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 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
08:32:51.14 |
+43:41:10.1 |
HIP 41917 |
3.85 |
| 2026-09-20 12:00 |
08:32:54.39 |
+43:41:31.2 |
HIP 41917 |
4.38 |
| 2026-09-21 00:00 |
08:32:57.59 |
+43:41:52.6 |
HIP 41917 |
4.95 |
| 2026-09-21 12:00 |
08:33:00.73 |
+43:42:14.3 |
HIP 41917 |
5.55 |
| 2026-09-22 00:00 |
08:33:03.82 |
+43:42:36.4 |
HIP 41917 |
6.16 |
| 2026-09-22 12:00 |
08:33:06.85 |
+43:42:58.9 |
HIP 41917 |
6.78 |
| 2026-09-23 00:00 |
08:33:09.84 |
+43:43:21.7 |
HIP 41917 |
7.41 |
| 2026-09-23 12:00 |
08:33:12.76 |
+43:43:44.8 |
HIP 41917 |
8.04 |
| 2026-09-24 00:00 |
08:33:15.63 |
+43:44:08.3 |
HIP 41917 |
8.67 |
| 2026-09-24 12:00 |
08:33:18.45 |
+43:44:32.1 |
HIP 41917 |
9.30 |
| 2026-09-25 00:00 |
08:33:21.21 |
+43:44:56.2 |
HIP 41917 |
9.93 |
| 2026-09-25 12:00 |
08:33:23.92 |
+43:45:20.7 |
HIP 41917 |
10.56 |
| 2026-09-26 00:00 |
08:33:26.57 |
+43:45:45.5 |
HIP 41917 |
11.19 |
| 2026-09-26 12:00 |
08:33:29.16 |
+43:46:10.7 |
HIP 41917 |
11.82 |
| 2026-09-27 00:00 |
08:33:31.70 |
+43:46:36.2 |
HIP 41917 |
12.44 |
| 2026-09-27 12:00 |
08:33:34.18 |
+43:47:02.0 |
HIP 41917 |
13.06 |
| 2026-09-28 00:00 |
08:33:36.60 |
+43:47:28.2 |
HIP 41917 |
13.68 |
| 2026-09-28 12:00 |
08:33:38.96 |
+43:47:54.7 |
HIP 41917 |
14.29 |
| 2026-09-29 00:00 |
08:33:41.26 |
+43:48:21.5 |
HIP 41917 |
14.90 |
| 2026-09-29 12:00 |
08:33:43.51 |
+43:48:48.7 |
HIP 41917 |
15.51 |
| 2026-09-30 00:00 |
08:33:45.70 |
+43:49:16.2 |
HIP 41917 |
16.11 |
| 2026-09-30 12:00 |
08:33:47.82 |
+43:49:44.0 |
HIP 41917 |
16.71 |
| 2026-10-01 00:00 |
08:33:49.89 |
+43:50:12.2 |
HIP 41917 |
17.31 |
| 2026-10-01 12:00 |
08:33:51.90 |
+43:50:40.7 |
HIP 41917 |
17.91 |
| 2026-10-02 00:00 |
08:33:53.84 |
+43:51:09.5 |
HIP 41917 |
18.50 |
| 2026-10-02 12:00 |
08:33:55.73 |
+43:51:38.6 |
HIP 41917 |
19.08 |
| 2026-10-03 00:00 |
08:33:57.55 |
+43:52:08.1 |
HIP 41917 |
19.67 |
| 2026-10-03 12:00 |
08:33:59.32 |
+43:52:37.9 |
HIP 41917 |
20.25 |
| 2026-10-04 00:00 |
08:34:01.02 |
+43:53:08.0 |
HIP 41917 |
20.83 |
| 2026-10-04 12:00 |
08:34:02.65 |
+43:53:38.5 |
HIP 41917 |
21.41 |
| 2026-10-05 00:00 |
08:34:04.23 |
+43:54:09.3 |
HIP 41917 |
21.98 |
| 2026-10-05 12:00 |
08:34:05.74 |
+43:54:40.3 |
HIP 41917 |
22.55 |
| 2026-10-06 00:00 |
08:34:07.19 |
+43:55:11.8 |
HIP 41917 |
23.12 |
| 2026-10-06 12:00 |
08:34:08.57 |
+43:55:43.5 |
HIP 41917 |
23.68 |
| 2026-10-07 00:00 |
08:34:09.89 |
+43:56:15.5 |
HIP 41917 |
24.25 |
| 2026-10-07 12:00 |
08:34:11.14 |
+43:56:47.9 |
HIP 41917 |
24.81 |
| 2026-10-08 00:00 |
08:34:12.33 |
+43:57:20.6 |
HIP 41917 |
25.36 |
| 2026-10-08 12:00 |
08:34:13.45 |
+43:57:53.6 |
HIP 41917 |
25.92 |
| 2026-10-09 00:00 |
08:34:14.51 |
+43:58:26.9 |
HIP 41917 |
26.47 |
| 2026-10-09 12:00 |
08:34:15.50 |
+43:59:00.5 |
HIP 41917 |
27.03 |
| 2026-10-10 00:00 |
08:34:16.42 |
+43:59:34.4 |
HIP 41917 |
27.58 |
| 2026-10-10 12:00 |
08:34:17.28 |
+44:00:08.6 |
HIP 41917 |
28.13 |
| 2026-10-11 00:00 |
08:34:18.07 |
+44:00:43.1 |
HIP 41917 |
28.68 |