メタデータ
| 項目 |
値 |
| Designation |
C/2019 JU6 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-01T01:29:57.295680Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:34Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-05-19.0000000 |
| e |
0.99939729 |
| q (au) |
2.045767 |
| a (au) |
3394.271759 |
| i (deg) |
148.291676 |
| Ω (om, deg) |
21.701965 |
| ω (w, deg) |
94.917780 |
| M (ma, deg) |
359.999935 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
09:19:31.83 |
-11:51:53.7 |
HIP 45751 |
7.50 |
| 2026-05-12 12:00 |
09:19:31.55 |
-11:51:11.4 |
HIP 45751 |
8.16 |
| 2026-05-13 00:00 |
09:19:31.32 |
-11:50:29.4 |
HIP 45751 |
8.81 |
| 2026-05-13 12:00 |
09:19:31.14 |
-11:49:47.7 |
HIP 45751 |
9.47 |
| 2026-05-14 00:00 |
09:19:31.02 |
-11:49:06.3 |
HIP 45751 |
10.11 |
| 2026-05-14 12:00 |
09:19:30.95 |
-11:48:25.2 |
HIP 45751 |
10.76 |
| 2026-05-15 00:00 |
09:19:30.93 |
-11:47:44.3 |
HIP 45751 |
11.40 |
| 2026-05-15 12:00 |
09:19:30.96 |
-11:47:03.8 |
HIP 45735 |
10.78 |
| 2026-05-16 00:00 |
09:19:31.05 |
-11:46:23.6 |
HIP 45735 |
10.12 |
| 2026-05-16 12:00 |
09:19:31.18 |
-11:45:43.7 |
HIP 45735 |
9.47 |
| 2026-05-17 00:00 |
09:19:31.37 |
-11:45:04.1 |
HIP 45735 |
8.82 |
| 2026-05-17 12:00 |
09:19:31.61 |
-11:44:24.9 |
HIP 45735 |
8.18 |
| 2026-05-18 00:00 |
09:19:31.90 |
-11:43:45.9 |
HIP 45735 |
7.55 |
| 2026-05-18 12:00 |
09:19:32.24 |
-11:43:07.3 |
HIP 45735 |
6.94 |
| 2026-05-19 00:00 |
09:19:32.64 |
-11:42:29.0 |
HIP 45735 |
6.34 |
| 2026-05-19 12:00 |
09:19:33.08 |
-11:41:51.0 |
HIP 45735 |
5.76 |
| 2026-05-20 00:00 |
09:19:33.58 |
-11:41:13.3 |
HIP 45735 |
5.21 |
| 2026-05-20 12:00 |
09:19:34.12 |
-11:40:35.9 |
HIP 45735 |
4.68 |
| 2026-05-21 00:00 |
09:19:34.72 |
-11:39:58.9 |
HIP 45735 |
4.20 |
| 2026-05-21 12:00 |
09:19:35.36 |
-11:39:22.3 |
HIP 45735 |
3.78 |
| 2026-05-22 00:00 |
09:19:36.05 |
-11:38:45.9 |
HIP 45735 |
3.43 |
| 2026-05-22 12:00 |
09:19:36.80 |
-11:38:09.9 |
HIP 45735 |
3.18 |
| 2026-05-23 00:00 |
09:19:37.59 |
-11:37:34.2 |
HIP 45735 |
3.06 |
| 2026-05-23 12:00 |
09:19:38.43 |
-11:36:58.9 |
HIP 45735 |
3.08 |
| 2026-05-24 00:00 |
09:19:39.32 |
-11:36:23.9 |
HIP 45735 |
3.23 |
| 2026-05-24 12:00 |
09:19:40.26 |
-11:35:49.2 |
HIP 45735 |
3.50 |
| 2026-05-25 00:00 |
09:19:41.25 |
-11:35:14.9 |
HIP 45735 |
3.86 |
| 2026-05-25 12:00 |
09:19:42.28 |
-11:34:40.9 |
HIP 45735 |
4.29 |
| 2026-05-26 00:00 |
09:19:43.37 |
-11:34:07.3 |
HIP 45735 |
4.77 |
| 2026-05-26 12:00 |
09:19:44.50 |
-11:33:34.0 |
HIP 45735 |
5.29 |
| 2026-05-27 00:00 |
09:19:45.68 |
-11:33:01.1 |
HIP 45735 |
5.83 |
| 2026-05-27 12:00 |
09:19:46.90 |
-11:32:28.5 |
HIP 45735 |
6.39 |
| 2026-05-28 00:00 |
09:19:48.17 |
-11:31:56.2 |
HIP 45735 |
6.97 |
| 2026-05-28 12:00 |
09:19:49.49 |
-11:31:24.3 |
HIP 45735 |
7.56 |
| 2026-05-29 00:00 |
09:19:50.86 |
-11:30:52.8 |
HIP 45735 |
8.16 |
| 2026-05-29 12:00 |
09:19:52.27 |
-11:30:21.6 |
HIP 45735 |
8.76 |
| 2026-05-30 00:00 |
09:19:53.72 |
-11:29:50.8 |
HIP 45735 |
9.38 |
| 2026-05-30 12:00 |
09:19:55.23 |
-11:29:20.3 |
HIP 45735 |
9.99 |
| 2026-05-31 00:00 |
09:19:56.78 |
-11:28:50.2 |
HIP 45735 |
10.62 |
| 2026-05-31 12:00 |
09:19:58.37 |
-11:28:20.5 |
HIP 45744 |
11.18 |
| 2026-06-01 00:00 |
09:20:00.01 |
-11:27:51.1 |
HIP 45744 |
11.00 |
| 2026-06-01 12:00 |
09:20:01.69 |
-11:27:22.1 |
HIP 45744 |
10.86 |
| 2026-06-02 00:00 |
09:20:03.42 |
-11:26:53.4 |
HIP 45744 |
10.77 |