メタデータ
| 項目 |
値 |
| Designation |
311P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-10-07T04:28:40.529280Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T07:12:14Z |
| Obs used |
369 |
| NEO |
- |
| M1 |
19.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-10-21.0000000 |
| e |
0.11521887 |
| q (au) |
1.936656 |
| a (au) |
2.188853 |
| i (deg) |
4.969881 |
| Ω (om, deg) |
279.226523 |
| ω (w, deg) |
144.475240 |
| M (ma, deg) |
252.810593 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-09-20 00:00 |
23:09:15.43 |
+04:32:58.4 |
HIP 114266 |
12.72 |
| 2026-09-20 12:00 |
23:08:46.46 |
+04:30:06.1 |
HIP 114266 |
10.97 |
| 2026-09-21 00:00 |
23:08:17.65 |
+04:27:12.7 |
HIP 114266 |
14.13 |
| 2026-09-21 12:00 |
23:07:49.01 |
+04:24:18.2 |
HIP 114266 |
19.96 |
| 2026-09-22 00:00 |
23:07:20.57 |
+04:21:22.6 |
HIP 114069 |
26.68 |
| 2026-09-22 12:00 |
23:06:52.32 |
+04:18:26.1 |
HIP 114069 |
25.21 |
| 2026-09-23 00:00 |
23:06:24.28 |
+04:15:28.8 |
HIP 113980 |
21.08 |
| 2026-09-23 12:00 |
23:05:56.46 |
+04:12:30.6 |
HIP 113980 |
14.10 |
| 2026-09-24 00:00 |
23:05:28.87 |
+04:09:31.7 |
HIP 113980 |
8.23 |
| 2026-09-24 12:00 |
23:05:01.52 |
+04:06:32.2 |
HIP 113980 |
7.02 |
| 2026-09-25 00:00 |
23:04:34.41 |
+04:03:32.1 |
HIP 113980 |
11.88 |
| 2026-09-25 12:00 |
23:04:07.57 |
+04:00:31.5 |
HIP 113889 |
11.92 |
| 2026-09-26 00:00 |
23:03:40.99 |
+03:57:30.5 |
HIP 113889 |
8.79 |
| 2026-09-26 12:00 |
23:03:14.69 |
+03:54:29.1 |
HIP 113889 |
10.83 |
| 2026-09-27 00:00 |
23:02:48.68 |
+03:51:27.4 |
HIP 113889 |
16.10 |
| 2026-09-27 12:00 |
23:02:22.96 |
+03:48:25.5 |
HIP 113705 |
19.26 |
| 2026-09-28 00:00 |
23:01:57.55 |
+03:45:23.4 |
HIP 113705 |
13.97 |
| 2026-09-28 12:00 |
23:01:32.45 |
+03:42:21.3 |
HIP 113705 |
10.85 |
| 2026-09-29 00:00 |
23:01:07.67 |
+03:39:19.2 |
HIP 113624 |
7.49 |
| 2026-09-29 12:00 |
23:00:43.23 |
+03:36:17.1 |
HIP 113624 |
1.42 |
| 2026-09-30 00:00 |
23:00:19.12 |
+03:33:15.2 |
HIP 113624 |
6.31 |
| 2026-09-30 12:00 |
22:59:55.36 |
+03:30:13.5 |
HIP 113624 |
12.89 |
| 2026-10-01 00:00 |
22:59:31.95 |
+03:27:12.1 |
HIP 113441 |
15.30 |
| 2026-10-01 12:00 |
22:59:08.91 |
+03:24:11.0 |
HIP 113441 |
9.91 |
| 2026-10-02 00:00 |
22:58:46.24 |
+03:21:10.3 |
HIP 113441 |
6.89 |
| 2026-10-02 12:00 |
22:58:23.95 |
+03:18:10.1 |
HIP 113441 |
8.86 |
| 2026-10-03 00:00 |
22:58:02.04 |
+03:15:10.5 |
HIP 113441 |
13.70 |
| 2026-10-03 12:00 |
22:57:40.53 |
+03:12:11.5 |
HIP 113441 |
19.29 |
| 2026-10-04 00:00 |
22:57:19.42 |
+03:09:13.2 |
HIP 113441 |
25.05 |
| 2026-10-04 12:00 |
22:56:58.72 |
+03:06:15.7 |
HIP 113198 |
24.51 |
| 2026-10-05 00:00 |
22:56:38.43 |
+03:03:19.0 |
HIP 113198 |
21.23 |
| 2026-10-05 12:00 |
22:56:18.57 |
+03:00:23.2 |
HIP 113198 |
19.27 |
| 2026-10-06 00:00 |
22:55:59.14 |
+02:57:28.3 |
HIP 113198 |
18.96 |
| 2026-10-06 12:00 |
22:55:40.14 |
+02:54:34.6 |
HIP 113198 |
20.29 |
| 2026-10-07 00:00 |
22:55:21.59 |
+02:51:41.9 |
HIP 113198 |
22.91 |
| 2026-10-07 12:00 |
22:55:03.48 |
+02:48:50.4 |
HIP 113198 |
26.36 |
| 2026-10-08 00:00 |
22:54:45.83 |
+02:46:00.1 |
HIP 113000 |
29.59 |
| 2026-10-08 12:00 |
22:54:28.65 |
+02:43:11.2 |
HIP 113000 |
24.46 |
| 2026-10-09 00:00 |
22:54:11.93 |
+02:40:23.6 |
HIP 113000 |
19.44 |
| 2026-10-09 12:00 |
22:53:55.68 |
+02:37:37.4 |
HIP 113000 |
14.54 |
| 2026-10-10 00:00 |
22:53:39.91 |
+02:34:52.8 |
HIP 113000 |
9.77 |
| 2026-10-10 12:00 |
22:53:24.62 |
+02:32:09.7 |
HIP 113000 |
5.17 |
| 2026-10-11 00:00 |
22:53:09.82 |
+02:29:28.2 |
HIP 113000 |
1.49 |