メタデータ
| 項目 |
値 |
| Designation |
C/2020 Q2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-02-06T10:13:35.472000Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:12:49Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-08-22T09:39:13.363200Z |
| Discovery magnitude (MPC) |
21.03 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) |
2020-09-06.0000000 |
| e |
0.50559490 |
| q (au) |
5.399394 |
| a (au) |
10.920993 |
| i (deg) |
3.310350 |
| Ω (om, deg) |
179.948112 |
| ω (w, deg) |
118.449735 |
| M (ma, deg) |
5.805249 |
等級
散乱 + 全体線形
$$
M_a = (9.351 + 4.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.351 |
| n |
4.380 |
| gf |
1.000 |
| gb |
-0.934 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:27:49.08 |
+18:37:36.7 |
HIP 20782 |
27.00 |
| 2026-09-20 12:00 |
04:27:48.09 |
+18:37:25.3 |
HIP 20782 |
26.74 |
| 2026-09-21 00:00 |
04:27:47.01 |
+18:37:13.7 |
HIP 20782 |
26.46 |
| 2026-09-21 12:00 |
04:27:45.84 |
+18:37:02.0 |
HIP 20782 |
26.18 |
| 2026-09-22 00:00 |
04:27:44.58 |
+18:36:50.0 |
HIP 20782 |
25.89 |
| 2026-09-22 12:00 |
04:27:43.22 |
+18:36:37.9 |
HIP 20782 |
25.58 |
| 2026-09-23 00:00 |
04:27:41.78 |
+18:36:25.5 |
HIP 20782 |
25.27 |
| 2026-09-23 12:00 |
04:27:40.24 |
+18:36:13.0 |
HIP 20782 |
24.96 |
| 2026-09-24 00:00 |
04:27:38.61 |
+18:36:00.3 |
HIP 20782 |
24.63 |
| 2026-09-24 12:00 |
04:27:36.89 |
+18:35:47.4 |
HIP 20782 |
24.30 |
| 2026-09-25 00:00 |
04:27:35.07 |
+18:35:34.3 |
HIP 20782 |
23.97 |
| 2026-09-25 12:00 |
04:27:33.17 |
+18:35:21.0 |
HIP 20782 |
23.63 |
| 2026-09-26 00:00 |
04:27:31.17 |
+18:35:07.5 |
HIP 20782 |
23.28 |
| 2026-09-26 12:00 |
04:27:29.09 |
+18:34:53.8 |
HIP 20782 |
22.94 |
| 2026-09-27 00:00 |
04:27:26.91 |
+18:34:40.0 |
HIP 20782 |
22.60 |
| 2026-09-27 12:00 |
04:27:24.64 |
+18:34:26.0 |
HIP 20782 |
22.26 |
| 2026-09-28 00:00 |
04:27:22.28 |
+18:34:11.8 |
HIP 20782 |
21.92 |
| 2026-09-28 12:00 |
04:27:19.84 |
+18:33:57.4 |
HIP 20782 |
21.59 |
| 2026-09-29 00:00 |
04:27:17.30 |
+18:33:42.8 |
HIP 20782 |
21.26 |
| 2026-09-29 12:00 |
04:27:14.67 |
+18:33:28.1 |
HIP 20782 |
20.95 |
| 2026-09-30 00:00 |
04:27:11.95 |
+18:33:13.1 |
HIP 20782 |
20.65 |
| 2026-09-30 12:00 |
04:27:09.15 |
+18:32:58.0 |
HIP 20782 |
20.36 |
| 2026-10-01 00:00 |
04:27:06.25 |
+18:32:42.7 |
HIP 20782 |
20.09 |
| 2026-10-01 12:00 |
04:27:03.27 |
+18:32:27.3 |
HIP 20782 |
19.84 |
| 2026-10-02 00:00 |
04:27:00.19 |
+18:32:11.6 |
HIP 20782 |
19.62 |
| 2026-10-02 12:00 |
04:26:57.03 |
+18:31:55.8 |
HIP 20782 |
19.43 |
| 2026-10-03 00:00 |
04:26:53.78 |
+18:31:39.8 |
HIP 20782 |
19.26 |
| 2026-10-03 12:00 |
04:26:50.44 |
+18:31:23.7 |
HIP 20782 |
19.13 |
| 2026-10-04 00:00 |
04:26:47.01 |
+18:31:07.3 |
HIP 20782 |
19.04 |
| 2026-10-04 12:00 |
04:26:43.50 |
+18:30:50.8 |
HIP 20782 |
18.99 |
| 2026-10-05 00:00 |
04:26:39.89 |
+18:30:34.2 |
HIP 20782 |
18.99 |
| 2026-10-05 12:00 |
04:26:36.20 |
+18:30:17.3 |
HIP 20782 |
19.03 |
| 2026-10-06 00:00 |
04:26:32.43 |
+18:30:00.3 |
HIP 20782 |
19.12 |
| 2026-10-06 12:00 |
04:26:28.56 |
+18:29:43.1 |
HIP 20782 |
19.26 |
| 2026-10-07 00:00 |
04:26:24.62 |
+18:29:25.8 |
HIP 20782 |
19.46 |
| 2026-10-07 12:00 |
04:26:20.58 |
+18:29:08.3 |
HIP 20780 |
19.72 |
| 2026-10-08 00:00 |
04:26:16.46 |
+18:28:50.6 |
HIP 20780 |
20.01 |
| 2026-10-08 12:00 |
04:26:12.26 |
+18:28:32.8 |
HIP 20780 |
20.37 |
| 2026-10-09 00:00 |
04:26:07.97 |
+18:28:14.8 |
HIP 20780 |
20.78 |
| 2026-10-09 12:00 |
04:26:03.59 |
+18:27:56.6 |
HIP 20780 |
21.24 |
| 2026-10-10 00:00 |
04:25:59.14 |
+18:27:38.3 |
HIP 20780 |
21.77 |
| 2026-10-10 12:00 |
04:25:54.60 |
+18:27:19.9 |
HIP 20780 |
22.35 |
| 2026-10-11 00:00 |
04:25:49.97 |
+18:27:01.3 |
HIP 20780 |
22.98 |