P/2020 R5 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2020 R5 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-05-28T02:51:58.855680Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:13:23Z |
| Obs used |
101 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
20.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-14T10:23:59.971200Z |
| Discovery magnitude (MPC) |
20.53 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-06-29.0000000 |
| e |
0.31447611 |
| q (au) |
3.413047 |
| a (au) |
4.978743 |
| i (deg) |
11.454347 |
| Ω (om, deg) |
272.968571 |
| ω (w, deg) |
82.307441 |
| M (ma, deg) |
2.828464 |
等級
散乱 + 全体線形
$$
M_a = (9.349 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.349 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.585 |
| k |
0.999 |
| δ90 |
9.589 |
| 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) |
| 2026-02-03 00:00 |
11:55:19.91 |
-13:20:00.7 |
HIP 58264 |
34.42 |
| 2026-02-03 12:00 |
11:55:12.47 |
-13:20:08.3 |
HIP 58264 |
35.59 |
| 2026-02-04 00:00 |
11:55:04.90 |
-13:20:14.8 |
HIP 58091 |
35.58 |
| 2026-02-04 12:00 |
11:54:57.19 |
-13:20:20.1 |
HIP 58091 |
35.52 |
| 2026-02-05 00:00 |
11:54:49.35 |
-13:20:24.2 |
HIP 58091 |
35.55 |
| 2026-02-05 12:00 |
11:54:41.38 |
-13:20:27.1 |
HIP 58091 |
35.65 |
| 2026-02-06 00:00 |
11:54:33.28 |
-13:20:28.9 |
HIP 58091 |
35.85 |
| 2026-02-06 12:00 |
11:54:25.06 |
-13:20:29.5 |
HIP 58091 |
36.13 |
| 2026-02-07 00:00 |
11:54:16.70 |
-13:20:29.0 |
HIP 58091 |
36.52 |
| 2026-02-07 12:00 |
11:54:08.22 |
-13:20:27.2 |
HIP 58091 |
37.00 |
| 2026-02-08 00:00 |
11:53:59.62 |
-13:20:24.3 |
HIP 58091 |
37.58 |
| 2026-02-08 12:00 |
11:53:50.89 |
-13:20:20.2 |
HIP 58091 |
38.26 |
| 2026-02-09 00:00 |
11:53:42.03 |
-13:20:14.9 |
HIP 57792 |
38.76 |
| 2026-02-09 12:00 |
11:53:33.05 |
-13:20:08.4 |
HIP 57792 |
36.57 |
| 2026-02-10 00:00 |
11:53:23.95 |
-13:20:00.7 |
HIP 57792 |
34.36 |
| 2026-02-10 12:00 |
11:53:14.73 |
-13:19:51.8 |
HIP 57792 |
32.11 |
| 2026-02-11 00:00 |
11:53:05.39 |
-13:19:41.8 |
HIP 57792 |
29.84 |
| 2026-02-11 12:00 |
11:52:55.94 |
-13:19:30.6 |
HIP 57792 |
27.54 |
| 2026-02-12 00:00 |
11:52:46.36 |
-13:19:18.1 |
HIP 57792 |
25.21 |
| 2026-02-12 12:00 |
11:52:36.67 |
-13:19:04.5 |
HIP 57792 |
22.85 |
| 2026-02-13 00:00 |
11:52:26.86 |
-13:18:49.7 |
HIP 57792 |
20.47 |
| 2026-02-13 12:00 |
11:52:16.94 |
-13:18:33.8 |
HIP 57792 |
18.07 |
| 2026-02-14 00:00 |
11:52:06.91 |
-13:18:16.6 |
HIP 57792 |
15.65 |
| 2026-02-14 12:00 |
11:51:56.77 |
-13:17:58.2 |
HIP 57792 |
13.22 |
| 2026-02-15 00:00 |
11:51:46.52 |
-13:17:38.7 |
HIP 57792 |
10.79 |
| 2026-02-15 12:00 |
11:51:36.16 |
-13:17:18.0 |
HIP 57792 |
8.40 |
| 2026-02-16 00:00 |
11:51:25.69 |
-13:16:56.1 |
HIP 57792 |
6.10 |
| 2026-02-16 12:00 |
11:51:15.12 |
-13:16:33.0 |
HIP 57792 |
4.14 |
| 2026-02-17 00:00 |
11:51:04.45 |
-13:16:08.8 |
HIP 57792 |
3.28 |
| 2026-02-17 12:00 |
11:50:53.67 |
-13:15:43.3 |
HIP 57792 |
4.29 |
| 2026-02-18 00:00 |
11:50:42.79 |
-13:15:16.7 |
HIP 57792 |
6.36 |
| 2026-02-18 12:00 |
11:50:31.82 |
-13:14:49.0 |
HIP 57792 |
8.81 |
| 2026-02-19 00:00 |
11:50:20.74 |
-13:14:20.1 |
HIP 57792 |
11.40 |
| 2026-02-19 12:00 |
11:50:09.57 |
-13:13:50.0 |
HIP 57792 |
14.08 |
| 2026-02-20 00:00 |
11:49:58.31 |
-13:13:18.7 |
HIP 57792 |
16.82 |
| 2026-02-20 12:00 |
11:49:46.96 |
-13:12:46.4 |
HIP 57792 |
19.59 |
| 2026-02-21 00:00 |
11:49:35.51 |
-13:12:12.8 |
HIP 57792 |
22.41 |
| 2026-02-21 12:00 |
11:49:23.97 |
-13:11:38.2 |
HIP 57654 |
23.02 |
| 2026-02-22 00:00 |
11:49:12.35 |
-13:11:02.3 |
HIP 57654 |
22.66 |
| 2026-02-22 12:00 |
11:49:00.64 |
-13:10:25.4 |
HIP 57654 |
22.66 |
| 2026-02-23 00:00 |
11:48:48.85 |
-13:09:47.3 |
HIP 57654 |
23.02 |
| 2026-02-23 12:00 |
11:48:36.98 |
-13:09:08.2 |
HIP 57654 |
23.74 |
| 2026-02-24 00:00 |
11:48:25.02 |
-13:08:27.9 |
HIP 57654 |
24.79 |