メタデータ
| 項目 |
値 |
| Designation |
C/2018 P5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-02-26T05:12:25.888320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
93 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-08-11T10:48:29.376000Z |
| Discovery magnitude (MPC) |
20.90 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) |
2019-02-17.0000000 |
| e |
0.64088887 |
| q (au) |
4.575882 |
| a (au) |
12.742244 |
| i (deg) |
7.256838 |
| Ω (om, deg) |
216.241264 |
| ω (w, deg) |
131.634272 |
| M (ma, deg) |
359.800279 |
等級
散乱 + 全体線形
$$
M_a = (13.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.535 |
| n |
2.000 |
| gf |
0.902 |
| gb |
-0.890 |
| k |
1.000 |
| δ90 |
5.476 |
| 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) |
| 2026-03-26 00:00 |
07:44:51.77 |
+13:43:03.4 |
HIP 37665 |
17.07 |
| 2026-03-26 12:00 |
07:44:50.62 |
+13:43:22.8 |
HIP 37665 |
16.85 |
| 2026-03-27 00:00 |
07:44:49.54 |
+13:43:42.0 |
HIP 37665 |
16.66 |
| 2026-03-27 12:00 |
07:44:48.55 |
+13:44:01.1 |
HIP 37665 |
16.50 |
| 2026-03-28 00:00 |
07:44:47.63 |
+13:44:20.0 |
HIP 37665 |
16.36 |
| 2026-03-28 12:00 |
07:44:46.79 |
+13:44:38.7 |
HIP 37665 |
16.24 |
| 2026-03-29 00:00 |
07:44:46.03 |
+13:44:57.2 |
HIP 37665 |
16.16 |
| 2026-03-29 12:00 |
07:44:45.35 |
+13:45:15.5 |
HIP 37665 |
16.09 |
| 2026-03-30 00:00 |
07:44:44.74 |
+13:45:33.7 |
HIP 37665 |
16.05 |
| 2026-03-30 12:00 |
07:44:44.22 |
+13:45:51.7 |
HIP 37665 |
16.04 |
| 2026-03-31 00:00 |
07:44:43.77 |
+13:46:09.5 |
HIP 37665 |
16.04 |
| 2026-03-31 12:00 |
07:44:43.40 |
+13:46:27.0 |
HIP 37665 |
16.07 |
| 2026-04-01 00:00 |
07:44:43.11 |
+13:46:44.5 |
HIP 37665 |
16.12 |
| 2026-04-01 12:00 |
07:44:42.89 |
+13:47:01.7 |
HIP 37665 |
16.20 |
| 2026-04-02 00:00 |
07:44:42.76 |
+13:47:18.7 |
HIP 37665 |
16.29 |
| 2026-04-02 12:00 |
07:44:42.70 |
+13:47:35.5 |
HIP 37665 |
16.40 |
| 2026-04-03 00:00 |
07:44:42.72 |
+13:47:52.2 |
HIP 37665 |
16.53 |
| 2026-04-03 12:00 |
07:44:42.82 |
+13:48:08.6 |
HIP 37665 |
16.68 |
| 2026-04-04 00:00 |
07:44:42.99 |
+13:48:24.9 |
HIP 37665 |
16.85 |
| 2026-04-04 12:00 |
07:44:43.25 |
+13:48:40.9 |
HIP 37665 |
17.04 |
| 2026-04-05 00:00 |
07:44:43.58 |
+13:48:56.8 |
HIP 37665 |
17.24 |
| 2026-04-05 12:00 |
07:44:43.99 |
+13:49:12.4 |
HIP 37665 |
17.46 |
| 2026-04-06 00:00 |
07:44:44.47 |
+13:49:27.9 |
HIP 37665 |
17.70 |
| 2026-04-06 12:00 |
07:44:45.03 |
+13:49:43.1 |
HIP 37665 |
17.95 |
| 2026-04-07 00:00 |
07:44:45.68 |
+13:49:58.2 |
HIP 37665 |
18.21 |
| 2026-04-07 12:00 |
07:44:46.39 |
+13:50:13.0 |
HIP 37665 |
18.49 |
| 2026-04-08 00:00 |
07:44:47.19 |
+13:50:27.7 |
HIP 37665 |
18.79 |
| 2026-04-08 12:00 |
07:44:48.06 |
+13:50:42.1 |
HIP 37665 |
19.10 |
| 2026-04-09 00:00 |
07:44:49.01 |
+13:50:56.3 |
HIP 37665 |
19.42 |
| 2026-04-09 12:00 |
07:44:50.04 |
+13:51:10.4 |
HIP 37665 |
19.76 |
| 2026-04-10 00:00 |
07:44:51.14 |
+13:51:24.2 |
HIP 37665 |
20.11 |
| 2026-04-10 12:00 |
07:44:52.32 |
+13:51:37.8 |
HIP 37665 |
20.47 |
| 2026-04-11 00:00 |
07:44:53.58 |
+13:51:51.2 |
HIP 37665 |
20.85 |
| 2026-04-11 12:00 |
07:44:54.91 |
+13:52:04.3 |
HIP 37665 |
21.24 |
| 2026-04-12 00:00 |
07:44:56.32 |
+13:52:17.3 |
HIP 37920 |
21.09 |
| 2026-04-12 12:00 |
07:44:57.80 |
+13:52:30.1 |
HIP 37920 |
20.85 |
| 2026-04-13 00:00 |
07:44:59.37 |
+13:52:42.6 |
HIP 37920 |
20.59 |
| 2026-04-13 12:00 |
07:45:01.01 |
+13:52:54.9 |
HIP 37920 |
20.33 |
| 2026-04-14 00:00 |
07:45:02.72 |
+13:53:07.0 |
HIP 37920 |
20.05 |
| 2026-04-14 12:00 |
07:45:04.51 |
+13:53:18.9 |
HIP 37920 |
19.76 |
| 2026-04-15 00:00 |
07:45:06.38 |
+13:53:30.6 |
HIP 37920 |
19.46 |
| 2026-04-15 12:00 |
07:45:08.32 |
+13:53:42.0 |
HIP 37920 |
19.16 |
| 2026-04-16 00:00 |
07:45:10.33 |
+13:53:53.2 |
HIP 37920 |
18.84 |