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 |
0.935 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
09:42:01.19 |
-23:43:08.1 |
HIP 47592 |
12.23 |
| 2026-06-03 00:00 |
09:42:07.35 |
-23:41:45.7 |
HIP 47522 |
13.12 |
| 2026-06-03 12:00 |
09:42:13.57 |
-23:40:24.0 |
HIP 47522 |
13.85 |
| 2026-06-04 00:00 |
09:42:19.87 |
-23:39:02.9 |
HIP 47522 |
14.83 |
| 2026-06-04 12:00 |
09:42:26.24 |
-23:37:42.5 |
HIP 47522 |
16.01 |
| 2026-06-05 00:00 |
09:42:32.67 |
-23:36:22.7 |
HIP 47522 |
17.35 |
| 2026-06-05 12:00 |
09:42:39.17 |
-23:35:03.7 |
HIP 47522 |
18.82 |
| 2026-06-06 00:00 |
09:42:45.74 |
-23:33:45.3 |
HIP 47522 |
20.40 |
| 2026-06-06 12:00 |
09:42:52.37 |
-23:32:27.6 |
HIP 47522 |
22.06 |
| 2026-06-07 00:00 |
09:42:59.07 |
-23:31:10.6 |
HIP 47798 |
23.18 |
| 2026-06-07 12:00 |
09:43:05.84 |
-23:29:54.3 |
HIP 47798 |
21.87 |
| 2026-06-08 00:00 |
09:43:12.67 |
-23:28:38.7 |
HIP 47788 |
20.32 |
| 2026-06-08 12:00 |
09:43:19.57 |
-23:27:23.8 |
HIP 47788 |
18.42 |
| 2026-06-09 00:00 |
09:43:26.53 |
-23:26:09.5 |
HIP 47788 |
16.53 |
| 2026-06-09 12:00 |
09:43:33.56 |
-23:24:56.0 |
HIP 47788 |
14.67 |
| 2026-06-10 00:00 |
09:43:40.65 |
-23:23:43.2 |
HIP 47788 |
12.84 |
| 2026-06-10 12:00 |
09:43:47.81 |
-23:22:31.1 |
HIP 47788 |
11.07 |
| 2026-06-11 00:00 |
09:43:55.03 |
-23:21:19.6 |
HIP 47788 |
9.39 |
| 2026-06-11 12:00 |
09:44:02.31 |
-23:20:08.9 |
HIP 47788 |
7.87 |
| 2026-06-12 00:00 |
09:44:09.66 |
-23:18:58.9 |
HIP 47788 |
6.61 |
| 2026-06-12 12:00 |
09:44:17.06 |
-23:17:49.7 |
HIP 47788 |
5.80 |
| 2026-06-13 00:00 |
09:44:24.53 |
-23:16:41.1 |
HIP 47788 |
5.65 |
| 2026-06-13 12:00 |
09:44:32.06 |
-23:15:33.3 |
HIP 47788 |
6.20 |
| 2026-06-14 00:00 |
09:44:39.65 |
-23:14:26.1 |
HIP 47788 |
7.31 |
| 2026-06-14 12:00 |
09:44:47.30 |
-23:13:19.7 |
HIP 47788 |
8.77 |
| 2026-06-15 00:00 |
09:44:55.01 |
-23:12:14.1 |
HIP 47788 |
10.43 |
| 2026-06-15 12:00 |
09:45:02.78 |
-23:11:09.1 |
HIP 47788 |
12.22 |
| 2026-06-16 00:00 |
09:45:10.61 |
-23:10:04.9 |
HIP 47788 |
14.08 |
| 2026-06-16 12:00 |
09:45:18.50 |
-23:09:01.4 |
HIP 47788 |
16.01 |
| 2026-06-17 00:00 |
09:45:26.45 |
-23:07:58.7 |
HIP 47788 |
17.97 |
| 2026-06-17 12:00 |
09:45:34.45 |
-23:06:56.7 |
HIP 47788 |
19.96 |
| 2026-06-18 00:00 |
09:45:42.51 |
-23:05:55.4 |
HIP 47788 |
21.97 |
| 2026-06-18 12:00 |
09:45:50.62 |
-23:04:54.8 |
HIP 47788 |
24.00 |
| 2026-06-19 00:00 |
09:45:58.80 |
-23:03:55.0 |
HIP 47954 |
25.14 |
| 2026-06-19 12:00 |
09:46:07.02 |
-23:02:55.9 |
HIP 47954 |
23.90 |
| 2026-06-20 00:00 |
09:46:15.31 |
-23:01:57.6 |
HIP 47954 |
22.81 |
| 2026-06-20 12:00 |
09:46:23.64 |
-23:01:00.0 |
HIP 47954 |
21.89 |
| 2026-06-21 00:00 |
09:46:32.03 |
-23:00:03.2 |
HIP 47954 |
21.16 |
| 2026-06-21 12:00 |
09:46:40.47 |
-22:59:07.0 |
HIP 47954 |
20.65 |
| 2026-06-22 00:00 |
09:46:48.97 |
-22:58:11.7 |
HIP 47954 |
20.37 |