P/2020 S5 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
15:17:24.82 |
-30:44:20.6 |
HIP 74865 |
17.04 |
| 2026-02-03 12:00 |
15:17:39.00 |
-30:46:21.5 |
HIP 74865 |
18.05 |
| 2026-02-04 00:00 |
15:17:53.01 |
-30:48:22.1 |
HIP 74865 |
19.69 |
| 2026-02-04 12:00 |
15:18:06.85 |
-30:50:22.2 |
HIP 74865 |
21.81 |
| 2026-02-05 00:00 |
15:18:20.51 |
-30:52:22.1 |
HIP 74929 |
20.68 |
| 2026-02-05 12:00 |
15:18:34.01 |
-30:54:21.5 |
HIP 74929 |
18.27 |
| 2026-02-06 00:00 |
15:18:47.32 |
-30:56:20.6 |
HIP 74929 |
16.27 |
| 2026-02-06 12:00 |
15:19:00.46 |
-30:58:19.2 |
HIP 74929 |
14.82 |
| 2026-02-07 00:00 |
15:19:13.43 |
-31:00:17.5 |
HIP 74929 |
14.06 |
| 2026-02-07 12:00 |
15:19:26.21 |
-31:02:15.4 |
HIP 74929 |
14.09 |
| 2026-02-08 00:00 |
15:19:38.81 |
-31:04:12.9 |
HIP 74929 |
14.87 |
| 2026-02-08 12:00 |
15:19:51.24 |
-31:06:10.0 |
HIP 74929 |
16.27 |
| 2026-02-09 00:00 |
15:20:03.48 |
-31:08:06.7 |
HIP 75053 |
18.00 |
| 2026-02-09 12:00 |
15:20:15.53 |
-31:10:03.0 |
HIP 75053 |
19.86 |
| 2026-02-10 00:00 |
15:20:27.40 |
-31:11:58.9 |
HIP 75053 |
22.02 |
| 2026-02-10 12:00 |
15:20:39.08 |
-31:13:54.3 |
HIP 75053 |
24.39 |
| 2026-02-11 00:00 |
15:20:50.57 |
-31:15:49.3 |
HIP 75200 |
22.45 |
| 2026-02-11 12:00 |
15:21:01.88 |
-31:17:43.9 |
HIP 75200 |
19.41 |
| 2026-02-12 00:00 |
15:21:12.99 |
-31:19:38.1 |
HIP 75200 |
16.42 |
| 2026-02-12 12:00 |
15:21:23.91 |
-31:21:31.8 |
HIP 75200 |
13.48 |
| 2026-02-13 00:00 |
15:21:34.64 |
-31:23:25.1 |
HIP 75200 |
10.60 |
| 2026-02-13 12:00 |
15:21:45.17 |
-31:25:17.9 |
HIP 75200 |
7.82 |
| 2026-02-14 00:00 |
15:21:55.50 |
-31:27:10.3 |
HIP 75200 |
5.22 |
| 2026-02-14 12:00 |
15:22:05.64 |
-31:29:02.2 |
HIP 75200 |
3.18 |
| 2026-02-15 00:00 |
15:22:15.58 |
-31:30:53.6 |
HIP 75200 |
3.01 |
| 2026-02-15 12:00 |
15:22:25.32 |
-31:32:44.6 |
HIP 75200 |
4.84 |
| 2026-02-16 00:00 |
15:22:34.85 |
-31:34:35.1 |
HIP 75200 |
7.26 |
| 2026-02-16 12:00 |
15:22:44.19 |
-31:36:25.1 |
HIP 75200 |
9.80 |
| 2026-02-17 00:00 |
15:22:53.32 |
-31:38:14.6 |
HIP 75200 |
12.37 |
| 2026-02-17 12:00 |
15:23:02.25 |
-31:40:03.6 |
HIP 75200 |
14.93 |
| 2026-02-18 00:00 |
15:23:10.96 |
-31:41:52.1 |
HIP 75200 |
17.47 |
| 2026-02-18 12:00 |
15:23:19.48 |
-31:43:40.1 |
HIP 75438 |
17.86 |
| 2026-02-19 00:00 |
15:23:27.78 |
-31:45:27.6 |
HIP 75438 |
16.03 |
| 2026-02-19 12:00 |
15:23:35.87 |
-31:47:14.6 |
HIP 75438 |
14.44 |
| 2026-02-20 00:00 |
15:23:43.76 |
-31:49:01.0 |
HIP 75438 |
13.17 |
| 2026-02-20 12:00 |
15:23:51.43 |
-31:50:47.0 |
HIP 75438 |
12.31 |
| 2026-02-21 00:00 |
15:23:58.89 |
-31:52:32.4 |
HIP 75438 |
11.90 |
| 2026-02-21 12:00 |
15:24:06.14 |
-31:54:17.2 |
HIP 75438 |
11.98 |
| 2026-02-22 00:00 |
15:24:13.17 |
-31:56:01.5 |
HIP 75438 |
12.51 |
| 2026-02-22 12:00 |
15:24:19.98 |
-31:57:45.2 |
HIP 75445 |
12.25 |
| 2026-02-23 00:00 |
15:24:26.58 |
-31:59:28.4 |
HIP 75445 |
10.08 |
| 2026-02-23 12:00 |
15:24:32.97 |
-32:01:11.0 |
HIP 75445 |
7.96 |
| 2026-02-24 00:00 |
15:24:39.13 |
-32:02:53.0 |
HIP 75445 |
5.90 |