メタデータ
| 項目 |
値 |
| Designation |
P/2019 A6 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-29T07:25:19.718400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:50Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
17.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-07T12:20:51.936000Z |
| Discovery magnitude (MPC) |
20.70 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) |
2019-01-05.0000000 |
| e |
0.63917742 |
| q (au) |
1.938506 |
| a (au) |
5.372463 |
| i (deg) |
33.228328 |
| Ω (om, deg) |
280.271890 |
| ω (w, deg) |
156.305004 |
| M (ma, deg) |
10.185707 |
等級
散乱 + 全体線形
$$
M_a = (18.765 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.765 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.558 |
| 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) |
| 2026-06-01 00:00 |
18:19:05.81 |
-29:50:20.0 |
HIP 89716 |
14.65 |
| 2026-06-01 12:00 |
18:18:52.66 |
-29:50:09.2 |
HIP 89716 |
13.72 |
| 2026-06-02 00:00 |
18:18:39.43 |
-29:49:58.1 |
HIP 89716 |
13.34 |
| 2026-06-02 12:00 |
18:18:26.13 |
-29:49:46.7 |
HIP 89716 |
13.58 |
| 2026-06-03 00:00 |
18:18:12.76 |
-29:49:35.0 |
HIP 89628 |
14.20 |
| 2026-06-03 12:00 |
18:17:59.32 |
-29:49:23.1 |
HIP 89628 |
12.59 |
| 2026-06-04 00:00 |
18:17:45.81 |
-29:49:10.9 |
HIP 89628 |
11.51 |
| 2026-06-04 12:00 |
18:17:32.23 |
-29:48:58.4 |
HIP 89628 |
11.12 |
| 2026-06-05 00:00 |
18:17:18.59 |
-29:48:45.6 |
HIP 89628 |
11.51 |
| 2026-06-05 12:00 |
18:17:04.88 |
-29:48:32.5 |
HIP 89628 |
12.62 |
| 2026-06-06 00:00 |
18:16:51.11 |
-29:48:19.1 |
HIP 89628 |
14.28 |
| 2026-06-06 12:00 |
18:16:37.27 |
-29:48:05.4 |
HIP 89628 |
16.34 |
| 2026-06-07 00:00 |
18:16:23.38 |
-29:47:51.5 |
HIP 89429 |
17.05 |
| 2026-06-07 12:00 |
18:16:09.42 |
-29:47:37.2 |
HIP 89429 |
14.06 |
| 2026-06-08 00:00 |
18:15:55.41 |
-29:47:22.7 |
HIP 89429 |
11.09 |
| 2026-06-08 12:00 |
18:15:41.34 |
-29:47:07.8 |
HIP 89429 |
8.18 |
| 2026-06-09 00:00 |
18:15:27.22 |
-29:46:52.6 |
HIP 89429 |
5.41 |
| 2026-06-09 12:00 |
18:15:13.05 |
-29:46:37.2 |
HIP 89429 |
3.25 |
| 2026-06-10 00:00 |
18:14:58.82 |
-29:46:21.4 |
HIP 89429 |
3.31 |
| 2026-06-10 12:00 |
18:14:44.55 |
-29:46:05.3 |
HIP 89429 |
5.54 |
| 2026-06-11 00:00 |
18:14:30.22 |
-29:45:48.9 |
HIP 89429 |
8.36 |
| 2026-06-11 12:00 |
18:14:15.86 |
-29:45:32.2 |
HIP 89429 |
11.36 |
| 2026-06-12 00:00 |
18:14:01.44 |
-29:45:15.2 |
HIP 89429 |
14.42 |
| 2026-06-12 12:00 |
18:13:46.99 |
-29:44:57.8 |
HIP 89429 |
17.52 |
| 2026-06-13 00:00 |
18:13:32.49 |
-29:44:40.2 |
HIP 89429 |
20.64 |
| 2026-06-13 12:00 |
18:13:17.96 |
-29:44:22.2 |
HIP 89220 |
19.87 |
| 2026-06-14 00:00 |
18:13:03.38 |
-29:44:03.9 |
HIP 89220 |
18.56 |
| 2026-06-14 12:00 |
18:12:48.77 |
-29:43:45.3 |
HIP 89220 |
17.74 |
| 2026-06-15 00:00 |
18:12:34.13 |
-29:43:26.4 |
HIP 89163 |
16.22 |
| 2026-06-15 12:00 |
18:12:19.46 |
-29:43:07.1 |
HIP 89116 |
14.61 |
| 2026-06-16 00:00 |
18:12:04.75 |
-29:42:47.5 |
HIP 89116 |
11.51 |
| 2026-06-16 12:00 |
18:11:50.02 |
-29:42:27.6 |
HIP 89116 |
8.48 |
| 2026-06-17 00:00 |
18:11:35.26 |
-29:42:07.4 |
HIP 89116 |
5.64 |
| 2026-06-17 12:00 |
18:11:20.48 |
-29:41:46.8 |
HIP 89116 |
3.55 |
| 2026-06-18 00:00 |
18:11:05.67 |
-29:41:26.0 |
HIP 89116 |
3.77 |
| 2026-06-18 12:00 |
18:10:50.85 |
-29:41:04.8 |
HIP 89116 |
6.07 |
| 2026-06-19 00:00 |
18:10:36.00 |
-29:40:43.2 |
HIP 89116 |
8.97 |
| 2026-06-19 12:00 |
18:10:21.14 |
-29:40:21.4 |
HIP 89116 |
12.05 |
| 2026-06-20 00:00 |
18:10:06.26 |
-29:39:59.2 |
HIP 89116 |
15.20 |
| 2026-06-20 12:00 |
18:09:51.37 |
-29:39:36.6 |
HIP 89116 |
18.39 |
| 2026-06-21 00:00 |
18:09:36.47 |
-29:39:13.8 |
HIP 89116 |
21.61 |
| 2026-06-21 12:00 |
18:09:21.56 |
-29:38:50.6 |
HIP 88907 |
21.55 |
| 2026-06-22 00:00 |
18:09:06.64 |
-29:38:27.1 |
HIP 88907 |
21.29 |