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) |
| 2026-09-20 00:00 |
12:57:34.10 |
+51:14:55.9 |
HIP 63164 |
14.11 |
| 2026-09-20 12:00 |
12:57:42.46 |
+51:14:17.3 |
HIP 63164 |
14.62 |
| 2026-09-21 00:00 |
12:57:50.84 |
+51:13:39.3 |
HIP 63164 |
15.27 |
| 2026-09-21 12:00 |
12:57:59.24 |
+51:13:01.9 |
HIP 63164 |
16.04 |
| 2026-09-22 00:00 |
12:58:07.66 |
+51:12:25.1 |
HIP 63164 |
16.90 |
| 2026-09-22 12:00 |
12:58:16.10 |
+51:11:48.9 |
HIP 63164 |
17.85 |
| 2026-09-23 00:00 |
12:58:24.56 |
+51:11:13.3 |
HIP 63164 |
18.87 |
| 2026-09-23 12:00 |
12:58:33.04 |
+51:10:38.4 |
HIP 63164 |
19.95 |
| 2026-09-24 00:00 |
12:58:41.54 |
+51:10:04.0 |
HIP 63164 |
21.08 |
| 2026-09-24 12:00 |
12:58:50.05 |
+51:09:30.2 |
HIP 63164 |
22.25 |
| 2026-09-25 00:00 |
12:58:58.58 |
+51:08:57.1 |
HIP 63498 |
22.18 |
| 2026-09-25 12:00 |
12:59:07.13 |
+51:08:24.5 |
HIP 63498 |
21.65 |
| 2026-09-26 00:00 |
12:59:15.69 |
+51:07:52.6 |
HIP 63498 |
21.18 |
| 2026-09-26 12:00 |
12:59:24.27 |
+51:07:21.3 |
HIP 63498 |
20.80 |
| 2026-09-27 00:00 |
12:59:32.86 |
+51:06:50.6 |
HIP 63498 |
20.51 |
| 2026-09-27 12:00 |
12:59:41.47 |
+51:06:20.5 |
HIP 63498 |
20.30 |
| 2026-09-28 00:00 |
12:59:50.09 |
+51:05:51.1 |
HIP 63498 |
20.17 |
| 2026-09-28 12:00 |
12:59:58.72 |
+51:05:22.3 |
HIP 63498 |
20.15 |
| 2026-09-29 00:00 |
13:00:07.37 |
+51:04:54.1 |
HIP 63498 |
20.21 |
| 2026-09-29 12:00 |
13:00:16.03 |
+51:04:26.5 |
HIP 63498 |
20.36 |
| 2026-09-30 00:00 |
13:00:24.70 |
+51:03:59.6 |
HIP 63498 |
20.60 |
| 2026-09-30 12:00 |
13:00:33.39 |
+51:03:33.3 |
HIP 63498 |
20.92 |
| 2026-10-01 00:00 |
13:00:42.08 |
+51:03:07.7 |
HIP 63666 |
20.76 |
| 2026-10-01 12:00 |
13:00:50.79 |
+51:02:42.7 |
HIP 63666 |
19.38 |
| 2026-10-02 00:00 |
13:00:59.50 |
+51:02:18.4 |
HIP 63666 |
18.01 |
| 2026-10-02 12:00 |
13:01:08.23 |
+51:01:54.7 |
HIP 63666 |
16.64 |
| 2026-10-03 00:00 |
13:01:16.96 |
+51:01:31.6 |
HIP 63666 |
15.29 |
| 2026-10-03 12:00 |
13:01:25.70 |
+51:01:09.2 |
HIP 63666 |
13.94 |
| 2026-10-04 00:00 |
13:01:34.45 |
+51:00:47.4 |
HIP 63666 |
12.61 |
| 2026-10-04 12:00 |
13:01:43.21 |
+51:00:26.3 |
HIP 63666 |
11.30 |
| 2026-10-05 00:00 |
13:01:51.97 |
+51:00:05.9 |
HIP 63666 |
10.02 |
| 2026-10-05 12:00 |
13:02:00.74 |
+50:59:46.2 |
HIP 63666 |
8.77 |
| 2026-10-06 00:00 |
13:02:09.52 |
+50:59:27.0 |
HIP 63666 |
7.58 |
| 2026-10-06 12:00 |
13:02:18.30 |
+50:59:08.6 |
HIP 63666 |
6.47 |
| 2026-10-07 00:00 |
13:02:27.09 |
+50:58:50.9 |
HIP 63666 |
5.50 |
| 2026-10-07 12:00 |
13:02:35.87 |
+50:58:33.8 |
HIP 63666 |
4.74 |
| 2026-10-08 00:00 |
13:02:44.67 |
+50:58:17.3 |
HIP 63666 |
4.32 |
| 2026-10-08 12:00 |
13:02:53.46 |
+50:58:01.6 |
HIP 63666 |
4.32 |
| 2026-10-09 00:00 |
13:03:02.26 |
+50:57:46.6 |
HIP 63666 |
4.75 |
| 2026-10-09 12:00 |
13:03:11.06 |
+50:57:32.2 |
HIP 63666 |
5.51 |
| 2026-10-10 00:00 |
13:03:19.86 |
+50:57:18.5 |
HIP 63666 |
6.47 |
| 2026-10-10 12:00 |
13:03:28.66 |
+50:57:05.5 |
HIP 63666 |
7.57 |
| 2026-10-11 00:00 |
13:03:37.46 |
+50:56:53.2 |
HIP 63666 |
8.75 |