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 |
0.996 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.980 |
| 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 |
21:30:28.95 |
+55:17:14.7 |
HIP 106052 |
15.78 |
| 2026-03-26 12:00 |
21:30:40.64 |
+55:18:23.4 |
HIP 106052 |
16.75 |
| 2026-03-27 00:00 |
21:30:52.23 |
+55:19:32.7 |
HIP 106052 |
17.87 |
| 2026-03-27 12:00 |
21:31:03.74 |
+55:20:42.7 |
HIP 106052 |
19.12 |
| 2026-03-28 00:00 |
21:31:15.15 |
+55:21:53.2 |
HIP 106052 |
20.48 |
| 2026-03-28 12:00 |
21:31:26.47 |
+55:23:04.4 |
HIP 106052 |
21.92 |
| 2026-03-29 00:00 |
21:31:37.70 |
+55:24:16.1 |
HIP 106052 |
23.43 |
| 2026-03-29 12:00 |
21:31:48.84 |
+55:25:28.4 |
HIP 106052 |
24.99 |
| 2026-03-30 00:00 |
21:31:59.88 |
+55:26:41.3 |
HIP 106504 |
25.48 |
| 2026-03-30 12:00 |
21:32:10.83 |
+55:27:54.7 |
HIP 106504 |
25.12 |
| 2026-03-31 00:00 |
21:32:21.68 |
+55:29:08.7 |
HIP 106492 |
23.93 |
| 2026-03-31 12:00 |
21:32:32.44 |
+55:30:23.3 |
HIP 106492 |
22.00 |
| 2026-04-01 00:00 |
21:32:43.10 |
+55:31:38.4 |
HIP 106492 |
20.08 |
| 2026-04-01 12:00 |
21:32:53.67 |
+55:32:54.1 |
HIP 106492 |
18.17 |
| 2026-04-02 00:00 |
21:33:04.14 |
+55:34:10.3 |
HIP 106492 |
16.27 |
| 2026-04-02 12:00 |
21:33:14.51 |
+55:35:27.0 |
HIP 106492 |
14.39 |
| 2026-04-03 00:00 |
21:33:24.78 |
+55:36:44.3 |
HIP 106492 |
12.52 |
| 2026-04-03 12:00 |
21:33:34.96 |
+55:38:02.1 |
HIP 106492 |
10.68 |
| 2026-04-04 00:00 |
21:33:45.03 |
+55:39:20.4 |
HIP 106492 |
8.88 |
| 2026-04-04 12:00 |
21:33:55.01 |
+55:40:39.2 |
HIP 106492 |
7.15 |
| 2026-04-05 00:00 |
21:34:04.88 |
+55:41:58.5 |
HIP 106492 |
5.53 |
| 2026-04-05 12:00 |
21:34:14.66 |
+55:43:18.3 |
HIP 106492 |
4.16 |
| 2026-04-06 00:00 |
21:34:24.33 |
+55:44:38.6 |
HIP 106492 |
3.37 |
| 2026-04-06 12:00 |
21:34:33.90 |
+55:45:59.4 |
HIP 106492 |
3.53 |
| 2026-04-07 00:00 |
21:34:43.37 |
+55:47:20.6 |
HIP 106492 |
4.55 |
| 2026-04-07 12:00 |
21:34:52.73 |
+55:48:42.3 |
HIP 106492 |
6.00 |
| 2026-04-08 00:00 |
21:35:01.99 |
+55:50:04.5 |
HIP 106492 |
7.64 |
| 2026-04-08 12:00 |
21:35:11.15 |
+55:51:27.1 |
HIP 106492 |
9.36 |
| 2026-04-09 00:00 |
21:35:20.20 |
+55:52:50.2 |
HIP 106492 |
11.12 |
| 2026-04-09 12:00 |
21:35:29.15 |
+55:54:13.8 |
HIP 106492 |
12.90 |
| 2026-04-10 00:00 |
21:35:37.98 |
+55:55:37.7 |
HIP 106492 |
14.70 |
| 2026-04-10 12:00 |
21:35:46.72 |
+55:57:02.1 |
HIP 106492 |
16.51 |
| 2026-04-11 00:00 |
21:35:55.34 |
+55:58:27.0 |
HIP 106492 |
18.31 |
| 2026-04-11 12:00 |
21:36:03.86 |
+55:59:52.2 |
HIP 106763 |
18.56 |
| 2026-04-12 00:00 |
21:36:12.26 |
+56:01:17.9 |
HIP 106763 |
18.86 |
| 2026-04-12 12:00 |
21:36:20.56 |
+56:02:43.9 |
HIP 106763 |
19.34 |
| 2026-04-13 00:00 |
21:36:28.74 |
+56:04:10.4 |
HIP 106763 |
20.01 |
| 2026-04-13 12:00 |
21:36:36.82 |
+56:05:37.2 |
HIP 106763 |
20.82 |
| 2026-04-14 00:00 |
21:36:44.78 |
+56:07:04.4 |
HIP 106763 |
21.78 |
| 2026-04-14 12:00 |
21:36:52.63 |
+56:08:32.0 |
HIP 106763 |
22.85 |
| 2026-04-15 00:00 |
21:37:00.37 |
+56:10:00.0 |
HIP 106763 |
24.02 |
| 2026-04-15 12:00 |
21:37:08.00 |
+56:11:28.3 |
HIP 106763 |
25.28 |
| 2026-04-16 00:00 |
21:37:15.51 |
+56:12:57.0 |
HIP 106763 |
26.61 |