メタデータ
| 項目 |
値 |
| Designation |
P/2020 S5 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-08-08T07:36:05.472000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:12Z |
| Obs used |
74 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-21T13:27:24.220800Z |
| Discovery magnitude (MPC) |
20.40 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) |
2020-10-14.0000000 |
| e |
0.33831667 |
| q (au) |
2.678655 |
| a (au) |
4.048244 |
| i (deg) |
12.354134 |
| Ω (om, deg) |
316.000132 |
| ω (w, deg) |
52.998514 |
| M (ma, deg) |
8.069024 |
等級
散乱 + 全体線形
$$
M_a = (15.871 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.871 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-09-20 00:00 |
15:06:41.68 |
-28:35:07.9 |
HIP 73976 |
15.24 |
| 2026-09-20 12:00 |
15:07:08.03 |
-28:35:47.1 |
HIP 73976 |
13.60 |
| 2026-09-21 00:00 |
15:07:34.50 |
-28:36:26.9 |
HIP 73976 |
14.33 |
| 2026-09-21 12:00 |
15:08:01.10 |
-28:37:07.2 |
HIP 74025 |
16.84 |
| 2026-09-22 00:00 |
15:08:27.82 |
-28:37:48.2 |
HIP 74149 |
17.97 |
| 2026-09-22 12:00 |
15:08:54.66 |
-28:38:29.7 |
HIP 74149 |
16.88 |
| 2026-09-23 00:00 |
15:09:21.63 |
-28:39:11.8 |
HIP 74245 |
17.18 |
| 2026-09-23 12:00 |
15:09:48.72 |
-28:39:54.4 |
HIP 74245 |
13.87 |
| 2026-09-24 00:00 |
15:10:15.92 |
-28:40:37.5 |
HIP 74245 |
12.71 |
| 2026-09-24 12:00 |
15:10:43.25 |
-28:41:21.2 |
HIP 74245 |
14.27 |
| 2026-09-25 00:00 |
15:11:10.69 |
-28:42:05.5 |
HIP 74245 |
17.87 |
| 2026-09-25 12:00 |
15:11:38.26 |
-28:42:50.2 |
HIP 74245 |
22.59 |
| 2026-09-26 00:00 |
15:12:05.94 |
-28:43:35.5 |
HIP 74524 |
26.32 |
| 2026-09-26 12:00 |
15:12:33.74 |
-28:44:21.3 |
HIP 74524 |
21.16 |
| 2026-09-27 00:00 |
15:13:01.65 |
-28:45:07.5 |
HIP 74524 |
16.65 |
| 2026-09-27 12:00 |
15:13:29.68 |
-28:45:54.3 |
HIP 74524 |
13.49 |
| 2026-09-28 00:00 |
15:13:57.82 |
-28:46:41.6 |
HIP 74524 |
12.78 |
| 2026-09-28 12:00 |
15:14:26.08 |
-28:47:29.4 |
HIP 74524 |
14.91 |
| 2026-09-29 00:00 |
15:14:54.46 |
-28:48:17.6 |
HIP 74612 |
16.44 |
| 2026-09-29 12:00 |
15:15:22.94 |
-28:49:06.3 |
HIP 74612 |
17.84 |
| 2026-09-30 00:00 |
15:15:51.54 |
-28:49:55.5 |
HIP 74612 |
21.10 |
| 2026-09-30 12:00 |
15:16:20.25 |
-28:50:45.2 |
HIP 74823 |
15.65 |
| 2026-10-01 00:00 |
15:16:49.07 |
-28:51:35.3 |
HIP 74823 |
10.10 |
| 2026-10-01 12:00 |
15:17:18.01 |
-28:52:25.8 |
HIP 74823 |
6.34 |
| 2026-10-02 00:00 |
15:17:47.05 |
-28:53:16.8 |
HIP 74823 |
7.78 |
| 2026-10-02 12:00 |
15:18:16.20 |
-28:54:08.2 |
HIP 74823 |
12.79 |
| 2026-10-03 00:00 |
15:18:45.47 |
-28:55:00.1 |
HIP 74979 |
8.29 |
| 2026-10-03 12:00 |
15:19:14.84 |
-28:55:52.4 |
HIP 74979 |
2.81 |
| 2026-10-04 00:00 |
15:19:44.32 |
-28:56:45.1 |
HIP 74979 |
5.60 |
| 2026-10-04 12:00 |
15:20:13.91 |
-28:57:38.2 |
HIP 74979 |
11.83 |
| 2026-10-05 00:00 |
15:20:43.60 |
-28:58:31.8 |
HIP 74979 |
18.30 |
| 2026-10-05 12:00 |
15:21:13.41 |
-28:59:25.7 |
HIP 75286 |
24.68 |
| 2026-10-06 00:00 |
15:21:43.31 |
-29:00:20.1 |
HIP 75286 |
18.54 |
| 2026-10-06 12:00 |
15:22:13.33 |
-29:01:14.8 |
HIP 75286 |
12.85 |
| 2026-10-07 00:00 |
15:22:43.44 |
-29:02:09.9 |
HIP 75286 |
8.59 |
| 2026-10-07 12:00 |
15:23:13.67 |
-29:03:05.4 |
HIP 75286 |
8.42 |
| 2026-10-08 00:00 |
15:23:43.99 |
-29:04:01.3 |
HIP 75286 |
12.54 |
| 2026-10-08 12:00 |
15:24:14.42 |
-29:04:57.5 |
HIP 75286 |
18.27 |
| 2026-10-09 00:00 |
15:24:44.95 |
-29:05:54.1 |
HIP 75286 |
24.52 |
| 2026-10-09 12:00 |
15:25:15.58 |
-29:06:51.0 |
HIP 75550 |
21.75 |
| 2026-10-10 00:00 |
15:25:46.31 |
-29:07:48.3 |
HIP 75550 |
18.45 |
| 2026-10-10 12:00 |
15:26:17.14 |
-29:08:46.0 |
HIP 75550 |
17.29 |
| 2026-10-11 00:00 |
15:26:48.07 |
-29:09:43.9 |
HIP 75550 |
18.72 |