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) |
| 2026-05-12 00:00 |
07:48:32.24 |
+13:58:16.4 |
HIP 38208 |
17.92 |
| 2026-05-12 12:00 |
07:48:37.84 |
+13:58:15.1 |
HIP 38208 |
16.67 |
| 2026-05-13 00:00 |
07:48:43.50 |
+13:58:13.6 |
HIP 38208 |
15.41 |
| 2026-05-13 12:00 |
07:48:49.22 |
+13:58:11.9 |
HIP 38208 |
14.16 |
| 2026-05-14 00:00 |
07:48:54.99 |
+13:58:09.9 |
HIP 38208 |
12.92 |
| 2026-05-14 12:00 |
07:49:00.83 |
+13:58:07.7 |
HIP 38208 |
11.71 |
| 2026-05-15 00:00 |
07:49:06.72 |
+13:58:05.2 |
HIP 38208 |
10.53 |
| 2026-05-15 12:00 |
07:49:12.67 |
+13:58:02.5 |
HIP 38208 |
9.42 |
| 2026-05-16 00:00 |
07:49:18.68 |
+13:57:59.5 |
HIP 38208 |
8.39 |
| 2026-05-16 12:00 |
07:49:24.75 |
+13:57:56.3 |
HIP 38208 |
7.49 |
| 2026-05-17 00:00 |
07:49:30.87 |
+13:57:52.8 |
HIP 38208 |
6.79 |
| 2026-05-17 12:00 |
07:49:37.04 |
+13:57:49.1 |
HIP 38208 |
6.36 |
| 2026-05-18 00:00 |
07:49:43.27 |
+13:57:45.2 |
HIP 38208 |
6.27 |
| 2026-05-18 12:00 |
07:49:49.56 |
+13:57:41.0 |
HIP 38208 |
6.53 |
| 2026-05-19 00:00 |
07:49:55.90 |
+13:57:36.6 |
HIP 38208 |
7.13 |
| 2026-05-19 12:00 |
07:50:02.30 |
+13:57:31.9 |
HIP 38208 |
7.98 |
| 2026-05-20 00:00 |
07:50:08.74 |
+13:57:27.0 |
HIP 38208 |
9.04 |
| 2026-05-20 12:00 |
07:50:15.24 |
+13:57:21.8 |
HIP 38208 |
10.23 |
| 2026-05-21 00:00 |
07:50:21.80 |
+13:57:16.4 |
HIP 38208 |
11.52 |
| 2026-05-21 12:00 |
07:50:28.40 |
+13:57:10.8 |
HIP 38208 |
12.90 |
| 2026-05-22 00:00 |
07:50:35.06 |
+13:57:04.9 |
HIP 38208 |
14.33 |
| 2026-05-22 12:00 |
07:50:41.77 |
+13:56:58.7 |
HIP 38208 |
15.80 |
| 2026-05-23 00:00 |
07:50:48.53 |
+13:56:52.4 |
HIP 38360 |
15.91 |
| 2026-05-23 12:00 |
07:50:55.34 |
+13:56:45.7 |
HIP 38360 |
15.18 |
| 2026-05-24 00:00 |
07:51:02.20 |
+13:56:38.9 |
HIP 38360 |
14.59 |
| 2026-05-24 12:00 |
07:51:09.10 |
+13:56:31.8 |
HIP 38360 |
14.18 |
| 2026-05-25 00:00 |
07:51:16.06 |
+13:56:24.5 |
HIP 38360 |
13.96 |
| 2026-05-25 12:00 |
07:51:23.07 |
+13:56:16.9 |
HIP 38360 |
13.95 |
| 2026-05-26 00:00 |
07:51:30.12 |
+13:56:09.1 |
HIP 38360 |
14.15 |
| 2026-05-26 12:00 |
07:51:37.22 |
+13:56:01.0 |
HIP 38360 |
14.56 |
| 2026-05-27 00:00 |
07:51:44.37 |
+13:55:52.7 |
HIP 38360 |
15.16 |
| 2026-05-27 12:00 |
07:51:51.57 |
+13:55:44.2 |
HIP 38360 |
15.94 |
| 2026-05-28 00:00 |
07:51:58.81 |
+13:55:35.4 |
HIP 38360 |
16.88 |
| 2026-05-28 12:00 |
07:52:06.10 |
+13:55:26.4 |
HIP 38360 |
17.94 |
| 2026-05-29 00:00 |
07:52:13.43 |
+13:55:17.2 |
HIP 38360 |
19.13 |
| 2026-05-29 12:00 |
07:52:20.81 |
+13:55:07.7 |
HIP 38360 |
20.41 |
| 2026-05-30 00:00 |
07:52:28.23 |
+13:54:58.0 |
HIP 38360 |
21.78 |
| 2026-05-30 12:00 |
07:52:35.70 |
+13:54:48.1 |
HIP 38360 |
23.21 |
| 2026-05-31 00:00 |
07:52:43.21 |
+13:54:37.9 |
HIP 38360 |
24.71 |
| 2026-05-31 12:00 |
07:52:50.77 |
+13:54:27.5 |
HIP 38360 |
26.26 |
| 2026-06-01 00:00 |
07:52:58.37 |
+13:54:16.8 |
HIP 38597 |
26.24 |
| 2026-06-01 12:00 |
07:53:06.01 |
+13:54:06.0 |
HIP 38597 |
24.88 |
| 2026-06-02 00:00 |
07:53:13.69 |
+13:53:54.8 |
HIP 38597 |
23.59 |