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) |
| 2026-03-26 00:00 |
06:38:45.03 |
+47:04:19.9 |
HIP 31675 |
21.52 |
| 2026-03-26 12:00 |
06:38:42.88 |
+47:03:51.4 |
HIP 31675 |
20.92 |
| 2026-03-27 00:00 |
06:38:40.81 |
+47:03:22.8 |
HIP 31675 |
20.33 |
| 2026-03-27 12:00 |
06:38:38.84 |
+47:02:54.2 |
HIP 31675 |
19.75 |
| 2026-03-28 00:00 |
06:38:36.95 |
+47:02:25.5 |
HIP 31675 |
19.18 |
| 2026-03-28 12:00 |
06:38:35.15 |
+47:01:56.9 |
HIP 31675 |
18.61 |
| 2026-03-29 00:00 |
06:38:33.43 |
+47:01:28.2 |
HIP 31675 |
18.05 |
| 2026-03-29 12:00 |
06:38:31.81 |
+47:00:59.4 |
HIP 31675 |
17.50 |
| 2026-03-30 00:00 |
06:38:30.27 |
+47:00:30.7 |
HIP 31675 |
16.95 |
| 2026-03-30 12:00 |
06:38:28.81 |
+47:00:01.9 |
HIP 31675 |
16.41 |
| 2026-03-31 00:00 |
06:38:27.44 |
+46:59:33.1 |
HIP 31675 |
15.88 |
| 2026-03-31 12:00 |
06:38:26.16 |
+46:59:04.3 |
HIP 31675 |
15.35 |
| 2026-04-01 00:00 |
06:38:24.97 |
+46:58:35.5 |
HIP 31675 |
14.84 |
| 2026-04-01 12:00 |
06:38:23.86 |
+46:58:06.7 |
HIP 31675 |
14.33 |
| 2026-04-02 00:00 |
06:38:22.84 |
+46:57:37.9 |
HIP 31675 |
13.82 |
| 2026-04-02 12:00 |
06:38:21.90 |
+46:57:09.1 |
HIP 31675 |
13.33 |
| 2026-04-03 00:00 |
06:38:21.04 |
+46:56:40.2 |
HIP 31675 |
12.85 |
| 2026-04-03 12:00 |
06:38:20.27 |
+46:56:11.4 |
HIP 31675 |
12.37 |
| 2026-04-04 00:00 |
06:38:19.59 |
+46:55:42.6 |
HIP 31675 |
11.90 |
| 2026-04-04 12:00 |
06:38:18.99 |
+46:55:13.9 |
HIP 31675 |
11.45 |
| 2026-04-05 00:00 |
06:38:18.47 |
+46:54:45.1 |
HIP 31675 |
11.01 |
| 2026-04-05 12:00 |
06:38:18.04 |
+46:54:16.3 |
HIP 31675 |
10.57 |
| 2026-04-06 00:00 |
06:38:17.69 |
+46:53:47.6 |
HIP 31675 |
10.16 |
| 2026-04-06 12:00 |
06:38:17.42 |
+46:53:18.9 |
HIP 31675 |
9.76 |
| 2026-04-07 00:00 |
06:38:17.24 |
+46:52:50.2 |
HIP 31675 |
9.37 |
| 2026-04-07 12:00 |
06:38:17.14 |
+46:52:21.5 |
HIP 31675 |
9.00 |
| 2026-04-08 00:00 |
06:38:17.12 |
+46:51:52.9 |
HIP 31675 |
8.66 |
| 2026-04-08 12:00 |
06:38:17.18 |
+46:51:24.3 |
HIP 31675 |
8.34 |
| 2026-04-09 00:00 |
06:38:17.33 |
+46:50:55.8 |
HIP 31675 |
8.05 |
| 2026-04-09 12:00 |
06:38:17.55 |
+46:50:27.2 |
HIP 31675 |
7.78 |
| 2026-04-10 00:00 |
06:38:17.86 |
+46:49:58.8 |
HIP 31675 |
7.55 |
| 2026-04-10 12:00 |
06:38:18.25 |
+46:49:30.3 |
HIP 31675 |
7.35 |
| 2026-04-11 00:00 |
06:38:18.72 |
+46:49:02.0 |
HIP 31675 |
7.20 |
| 2026-04-11 12:00 |
06:38:19.27 |
+46:48:33.6 |
HIP 31675 |
7.08 |
| 2026-04-12 00:00 |
06:38:19.90 |
+46:48:05.4 |
HIP 31675 |
7.02 |
| 2026-04-12 12:00 |
06:38:20.61 |
+46:47:37.1 |
HIP 31675 |
6.99 |
| 2026-04-13 00:00 |
06:38:21.40 |
+46:47:09.0 |
HIP 31675 |
7.02 |
| 2026-04-13 12:00 |
06:38:22.27 |
+46:46:40.9 |
HIP 31675 |
7.09 |
| 2026-04-14 00:00 |
06:38:23.22 |
+46:46:12.9 |
HIP 31675 |
7.21 |
| 2026-04-14 12:00 |
06:38:24.24 |
+46:45:44.9 |
HIP 31675 |
7.37 |
| 2026-04-15 00:00 |
06:38:25.35 |
+46:45:17.0 |
HIP 31675 |
7.58 |
| 2026-04-15 12:00 |
06:38:26.53 |
+46:44:49.2 |
HIP 31675 |
7.82 |
| 2026-04-16 00:00 |
06:38:27.79 |
+46:44:21.4 |
HIP 31675 |
8.10 |