メタデータ
| 項目 |
値 |
| Designation |
445P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-19T02:37:51.418560Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:58Z |
| Obs used |
308 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
6.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
1998-11-22T06:48:55.008000Z |
| Discovery magnitude (MPC) |
21.10 V |
| Discovery observatory (MPC) |
691 · Steward Observatory, Kitt Peak-Spacewatch |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-12-24.0000000 |
| e |
0.41248906 |
| q (au) |
2.383958 |
| a (au) |
4.057726 |
| i (deg) |
1.088174 |
| Ω (om, deg) |
126.549865 |
| ω (w, deg) |
213.725650 |
| M (ma, deg) |
199.131293 |
等級
散乱 + 全体線形
$$
M_a = (14.751 + 2.907\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.751 |
| n |
2.907 |
| gf |
1.000 |
| gb |
-0.864 |
| k |
0.999 |
| 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) |
| 2026-03-26 00:00 |
09:45:00.24 |
+14:05:01.9 |
HIP 47723 |
18.89 |
| 2026-03-26 12:00 |
09:44:49.95 |
+14:05:54.4 |
HIP 47723 |
16.67 |
| 2026-03-27 00:00 |
09:44:39.81 |
+14:06:46.0 |
HIP 47723 |
14.62 |
| 2026-03-27 12:00 |
09:44:29.84 |
+14:07:36.8 |
HIP 47723 |
12.80 |
| 2026-03-28 00:00 |
09:44:20.02 |
+14:08:26.7 |
HIP 47723 |
11.30 |
| 2026-03-28 12:00 |
09:44:10.36 |
+14:09:15.7 |
HIP 47723 |
10.22 |
| 2026-03-29 00:00 |
09:44:00.86 |
+14:10:03.9 |
HIP 47723 |
9.68 |
| 2026-03-29 12:00 |
09:43:51.52 |
+14:10:51.2 |
HIP 47723 |
9.73 |
| 2026-03-30 00:00 |
09:43:42.35 |
+14:11:37.6 |
HIP 47723 |
10.33 |
| 2026-03-30 12:00 |
09:43:33.34 |
+14:12:23.1 |
HIP 47723 |
11.37 |
| 2026-03-31 00:00 |
09:43:24.50 |
+14:13:07.8 |
HIP 47723 |
12.73 |
| 2026-03-31 12:00 |
09:43:15.82 |
+14:13:51.5 |
HIP 47723 |
14.28 |
| 2026-04-01 00:00 |
09:43:07.30 |
+14:14:34.4 |
HIP 47723 |
15.96 |
| 2026-04-01 12:00 |
09:42:58.96 |
+14:15:16.4 |
HIP 47723 |
17.72 |
| 2026-04-02 00:00 |
09:42:50.78 |
+14:15:57.5 |
HIP 47723 |
19.51 |
| 2026-04-02 12:00 |
09:42:42.77 |
+14:16:37.8 |
HIP 47723 |
21.32 |
| 2026-04-03 00:00 |
09:42:34.92 |
+14:17:17.1 |
HIP 47723 |
23.13 |
| 2026-04-03 12:00 |
09:42:27.25 |
+14:17:55.6 |
HIP 47503 |
22.35 |
| 2026-04-04 00:00 |
09:42:19.74 |
+14:18:33.1 |
HIP 47503 |
21.07 |
| 2026-04-04 12:00 |
09:42:12.41 |
+14:19:09.8 |
HIP 47503 |
19.93 |
| 2026-04-05 00:00 |
09:42:05.25 |
+14:19:45.5 |
HIP 47503 |
18.92 |
| 2026-04-05 12:00 |
09:41:58.26 |
+14:20:20.4 |
HIP 47503 |
18.07 |
| 2026-04-06 00:00 |
09:41:51.44 |
+14:20:54.4 |
HIP 47503 |
17.37 |
| 2026-04-06 12:00 |
09:41:44.79 |
+14:21:27.4 |
HIP 47503 |
16.84 |
| 2026-04-07 00:00 |
09:41:38.32 |
+14:21:59.6 |
HIP 47503 |
16.48 |
| 2026-04-07 12:00 |
09:41:32.02 |
+14:22:30.9 |
HIP 47503 |
16.27 |
| 2026-04-08 00:00 |
09:41:25.90 |
+14:23:01.2 |
HIP 47503 |
16.23 |
| 2026-04-08 12:00 |
09:41:19.95 |
+14:23:30.7 |
HIP 47503 |
16.33 |
| 2026-04-09 00:00 |
09:41:14.17 |
+14:23:59.3 |
HIP 47503 |
16.56 |
| 2026-04-09 12:00 |
09:41:08.57 |
+14:24:26.9 |
HIP 47503 |
16.91 |
| 2026-04-10 00:00 |
09:41:03.15 |
+14:24:53.6 |
HIP 47503 |
17.35 |
| 2026-04-10 12:00 |
09:40:57.90 |
+14:25:19.5 |
HIP 47503 |
17.86 |
| 2026-04-11 00:00 |
09:40:52.83 |
+14:25:44.4 |
HIP 47503 |
18.44 |
| 2026-04-11 12:00 |
09:40:47.94 |
+14:26:08.4 |
HIP 47503 |
19.07 |
| 2026-04-12 00:00 |
09:40:43.22 |
+14:26:31.5 |
HIP 47503 |
19.73 |
| 2026-04-12 12:00 |
09:40:38.68 |
+14:26:53.7 |
HIP 47503 |
20.41 |
| 2026-04-13 00:00 |
09:40:34.32 |
+14:27:15.0 |
HIP 47503 |
21.10 |
| 2026-04-13 12:00 |
09:40:30.14 |
+14:27:35.4 |
HIP 47368 |
21.00 |
| 2026-04-14 00:00 |
09:40:26.14 |
+14:27:54.8 |
HIP 47368 |
20.08 |
| 2026-04-14 12:00 |
09:40:22.31 |
+14:28:13.4 |
HIP 47368 |
19.20 |
| 2026-04-15 00:00 |
09:40:18.66 |
+14:28:31.0 |
HIP 47368 |
18.38 |
| 2026-04-15 12:00 |
09:40:15.20 |
+14:28:47.7 |
HIP 47368 |
17.61 |
| 2026-04-16 00:00 |
09:40:11.91 |
+14:29:03.5 |
HIP 47368 |
16.88 |