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) |
| 2026-09-20 00:00 |
12:49:22.92 |
+04:06:31.5 |
HIP 62596 |
17.68 |
| 2026-09-20 12:00 |
12:49:47.96 |
+04:03:37.6 |
HIP 62596 |
14.90 |
| 2026-09-21 00:00 |
12:50:13.03 |
+04:00:43.8 |
HIP 62596 |
15.03 |
| 2026-09-21 12:00 |
12:50:38.13 |
+03:57:50.2 |
HIP 62596 |
18.04 |
| 2026-09-22 00:00 |
12:51:03.26 |
+03:54:56.7 |
HIP 62704 |
19.08 |
| 2026-09-22 12:00 |
12:51:28.42 |
+03:52:03.4 |
HIP 62704 |
17.81 |
| 2026-09-23 00:00 |
12:51:53.62 |
+03:49:10.2 |
HIP 62704 |
19.13 |
| 2026-09-23 12:00 |
12:52:18.84 |
+03:46:17.1 |
HIP 62704 |
22.60 |
| 2026-09-24 00:00 |
12:52:44.10 |
+03:43:24.2 |
HIP 62704 |
27.42 |
| 2026-09-24 12:00 |
12:53:09.38 |
+03:40:31.4 |
HIP 62704 |
33.01 |
| 2026-09-25 00:00 |
12:53:34.70 |
+03:37:38.9 |
HIP 63090 |
33.37 |
| 2026-09-25 12:00 |
12:54:00.04 |
+03:34:46.4 |
HIP 63090 |
26.43 |
| 2026-09-26 00:00 |
12:54:25.40 |
+03:31:54.2 |
HIP 63090 |
19.48 |
| 2026-09-26 12:00 |
12:54:50.80 |
+03:29:02.1 |
HIP 63090 |
12.52 |
| 2026-09-27 00:00 |
12:55:16.22 |
+03:26:10.1 |
HIP 63090 |
5.56 |
| 2026-09-27 12:00 |
12:55:41.67 |
+03:23:18.4 |
HIP 63090 |
1.41 |
| 2026-09-28 00:00 |
12:56:07.15 |
+03:20:26.8 |
HIP 63090 |
8.38 |
| 2026-09-28 12:00 |
12:56:32.65 |
+03:17:35.4 |
HIP 63090 |
15.35 |
| 2026-09-29 00:00 |
12:56:58.17 |
+03:14:44.2 |
HIP 63090 |
22.33 |
| 2026-09-29 12:00 |
12:57:23.72 |
+03:11:53.2 |
HIP 63090 |
29.32 |
| 2026-09-30 00:00 |
12:57:49.30 |
+03:09:02.4 |
HIP 63437 |
32.18 |
| 2026-09-30 12:00 |
12:58:14.90 |
+03:06:11.8 |
HIP 63437 |
25.48 |
| 2026-10-01 00:00 |
12:58:40.52 |
+03:03:21.3 |
HIP 63437 |
18.99 |
| 2026-10-01 12:00 |
12:59:06.17 |
+03:00:31.1 |
HIP 63437 |
13.03 |
| 2026-10-02 00:00 |
12:59:31.84 |
+02:57:41.1 |
HIP 63437 |
8.76 |
| 2026-10-02 12:00 |
12:59:57.53 |
+02:54:51.3 |
HIP 63437 |
9.05 |
| 2026-10-03 00:00 |
13:00:23.24 |
+02:52:01.7 |
HIP 63437 |
13.62 |
| 2026-10-03 12:00 |
13:00:48.97 |
+02:49:12.4 |
HIP 63437 |
19.68 |
| 2026-10-04 00:00 |
13:01:14.73 |
+02:46:23.3 |
HIP 63437 |
26.23 |
| 2026-10-04 12:00 |
13:01:40.50 |
+02:43:34.4 |
HIP 63455 |
30.77 |
| 2026-10-05 00:00 |
13:02:06.29 |
+02:40:45.7 |
HIP 63455 |
34.30 |
| 2026-10-05 12:00 |
13:02:32.11 |
+02:37:57.3 |
HIP 63455 |
38.79 |
| 2026-10-06 00:00 |
13:02:57.94 |
+02:35:09.1 |
HIP 63455 |
43.97 |
| 2026-10-06 12:00 |
13:03:23.79 |
+02:32:21.2 |
HIP 63944 |
44.15 |
| 2026-10-07 00:00 |
13:03:49.65 |
+02:29:33.5 |
HIP 63944 |
38.68 |
| 2026-10-07 12:00 |
13:04:15.53 |
+02:26:46.1 |
HIP 63944 |
33.78 |
| 2026-10-08 00:00 |
13:04:41.43 |
+02:23:59.0 |
HIP 63944 |
29.74 |
| 2026-10-08 12:00 |
13:05:07.35 |
+02:21:12.1 |
HIP 63944 |
26.97 |
| 2026-10-09 00:00 |
13:05:33.28 |
+02:18:25.5 |
HIP 63944 |
25.87 |
| 2026-10-09 12:00 |
13:05:59.22 |
+02:15:39.2 |
HIP 64045 |
24.56 |
| 2026-10-10 00:00 |
13:06:25.18 |
+02:12:53.2 |
HIP 64045 |
17.60 |
| 2026-10-10 12:00 |
13:06:51.15 |
+02:10:07.5 |
HIP 64045 |
10.76 |
| 2026-10-11 00:00 |
13:07:17.13 |
+02:07:22.0 |
HIP 64045 |
4.59 |