メタデータ
| 項目 |
値 |
| Designation |
C/2020 H2 (Pruyne) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-04-27T14:08:36.116160Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:14Z |
| Obs used |
121 |
| NEO |
- |
| M1 |
18.900 |
| K1 |
22.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-05-25.0000000 |
| e |
0.99553868 |
| q (au) |
0.833616 |
| a (au) |
186.853978 |
| i (deg) |
125.044340 |
| Ω (om, deg) |
277.635070 |
| ω (w, deg) |
26.692025 |
| M (ma, deg) |
0.010577 |
等級
散乱 + 全体線形
$$
M_a = (17.971 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.971 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.893 |
| δ90 |
10.000 |
| 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) |
| 2026-06-01 00:00 |
06:21:34.07 |
+21:35:19.4 |
HIP 30241 |
20.96 |
| 2026-06-01 12:00 |
06:21:39.90 |
+21:35:11.9 |
HIP 30241 |
20.73 |
| 2026-06-02 00:00 |
06:21:45.75 |
+21:35:04.4 |
HIP 30241 |
20.60 |
| 2026-06-02 12:00 |
06:21:51.61 |
+21:34:56.7 |
HIP 30241 |
20.55 |
| 2026-06-03 00:00 |
06:21:57.50 |
+21:34:49.1 |
HIP 30241 |
20.60 |
| 2026-06-03 12:00 |
06:22:03.40 |
+21:34:41.4 |
HIP 30241 |
20.74 |
| 2026-06-04 00:00 |
06:22:09.32 |
+21:34:33.7 |
HIP 30241 |
20.97 |
| 2026-06-04 12:00 |
06:22:15.26 |
+21:34:25.9 |
HIP 30241 |
21.28 |
| 2026-06-05 00:00 |
06:22:21.22 |
+21:34:18.1 |
HIP 30241 |
21.69 |
| 2026-06-05 12:00 |
06:22:27.19 |
+21:34:10.3 |
HIP 30241 |
22.17 |
| 2026-06-06 00:00 |
06:22:33.18 |
+21:34:02.4 |
HIP 30241 |
22.73 |
| 2026-06-06 12:00 |
06:22:39.18 |
+21:33:54.4 |
HIP 30241 |
23.37 |
| 2026-06-07 00:00 |
06:22:45.20 |
+21:33:46.4 |
HIP 30241 |
24.07 |
| 2026-06-07 12:00 |
06:22:51.24 |
+21:33:38.4 |
HIP 30241 |
24.83 |
| 2026-06-08 00:00 |
06:22:57.29 |
+21:33:30.4 |
HIP 30241 |
25.65 |
| 2026-06-08 12:00 |
06:23:03.35 |
+21:33:22.2 |
HIP 30241 |
26.52 |
| 2026-06-09 00:00 |
06:23:09.43 |
+21:33:14.1 |
HIP 30241 |
27.44 |
| 2026-06-09 12:00 |
06:23:15.52 |
+21:33:05.9 |
HIP 30241 |
28.40 |
| 2026-06-10 00:00 |
06:23:21.63 |
+21:32:57.7 |
HIP 30241 |
29.40 |
| 2026-06-10 12:00 |
06:23:27.74 |
+21:32:49.4 |
HIP 30241 |
30.44 |
| 2026-06-11 00:00 |
06:23:33.87 |
+21:32:41.1 |
HIP 30588 |
30.55 |
| 2026-06-11 12:00 |
06:23:40.02 |
+21:32:32.7 |
HIP 30588 |
29.18 |
| 2026-06-12 00:00 |
06:23:46.17 |
+21:32:24.3 |
HIP 30588 |
27.82 |
| 2026-06-12 12:00 |
06:23:52.34 |
+21:32:15.9 |
HIP 30588 |
26.46 |
| 2026-06-13 00:00 |
06:23:58.51 |
+21:32:07.4 |
HIP 30588 |
25.10 |
| 2026-06-13 12:00 |
06:24:04.70 |
+21:31:58.9 |
HIP 30588 |
23.76 |
| 2026-06-14 00:00 |
06:24:10.90 |
+21:31:50.3 |
HIP 30588 |
22.43 |
| 2026-06-14 12:00 |
06:24:17.10 |
+21:31:41.7 |
HIP 30588 |
21.10 |
| 2026-06-15 00:00 |
06:24:23.32 |
+21:31:33.0 |
HIP 30588 |
19.80 |
| 2026-06-15 12:00 |
06:24:29.54 |
+21:31:24.3 |
HIP 30588 |
18.51 |
| 2026-06-16 00:00 |
06:24:35.77 |
+21:31:15.6 |
HIP 30588 |
17.25 |
| 2026-06-16 12:00 |
06:24:42.01 |
+21:31:06.8 |
HIP 30588 |
16.03 |
| 2026-06-17 00:00 |
06:24:48.26 |
+21:30:58.0 |
HIP 30588 |
14.84 |
| 2026-06-17 12:00 |
06:24:54.51 |
+21:30:49.1 |
HIP 30588 |
13.71 |
| 2026-06-18 00:00 |
06:25:00.77 |
+21:30:40.2 |
HIP 30588 |
12.64 |
| 2026-06-18 12:00 |
06:25:07.04 |
+21:30:31.3 |
HIP 30588 |
11.65 |
| 2026-06-19 00:00 |
06:25:13.31 |
+21:30:22.3 |
HIP 30588 |
10.78 |
| 2026-06-19 12:00 |
06:25:19.58 |
+21:30:13.3 |
HIP 30588 |
10.05 |
| 2026-06-20 00:00 |
06:25:25.86 |
+21:30:04.2 |
HIP 30588 |
9.48 |
| 2026-06-20 12:00 |
06:25:32.15 |
+21:29:55.1 |
HIP 30588 |
9.12 |
| 2026-06-21 00:00 |
06:25:38.44 |
+21:29:45.9 |
HIP 30588 |
8.99 |
| 2026-06-21 12:00 |
06:25:44.73 |
+21:29:36.8 |
HIP 30588 |
9.10 |
| 2026-06-22 00:00 |
06:25:51.02 |
+21:29:27.5 |
HIP 30588 |
9.44 |