メタデータ
| 項目 |
値 |
| Designation |
P/2019 LD2 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-09T09:51:48.663360Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:21Z |
| Obs used |
770 |
| 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) |
2020-09-29.0000000 |
| e |
0.13350136 |
| q (au) |
4.577933 |
| a (au) |
5.283255 |
| i (deg) |
11.568661 |
| Ω (om, deg) |
179.662369 |
| ω (w, deg) |
123.425509 |
| M (ma, deg) |
14.007637 |
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 |
0.999 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
07:58:38.00 |
+12:13:36.9 |
HIP 38989 |
6.67 |
| 2026-06-03 00:00 |
07:58:57.64 |
+12:13:19.9 |
HIP 38989 |
6.72 |
| 2026-06-03 12:00 |
07:59:17.34 |
+12:13:02.3 |
HIP 38989 |
9.61 |
| 2026-06-04 00:00 |
07:59:37.13 |
+12:12:44.0 |
HIP 39140 |
10.85 |
| 2026-06-04 12:00 |
07:59:56.98 |
+12:12:25.2 |
HIP 39140 |
6.02 |
| 2026-06-05 00:00 |
08:00:16.90 |
+12:12:05.7 |
HIP 39140 |
1.35 |
| 2026-06-05 12:00 |
08:00:36.90 |
+12:11:45.7 |
HIP 39140 |
3.90 |
| 2026-06-06 00:00 |
08:00:56.96 |
+12:11:25.0 |
HIP 39140 |
8.77 |
| 2026-06-06 12:00 |
08:01:17.10 |
+12:11:03.8 |
HIP 39140 |
13.69 |
| 2026-06-07 00:00 |
08:01:37.30 |
+12:10:41.9 |
HIP 39140 |
18.63 |
| 2026-06-07 12:00 |
08:01:57.58 |
+12:10:19.5 |
HIP 39343 |
18.88 |
| 2026-06-08 00:00 |
08:02:17.92 |
+12:09:56.4 |
HIP 39418 |
17.35 |
| 2026-06-08 12:00 |
08:02:38.32 |
+12:09:32.8 |
HIP 39418 |
12.41 |
| 2026-06-09 00:00 |
08:02:58.79 |
+12:09:08.5 |
HIP 39418 |
7.54 |
| 2026-06-09 12:00 |
08:03:19.33 |
+12:08:43.7 |
HIP 39418 |
3.17 |
| 2026-06-10 00:00 |
08:03:39.93 |
+12:08:18.2 |
HIP 39418 |
3.75 |
| 2026-06-10 12:00 |
08:04:00.60 |
+12:07:52.2 |
HIP 39418 |
8.33 |
| 2026-06-11 00:00 |
08:04:21.33 |
+12:07:25.6 |
HIP 39550 |
8.65 |
| 2026-06-11 12:00 |
08:04:42.12 |
+12:06:58.3 |
HIP 39550 |
4.75 |
| 2026-06-12 00:00 |
08:05:02.98 |
+12:06:30.5 |
HIP 39550 |
4.74 |
| 2026-06-12 12:00 |
08:05:23.89 |
+12:06:02.1 |
HIP 39550 |
8.67 |
| 2026-06-13 00:00 |
08:05:44.87 |
+12:05:33.0 |
HIP 39550 |
13.45 |
| 2026-06-13 12:00 |
08:06:05.90 |
+12:05:03.4 |
HIP 39550 |
18.45 |
| 2026-06-14 00:00 |
08:06:27.00 |
+12:04:33.2 |
HIP 39740 |
15.15 |
| 2026-06-14 12:00 |
08:06:48.15 |
+12:04:02.4 |
HIP 39740 |
11.48 |
| 2026-06-15 00:00 |
08:07:09.36 |
+12:03:31.0 |
HIP 39740 |
9.40 |
| 2026-06-15 12:00 |
08:07:30.63 |
+12:02:59.0 |
HIP 39740 |
9.97 |
| 2026-06-16 00:00 |
08:07:51.95 |
+12:02:26.5 |
HIP 39740 |
12.86 |
| 2026-06-16 12:00 |
08:08:13.32 |
+12:01:53.3 |
HIP 39740 |
16.94 |
| 2026-06-17 00:00 |
08:08:34.76 |
+12:01:19.6 |
HIP 39740 |
21.55 |
| 2026-06-17 12:00 |
08:08:56.24 |
+12:00:45.3 |
HIP 39740 |
26.42 |
| 2026-06-18 00:00 |
08:09:17.78 |
+12:00:10.4 |
HIP 39783 |
29.66 |
| 2026-06-18 12:00 |
08:09:39.36 |
+11:59:34.9 |
HIP 39783 |
33.42 |
| 2026-06-19 00:00 |
08:10:01.00 |
+11:58:58.9 |
HIP 39783 |
37.56 |
| 2026-06-19 12:00 |
08:10:22.69 |
+11:58:22.3 |
HIP 39783 |
41.99 |
| 2026-06-20 00:00 |
08:10:44.43 |
+11:57:45.1 |
HIP 39978 |
45.49 |
| 2026-06-20 12:00 |
08:11:06.21 |
+11:57:07.3 |
HIP 40123 |
47.07 |
| 2026-06-21 00:00 |
08:11:28.05 |
+11:56:29.0 |
HIP 40331 |
43.17 |
| 2026-06-21 12:00 |
08:11:49.93 |
+11:55:50.1 |
HIP 40331 |
38.82 |
| 2026-06-22 00:00 |
08:12:11.85 |
+11:55:10.6 |
HIP 40331 |
34.76 |