メタデータ
| 項目 |
値 |
| Designation |
C/2020 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-02-24T07:21:20.217600Z |
| Orbit solution date (soln_date, UTC) |
2024-03-19T12:12:36Z |
| Obs used |
386 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
11.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-12T07:30:45.878400Z |
| Discovery magnitude (MPC) |
20.51 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) |
2021-07-17.0000000 |
| e |
0.98865011 |
| q (au) |
4.692155 |
| a (au) |
413.409849 |
| i (deg) |
53.224771 |
| Ω (om, deg) |
195.092039 |
| ω (w, deg) |
211.709686 |
| M (ma, deg) |
359.973933 |
等級
散乱 + 全体線形
$$
M_a = (7.419 + 4.508\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.419 |
| n |
4.508 |
| gf |
0.925 |
| gb |
-0.960 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
09:38:47.55 |
-24:51:57.4 |
HIP 47159 |
31.91 |
| 2026-05-12 12:00 |
09:38:50.36 |
-24:50:09.7 |
HIP 47159 |
32.02 |
| 2026-05-13 00:00 |
09:38:53.25 |
-24:48:22.4 |
HIP 47159 |
32.27 |
| 2026-05-13 12:00 |
09:38:56.23 |
-24:46:35.6 |
HIP 47159 |
32.65 |
| 2026-05-14 00:00 |
09:38:59.29 |
-24:44:49.4 |
HIP 47159 |
33.16 |
| 2026-05-14 12:00 |
09:39:02.44 |
-24:43:03.6 |
HIP 47159 |
33.78 |
| 2026-05-15 00:00 |
09:39:05.67 |
-24:41:18.3 |
HIP 47159 |
34.52 |
| 2026-05-15 12:00 |
09:39:08.98 |
-24:39:33.6 |
HIP 47159 |
35.36 |
| 2026-05-16 00:00 |
09:39:12.38 |
-24:37:49.3 |
HIP 47159 |
36.30 |
| 2026-05-16 12:00 |
09:39:15.86 |
-24:36:05.6 |
HIP 47365 |
35.99 |
| 2026-05-17 00:00 |
09:39:19.42 |
-24:34:22.5 |
HIP 47365 |
34.35 |
| 2026-05-17 12:00 |
09:39:23.07 |
-24:32:39.8 |
HIP 47365 |
32.76 |
| 2026-05-18 00:00 |
09:39:26.80 |
-24:30:57.8 |
HIP 47365 |
31.22 |
| 2026-05-18 12:00 |
09:39:30.61 |
-24:29:16.2 |
HIP 47365 |
29.73 |
| 2026-05-19 00:00 |
09:39:34.51 |
-24:27:35.2 |
HIP 47365 |
28.31 |
| 2026-05-19 12:00 |
09:39:38.48 |
-24:25:54.8 |
HIP 47365 |
26.96 |
| 2026-05-20 00:00 |
09:39:42.54 |
-24:24:15.0 |
HIP 47365 |
25.69 |
| 2026-05-20 12:00 |
09:39:46.68 |
-24:22:35.7 |
HIP 47365 |
24.53 |
| 2026-05-21 00:00 |
09:39:50.89 |
-24:20:57.0 |
HIP 47365 |
23.47 |
| 2026-05-21 12:00 |
09:39:55.19 |
-24:19:18.9 |
HIP 47365 |
22.55 |
| 2026-05-22 00:00 |
09:39:59.57 |
-24:17:41.3 |
HIP 47365 |
21.78 |
| 2026-05-22 12:00 |
09:40:04.02 |
-24:16:04.4 |
HIP 47365 |
21.17 |
| 2026-05-23 00:00 |
09:40:08.56 |
-24:14:28.0 |
HIP 47365 |
20.73 |
| 2026-05-23 12:00 |
09:40:13.17 |
-24:12:52.3 |
HIP 47365 |
20.49 |
| 2026-05-24 00:00 |
09:40:17.86 |
-24:11:17.1 |
HIP 47365 |
20.45 |
| 2026-05-24 12:00 |
09:40:22.63 |
-24:09:42.6 |
HIP 47365 |
20.60 |
| 2026-05-25 00:00 |
09:40:27.47 |
-24:08:08.6 |
HIP 47365 |
20.95 |
| 2026-05-25 12:00 |
09:40:32.39 |
-24:06:35.3 |
HIP 47365 |
21.49 |
| 2026-05-26 00:00 |
09:40:37.39 |
-24:05:02.6 |
HIP 47365 |
22.20 |
| 2026-05-26 12:00 |
09:40:42.46 |
-24:03:30.5 |
HIP 47592 |
22.73 |
| 2026-05-27 00:00 |
09:40:47.61 |
-24:01:59.0 |
HIP 47592 |
21.09 |
| 2026-05-27 12:00 |
09:40:52.83 |
-24:00:28.2 |
HIP 47592 |
19.49 |
| 2026-05-28 00:00 |
09:40:58.13 |
-23:58:58.0 |
HIP 47592 |
17.94 |
| 2026-05-28 12:00 |
09:41:03.50 |
-23:57:28.4 |
HIP 47592 |
16.45 |
| 2026-05-29 00:00 |
09:41:08.94 |
-23:55:59.5 |
HIP 47592 |
15.05 |
| 2026-05-29 12:00 |
09:41:14.46 |
-23:54:31.2 |
HIP 47592 |
13.77 |
| 2026-05-30 00:00 |
09:41:20.05 |
-23:53:03.5 |
HIP 47592 |
12.63 |
| 2026-05-30 12:00 |
09:41:25.71 |
-23:51:36.5 |
HIP 47592 |
11.69 |
| 2026-05-31 00:00 |
09:41:31.45 |
-23:50:10.1 |
HIP 47592 |
10.99 |
| 2026-05-31 12:00 |
09:41:37.26 |
-23:48:44.4 |
HIP 47592 |
10.58 |
| 2026-06-01 00:00 |
09:41:43.13 |
-23:47:19.4 |
HIP 47592 |
10.51 |
| 2026-06-01 12:00 |
09:41:49.08 |
-23:45:55.0 |
HIP 47592 |
10.78 |
| 2026-06-02 00:00 |
09:41:55.10 |
-23:44:31.2 |
HIP 47592 |
11.37 |