メタデータ
| 項目 |
値 |
| Designation |
C/2020 K4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-03-06T12:03:58.541760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:07Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
17.900 |
| K1 |
6.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-20T12:49:01.488000Z |
| Discovery magnitude (MPC) |
19.78 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) |
2020-06-16.0000000 |
| e |
0.96121938 |
| q (au) |
1.772742 |
| a (au) |
45.712051 |
| i (deg) |
125.914307 |
| Ω (om, deg) |
264.105134 |
| ω (w, deg) |
310.291834 |
| M (ma, deg) |
0.323677 |
等級
散乱 + 全体線形
$$
M_a = (17.090 + 2.376\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.090 |
| n |
2.376 |
| gf |
1.000 |
| gb |
-0.502 |
| 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) |
| 2026-07-29 00:00 |
12:46:36.29 |
+53:07:29.2 |
HIP 62244 |
11.00 |
| 2026-07-29 12:00 |
12:46:39.45 |
+53:06:08.3 |
HIP 62244 |
11.34 |
| 2026-07-30 00:00 |
12:46:42.68 |
+53:04:47.6 |
HIP 62244 |
11.87 |
| 2026-07-30 12:00 |
12:46:45.99 |
+53:03:27.0 |
HIP 62244 |
12.54 |
| 2026-07-31 00:00 |
12:46:49.37 |
+53:02:06.6 |
HIP 62405 |
11.37 |
| 2026-07-31 12:00 |
12:46:52.83 |
+53:00:46.4 |
HIP 62405 |
9.94 |
| 2026-08-01 00:00 |
12:46:56.35 |
+52:59:26.4 |
HIP 62405 |
8.51 |
| 2026-08-01 12:00 |
12:46:59.95 |
+52:58:06.6 |
HIP 62405 |
7.07 |
| 2026-08-02 00:00 |
12:47:03.62 |
+52:56:47.0 |
HIP 62405 |
5.64 |
| 2026-08-02 12:00 |
12:47:07.36 |
+52:55:27.6 |
HIP 62405 |
4.20 |
| 2026-08-03 00:00 |
12:47:11.18 |
+52:54:08.3 |
HIP 62405 |
2.76 |
| 2026-08-03 12:00 |
12:47:15.06 |
+52:52:49.4 |
HIP 62405 |
1.33 |
| 2026-08-04 00:00 |
12:47:19.01 |
+52:51:30.6 |
HIP 62405 |
0.24 |
| 2026-08-04 12:00 |
12:47:23.03 |
+52:50:12.0 |
HIP 62405 |
1.58 |
| 2026-08-05 00:00 |
12:47:27.12 |
+52:48:53.7 |
HIP 62405 |
3.02 |
| 2026-08-05 12:00 |
12:47:31.28 |
+52:47:35.6 |
HIP 62405 |
4.46 |
| 2026-08-06 00:00 |
12:47:35.51 |
+52:46:17.7 |
HIP 62405 |
5.91 |
| 2026-08-06 12:00 |
12:47:39.81 |
+52:45:00.1 |
HIP 62405 |
7.35 |
| 2026-08-07 00:00 |
12:47:44.17 |
+52:43:42.7 |
HIP 62405 |
8.80 |
| 2026-08-07 12:00 |
12:47:48.60 |
+52:42:25.6 |
HIP 62405 |
10.25 |
| 2026-08-08 00:00 |
12:47:53.10 |
+52:41:08.7 |
HIP 62405 |
11.70 |
| 2026-08-08 12:00 |
12:47:57.66 |
+52:39:52.1 |
HIP 62476 |
12.90 |
| 2026-08-09 00:00 |
12:48:02.29 |
+52:38:35.7 |
HIP 62476 |
11.53 |
| 2026-08-09 12:00 |
12:48:06.99 |
+52:37:19.7 |
HIP 62476 |
10.18 |
| 2026-08-10 00:00 |
12:48:11.75 |
+52:36:03.9 |
HIP 62476 |
8.88 |
| 2026-08-10 12:00 |
12:48:16.57 |
+52:34:48.3 |
HIP 62476 |
7.63 |
| 2026-08-11 00:00 |
12:48:21.46 |
+52:33:33.1 |
HIP 62476 |
6.48 |
| 2026-08-11 12:00 |
12:48:26.41 |
+52:32:18.2 |
HIP 62476 |
5.48 |
| 2026-08-12 00:00 |
12:48:31.42 |
+52:31:03.5 |
HIP 62476 |
4.74 |
| 2026-08-12 12:00 |
12:48:36.50 |
+52:29:49.2 |
HIP 62476 |
4.39 |
| 2026-08-13 00:00 |
12:48:41.64 |
+52:28:35.1 |
HIP 62476 |
4.52 |
| 2026-08-13 12:00 |
12:48:46.84 |
+52:27:21.4 |
HIP 62476 |
5.10 |
| 2026-08-14 00:00 |
12:48:52.10 |
+52:26:08.0 |
HIP 62476 |
5.99 |
| 2026-08-14 12:00 |
12:48:57.42 |
+52:24:54.9 |
HIP 62476 |
7.09 |
| 2026-08-15 00:00 |
12:49:02.81 |
+52:23:42.1 |
HIP 62476 |
8.30 |
| 2026-08-15 12:00 |
12:49:08.25 |
+52:22:29.7 |
HIP 62476 |
9.59 |
| 2026-08-16 00:00 |
12:49:13.75 |
+52:21:17.6 |
HIP 62476 |
10.93 |
| 2026-08-16 12:00 |
12:49:19.30 |
+52:20:05.9 |
HIP 62476 |
12.31 |
| 2026-08-17 00:00 |
12:49:24.92 |
+52:18:54.5 |
HIP 62476 |
13.70 |
| 2026-08-17 12:00 |
12:49:30.59 |
+52:17:43.4 |
HIP 62476 |
15.12 |
| 2026-08-18 00:00 |
12:49:36.32 |
+52:16:32.7 |
HIP 62476 |
16.54 |
| 2026-08-18 12:00 |
12:49:42.11 |
+52:15:22.3 |
HIP 62476 |
17.98 |
| 2026-08-19 00:00 |
12:49:47.95 |
+52:14:12.4 |
HIP 62476 |
19.42 |