メタデータ
| 項目 |
値 |
| Designation |
P/2019 U4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-09-18T08:38:38.333760Z |
| Orbit solution date (soln_date, UTC) |
2021-11-09T14:03:17Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
18.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-10-25T12:45:41.212800Z |
| Discovery magnitude (MPC) |
21.11 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) |
2019-10-19.0000000 |
| e |
0.47518301 |
| q (au) |
1.847129 |
| a (au) |
3.519568 |
| i (deg) |
11.692289 |
| Ω (om, deg) |
200.040609 |
| ω (w, deg) |
180.960217 |
| M (ma, deg) |
4.573581 |
等級
散乱 + 全体線形
$$
M_a = (19.329 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.329 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.681 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
00:16:12.61 |
+03:52:22.8 |
HIP 1272 |
23.01 |
| 2026-03-26 12:00 |
00:17:26.47 |
+03:58:22.3 |
HIP 1455 |
14.78 |
| 2026-03-27 00:00 |
00:18:40.36 |
+04:04:21.7 |
HIP 1455 |
18.43 |
| 2026-03-27 12:00 |
00:19:54.29 |
+04:10:20.9 |
HIP 1455 |
34.82 |
| 2026-03-28 00:00 |
00:21:08.26 |
+04:16:19.9 |
HIP 1628 |
32.55 |
| 2026-03-28 12:00 |
00:22:22.27 |
+04:22:18.7 |
HIP 1628 |
38.73 |
| 2026-03-29 00:00 |
00:23:36.32 |
+04:28:17.3 |
HIP 1894 |
42.94 |
| 2026-03-29 12:00 |
00:24:50.41 |
+04:34:15.6 |
HIP 2046 |
42.11 |
| 2026-03-30 00:00 |
00:26:04.53 |
+04:40:13.7 |
HIP 2195 |
24.94 |
| 2026-03-30 12:00 |
00:27:18.69 |
+04:46:11.5 |
HIP 2195 |
11.55 |
| 2026-03-31 00:00 |
00:28:32.89 |
+04:52:09.0 |
HIP 2195 |
19.97 |
| 2026-03-31 12:00 |
00:29:47.13 |
+04:58:06.2 |
HIP 2358 |
8.43 |
| 2026-04-01 00:00 |
00:31:01.41 |
+05:04:03.1 |
HIP 2510 |
17.92 |
| 2026-04-01 12:00 |
00:32:15.73 |
+05:09:59.7 |
HIP 2510 |
20.28 |
| 2026-04-02 00:00 |
00:33:30.08 |
+05:15:55.9 |
HIP 2659 |
19.25 |
| 2026-04-02 12:00 |
00:34:44.48 |
+05:21:51.7 |
HIP 2659 |
29.58 |
| 2026-04-03 00:00 |
00:35:58.91 |
+05:27:47.1 |
HIP 2918 |
14.79 |
| 2026-04-03 12:00 |
00:37:13.38 |
+05:33:42.2 |
HIP 2918 |
9.83 |
| 2026-04-04 00:00 |
00:38:27.90 |
+05:39:36.8 |
HIP 2991 |
13.05 |
| 2026-04-04 12:00 |
00:39:42.45 |
+05:45:31.0 |
HIP 3033 |
23.15 |
| 2026-04-05 00:00 |
00:40:57.04 |
+05:51:24.8 |
HIP 3270 |
20.12 |
| 2026-04-05 12:00 |
00:42:11.66 |
+05:57:18.0 |
HIP 3338 |
17.58 |
| 2026-04-06 00:00 |
00:43:26.33 |
+06:03:10.8 |
HIP 3460 |
15.74 |
| 2026-04-06 12:00 |
00:44:41.04 |
+06:09:03.1 |
HIP 3460 |
16.64 |
| 2026-04-07 00:00 |
00:45:55.79 |
+06:14:54.9 |
HIP 3724 |
30.87 |
| 2026-04-07 12:00 |
00:47:10.57 |
+06:20:46.1 |
HIP 3724 |
21.07 |
| 2026-04-08 00:00 |
00:48:25.39 |
+06:26:36.8 |
HIP 3869 |
18.64 |
| 2026-04-08 12:00 |
00:49:40.26 |
+06:32:26.9 |
HIP 3869 |
8.02 |
| 2026-04-09 00:00 |
00:50:55.16 |
+06:38:16.5 |
HIP 3972 |
15.86 |
| 2026-04-09 12:00 |
00:52:10.10 |
+06:44:05.4 |
HIP 4067 |
4.10 |
| 2026-04-10 00:00 |
00:53:25.08 |
+06:49:53.7 |
HIP 4067 |
18.88 |
| 2026-04-10 12:00 |
00:54:40.09 |
+06:55:41.4 |
HIP 4323 |
10.75 |
| 2026-04-11 00:00 |
00:55:55.15 |
+07:01:28.4 |
HIP 4323 |
13.51 |
| 2026-04-11 12:00 |
00:57:10.24 |
+07:07:14.8 |
HIP 4445 |
17.92 |
| 2026-04-12 00:00 |
00:58:25.37 |
+07:13:00.4 |
HIP 4559 |
22.40 |
| 2026-04-12 12:00 |
00:59:40.54 |
+07:18:45.4 |
HIP 4708 |
12.62 |
| 2026-04-13 00:00 |
01:00:55.75 |
+07:24:29.6 |
HIP 4708 |
7.07 |
| 2026-04-13 12:00 |
01:02:10.99 |
+07:30:13.1 |
HIP 4891 |
9.51 |
| 2026-04-14 00:00 |
01:03:26.27 |
+07:35:55.8 |
HIP 4891 |
10.88 |
| 2026-04-14 12:00 |
01:04:41.59 |
+07:41:37.8 |
HIP 5089 |
13.17 |
| 2026-04-15 00:00 |
01:05:56.94 |
+07:47:18.9 |
HIP 5089 |
12.32 |
| 2026-04-15 12:00 |
01:07:12.33 |
+07:52:59.3 |
HIP 5089 |
29.86 |
| 2026-04-16 00:00 |
01:08:27.75 |
+07:58:38.8 |
HIP 5406 |
21.93 |