メタデータ
| 項目 |
値 |
| Designation |
C/2021 G3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-18T17:46:41.067840Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:00Z |
| Obs used |
63 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
14.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-07-12.0000000 |
| e |
1.00119266 |
| q (au) |
5.181101 |
| a (au) |
-4344.158799 |
| i (deg) |
102.884132 |
| Ω (om, deg) |
147.418441 |
| ω (w, deg) |
10.663883 |
| M (ma, deg) |
-0.000340 |
等級
散乱 + 全体線形
$$
M_a = (14.019 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.019 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.990 |
| 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) |
| 2026-09-20 00:00 |
20:51:07.31 |
+57:17:25.4 |
HIP 102943 |
13.89 |
| 2026-09-20 12:00 |
20:50:57.60 |
+57:15:04.0 |
HIP 102943 |
11.90 |
| 2026-09-21 00:00 |
20:50:48.03 |
+57:12:41.8 |
HIP 102943 |
10.23 |
| 2026-09-21 12:00 |
20:50:38.58 |
+57:10:18.9 |
HIP 102943 |
9.04 |
| 2026-09-22 00:00 |
20:50:29.26 |
+57:07:55.4 |
HIP 102943 |
8.55 |
| 2026-09-22 12:00 |
20:50:20.07 |
+57:05:31.1 |
HIP 102943 |
8.89 |
| 2026-09-23 00:00 |
20:50:11.01 |
+57:03:06.2 |
HIP 102943 |
9.96 |
| 2026-09-23 12:00 |
20:50:02.08 |
+57:00:40.7 |
HIP 102943 |
11.57 |
| 2026-09-24 00:00 |
20:49:53.29 |
+56:58:14.5 |
HIP 102858 |
10.88 |
| 2026-09-24 12:00 |
20:49:44.62 |
+56:55:47.6 |
HIP 102858 |
9.13 |
| 2026-09-25 00:00 |
20:49:36.09 |
+56:53:20.2 |
HIP 102858 |
7.92 |
| 2026-09-25 12:00 |
20:49:27.69 |
+56:50:52.1 |
HIP 102858 |
7.52 |
| 2026-09-26 00:00 |
20:49:19.42 |
+56:48:23.4 |
HIP 102858 |
8.07 |
| 2026-09-26 12:00 |
20:49:11.29 |
+56:45:54.2 |
HIP 102858 |
9.39 |
| 2026-09-27 00:00 |
20:49:03.29 |
+56:43:24.3 |
HIP 102858 |
11.21 |
| 2026-09-27 12:00 |
20:48:55.42 |
+56:40:53.9 |
HIP 102858 |
13.34 |
| 2026-09-28 00:00 |
20:48:47.69 |
+56:38:23.0 |
HIP 102858 |
15.65 |
| 2026-09-28 12:00 |
20:48:40.09 |
+56:35:51.4 |
HIP 102858 |
18.07 |
| 2026-09-29 00:00 |
20:48:32.63 |
+56:33:19.4 |
HIP 102858 |
20.57 |
| 2026-09-29 12:00 |
20:48:25.30 |
+56:30:46.8 |
HIP 102858 |
23.11 |
| 2026-09-30 00:00 |
20:48:18.11 |
+56:28:13.7 |
HIP 102858 |
25.69 |
| 2026-09-30 12:00 |
20:48:11.05 |
+56:25:40.1 |
HIP 102638 |
24.28 |
| 2026-10-01 00:00 |
20:48:04.13 |
+56:23:06.0 |
HIP 102638 |
21.63 |
| 2026-10-01 12:00 |
20:47:57.34 |
+56:20:31.4 |
HIP 102638 |
18.99 |
| 2026-10-02 00:00 |
20:47:50.70 |
+56:17:56.3 |
HIP 102638 |
16.38 |
| 2026-10-02 12:00 |
20:47:44.18 |
+56:15:20.8 |
HIP 102638 |
13.82 |
| 2026-10-03 00:00 |
20:47:37.81 |
+56:12:44.8 |
HIP 102638 |
11.33 |
| 2026-10-03 12:00 |
20:47:31.57 |
+56:10:08.4 |
HIP 102638 |
8.97 |
| 2026-10-04 00:00 |
20:47:25.47 |
+56:07:31.6 |
HIP 102638 |
6.91 |
| 2026-10-04 12:00 |
20:47:19.50 |
+56:04:54.3 |
HIP 102638 |
5.46 |
| 2026-10-05 00:00 |
20:47:13.68 |
+56:02:16.6 |
HIP 102638 |
5.18 |
| 2026-10-05 12:00 |
20:47:07.99 |
+55:59:38.6 |
HIP 102638 |
6.23 |
| 2026-10-06 00:00 |
20:47:02.44 |
+55:57:00.1 |
HIP 102597 |
5.66 |
| 2026-10-06 12:00 |
20:46:57.03 |
+55:54:21.3 |
HIP 102597 |
5.02 |
| 2026-10-07 00:00 |
20:46:51.76 |
+55:51:42.1 |
HIP 102597 |
5.77 |
| 2026-10-07 12:00 |
20:46:46.62 |
+55:49:02.5 |
HIP 102597 |
7.51 |
| 2026-10-08 00:00 |
20:46:41.63 |
+55:46:22.7 |
HIP 102597 |
9.72 |
| 2026-10-08 12:00 |
20:46:36.77 |
+55:43:42.5 |
HIP 102597 |
12.15 |
| 2026-10-09 00:00 |
20:46:32.05 |
+55:41:02.0 |
HIP 102598 |
10.94 |
| 2026-10-09 12:00 |
20:46:27.47 |
+55:38:21.1 |
HIP 102598 |
10.09 |
| 2026-10-10 00:00 |
20:46:23.03 |
+55:35:40.0 |
HIP 102598 |
9.93 |
| 2026-10-10 12:00 |
20:46:18.73 |
+55:32:58.7 |
HIP 102598 |
10.50 |
| 2026-10-11 00:00 |
20:46:14.57 |
+55:30:17.0 |
HIP 102598 |
11.69 |