メタデータ
| 項目 |
値 |
| Designation |
441P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-09-07T17:20:30.799680Z |
| Orbit solution date (soln_date, UTC) |
2025-11-13T12:12:49Z |
| Obs used |
204 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-01-25T12:16:34.464000Z |
| Discovery magnitude (MPC) |
22.11 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-01-23.0000000 |
| e |
0.19560717 |
| q (au) |
3.326113 |
| a (au) |
4.134936 |
| i (deg) |
2.574094 |
| Ω (om, deg) |
143.611657 |
| ω (w, deg) |
178.713774 |
| M (ma, deg) |
204.833512 |
等級
散乱 + 全体線形
$$
M_a = (16.395 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.395 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.786 |
| k |
0.966 |
| 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) |
| 2026-03-26 00:00 |
23:56:46.88 |
-01:32:32.4 |
HIP 118199 |
27.53 |
| 2026-03-26 12:00 |
23:57:25.92 |
-01:28:29.1 |
HIP 118199 |
20.77 |
| 2026-03-27 00:00 |
23:58:04.93 |
-01:24:25.8 |
HIP 118199 |
18.12 |
| 2026-03-27 12:00 |
23:58:43.92 |
-01:20:22.8 |
HIP 118199 |
21.17 |
| 2026-03-28 00:00 |
23:59:22.88 |
-01:16:19.8 |
HIP 118199 |
28.11 |
| 2026-03-28 12:00 |
00:00:01.83 |
-01:12:17.1 |
HIP 134 |
25.35 |
| 2026-03-29 00:00 |
00:00:40.75 |
-01:08:14.6 |
HIP 134 |
15.32 |
| 2026-03-29 12:00 |
00:01:19.65 |
-01:04:12.2 |
HIP 134 |
6.99 |
| 2026-03-30 00:00 |
00:01:58.52 |
-01:00:10.0 |
HIP 134 |
9.21 |
| 2026-03-30 12:00 |
00:02:37.37 |
-00:56:08.0 |
HIP 236 |
5.53 |
| 2026-03-31 00:00 |
00:03:16.20 |
-00:52:06.2 |
HIP 236 |
5.02 |
| 2026-03-31 12:00 |
00:03:55.00 |
-00:48:04.6 |
HIP 236 |
15.51 |
| 2026-04-01 00:00 |
00:04:33.77 |
-00:44:03.2 |
HIP 417 |
15.78 |
| 2026-04-01 12:00 |
00:05:12.53 |
-00:40:02.0 |
HIP 417 |
10.10 |
| 2026-04-02 00:00 |
00:05:51.25 |
-00:36:01.0 |
HIP 417 |
13.22 |
| 2026-04-02 12:00 |
00:06:29.96 |
-00:32:00.2 |
HIP 417 |
21.62 |
| 2026-04-03 00:00 |
00:07:08.63 |
-00:27:59.6 |
HIP 417 |
31.28 |
| 2026-04-03 12:00 |
00:07:47.28 |
-00:23:59.3 |
HIP 752 |
30.10 |
| 2026-04-04 00:00 |
00:08:25.91 |
-00:19:59.2 |
HIP 752 |
27.76 |
| 2026-04-04 12:00 |
00:09:04.51 |
-00:15:59.3 |
HIP 766 |
20.93 |
| 2026-04-05 00:00 |
00:09:43.08 |
-00:11:59.7 |
HIP 766 |
16.96 |
| 2026-04-05 12:00 |
00:10:21.62 |
-00:08:00.3 |
HIP 766 |
18.85 |
| 2026-04-06 00:00 |
00:11:00.14 |
-00:04:01.1 |
HIP 968 |
17.72 |
| 2026-04-06 12:00 |
00:11:38.63 |
-00:00:02.2 |
HIP 968 |
14.68 |
| 2026-04-07 00:00 |
00:12:17.09 |
+00:03:56.4 |
HIP 968 |
18.27 |
| 2026-04-07 12:00 |
00:12:55.53 |
+00:07:54.8 |
HIP 1082 |
18.65 |
| 2026-04-08 00:00 |
00:13:33.93 |
+00:11:52.9 |
HIP 1127 |
15.79 |
| 2026-04-08 12:00 |
00:14:12.31 |
+00:15:50.8 |
HIP 1127 |
17.97 |
| 2026-04-09 00:00 |
00:14:50.66 |
+00:19:48.3 |
HIP 1127 |
24.72 |
| 2026-04-09 12:00 |
00:15:28.97 |
+00:23:45.6 |
HIP 1385 |
30.06 |
| 2026-04-10 00:00 |
00:16:07.26 |
+00:27:42.6 |
HIP 1385 |
19.71 |
| 2026-04-10 12:00 |
00:16:45.52 |
+00:31:39.3 |
HIP 1385 |
9.36 |
| 2026-04-11 00:00 |
00:17:23.75 |
+00:35:35.8 |
HIP 1385 |
0.99 |
| 2026-04-11 12:00 |
00:18:01.95 |
+00:39:31.9 |
HIP 1385 |
11.30 |
| 2026-04-12 00:00 |
00:18:40.11 |
+00:43:27.7 |
HIP 1545 |
15.26 |
| 2026-04-12 12:00 |
00:19:18.25 |
+00:47:23.2 |
HIP 1545 |
16.16 |
| 2026-04-13 00:00 |
00:19:56.35 |
+00:51:18.3 |
HIP 1601 |
18.62 |
| 2026-04-13 12:00 |
00:20:34.41 |
+00:55:13.2 |
HIP 1601 |
16.61 |
| 2026-04-14 00:00 |
00:21:12.45 |
+00:59:07.7 |
HIP 1601 |
20.40 |
| 2026-04-14 12:00 |
00:21:50.45 |
+01:03:01.9 |
HIP 1601 |
27.71 |
| 2026-04-15 00:00 |
00:22:28.42 |
+01:06:55.7 |
HIP 1601 |
36.46 |
| 2026-04-15 12:00 |
00:23:06.35 |
+01:10:49.2 |
HIP 1924 |
28.70 |
| 2026-04-16 00:00 |
00:23:44.25 |
+01:14:42.3 |
HIP 1924 |
20.43 |