メタデータ
| 項目 |
値 |
| Designation |
C/2017 K1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-14T18:30:37.512000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:33Z |
| Obs used |
138 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-01.0000000 |
| e |
1.00209402 |
| q (au) |
7.285700 |
| a (au) |
-3479.295246 |
| i (deg) |
154.008296 |
| Ω (om, deg) |
225.641843 |
| ω (w, deg) |
4.202591 |
| M (ma, deg) |
0.000227 |
等級
散乱 + 全体線形
$$
M_a = (8.144 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.144 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.867 |
| k |
0.800 |
| 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 |
08:15:18.89 |
+45:59:17.0 |
HIP 40434 |
7.28 |
| 2026-03-26 12:00 |
08:15:12.69 |
+45:58:48.3 |
HIP 40434 |
7.94 |
| 2026-03-27 00:00 |
08:15:06.58 |
+45:58:19.2 |
HIP 40434 |
8.71 |
| 2026-03-27 12:00 |
08:15:00.55 |
+45:57:49.8 |
HIP 40434 |
9.56 |
| 2026-03-28 00:00 |
08:14:54.60 |
+45:57:20.2 |
HIP 40434 |
10.46 |
| 2026-03-28 12:00 |
08:14:48.73 |
+45:56:50.2 |
HIP 40434 |
11.41 |
| 2026-03-29 00:00 |
08:14:42.94 |
+45:56:19.9 |
HIP 40434 |
12.38 |
| 2026-03-29 12:00 |
08:14:37.24 |
+45:55:49.4 |
HIP 40434 |
13.37 |
| 2026-03-30 00:00 |
08:14:31.62 |
+45:55:18.5 |
HIP 40434 |
14.38 |
| 2026-03-30 12:00 |
08:14:26.07 |
+45:54:47.4 |
HIP 40434 |
15.39 |
| 2026-03-31 00:00 |
08:14:20.61 |
+45:54:16.0 |
HIP 40434 |
16.41 |
| 2026-03-31 12:00 |
08:14:15.24 |
+45:53:44.3 |
HIP 40434 |
17.43 |
| 2026-04-01 00:00 |
08:14:09.94 |
+45:53:12.4 |
HIP 40195 |
17.72 |
| 2026-04-01 12:00 |
08:14:04.73 |
+45:52:40.2 |
HIP 40195 |
17.14 |
| 2026-04-02 00:00 |
08:13:59.60 |
+45:52:07.7 |
HIP 40195 |
16.63 |
| 2026-04-02 12:00 |
08:13:54.55 |
+45:51:35.0 |
HIP 40195 |
16.18 |
| 2026-04-03 00:00 |
08:13:49.58 |
+45:51:02.0 |
HIP 40195 |
15.79 |
| 2026-04-03 12:00 |
08:13:44.70 |
+45:50:28.7 |
HIP 40195 |
15.48 |
| 2026-04-04 00:00 |
08:13:39.90 |
+45:49:55.2 |
HIP 40195 |
15.25 |
| 2026-04-04 12:00 |
08:13:35.18 |
+45:49:21.5 |
HIP 40195 |
15.09 |
| 2026-04-05 00:00 |
08:13:30.54 |
+45:48:47.5 |
HIP 40195 |
15.00 |
| 2026-04-05 12:00 |
08:13:25.99 |
+45:48:13.3 |
HIP 40195 |
15.00 |
| 2026-04-06 00:00 |
08:13:21.51 |
+45:47:38.8 |
HIP 40195 |
15.06 |
| 2026-04-06 12:00 |
08:13:17.12 |
+45:47:04.1 |
HIP 40195 |
15.20 |
| 2026-04-07 00:00 |
08:13:12.82 |
+45:46:29.2 |
HIP 40195 |
15.40 |
| 2026-04-07 12:00 |
08:13:08.59 |
+45:45:54.1 |
HIP 40195 |
15.67 |
| 2026-04-08 00:00 |
08:13:04.45 |
+45:45:18.7 |
HIP 40195 |
16.00 |
| 2026-04-08 12:00 |
08:13:00.39 |
+45:44:43.1 |
HIP 40195 |
16.38 |
| 2026-04-09 00:00 |
08:12:56.42 |
+45:44:07.4 |
HIP 40195 |
16.81 |
| 2026-04-09 12:00 |
08:12:52.52 |
+45:43:31.4 |
HIP 40195 |
17.28 |
| 2026-04-10 00:00 |
08:12:48.71 |
+45:42:55.1 |
HIP 40195 |
17.79 |
| 2026-04-10 12:00 |
08:12:44.98 |
+45:42:18.7 |
HIP 40195 |
18.33 |
| 2026-04-11 00:00 |
08:12:41.34 |
+45:41:42.1 |
HIP 40352 |
18.73 |
| 2026-04-11 12:00 |
08:12:37.77 |
+45:41:05.3 |
HIP 40119 |
18.55 |
| 2026-04-12 00:00 |
08:12:34.29 |
+45:40:28.3 |
HIP 40119 |
17.71 |
| 2026-04-12 12:00 |
08:12:30.90 |
+45:39:51.2 |
HIP 40119 |
16.87 |
| 2026-04-13 00:00 |
08:12:27.58 |
+45:39:13.8 |
HIP 40119 |
16.03 |
| 2026-04-13 12:00 |
08:12:24.35 |
+45:38:36.3 |
HIP 40119 |
15.20 |
| 2026-04-14 00:00 |
08:12:21.20 |
+45:37:58.5 |
HIP 40119 |
14.38 |
| 2026-04-14 12:00 |
08:12:18.13 |
+45:37:20.6 |
HIP 40119 |
13.57 |
| 2026-04-15 00:00 |
08:12:15.14 |
+45:36:42.6 |
HIP 40119 |
12.76 |
| 2026-04-15 12:00 |
08:12:12.24 |
+45:36:04.3 |
HIP 40119 |
11.96 |
| 2026-04-16 00:00 |
08:12:09.41 |
+45:35:26.0 |
HIP 40119 |
11.16 |