メタデータ
| 項目 |
値 |
| Designation |
P/2019 LD2 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-09T11:54:35.395200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:03Z |
| Obs used |
768 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-09-23.0000000 |
| e |
0.13358576 |
| q (au) |
4.577943 |
| a (au) |
5.283781 |
| i (deg) |
11.567837 |
| Ω (om, deg) |
179.665632 |
| ω (w, deg) |
123.430769 |
| M (ma, deg) |
13.511728 |
等級
散乱 + 全体線形
$$
M_a = (4.119 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.119 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
07:45:54.34 |
+12:16:07.5 |
HIP 37969 |
15.86 |
| 2026-05-12 12:00 |
07:46:10.05 |
+12:16:17.0 |
HIP 37969 |
12.11 |
| 2026-05-13 00:00 |
07:46:25.87 |
+12:16:26.0 |
HIP 37969 |
8.42 |
| 2026-05-13 12:00 |
07:46:41.80 |
+12:16:34.3 |
HIP 37969 |
5.00 |
| 2026-05-14 00:00 |
07:46:57.84 |
+12:16:42.0 |
HIP 37969 |
3.06 |
| 2026-05-14 12:00 |
07:47:13.98 |
+12:16:49.1 |
HIP 37969 |
4.98 |
| 2026-05-15 00:00 |
07:47:30.23 |
+12:16:55.6 |
HIP 37969 |
8.48 |
| 2026-05-15 12:00 |
07:47:46.59 |
+12:17:01.4 |
HIP 37969 |
12.29 |
| 2026-05-16 00:00 |
07:48:03.05 |
+12:17:06.6 |
HIP 37969 |
16.22 |
| 2026-05-16 12:00 |
07:48:19.61 |
+12:17:11.2 |
HIP 37969 |
20.21 |
| 2026-05-17 00:00 |
07:48:36.28 |
+12:17:15.1 |
HIP 38207 |
17.69 |
| 2026-05-17 12:00 |
07:48:53.05 |
+12:17:18.5 |
HIP 38207 |
14.24 |
| 2026-05-18 00:00 |
07:49:09.92 |
+12:17:21.2 |
HIP 38207 |
11.21 |
| 2026-05-18 12:00 |
07:49:26.89 |
+12:17:23.2 |
HIP 38207 |
9.06 |
| 2026-05-19 00:00 |
07:49:43.96 |
+12:17:24.7 |
HIP 38207 |
8.53 |
| 2026-05-19 12:00 |
07:50:01.12 |
+12:17:25.5 |
HIP 38207 |
9.92 |
| 2026-05-20 00:00 |
07:50:18.39 |
+12:17:25.7 |
HIP 38207 |
12.62 |
| 2026-05-20 12:00 |
07:50:35.75 |
+12:17:25.2 |
HIP 38207 |
16.01 |
| 2026-05-21 00:00 |
07:50:53.20 |
+12:17:24.2 |
HIP 38207 |
19.75 |
| 2026-05-21 12:00 |
07:51:10.75 |
+12:17:22.5 |
HIP 38207 |
23.69 |
| 2026-05-22 00:00 |
07:51:28.40 |
+12:17:20.2 |
HIP 38444 |
22.45 |
| 2026-05-22 12:00 |
07:51:46.13 |
+12:17:17.2 |
HIP 38444 |
19.58 |
| 2026-05-23 00:00 |
07:52:03.96 |
+12:17:13.7 |
HIP 38444 |
17.31 |
| 2026-05-23 12:00 |
07:52:21.88 |
+12:17:09.5 |
HIP 38444 |
15.93 |
| 2026-05-24 00:00 |
07:52:39.89 |
+12:17:04.7 |
HIP 38468 |
15.02 |
| 2026-05-24 12:00 |
07:52:57.98 |
+12:16:59.3 |
HIP 38468 |
15.13 |
| 2026-05-25 00:00 |
07:53:16.17 |
+12:16:53.3 |
HIP 38468 |
16.47 |
| 2026-05-25 12:00 |
07:53:34.44 |
+12:16:46.6 |
HIP 38468 |
18.80 |
| 2026-05-26 00:00 |
07:53:52.80 |
+12:16:39.4 |
HIP 38468 |
21.82 |
| 2026-05-26 12:00 |
07:54:11.24 |
+12:16:31.5 |
HIP 38669 |
21.56 |
| 2026-05-27 00:00 |
07:54:29.77 |
+12:16:23.0 |
HIP 38669 |
19.45 |
| 2026-05-27 12:00 |
07:54:48.38 |
+12:16:13.9 |
HIP 38669 |
18.24 |
| 2026-05-28 00:00 |
07:55:07.08 |
+12:16:04.2 |
HIP 38669 |
18.14 |
| 2026-05-28 12:00 |
07:55:25.86 |
+12:15:53.8 |
HIP 38669 |
19.18 |
| 2026-05-29 00:00 |
07:55:44.72 |
+12:15:42.9 |
HIP 38669 |
21.20 |
| 2026-05-29 12:00 |
07:56:03.66 |
+12:15:31.3 |
HIP 38767 |
23.72 |
| 2026-05-30 00:00 |
07:56:22.68 |
+12:15:19.1 |
HIP 38767 |
24.08 |
| 2026-05-30 12:00 |
07:56:41.78 |
+12:15:06.4 |
HIP 38767 |
25.33 |
| 2026-05-31 00:00 |
07:57:00.96 |
+12:14:53.0 |
HIP 38989 |
26.78 |
| 2026-05-31 12:00 |
07:57:20.21 |
+12:14:39.0 |
HIP 38989 |
22.23 |
| 2026-06-01 00:00 |
07:57:39.55 |
+12:14:24.4 |
HIP 38989 |
17.75 |
| 2026-06-01 12:00 |
07:57:58.96 |
+12:14:09.2 |
HIP 38989 |
13.41 |
| 2026-06-02 00:00 |
07:58:18.44 |
+12:13:53.4 |
HIP 38989 |
9.46 |