メタデータ
| 項目 |
値 |
| Designation |
C/2020 K7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-10-28T18:33:30.147840Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:34Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-30T13:09:12.211200Z |
| Discovery magnitude (MPC) |
20.21 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) |
2020-09-01.0000000 |
| e |
0.94160673 |
| q (au) |
6.383959 |
| a (au) |
109.326969 |
| i (deg) |
32.066780 |
| Ω (om, deg) |
286.109728 |
| ω (w, deg) |
358.125971 |
| M (ma, deg) |
0.265756 |
等級
散乱 + 全体線形
$$
M_a = (10.874 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.874 |
| n |
2.000 |
| gf |
0.953 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.377 |
| 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 |
00:57:04.61 |
+38:39:40.0 |
HIP 4436 |
10.43 |
| 2026-05-12 12:00 |
00:57:13.65 |
+38:40:51.8 |
HIP 4436 |
12.25 |
| 2026-05-13 00:00 |
00:57:22.65 |
+38:42:03.8 |
HIP 4436 |
14.16 |
| 2026-05-13 12:00 |
00:57:31.62 |
+38:43:16.0 |
HIP 4436 |
16.12 |
| 2026-05-14 00:00 |
00:57:40.54 |
+38:44:28.5 |
HIP 4436 |
18.11 |
| 2026-05-14 12:00 |
00:57:49.43 |
+38:45:41.0 |
HIP 4605 |
17.49 |
| 2026-05-15 00:00 |
00:57:58.28 |
+38:46:53.8 |
HIP 4605 |
15.38 |
| 2026-05-15 12:00 |
00:58:07.09 |
+38:48:06.8 |
HIP 4605 |
13.28 |
| 2026-05-16 00:00 |
00:58:15.86 |
+38:49:19.9 |
HIP 4605 |
11.18 |
| 2026-05-16 12:00 |
00:58:24.59 |
+38:50:33.2 |
HIP 4605 |
9.09 |
| 2026-05-17 00:00 |
00:58:33.28 |
+38:51:46.6 |
HIP 4605 |
7.00 |
| 2026-05-17 12:00 |
00:58:41.92 |
+38:53:00.2 |
HIP 4605 |
4.92 |
| 2026-05-18 00:00 |
00:58:50.53 |
+38:54:14.0 |
HIP 4605 |
2.84 |
| 2026-05-18 12:00 |
00:58:59.09 |
+38:55:27.9 |
HIP 4605 |
0.78 |
| 2026-05-19 00:00 |
00:59:07.61 |
+38:56:41.9 |
HIP 4605 |
1.30 |
| 2026-05-19 12:00 |
00:59:16.08 |
+38:57:56.1 |
HIP 4605 |
3.36 |
| 2026-05-20 00:00 |
00:59:24.51 |
+38:59:10.5 |
HIP 4605 |
5.41 |
| 2026-05-20 12:00 |
00:59:32.90 |
+39:00:25.0 |
HIP 4605 |
7.46 |
| 2026-05-21 00:00 |
00:59:41.25 |
+39:01:39.6 |
HIP 4605 |
9.50 |
| 2026-05-21 12:00 |
00:59:49.54 |
+39:02:54.4 |
HIP 4605 |
11.54 |
| 2026-05-22 00:00 |
00:59:57.80 |
+39:04:09.2 |
HIP 4605 |
13.57 |
| 2026-05-22 12:00 |
01:00:06.01 |
+39:05:24.2 |
HIP 4605 |
15.59 |
| 2026-05-23 00:00 |
01:00:14.17 |
+39:06:39.3 |
HIP 4605 |
17.61 |
| 2026-05-23 12:00 |
01:00:22.28 |
+39:07:54.6 |
HIP 4605 |
19.62 |
| 2026-05-24 00:00 |
01:00:30.35 |
+39:09:09.9 |
HIP 4605 |
21.63 |
| 2026-05-24 12:00 |
01:00:38.37 |
+39:10:25.4 |
HIP 4605 |
23.63 |
| 2026-05-25 00:00 |
01:00:46.35 |
+39:11:40.9 |
HIP 4605 |
25.62 |
| 2026-05-25 12:00 |
01:00:54.27 |
+39:12:56.6 |
HIP 4863 |
24.49 |
| 2026-05-26 00:00 |
01:01:02.15 |
+39:14:12.3 |
HIP 4863 |
22.50 |
| 2026-05-26 12:00 |
01:01:09.98 |
+39:15:28.2 |
HIP 4863 |
20.53 |
| 2026-05-27 00:00 |
01:01:17.76 |
+39:16:44.1 |
HIP 4863 |
18.56 |
| 2026-05-27 12:00 |
01:01:25.50 |
+39:18:00.2 |
HIP 4863 |
16.60 |
| 2026-05-28 00:00 |
01:01:33.18 |
+39:19:16.3 |
HIP 4863 |
14.65 |
| 2026-05-28 12:00 |
01:01:40.81 |
+39:20:32.5 |
HIP 4863 |
12.70 |
| 2026-05-29 00:00 |
01:01:48.40 |
+39:21:48.8 |
HIP 4863 |
10.76 |
| 2026-05-29 12:00 |
01:01:55.93 |
+39:23:05.1 |
HIP 4863 |
8.83 |
| 2026-05-30 00:00 |
01:02:03.41 |
+39:24:21.6 |
HIP 4863 |
6.91 |
| 2026-05-30 12:00 |
01:02:10.84 |
+39:25:38.1 |
HIP 4863 |
5.00 |
| 2026-05-31 00:00 |
01:02:18.22 |
+39:26:54.6 |
HIP 4863 |
3.10 |
| 2026-05-31 12:00 |
01:02:25.55 |
+39:28:11.3 |
HIP 4863 |
1.28 |
| 2026-06-01 00:00 |
01:02:32.83 |
+39:29:28.0 |
HIP 4863 |
0.95 |
| 2026-06-01 12:00 |
01:02:40.05 |
+39:30:44.7 |
HIP 4863 |
2.71 |
| 2026-06-02 00:00 |
01:02:47.22 |
+39:32:01.5 |
HIP 4863 |
4.57 |