メタデータ
| 項目 |
値 |
| Designation |
464P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-02-28T09:38:59.409600Z |
| Orbit solution date (soln_date, UTC) |
2024-08-18T18:42:26Z |
| Obs used |
175 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
17.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2014-07-25T10:20:03.840000Z |
| Discovery magnitude (MPC) |
21.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-06-17.0000000 |
| e |
0.28094023 |
| q (au) |
3.372325 |
| a (au) |
4.689909 |
| i (deg) |
21.665175 |
| Ω (om, deg) |
309.606244 |
| ω (w, deg) |
267.729176 |
| M (ma, deg) |
335.118359 |
等級
散乱 + 全体線形
$$
M_a = (7.375 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.375 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-01-09 |
2023-02-03 |
+34.8067 |
-18.081 |
| 2023-03-15 |
2024-08-06 |
+13.0591 |
-7.225 |
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 |
23:13:49.46 |
+08:29:34.9 |
HIP 114784 |
25.95 |
| 2026-03-26 12:00 |
23:14:11.67 |
+08:32:44.3 |
HIP 114784 |
19.85 |
| 2026-03-27 00:00 |
23:14:33.85 |
+08:35:53.8 |
HIP 114784 |
13.94 |
| 2026-03-27 12:00 |
23:14:55.99 |
+08:39:03.6 |
HIP 114784 |
8.66 |
| 2026-03-28 00:00 |
23:15:18.09 |
+08:42:13.6 |
HIP 114784 |
5.95 |
| 2026-03-28 12:00 |
23:15:40.16 |
+08:45:23.8 |
HIP 114784 |
8.68 |
| 2026-03-29 00:00 |
23:16:02.19 |
+08:48:34.2 |
HIP 114784 |
13.95 |
| 2026-03-29 12:00 |
23:16:24.19 |
+08:51:44.8 |
HIP 114784 |
19.82 |
| 2026-03-30 00:00 |
23:16:46.14 |
+08:54:55.5 |
HIP 114784 |
25.88 |
| 2026-03-30 12:00 |
23:17:08.06 |
+08:58:06.5 |
HIP 115052 |
29.29 |
| 2026-03-31 00:00 |
23:17:29.94 |
+09:01:17.6 |
HIP 115041 |
29.84 |
| 2026-03-31 12:00 |
23:17:51.78 |
+09:04:29.0 |
HIP 115041 |
25.80 |
| 2026-04-01 00:00 |
23:18:13.58 |
+09:07:40.5 |
HIP 115161 |
21.33 |
| 2026-04-01 12:00 |
23:18:35.34 |
+09:10:52.2 |
HIP 115161 |
16.98 |
| 2026-04-02 00:00 |
23:18:57.05 |
+09:14:04.1 |
HIP 115161 |
14.13 |
| 2026-04-02 12:00 |
23:19:18.73 |
+09:17:16.1 |
HIP 115161 |
13.76 |
| 2026-04-03 00:00 |
23:19:40.36 |
+09:20:28.3 |
HIP 115161 |
16.03 |
| 2026-04-03 12:00 |
23:20:01.95 |
+09:23:40.7 |
HIP 115161 |
20.05 |
| 2026-04-04 00:00 |
23:20:23.50 |
+09:26:53.2 |
HIP 115293 |
14.84 |
| 2026-04-04 12:00 |
23:20:45.00 |
+09:30:05.9 |
HIP 115293 |
9.43 |
| 2026-04-05 00:00 |
23:21:06.46 |
+09:33:18.7 |
HIP 115293 |
5.88 |
| 2026-04-05 12:00 |
23:21:27.88 |
+09:36:31.7 |
HIP 115293 |
7.52 |
| 2026-04-06 00:00 |
23:21:49.25 |
+09:39:44.8 |
HIP 115293 |
12.44 |
| 2026-04-06 12:00 |
23:22:10.57 |
+09:42:58.1 |
HIP 115293 |
18.13 |
| 2026-04-07 00:00 |
23:22:31.85 |
+09:46:11.5 |
HIP 115293 |
24.04 |
| 2026-04-07 12:00 |
23:22:53.08 |
+09:49:25.1 |
HIP 115293 |
30.04 |
| 2026-04-08 00:00 |
23:23:14.26 |
+09:52:38.8 |
HIP 115398 |
31.37 |
| 2026-04-08 12:00 |
23:23:35.39 |
+09:55:52.6 |
HIP 115398 |
30.53 |
| 2026-04-09 00:00 |
23:23:56.48 |
+09:59:06.6 |
HIP 115398 |
30.90 |
| 2026-04-09 12:00 |
23:24:17.51 |
+10:02:20.7 |
HIP 115398 |
32.42 |
| 2026-04-10 00:00 |
23:24:38.50 |
+10:05:34.9 |
HIP 115592 |
32.48 |
| 2026-04-10 12:00 |
23:24:59.43 |
+10:08:49.2 |
HIP 115592 |
29.13 |
| 2026-04-11 00:00 |
23:25:20.32 |
+10:12:03.6 |
HIP 115592 |
26.75 |
| 2026-04-11 12:00 |
23:25:41.15 |
+10:15:18.1 |
HIP 115592 |
25.62 |
| 2026-04-12 00:00 |
23:26:01.93 |
+10:18:32.8 |
HIP 115592 |
25.88 |
| 2026-04-12 12:00 |
23:26:22.65 |
+10:21:47.5 |
HIP 115592 |
27.49 |
| 2026-04-13 00:00 |
23:26:43.33 |
+10:25:02.3 |
HIP 115592 |
30.23 |
| 2026-04-13 12:00 |
23:27:03.94 |
+10:28:17.2 |
HIP 115592 |
33.82 |
| 2026-04-14 00:00 |
23:27:24.50 |
+10:31:32.3 |
HIP 115825 |
37.44 |
| 2026-04-14 12:00 |
23:27:45.01 |
+10:34:47.4 |
HIP 115825 |
33.49 |
| 2026-04-15 00:00 |
23:28:05.46 |
+10:38:02.5 |
HIP 115825 |
30.21 |
| 2026-04-15 12:00 |
23:28:25.85 |
+10:41:17.8 |
HIP 115825 |
27.85 |
| 2026-04-16 00:00 |
23:28:46.18 |
+10:44:33.1 |
HIP 115825 |
26.63 |