メタデータ
| 項目 |
値 |
| Designation |
C/2019 G4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-09-16T16:19:43.942080Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:38Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
13.800 |
| 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) |
2020-01-04.0000000 |
| e |
1.00013440 |
| q (au) |
5.864733 |
| a (au) |
-43634.843792 |
| i (deg) |
138.390694 |
| Ω (om, deg) |
130.459931 |
| ω (w, deg) |
287.998779 |
| M (ma, deg) |
0.000051 |
等級
散乱 + 全体線形
$$
M_a = (4.578 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.578 |
| n |
6.000 |
| gf |
0.861 |
| gb |
-0.985 |
| k |
1.000 |
| δ90 |
3.283 |
| 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) |
| 2026-05-12 00:00 |
06:41:09.15 |
+46:22:58.7 |
HIP 31974 |
2.82 |
| 2026-05-12 12:00 |
06:41:13.89 |
+46:22:38.0 |
HIP 31974 |
3.39 |
| 2026-05-13 00:00 |
06:41:18.67 |
+46:22:17.4 |
HIP 31974 |
4.07 |
| 2026-05-13 12:00 |
06:41:23.51 |
+46:21:57.1 |
HIP 31974 |
4.84 |
| 2026-05-14 00:00 |
06:41:28.40 |
+46:21:37.0 |
HIP 31974 |
5.66 |
| 2026-05-14 12:00 |
06:41:33.34 |
+46:21:17.0 |
HIP 31974 |
6.50 |
| 2026-05-15 00:00 |
06:41:38.34 |
+46:20:57.2 |
HIP 31974 |
7.38 |
| 2026-05-15 12:00 |
06:41:43.38 |
+46:20:37.6 |
HIP 31974 |
8.27 |
| 2026-05-16 00:00 |
06:41:48.48 |
+46:20:18.2 |
HIP 31974 |
9.18 |
| 2026-05-16 12:00 |
06:41:53.62 |
+46:19:59.0 |
HIP 31974 |
10.10 |
| 2026-05-17 00:00 |
06:41:58.81 |
+46:19:40.0 |
HIP 31974 |
11.04 |
| 2026-05-17 12:00 |
06:42:04.06 |
+46:19:21.2 |
HIP 31974 |
11.98 |
| 2026-05-18 00:00 |
06:42:09.35 |
+46:19:02.6 |
HIP 31974 |
12.93 |
| 2026-05-18 12:00 |
06:42:14.69 |
+46:18:44.1 |
HIP 31974 |
13.90 |
| 2026-05-19 00:00 |
06:42:20.07 |
+46:18:25.9 |
HIP 31974 |
14.87 |
| 2026-05-19 12:00 |
06:42:25.51 |
+46:18:07.9 |
HIP 31974 |
15.85 |
| 2026-05-20 00:00 |
06:42:30.99 |
+46:17:50.0 |
HIP 31974 |
16.84 |
| 2026-05-20 12:00 |
06:42:36.51 |
+46:17:32.4 |
HIP 31974 |
17.83 |
| 2026-05-21 00:00 |
06:42:42.08 |
+46:17:15.0 |
HIP 31974 |
18.83 |
| 2026-05-21 12:00 |
06:42:47.69 |
+46:16:57.8 |
HIP 31974 |
19.84 |
| 2026-05-22 00:00 |
06:42:53.35 |
+46:16:40.7 |
HIP 31974 |
20.86 |
| 2026-05-22 12:00 |
06:42:59.05 |
+46:16:23.9 |
HIP 31974 |
21.88 |
| 2026-05-23 00:00 |
06:43:04.79 |
+46:16:07.3 |
HIP 31974 |
22.91 |
| 2026-05-23 12:00 |
06:43:10.58 |
+46:15:51.0 |
HIP 31974 |
23.95 |
| 2026-05-24 00:00 |
06:43:16.41 |
+46:15:34.8 |
HIP 31974 |
24.99 |
| 2026-05-24 12:00 |
06:43:22.27 |
+46:15:18.8 |
HIP 32341 |
24.26 |
| 2026-05-25 00:00 |
06:43:28.18 |
+46:15:03.1 |
HIP 32341 |
23.34 |
| 2026-05-25 12:00 |
06:43:34.13 |
+46:14:47.5 |
HIP 32341 |
22.43 |
| 2026-05-26 00:00 |
06:43:40.12 |
+46:14:32.2 |
HIP 32341 |
21.54 |
| 2026-05-26 12:00 |
06:43:46.14 |
+46:14:17.1 |
HIP 32341 |
20.66 |
| 2026-05-27 00:00 |
06:43:52.21 |
+46:14:02.2 |
HIP 32341 |
19.80 |
| 2026-05-27 12:00 |
06:43:58.31 |
+46:13:47.5 |
HIP 32341 |
18.96 |
| 2026-05-28 00:00 |
06:44:04.45 |
+46:13:33.0 |
HIP 32341 |
18.14 |
| 2026-05-28 12:00 |
06:44:10.63 |
+46:13:18.8 |
HIP 32341 |
17.36 |
| 2026-05-29 00:00 |
06:44:16.84 |
+46:13:04.8 |
HIP 32341 |
16.61 |
| 2026-05-29 12:00 |
06:44:23.09 |
+46:12:51.0 |
HIP 32341 |
15.90 |
| 2026-05-30 00:00 |
06:44:29.38 |
+46:12:37.4 |
HIP 32341 |
15.24 |
| 2026-05-30 12:00 |
06:44:35.70 |
+46:12:24.0 |
HIP 32341 |
14.64 |
| 2026-05-31 00:00 |
06:44:42.05 |
+46:12:10.9 |
HIP 32341 |
14.10 |
| 2026-05-31 12:00 |
06:44:48.44 |
+46:11:58.0 |
HIP 32341 |
13.64 |
| 2026-06-01 00:00 |
06:44:54.87 |
+46:11:45.3 |
HIP 32341 |
13.25 |
| 2026-06-01 12:00 |
06:45:01.32 |
+46:11:32.9 |
HIP 32341 |
12.97 |
| 2026-06-02 00:00 |
06:45:07.81 |
+46:11:20.6 |
HIP 32341 |
12.78 |