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) |
| 2026-07-29 00:00 |
21:16:46.09 |
+59:51:13.1 |
HIP 105096 |
9.15 |
| 2026-07-29 12:00 |
21:16:29.59 |
+59:50:49.3 |
HIP 105096 |
10.62 |
| 2026-07-30 00:00 |
21:16:13.06 |
+59:50:24.3 |
HIP 104883 |
11.99 |
| 2026-07-30 12:00 |
21:15:56.52 |
+59:49:58.0 |
HIP 104883 |
9.92 |
| 2026-07-31 00:00 |
21:15:39.95 |
+59:49:30.4 |
HIP 104883 |
7.86 |
| 2026-07-31 12:00 |
21:15:23.37 |
+59:49:01.5 |
HIP 104883 |
5.83 |
| 2026-08-01 00:00 |
21:15:06.78 |
+59:48:31.4 |
HIP 104883 |
3.92 |
| 2026-08-01 12:00 |
21:14:50.17 |
+59:48:00.0 |
HIP 104883 |
2.41 |
| 2026-08-02 00:00 |
21:14:33.55 |
+59:47:27.4 |
HIP 104883 |
2.34 |
| 2026-08-02 12:00 |
21:14:16.92 |
+59:46:53.4 |
HIP 104883 |
3.80 |
| 2026-08-03 00:00 |
21:14:00.28 |
+59:46:18.2 |
HIP 104883 |
5.73 |
| 2026-08-03 12:00 |
21:13:43.64 |
+59:45:41.7 |
HIP 104883 |
7.79 |
| 2026-08-04 00:00 |
21:13:26.99 |
+59:45:03.9 |
HIP 104883 |
9.90 |
| 2026-08-04 12:00 |
21:13:10.34 |
+59:44:24.9 |
HIP 104883 |
12.05 |
| 2026-08-05 00:00 |
21:12:53.69 |
+59:43:44.6 |
HIP 104883 |
14.21 |
| 2026-08-05 12:00 |
21:12:37.04 |
+59:43:03.0 |
HIP 104883 |
16.39 |
| 2026-08-06 00:00 |
21:12:20.40 |
+59:42:20.1 |
HIP 104642 |
17.34 |
| 2026-08-06 12:00 |
21:12:03.76 |
+59:41:35.9 |
HIP 104515 |
15.28 |
| 2026-08-07 00:00 |
21:11:47.12 |
+59:40:50.4 |
HIP 104515 |
13.06 |
| 2026-08-07 12:00 |
21:11:30.49 |
+59:40:03.7 |
HIP 104515 |
10.84 |
| 2026-08-08 00:00 |
21:11:13.88 |
+59:39:15.7 |
HIP 104515 |
8.62 |
| 2026-08-08 12:00 |
21:10:57.27 |
+59:38:26.4 |
HIP 104515 |
6.39 |
| 2026-08-09 00:00 |
21:10:40.68 |
+59:37:35.8 |
HIP 104515 |
4.20 |
| 2026-08-09 12:00 |
21:10:24.11 |
+59:36:43.9 |
HIP 104515 |
2.12 |
| 2026-08-10 00:00 |
21:10:07.55 |
+59:35:50.7 |
HIP 104515 |
1.27 |
| 2026-08-10 12:00 |
21:09:51.01 |
+59:34:56.3 |
HIP 104515 |
3.01 |
| 2026-08-11 00:00 |
21:09:34.50 |
+59:34:00.6 |
HIP 104515 |
5.19 |
| 2026-08-11 12:00 |
21:09:18.01 |
+59:33:03.6 |
HIP 104515 |
7.44 |
| 2026-08-12 00:00 |
21:09:01.54 |
+59:32:05.3 |
HIP 104515 |
9.72 |
| 2026-08-12 12:00 |
21:08:45.10 |
+59:31:05.8 |
HIP 104515 |
12.01 |
| 2026-08-13 00:00 |
21:08:28.69 |
+59:30:05.0 |
HIP 104515 |
14.31 |
| 2026-08-13 12:00 |
21:08:12.31 |
+59:29:02.9 |
HIP 104176 |
13.86 |
| 2026-08-14 00:00 |
21:07:55.96 |
+59:27:59.5 |
HIP 104176 |
11.64 |
| 2026-08-14 12:00 |
21:07:39.65 |
+59:26:54.9 |
HIP 104176 |
9.47 |
| 2026-08-15 00:00 |
21:07:23.38 |
+59:25:49.0 |
HIP 104176 |
7.41 |
| 2026-08-15 12:00 |
21:07:07.14 |
+59:24:41.9 |
HIP 104176 |
5.58 |
| 2026-08-16 00:00 |
21:06:50.95 |
+59:23:33.5 |
HIP 104176 |
4.30 |
| 2026-08-16 12:00 |
21:06:34.79 |
+59:22:23.8 |
HIP 104176 |
4.14 |
| 2026-08-17 00:00 |
21:06:18.68 |
+59:21:12.9 |
HIP 104176 |
5.21 |
| 2026-08-17 12:00 |
21:06:02.62 |
+59:20:00.8 |
HIP 104176 |
6.97 |
| 2026-08-18 00:00 |
21:05:46.60 |
+59:18:47.4 |
HIP 104176 |
9.03 |
| 2026-08-18 12:00 |
21:05:30.64 |
+59:17:32.8 |
HIP 104176 |
11.23 |
| 2026-08-19 00:00 |
21:05:14.72 |
+59:16:17.0 |
HIP 104021 |
13.38 |