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) |
| 2026-07-29 00:00 |
09:27:01.53 |
-11:14:38.6 |
HIP 46167 |
36.21 |
| 2026-07-29 12:00 |
09:27:06.43 |
-11:14:54.1 |
HIP 46167 |
37.38 |
| 2026-07-30 00:00 |
09:27:11.34 |
-11:15:09.9 |
HIP 46167 |
38.55 |
| 2026-07-30 12:00 |
09:27:16.26 |
-11:15:26.1 |
HIP 46167 |
39.74 |
| 2026-07-31 00:00 |
09:27:21.18 |
-11:15:42.7 |
HIP 46167 |
40.93 |
| 2026-07-31 12:00 |
09:27:26.12 |
-11:15:59.6 |
HIP 46167 |
42.13 |
| 2026-08-01 00:00 |
09:27:31.06 |
-11:16:16.9 |
HIP 46167 |
43.33 |
| 2026-08-01 12:00 |
09:27:36.00 |
-11:16:34.5 |
HIP 46167 |
44.54 |
| 2026-08-02 00:00 |
09:27:40.96 |
-11:16:52.4 |
HIP 46167 |
45.76 |
| 2026-08-02 12:00 |
09:27:45.92 |
-11:17:10.7 |
HIP 46167 |
46.98 |
| 2026-08-03 00:00 |
09:27:50.88 |
-11:17:29.3 |
HIP 46167 |
48.21 |
| 2026-08-03 12:00 |
09:27:55.85 |
-11:17:48.3 |
HIP 46167 |
49.45 |
| 2026-08-04 00:00 |
09:28:00.83 |
-11:18:07.6 |
HIP 46167 |
50.68 |
| 2026-08-04 12:00 |
09:28:05.81 |
-11:18:27.3 |
HIP 46167 |
51.93 |
| 2026-08-05 00:00 |
09:28:10.80 |
-11:18:47.3 |
HIP 46167 |
53.17 |
| 2026-08-05 12:00 |
09:28:15.79 |
-11:19:07.6 |
HIP 46167 |
54.43 |
| 2026-08-06 00:00 |
09:28:20.78 |
-11:19:28.3 |
HIP 46167 |
55.68 |
| 2026-08-06 12:00 |
09:28:25.78 |
-11:19:49.3 |
HIP 46167 |
56.94 |
| 2026-08-07 00:00 |
09:28:30.78 |
-11:20:10.7 |
HIP 46167 |
58.20 |
| 2026-08-07 12:00 |
09:28:35.79 |
-11:20:32.3 |
HIP 46816 |
57.16 |
| 2026-08-08 00:00 |
09:28:40.79 |
-11:20:54.4 |
HIP 46816 |
56.01 |
| 2026-08-08 12:00 |
09:28:45.80 |
-11:21:16.7 |
HIP 46816 |
54.87 |
| 2026-08-09 00:00 |
09:28:50.81 |
-11:21:39.4 |
HIP 46816 |
53.74 |
| 2026-08-09 12:00 |
09:28:55.83 |
-11:22:02.4 |
HIP 46816 |
52.61 |
| 2026-08-10 00:00 |
09:29:00.84 |
-11:22:25.7 |
HIP 46816 |
51.50 |
| 2026-08-10 12:00 |
09:29:05.85 |
-11:22:49.4 |
HIP 46816 |
50.39 |
| 2026-08-11 00:00 |
09:29:10.87 |
-11:23:13.3 |
HIP 46816 |
49.29 |
| 2026-08-11 12:00 |
09:29:15.88 |
-11:23:37.7 |
HIP 46816 |
48.20 |
| 2026-08-12 00:00 |
09:29:20.89 |
-11:24:02.3 |
HIP 46816 |
47.13 |
| 2026-08-12 12:00 |
09:29:25.91 |
-11:24:27.2 |
HIP 46816 |
46.06 |
| 2026-08-13 00:00 |
09:29:30.92 |
-11:24:52.5 |
HIP 46816 |
45.02 |
| 2026-08-13 12:00 |
09:29:35.93 |
-11:25:18.1 |
HIP 46816 |
43.98 |
| 2026-08-14 00:00 |
09:29:40.94 |
-11:25:43.9 |
HIP 46816 |
42.97 |
| 2026-08-14 12:00 |
09:29:45.94 |
-11:26:10.1 |
HIP 46816 |
41.97 |
| 2026-08-15 00:00 |
09:29:50.94 |
-11:26:36.7 |
HIP 46816 |
41.00 |
| 2026-08-15 12:00 |
09:29:55.94 |
-11:27:03.5 |
HIP 46816 |
40.04 |
| 2026-08-16 00:00 |
09:30:00.94 |
-11:27:30.6 |
HIP 46816 |
39.11 |
| 2026-08-16 12:00 |
09:30:05.93 |
-11:27:58.0 |
HIP 46816 |
38.20 |
| 2026-08-17 00:00 |
09:30:10.92 |
-11:28:25.8 |
HIP 46816 |
37.32 |
| 2026-08-17 12:00 |
09:30:15.91 |
-11:28:53.8 |
HIP 46816 |
36.47 |
| 2026-08-18 00:00 |
09:30:20.88 |
-11:29:22.1 |
HIP 46816 |
35.65 |
| 2026-08-18 12:00 |
09:30:25.86 |
-11:29:50.7 |
HIP 46816 |
34.86 |
| 2026-08-19 00:00 |
09:30:30.83 |
-11:30:19.6 |
HIP 46816 |
34.11 |