 |
+25:25:32.4 |
HIP 28332 |
6.74 |
| 2026-05-30 12:00 |
05:59:17.02 |
+25:26:02.1 |
HIP 28332 |
5.42 |
| 2026-05-31 00:00 |
05:59:42.18 |
+25:26:31.5 |
HIP 28332 |
8.84 |
| 2026-05-31 12:00 |
06:00:07.40 |
+25:27:00.7 |
HIP 28332 |
13.87 |
| 2026-06-01 00:00 |
06:00:32.66 |
+25:27:29.8 |
HIP 28548 |
14.17 |
| 2026-06-01 12:00 |
06:00:57.97 |
+25:27:58.6 |
HIP 28548 |
8.45 |
| 2026-06-02 00:00 |
06:01:23.32 |
+25:28:27.2 |
HIP 28548 |
2.76 |