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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
09:20:05.19 |
-11:26:25.1 |
HIP 45744 |
10.74 |
| 2026-06-03 00:00 |
09:20:07.01 |
-11:25:57.2 |
HIP 45744 |
10.75 |
| 2026-06-03 12:00 |
09:20:08.87 |
-11:25:29.6 |
HIP 45744 |
10.81 |
| 2026-06-04 00:00 |
09:20:10.77 |
-11:25:02.4 |
HIP 45744 |
10.92 |
| 2026-06-04 12:00 |
09:20:12.72 |
-11:24:35.6 |
HIP 45744 |
11.08 |
| 2026-06-05 00:00 |
09:20:14.71 |
-11:24:09.2 |
HIP 45744 |
11.29 |
| 2026-06-05 12:00 |
09:20:16.74 |
-11:23:43.1 |
HIP 45744 |
11.55 |
| 2026-06-06 00:00 |
09:20:18.82 |
-11:23:17.4 |
HIP 45744 |
11.85 |
| 2026-06-06 12:00 |
09:20:20.94 |
-11:22:52.0 |
HIP 45744 |
12.19 |
| 2026-06-07 00:00 |
09:20:23.10 |
-11:22:27.1 |
HIP 45744 |
12.56 |
| 2026-06-07 12:00 |
09:20:25.30 |
-11:22:02.5 |
HIP 45744 |
12.98 |
| 2026-06-08 00:00 |
09:20:27.54 |
-11:21:38.3 |
HIP 45744 |
13.43 |
| 2026-06-08 12:00 |
09:20:29.83 |
-11:21:14.4 |
HIP 45744 |
13.90 |
| 2026-06-09 00:00 |
09:20:32.16 |
-11:20:51.0 |
HIP 45744 |
14.41 |
| 2026-06-09 12:00 |
09:20:34.53 |
-11:20:27.9 |
HIP 45744 |
14.94 |
| 2026-06-10 00:00 |
09:20:36.94 |
-11:20:05.2 |
HIP 45744 |
15.49 |
| 2026-06-10 12:00 |
09:20:39.39 |
-11:19:42.9 |
HIP 45744 |
16.07 |
| 2026-06-11 00:00 |
09:20:41.88 |
-11:19:21.0 |
HIP 45744 |
16.66 |
| 2026-06-11 12:00 |
09:20:44.41 |
-11:18:59.4 |
HIP 45744 |
17.28 |
| 2026-06-12 00:00 |
09:20:46.98 |
-11:18:38.3 |
HIP 45744 |
17.91 |
| 2026-06-12 12:00 |
09:20:49.59 |
-11:18:17.5 |
HIP 45744 |
18.56 |
| 2026-06-13 00:00 |
09:20:52.24 |
-11:17:57.2 |
HIP 45744 |
19.22 |
| 2026-06-13 12:00 |
09:20:54.92 |
-11:17:37.2 |
HIP 45744 |
19.90 |
| 2026-06-14 00:00 |
09:20:57.65 |
-11:17:17.6 |
HIP 45744 |
20.59 |
| 2026-06-14 12:00 |
09:21:00.42 |
-11:16:58.4 |
HIP 45744 |
21.29 |
| 2026-06-15 00:00 |
09:21:03.22 |
-11:16:39.6 |
HIP 45744 |
22.01 |
| 2026-06-15 12:00 |
09:21:06.06 |
-11:16:21.1 |
HIP 45744 |
22.73 |
| 2026-06-16 00:00 |
09:21:08.94 |
-11:16:03.1 |
HIP 45744 |
23.47 |
| 2026-06-16 12:00 |
09:21:11.86 |
-11:15:45.5 |
HIP 45744 |
24.21 |
| 2026-06-17 00:00 |
09:21:14.81 |
-11:15:28.3 |
HIP 45744 |
24.97 |
| 2026-06-17 12:00 |
09:21:17.80 |
-11:15:11.4 |
HIP 45744 |
25.73 |
| 2026-06-18 00:00 |
09:21:20.82 |
-11:14:55.0 |
HIP 45744 |
26.51 |
| 2026-06-18 12:00 |
09:21:23.88 |
-11:14:38.9 |
HIP 45744 |
27.29 |
| 2026-06-19 00:00 |
09:21:26.98 |
-11:14:23.3 |
HIP 45744 |
28.08 |
| 2026-06-19 12:00 |
09:21:30.11 |
-11:14:08.0 |
HIP 45744 |
28.88 |
| 2026-06-20 00:00 |
09:21:33.28 |
-11:13:53.1 |
HIP 45744 |
29.69 |
| 2026-06-20 12:00 |
09:21:36.48 |
-11:13:38.7 |
HIP 45744 |
30.50 |
| 2026-06-21 00:00 |
09:21:39.72 |
-11:13:24.6 |
HIP 45744 |
31.33 |
| 2026-06-21 12:00 |
09:21:42.99 |
-11:13:10.9 |
HIP 45744 |
32.16 |
| 2026-06-22 00:00 |
09:21:46.29 |
-11:12:57.6 |
HIP 45744 |
32.99 |