メタデータ
| 項目 |
値 |
| Designation |
P/2019 S2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-02-20T19:57:11.050560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:59Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-09-28T08:58:56.064000Z |
| Discovery magnitude (MPC) |
21.60 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) |
2019-09-12.0000000 |
| e |
0.20666395 |
| q (au) |
3.755253 |
| a (au) |
4.733496 |
| i (deg) |
10.472992 |
| Ω (om, deg) |
93.123709 |
| ω (w, deg) |
216.744948 |
| M (ma, deg) |
19.444094 |
等級
散乱 + 全体線形
$$
M_a = (16.472 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.472 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.854 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
12:10:09.93 |
+09:10:45.6 |
HIP 59286 |
9.63 |
| 2026-07-29 12:00 |
12:10:28.26 |
+09:08:03.3 |
HIP 59286 |
14.81 |
| 2026-07-30 00:00 |
12:10:46.69 |
+09:05:20.6 |
HIP 59286 |
20.06 |
| 2026-07-30 12:00 |
12:11:05.21 |
+09:02:37.6 |
HIP 59390 |
19.60 |
| 2026-07-31 00:00 |
12:11:23.82 |
+08:59:54.3 |
HIP 59390 |
17.73 |
| 2026-07-31 12:00 |
12:11:42.53 |
+08:57:10.6 |
HIP 59390 |
17.38 |
| 2026-08-01 00:00 |
12:12:01.32 |
+08:54:26.6 |
HIP 59390 |
18.65 |
| 2026-08-01 12:00 |
12:12:20.21 |
+08:51:42.3 |
HIP 59390 |
21.27 |
| 2026-08-02 00:00 |
12:12:39.20 |
+08:48:57.7 |
HIP 59636 |
19.90 |
| 2026-08-02 12:00 |
12:12:58.27 |
+08:46:12.7 |
HIP 59636 |
17.66 |
| 2026-08-03 00:00 |
12:13:17.43 |
+08:43:27.4 |
HIP 59636 |
16.95 |
| 2026-08-03 12:00 |
12:13:36.68 |
+08:40:41.9 |
HIP 59687 |
13.75 |
| 2026-08-04 00:00 |
12:13:56.02 |
+08:37:56.0 |
HIP 59687 |
11.79 |
| 2026-08-04 12:00 |
12:14:15.45 |
+08:35:09.8 |
HIP 59690 |
12.16 |
| 2026-08-05 00:00 |
12:14:34.96 |
+08:32:23.4 |
HIP 59690 |
14.70 |
| 2026-08-05 12:00 |
12:14:54.56 |
+08:29:36.6 |
HIP 59690 |
18.61 |
| 2026-08-06 00:00 |
12:15:14.25 |
+08:26:49.6 |
HIP 59690 |
23.24 |
| 2026-08-06 12:00 |
12:15:34.03 |
+08:24:02.3 |
HIP 59690 |
28.24 |
| 2026-08-07 00:00 |
12:15:53.89 |
+08:21:14.7 |
HIP 59690 |
33.46 |
| 2026-08-07 12:00 |
12:16:13.83 |
+08:18:26.8 |
HIP 60013 |
36.17 |
| 2026-08-08 00:00 |
12:16:33.86 |
+08:15:38.7 |
HIP 60013 |
30.51 |
| 2026-08-08 12:00 |
12:16:53.97 |
+08:12:50.3 |
HIP 60013 |
24.84 |
| 2026-08-09 00:00 |
12:17:14.17 |
+08:10:01.6 |
HIP 60013 |
19.19 |
| 2026-08-09 12:00 |
12:17:34.45 |
+08:07:12.7 |
HIP 60013 |
13.58 |
| 2026-08-10 00:00 |
12:17:54.81 |
+08:04:23.5 |
HIP 60013 |
8.14 |
| 2026-08-10 12:00 |
12:18:15.25 |
+08:01:34.1 |
HIP 60013 |
3.85 |
| 2026-08-11 00:00 |
12:18:35.77 |
+07:58:44.4 |
HIP 60013 |
5.54 |
| 2026-08-11 12:00 |
12:18:56.37 |
+07:55:54.5 |
HIP 60013 |
10.70 |
| 2026-08-12 00:00 |
12:19:17.05 |
+07:53:04.4 |
HIP 60013 |
16.34 |
| 2026-08-12 12:00 |
12:19:37.81 |
+07:50:14.1 |
HIP 60013 |
22.10 |
| 2026-08-13 00:00 |
12:19:58.65 |
+07:47:23.5 |
HIP 60272 |
22.57 |
| 2026-08-13 12:00 |
12:20:19.56 |
+07:44:32.8 |
HIP 60272 |
17.92 |
| 2026-08-14 00:00 |
12:20:40.55 |
+07:41:41.8 |
HIP 60272 |
14.22 |
| 2026-08-14 12:00 |
12:21:01.62 |
+07:38:50.6 |
HIP 60272 |
12.38 |
| 2026-08-15 00:00 |
12:21:22.76 |
+07:35:59.2 |
HIP 60322 |
11.45 |
| 2026-08-15 12:00 |
12:21:43.97 |
+07:33:07.7 |
HIP 60322 |
6.14 |
| 2026-08-16 00:00 |
12:22:05.26 |
+07:30:15.9 |
HIP 60322 |
3.99 |
| 2026-08-16 12:00 |
12:22:26.62 |
+07:27:24.0 |
HIP 60322 |
8.15 |
| 2026-08-17 00:00 |
12:22:48.06 |
+07:24:31.9 |
HIP 60322 |
13.78 |
| 2026-08-17 12:00 |
12:23:09.56 |
+07:21:39.6 |
HIP 60322 |
19.67 |
| 2026-08-18 00:00 |
12:23:31.14 |
+07:18:47.2 |
HIP 60322 |
25.65 |
| 2026-08-18 12:00 |
12:23:52.78 |
+07:15:54.6 |
HIP 60322 |
31.68 |
| 2026-08-19 00:00 |
12:24:14.50 |
+07:13:01.8 |
HIP 60547 |
35.86 |