C/2020 R2 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
09:54:39.31 |
-30:16:22.6 |
HIP 48749 |
26.79 |
| 2026-02-03 12:00 |
09:54:30.50 |
-30:15:50.0 |
HIP 48749 |
28.43 |
| 2026-02-04 00:00 |
09:54:21.66 |
-30:15:16.2 |
HIP 48749 |
30.11 |
| 2026-02-04 12:00 |
09:54:12.81 |
-30:14:41.2 |
HIP 48508 |
31.60 |
| 2026-02-05 00:00 |
09:54:03.93 |
-30:14:05.2 |
HIP 48508 |
30.55 |
| 2026-02-05 12:00 |
09:53:55.04 |
-30:13:28.1 |
HIP 48508 |
29.58 |
| 2026-02-06 00:00 |
09:53:46.12 |
-30:12:49.8 |
HIP 48508 |
28.70 |
| 2026-02-06 12:00 |
09:53:37.19 |
-30:12:10.5 |
HIP 48508 |
27.93 |
| 2026-02-07 00:00 |
09:53:28.25 |
-30:11:30.0 |
HIP 48508 |
27.26 |
| 2026-02-07 12:00 |
09:53:19.29 |
-30:10:48.5 |
HIP 48508 |
26.73 |
| 2026-02-08 00:00 |
09:53:10.32 |
-30:10:05.8 |
HIP 48508 |
26.32 |
| 2026-02-08 12:00 |
09:53:01.33 |
-30:09:22.1 |
HIP 48508 |
26.06 |
| 2026-02-09 00:00 |
09:52:52.34 |
-30:08:37.2 |
HIP 48508 |
25.94 |
| 2026-02-09 12:00 |
09:52:43.33 |
-30:07:51.2 |
HIP 48508 |
25.98 |
| 2026-02-10 00:00 |
09:52:34.32 |
-30:07:04.2 |
HIP 48508 |
26.17 |
| 2026-02-10 12:00 |
09:52:25.30 |
-30:06:16.1 |
HIP 48508 |
26.51 |
| 2026-02-11 00:00 |
09:52:16.27 |
-30:05:26.8 |
HIP 48508 |
27.00 |
| 2026-02-11 12:00 |
09:52:07.23 |
-30:04:36.5 |
HIP 48508 |
27.63 |
| 2026-02-12 00:00 |
09:51:58.20 |
-30:03:45.1 |
HIP 48240 |
26.43 |
| 2026-02-12 12:00 |
09:51:49.16 |
-30:02:52.7 |
HIP 48240 |
24.29 |
| 2026-02-13 00:00 |
09:51:40.12 |
-30:01:59.1 |
HIP 48240 |
22.14 |
| 2026-02-13 12:00 |
09:51:31.08 |
-30:01:04.5 |
HIP 48240 |
19.99 |
| 2026-02-14 00:00 |
09:51:22.04 |
-30:00:08.9 |
HIP 48240 |
17.84 |
| 2026-02-14 12:00 |
09:51:13.00 |
-29:59:12.1 |
HIP 48240 |
15.68 |
| 2026-02-15 00:00 |
09:51:03.96 |
-29:58:14.3 |
HIP 48240 |
13.53 |
| 2026-02-15 12:00 |
09:50:54.93 |
-29:57:15.5 |
HIP 48240 |
11.38 |
| 2026-02-16 00:00 |
09:50:45.91 |
-29:56:15.6 |
HIP 48240 |
9.24 |
| 2026-02-16 12:00 |
09:50:36.89 |
-29:55:14.7 |
HIP 48240 |
7.14 |
| 2026-02-17 00:00 |
09:50:27.89 |
-29:54:12.7 |
HIP 48240 |
5.13 |
| 2026-02-17 12:00 |
09:50:18.89 |
-29:53:09.7 |
HIP 48240 |
3.39 |
| 2026-02-18 00:00 |
09:50:09.90 |
-29:52:05.6 |
HIP 48240 |
2.54 |
| 2026-02-18 12:00 |
09:50:00.92 |
-29:51:00.6 |
HIP 48240 |
3.38 |
| 2026-02-19 00:00 |
09:49:51.96 |
-29:49:54.5 |
HIP 48240 |
5.14 |
| 2026-02-19 12:00 |
09:49:43.01 |
-29:48:47.4 |
HIP 48240 |
7.19 |
| 2026-02-20 00:00 |
09:49:34.08 |
-29:47:39.4 |
HIP 48240 |
9.33 |
| 2026-02-20 12:00 |
09:49:25.17 |
-29:46:30.3 |
HIP 48240 |
11.52 |
| 2026-02-21 00:00 |
09:49:16.27 |
-29:45:20.2 |
HIP 48240 |
13.74 |
| 2026-02-21 12:00 |
09:49:07.39 |
-29:44:09.2 |
HIP 48240 |
15.97 |
| 2026-02-22 00:00 |
09:48:58.54 |
-29:42:57.1 |
HIP 48240 |
18.22 |
| 2026-02-22 12:00 |
09:48:49.70 |
-29:41:44.2 |
HIP 48240 |
20.48 |
| 2026-02-23 00:00 |
09:48:40.89 |
-29:40:30.2 |
HIP 48011 |
20.23 |
| 2026-02-23 12:00 |
09:48:32.10 |
-29:39:15.3 |
HIP 48011 |
19.07 |
| 2026-02-24 00:00 |
09:48:23.34 |
-29:37:59.4 |
HIP 48011 |
18.14 |