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 |
0.998 |
| 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) |
| 2026-03-26 00:00 |
03:33:58.45 |
+16:24:52.9 |
HIP 16538 |
18.30 |
| 2026-03-26 12:00 |
03:34:07.87 |
+16:25:30.3 |
HIP 16538 |
19.81 |
| 2026-03-27 00:00 |
03:34:17.35 |
+16:26:07.9 |
HIP 16538 |
21.49 |
| 2026-03-27 12:00 |
03:34:26.88 |
+16:26:45.6 |
HIP 16788 |
23.17 |
| 2026-03-28 00:00 |
03:34:36.47 |
+16:27:23.4 |
HIP 16788 |
20.84 |
| 2026-03-28 12:00 |
03:34:46.12 |
+16:28:01.4 |
HIP 16788 |
18.52 |
| 2026-03-29 00:00 |
03:34:55.82 |
+16:28:39.4 |
HIP 16788 |
16.20 |
| 2026-03-29 12:00 |
03:35:05.58 |
+16:29:17.6 |
HIP 16788 |
13.90 |
| 2026-03-30 00:00 |
03:35:15.39 |
+16:29:55.8 |
HIP 16788 |
11.65 |
| 2026-03-30 12:00 |
03:35:25.25 |
+16:30:34.2 |
HIP 16788 |
9.47 |
| 2026-03-31 00:00 |
03:35:35.17 |
+16:31:12.7 |
HIP 16788 |
7.44 |
| 2026-03-31 12:00 |
03:35:45.14 |
+16:31:51.3 |
HIP 16788 |
5.77 |
| 2026-04-01 00:00 |
03:35:55.16 |
+16:32:29.9 |
HIP 16788 |
4.83 |
| 2026-04-01 12:00 |
03:36:05.24 |
+16:33:08.7 |
HIP 16788 |
5.08 |
| 2026-04-02 00:00 |
03:36:15.36 |
+16:33:47.6 |
HIP 16788 |
6.39 |
| 2026-04-02 12:00 |
03:36:25.54 |
+16:34:26.5 |
HIP 16831 |
6.39 |
| 2026-04-03 00:00 |
03:36:35.77 |
+16:35:05.5 |
HIP 16831 |
5.72 |
| 2026-04-03 12:00 |
03:36:46.05 |
+16:35:44.7 |
HIP 16831 |
6.13 |
| 2026-04-04 00:00 |
03:36:56.37 |
+16:36:23.9 |
HIP 16831 |
7.45 |
| 2026-04-04 12:00 |
03:37:06.75 |
+16:37:03.2 |
HIP 16831 |
9.31 |
| 2026-04-05 00:00 |
03:37:17.18 |
+16:37:42.5 |
HIP 16831 |
11.46 |
| 2026-04-05 12:00 |
03:37:27.65 |
+16:38:22.0 |
HIP 16831 |
13.77 |
| 2026-04-06 00:00 |
03:37:38.17 |
+16:39:01.5 |
HIP 16831 |
16.18 |
| 2026-04-06 12:00 |
03:37:48.74 |
+16:39:41.1 |
HIP 16831 |
18.65 |
| 2026-04-07 00:00 |
03:37:59.35 |
+16:40:20.8 |
HIP 16831 |
21.17 |
| 2026-04-07 12:00 |
03:38:10.01 |
+16:41:00.5 |
HIP 17058 |
20.16 |
| 2026-04-08 00:00 |
03:38:20.72 |
+16:41:40.3 |
HIP 17058 |
18.22 |
| 2026-04-08 12:00 |
03:38:31.47 |
+16:42:20.2 |
HIP 17058 |
16.48 |
| 2026-04-09 00:00 |
03:38:42.27 |
+16:43:00.1 |
HIP 17058 |
15.00 |
| 2026-04-09 12:00 |
03:38:53.11 |
+16:43:40.1 |
HIP 17058 |
13.87 |
| 2026-04-10 00:00 |
03:39:03.99 |
+16:44:20.1 |
HIP 17058 |
13.20 |
| 2026-04-10 12:00 |
03:39:14.92 |
+16:45:00.2 |
HIP 17058 |
13.06 |
| 2026-04-11 00:00 |
03:39:25.89 |
+16:45:40.3 |
HIP 17058 |
13.47 |
| 2026-04-11 12:00 |
03:39:36.90 |
+16:46:20.5 |
HIP 17058 |
14.39 |
| 2026-04-12 00:00 |
03:39:47.96 |
+16:47:00.8 |
HIP 17058 |
15.73 |
| 2026-04-12 12:00 |
03:39:59.05 |
+16:47:41.0 |
HIP 17058 |
17.41 |
| 2026-04-13 00:00 |
03:40:10.19 |
+16:48:21.4 |
HIP 17058 |
19.34 |
| 2026-04-13 12:00 |
03:40:21.37 |
+16:49:01.7 |
HIP 17058 |
21.46 |
| 2026-04-14 00:00 |
03:40:32.58 |
+16:49:42.1 |
HIP 17058 |
23.72 |
| 2026-04-14 12:00 |
03:40:43.84 |
+16:50:22.6 |
HIP 17291 |
20.96 |
| 2026-04-15 00:00 |
03:40:55.13 |
+16:51:03.0 |
HIP 17291 |
18.19 |
| 2026-04-15 12:00 |
03:41:06.47 |
+16:51:43.5 |
HIP 17291 |
15.42 |
| 2026-04-16 00:00 |
03:41:17.84 |
+16:52:24.0 |
HIP 17291 |
12.64 |