メタデータ
| 項目 |
値 |
| Designation |
P/2018 P4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-11-07T08:17:57.094080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
116 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-08-08T12:01:59.232000Z |
| Discovery magnitude (MPC) |
20.60 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) |
2018-09-13.0000000 |
| e |
0.44931114 |
| q (au) |
3.666142 |
| a (au) |
6.657375 |
| i (deg) |
23.112765 |
| Ω (om, deg) |
353.110347 |
| ω (w, deg) |
8.115551 |
| M (ma, deg) |
356.824339 |
等級
散乱 + 全体線形
$$
M_a = (8.263 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.263 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.852 |
| k |
0.999 |
| 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 |
11:09:00.41 |
+05:59:19.9 |
HIP 54563 |
18.88 |
| 2026-06-01 12:00 |
11:09:01.30 |
+05:58:53.4 |
HIP 54563 |
18.41 |
| 2026-06-02 00:00 |
11:09:02.29 |
+05:58:26.3 |
HIP 54563 |
17.91 |
| 2026-06-02 12:00 |
11:09:03.38 |
+05:57:58.7 |
HIP 54563 |
17.40 |
| 2026-06-03 00:00 |
11:09:04.56 |
+05:57:30.5 |
HIP 54563 |
16.86 |
| 2026-06-03 12:00 |
11:09:05.83 |
+05:57:01.7 |
HIP 54563 |
16.30 |
| 2026-06-04 00:00 |
11:09:07.19 |
+05:56:32.5 |
HIP 54563 |
15.72 |
| 2026-06-04 12:00 |
11:09:08.65 |
+05:56:02.6 |
HIP 54563 |
15.12 |
| 2026-06-05 00:00 |
11:09:10.20 |
+05:55:32.2 |
HIP 54563 |
14.49 |
| 2026-06-05 12:00 |
11:09:11.85 |
+05:55:01.3 |
HIP 54563 |
13.85 |
| 2026-06-06 00:00 |
11:09:13.58 |
+05:54:29.8 |
HIP 54563 |
13.18 |
| 2026-06-06 12:00 |
11:09:15.41 |
+05:53:57.8 |
HIP 54563 |
12.48 |
| 2026-06-07 00:00 |
11:09:17.33 |
+05:53:25.2 |
HIP 54563 |
11.77 |
| 2026-06-07 12:00 |
11:09:19.35 |
+05:52:52.1 |
HIP 54563 |
11.03 |
| 2026-06-08 00:00 |
11:09:21.45 |
+05:52:18.4 |
HIP 54563 |
10.27 |
| 2026-06-08 12:00 |
11:09:23.65 |
+05:51:44.2 |
HIP 54563 |
9.49 |
| 2026-06-09 00:00 |
11:09:25.94 |
+05:51:09.5 |
HIP 54563 |
8.68 |
| 2026-06-09 12:00 |
11:09:28.32 |
+05:50:34.2 |
HIP 54563 |
7.86 |
| 2026-06-10 00:00 |
11:09:30.79 |
+05:49:58.4 |
HIP 54563 |
7.01 |
| 2026-06-10 12:00 |
11:09:33.36 |
+05:49:22.0 |
HIP 54563 |
6.14 |
| 2026-06-11 00:00 |
11:09:36.01 |
+05:48:45.1 |
HIP 54563 |
5.25 |
| 2026-06-11 12:00 |
11:09:38.75 |
+05:48:07.7 |
HIP 54563 |
4.34 |
| 2026-06-12 00:00 |
11:09:41.59 |
+05:47:29.7 |
HIP 54563 |
3.41 |
| 2026-06-12 12:00 |
11:09:44.51 |
+05:46:51.3 |
HIP 54563 |
2.48 |
| 2026-06-13 00:00 |
11:09:47.52 |
+05:46:12.2 |
HIP 54563 |
1.57 |
| 2026-06-13 12:00 |
11:09:50.62 |
+05:45:32.7 |
HIP 54563 |
0.83 |
| 2026-06-14 00:00 |
11:09:53.81 |
+05:44:52.6 |
HIP 54563 |
1.01 |
| 2026-06-14 12:00 |
11:09:57.09 |
+05:44:12.0 |
HIP 54563 |
1.89 |
| 2026-06-15 00:00 |
11:10:00.46 |
+05:43:30.9 |
HIP 54563 |
2.91 |
| 2026-06-15 12:00 |
11:10:03.92 |
+05:42:49.3 |
HIP 54563 |
3.98 |
| 2026-06-16 00:00 |
11:10:07.46 |
+05:42:07.1 |
HIP 54563 |
5.09 |
| 2026-06-16 12:00 |
11:10:11.09 |
+05:41:24.5 |
HIP 54563 |
6.23 |
| 2026-06-17 00:00 |
11:10:14.81 |
+05:40:41.3 |
HIP 54563 |
7.39 |
| 2026-06-17 12:00 |
11:10:18.62 |
+05:39:57.6 |
HIP 54563 |
8.58 |
| 2026-06-18 00:00 |
11:10:22.51 |
+05:39:13.4 |
HIP 54563 |
9.79 |
| 2026-06-18 12:00 |
11:10:26.49 |
+05:38:28.7 |
HIP 54563 |
11.02 |
| 2026-06-19 00:00 |
11:10:30.55 |
+05:37:43.5 |
HIP 54563 |
12.28 |
| 2026-06-19 12:00 |
11:10:34.69 |
+05:36:57.7 |
HIP 54563 |
13.55 |
| 2026-06-20 00:00 |
11:10:38.93 |
+05:36:11.5 |
HIP 54563 |
14.85 |
| 2026-06-20 12:00 |
11:10:43.24 |
+05:35:24.8 |
HIP 54563 |
16.18 |
| 2026-06-21 00:00 |
11:10:47.64 |
+05:34:37.6 |
HIP 54563 |
17.52 |
| 2026-06-21 12:00 |
11:10:52.12 |
+05:33:49.9 |
HIP 54563 |
18.89 |
| 2026-06-22 00:00 |
11:10:56.69 |
+05:33:01.7 |
HIP 54563 |
20.27 |