P/2018 L4 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2018 L4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-07-31T20:14:06.267840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:44Z |
| Obs used |
129 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
21.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-06-08T12:14:11.040000Z |
| Discovery magnitude (MPC) |
21.00 i |
| 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) |
2018-06-29.0000000 |
| e |
0.66033053 |
| q (au) |
1.676234 |
| a (au) |
4.934898 |
| i (deg) |
26.625477 |
| Ω (om, deg) |
145.193041 |
| ω (w, deg) |
140.432575 |
| M (ma, deg) |
357.047219 |
等級
散乱 + 全体線形
$$
M_a = (17.644 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.644 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.692 |
| 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) |
| 2026-02-03 00:00 |
08:23:36.69 |
+08:52:13.5 |
HIP 41183 |
23.66 |
| 2026-02-03 12:00 |
08:23:22.68 |
+08:53:37.1 |
HIP 41183 |
24.02 |
| 2026-02-04 00:00 |
08:23:08.71 |
+08:55:00.9 |
HIP 41183 |
24.94 |
| 2026-02-04 12:00 |
08:22:54.76 |
+08:56:25.0 |
HIP 41183 |
26.34 |
| 2026-02-05 00:00 |
08:22:40.85 |
+08:57:49.4 |
HIP 41183 |
28.16 |
| 2026-02-05 12:00 |
08:22:26.97 |
+08:59:14.0 |
HIP 40911 |
26.90 |
| 2026-02-06 00:00 |
08:22:13.12 |
+09:00:39.0 |
HIP 40911 |
24.99 |
| 2026-02-06 12:00 |
08:21:59.31 |
+09:02:04.1 |
HIP 40911 |
23.52 |
| 2026-02-07 00:00 |
08:21:45.54 |
+09:03:29.6 |
HIP 40911 |
22.58 |
| 2026-02-07 12:00 |
08:21:31.81 |
+09:04:55.2 |
HIP 40911 |
22.23 |
| 2026-02-08 00:00 |
08:21:18.12 |
+09:06:21.2 |
HIP 40879 |
21.39 |
| 2026-02-08 12:00 |
08:21:04.48 |
+09:07:47.3 |
HIP 40879 |
18.41 |
| 2026-02-09 00:00 |
08:20:50.88 |
+09:09:13.6 |
HIP 40879 |
15.72 |
| 2026-02-09 12:00 |
08:20:37.33 |
+09:10:40.2 |
HIP 40879 |
13.49 |
| 2026-02-10 00:00 |
08:20:23.82 |
+09:12:06.9 |
HIP 40879 |
11.97 |
| 2026-02-10 12:00 |
08:20:10.37 |
+09:13:33.9 |
HIP 40879 |
11.43 |
| 2026-02-11 00:00 |
08:19:56.97 |
+09:15:01.0 |
HIP 40879 |
12.01 |
| 2026-02-11 12:00 |
08:19:43.63 |
+09:16:28.3 |
HIP 40879 |
13.54 |
| 2026-02-12 00:00 |
08:19:30.34 |
+09:17:55.8 |
HIP 40879 |
15.74 |
| 2026-02-12 12:00 |
08:19:17.12 |
+09:19:23.4 |
HIP 40691 |
16.86 |
| 2026-02-13 00:00 |
08:19:03.95 |
+09:20:51.1 |
HIP 40691 |
15.51 |
| 2026-02-13 12:00 |
08:18:50.84 |
+09:22:19.0 |
HIP 40691 |
14.91 |
| 2026-02-14 00:00 |
08:18:37.80 |
+09:23:47.1 |
HIP 40691 |
15.15 |
| 2026-02-14 12:00 |
08:18:24.82 |
+09:25:15.2 |
HIP 40691 |
16.18 |
| 2026-02-15 00:00 |
08:18:11.91 |
+09:26:43.5 |
HIP 40691 |
17.85 |
| 2026-02-15 12:00 |
08:17:59.07 |
+09:28:11.8 |
HIP 40628 |
18.86 |
| 2026-02-16 00:00 |
08:17:46.30 |
+09:29:40.3 |
HIP 40628 |
19.83 |
| 2026-02-16 12:00 |
08:17:33.61 |
+09:31:08.8 |
HIP 40512 |
20.45 |
| 2026-02-17 00:00 |
08:17:20.98 |
+09:32:37.5 |
HIP 40512 |
18.16 |
| 2026-02-17 12:00 |
08:17:08.44 |
+09:34:06.1 |
HIP 40512 |
16.31 |
| 2026-02-18 00:00 |
08:16:55.97 |
+09:35:34.9 |
HIP 40512 |
15.02 |
| 2026-02-18 12:00 |
08:16:43.58 |
+09:37:03.7 |
HIP 40512 |
14.46 |
| 2026-02-19 00:00 |
08:16:31.27 |
+09:38:32.5 |
HIP 40512 |
14.69 |
| 2026-02-19 12:00 |
08:16:19.04 |
+09:40:01.4 |
HIP 40512 |
15.66 |
| 2026-02-20 00:00 |
08:16:06.90 |
+09:41:30.2 |
HIP 40512 |
17.24 |
| 2026-02-20 12:00 |
08:15:54.85 |
+09:42:59.1 |
HIP 40449 |
16.75 |
| 2026-02-21 00:00 |
08:15:42.88 |
+09:44:28.0 |
HIP 40449 |
14.51 |
| 2026-02-21 12:00 |
08:15:31.00 |
+09:45:56.9 |
HIP 40449 |
12.74 |
| 2026-02-22 00:00 |
08:15:19.21 |
+09:47:25.8 |
HIP 40449 |
11.64 |
| 2026-02-22 12:00 |
08:15:07.51 |
+09:48:54.6 |
HIP 40449 |
11.39 |
| 2026-02-23 00:00 |
08:14:55.90 |
+09:50:23.5 |
HIP 40449 |
12.02 |
| 2026-02-23 12:00 |
08:14:44.39 |
+09:51:52.2 |
HIP 40449 |
13.40 |
| 2026-02-24 00:00 |
08:14:32.98 |
+09:53:21.0 |
HIP 40449 |
15.31 |