メタデータ
| 項目 |
値 |
| Designation |
P/2019 A1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-11T01:01:39.613440Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:01Z |
| Obs used |
63 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-03T15:02:41.568000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-01-18.0000000 |
| e |
0.56892834 |
| q (au) |
2.211667 |
| a (au) |
5.130625 |
| i (deg) |
13.743622 |
| Ω (om, deg) |
312.299496 |
| ω (w, deg) |
150.846750 |
| M (ma, deg) |
8.392589 |
等級
散乱 + 全体線形
$$
M_a = (19.446 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.446 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.718 |
| k |
0.800 |
| 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 |
20:54:22.88 |
-19:53:52.2 |
HIP 103018 |
33.50 |
| 2026-05-12 12:00 |
20:54:24.18 |
-19:53:42.0 |
HIP 103018 |
33.70 |
| 2026-05-13 00:00 |
20:54:25.33 |
-19:53:32.4 |
HIP 103018 |
33.87 |
| 2026-05-13 12:00 |
20:54:26.35 |
-19:53:23.2 |
HIP 103018 |
34.02 |
| 2026-05-14 00:00 |
20:54:27.23 |
-19:53:14.6 |
HIP 103018 |
34.15 |
| 2026-05-14 12:00 |
20:54:27.97 |
-19:53:06.5 |
HIP 103018 |
34.25 |
| 2026-05-15 00:00 |
20:54:28.58 |
-19:52:59.0 |
HIP 103018 |
34.32 |
| 2026-05-15 12:00 |
20:54:29.05 |
-19:52:51.9 |
HIP 103018 |
34.37 |
| 2026-05-16 00:00 |
20:54:29.38 |
-19:52:45.4 |
HIP 103018 |
34.40 |
| 2026-05-16 12:00 |
20:54:29.57 |
-19:52:39.4 |
HIP 103018 |
34.40 |
| 2026-05-17 00:00 |
20:54:29.62 |
-19:52:34.0 |
HIP 103018 |
34.37 |
| 2026-05-17 12:00 |
20:54:29.53 |
-19:52:29.0 |
HIP 103018 |
34.32 |
| 2026-05-18 00:00 |
20:54:29.31 |
-19:52:24.6 |
HIP 103018 |
34.24 |
| 2026-05-18 12:00 |
20:54:28.94 |
-19:52:20.7 |
HIP 103018 |
34.14 |
| 2026-05-19 00:00 |
20:54:28.44 |
-19:52:17.4 |
HIP 103018 |
34.01 |
| 2026-05-19 12:00 |
20:54:27.79 |
-19:52:14.5 |
HIP 103018 |
33.85 |
| 2026-05-20 00:00 |
20:54:27.01 |
-19:52:12.2 |
HIP 103018 |
33.67 |
| 2026-05-20 12:00 |
20:54:26.09 |
-19:52:10.4 |
HIP 103018 |
33.46 |
| 2026-05-21 00:00 |
20:54:25.03 |
-19:52:09.1 |
HIP 103018 |
33.22 |
| 2026-05-21 12:00 |
20:54:23.83 |
-19:52:08.3 |
HIP 103018 |
32.96 |
| 2026-05-22 00:00 |
20:54:22.49 |
-19:52:08.1 |
HIP 103018 |
32.67 |
| 2026-05-22 12:00 |
20:54:21.01 |
-19:52:08.3 |
HIP 103018 |
32.35 |
| 2026-05-23 00:00 |
20:54:19.39 |
-19:52:09.1 |
HIP 103018 |
32.01 |
| 2026-05-23 12:00 |
20:54:17.63 |
-19:52:10.4 |
HIP 103018 |
31.65 |
| 2026-05-24 00:00 |
20:54:15.74 |
-19:52:12.2 |
HIP 103018 |
31.26 |
| 2026-05-24 12:00 |
20:54:13.70 |
-19:52:14.5 |
HIP 103018 |
30.84 |
| 2026-05-25 00:00 |
20:54:11.53 |
-19:52:17.3 |
HIP 103018 |
30.41 |
| 2026-05-25 12:00 |
20:54:09.21 |
-19:52:20.6 |
HIP 103018 |
29.95 |
| 2026-05-26 00:00 |
20:54:06.76 |
-19:52:24.4 |
HIP 103018 |
29.47 |
| 2026-05-26 12:00 |
20:54:04.17 |
-19:52:28.8 |
HIP 103018 |
28.96 |
| 2026-05-27 00:00 |
20:54:01.44 |
-19:52:33.6 |
HIP 103018 |
28.44 |
| 2026-05-27 12:00 |
20:53:58.57 |
-19:52:38.9 |
HIP 103018 |
27.90 |
| 2026-05-28 00:00 |
20:53:55.56 |
-19:52:44.8 |
HIP 103018 |
27.34 |
| 2026-05-28 12:00 |
20:53:52.42 |
-19:52:51.1 |
HIP 103018 |
26.76 |
| 2026-05-29 00:00 |
20:53:49.13 |
-19:52:57.9 |
HIP 103018 |
26.18 |
| 2026-05-29 12:00 |
20:53:45.71 |
-19:53:05.2 |
HIP 103018 |
25.57 |
| 2026-05-30 00:00 |
20:53:42.15 |
-19:53:13.0 |
HIP 103018 |
24.96 |
| 2026-05-30 12:00 |
20:53:38.45 |
-19:53:21.4 |
HIP 103018 |
24.35 |
| 2026-05-31 00:00 |
20:53:34.61 |
-19:53:30.1 |
HIP 103018 |
23.73 |
| 2026-05-31 12:00 |
20:53:30.64 |
-19:53:39.4 |
HIP 103018 |
23.11 |
| 2026-06-01 00:00 |
20:53:26.53 |
-19:53:49.2 |
HIP 103018 |
22.49 |
| 2026-06-01 12:00 |
20:53:22.28 |
-19:53:59.4 |
HIP 103018 |
21.88 |
| 2026-06-02 00:00 |
20:53:17.89 |
-19:54:10.2 |
HIP 103018 |
21.29 |