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) |
| 2026-06-01 00:00 |
08:13:06.12 |
+44:32:29.9 |
HIP 40332 |
15.25 |
| 2026-06-01 12:00 |
08:13:09.67 |
+44:31:50.4 |
HIP 40332 |
15.30 |
| 2026-06-02 00:00 |
08:13:13.28 |
+44:31:11.1 |
HIP 40332 |
15.41 |
| 2026-06-02 12:00 |
08:13:16.94 |
+44:30:31.8 |
HIP 40332 |
15.56 |
| 2026-06-03 00:00 |
08:13:20.64 |
+44:29:52.7 |
HIP 40332 |
15.76 |
| 2026-06-03 12:00 |
08:13:24.40 |
+44:29:13.7 |
HIP 40332 |
16.00 |
| 2026-06-04 00:00 |
08:13:28.21 |
+44:28:34.9 |
HIP 40332 |
16.29 |
| 2026-06-04 12:00 |
08:13:32.06 |
+44:27:56.1 |
HIP 40332 |
16.62 |
| 2026-06-05 00:00 |
08:13:35.96 |
+44:27:17.5 |
HIP 40332 |
16.99 |
| 2026-06-05 12:00 |
08:13:39.91 |
+44:26:39.0 |
HIP 40332 |
17.40 |
| 2026-06-06 00:00 |
08:13:43.90 |
+44:26:00.6 |
HIP 40332 |
17.85 |
| 2026-06-06 12:00 |
08:13:47.95 |
+44:25:22.4 |
HIP 40332 |
18.33 |
| 2026-06-07 00:00 |
08:13:52.03 |
+44:24:44.3 |
HIP 40332 |
18.85 |
| 2026-06-07 12:00 |
08:13:56.17 |
+44:24:06.3 |
HIP 40332 |
19.39 |
| 2026-06-08 00:00 |
08:14:00.35 |
+44:23:28.5 |
HIP 40332 |
19.97 |
| 2026-06-08 12:00 |
08:14:04.57 |
+44:22:50.8 |
HIP 40332 |
20.58 |
| 2026-06-09 00:00 |
08:14:08.84 |
+44:22:13.3 |
HIP 40481 |
20.12 |
| 2026-06-09 12:00 |
08:14:13.16 |
+44:21:35.8 |
HIP 40481 |
19.21 |
| 2026-06-10 00:00 |
08:14:17.51 |
+44:20:58.6 |
HIP 40481 |
18.30 |
| 2026-06-10 12:00 |
08:14:21.91 |
+44:20:21.4 |
HIP 40481 |
17.40 |
| 2026-06-11 00:00 |
08:14:26.36 |
+44:19:44.5 |
HIP 40481 |
16.50 |
| 2026-06-11 12:00 |
08:14:30.84 |
+44:19:07.7 |
HIP 40481 |
15.60 |
| 2026-06-12 00:00 |
08:14:35.37 |
+44:18:31.0 |
HIP 40481 |
14.71 |
| 2026-06-12 12:00 |
08:14:39.94 |
+44:17:54.5 |
HIP 40481 |
13.84 |
| 2026-06-13 00:00 |
08:14:44.55 |
+44:17:18.1 |
HIP 40481 |
12.97 |
| 2026-06-13 12:00 |
08:14:49.20 |
+44:16:41.9 |
HIP 40481 |
12.12 |
| 2026-06-14 00:00 |
08:14:53.89 |
+44:16:05.9 |
HIP 40481 |
11.30 |
| 2026-06-14 12:00 |
08:14:58.62 |
+44:15:30.0 |
HIP 40481 |
10.50 |
| 2026-06-15 00:00 |
08:15:03.39 |
+44:14:54.3 |
HIP 40481 |
9.74 |
| 2026-06-15 12:00 |
08:15:08.19 |
+44:14:18.7 |
HIP 40481 |
9.03 |
| 2026-06-16 00:00 |
08:15:13.04 |
+44:13:43.4 |
HIP 40481 |
8.38 |
| 2026-06-16 12:00 |
08:15:17.92 |
+44:13:08.2 |
HIP 40481 |
7.81 |
| 2026-06-17 00:00 |
08:15:22.84 |
+44:12:33.1 |
HIP 40481 |
7.35 |
| 2026-06-17 12:00 |
08:15:27.80 |
+44:11:58.3 |
HIP 40481 |
7.00 |
| 2026-06-18 00:00 |
08:15:32.79 |
+44:11:23.6 |
HIP 40481 |
6.80 |
| 2026-06-18 12:00 |
08:15:37.82 |
+44:10:49.1 |
HIP 40481 |
6.75 |
| 2026-06-19 00:00 |
08:15:42.88 |
+44:10:14.8 |
HIP 40481 |
6.87 |
| 2026-06-19 12:00 |
08:15:47.97 |
+44:09:40.7 |
HIP 40481 |
7.14 |
| 2026-06-20 00:00 |
08:15:53.10 |
+44:09:06.8 |
HIP 40481 |
7.56 |
| 2026-06-20 12:00 |
08:15:58.27 |
+44:08:33.0 |
HIP 40481 |
8.09 |
| 2026-06-21 00:00 |
08:16:03.46 |
+44:07:59.4 |
HIP 40481 |
8.73 |
| 2026-06-21 12:00 |
08:16:08.69 |
+44:07:26.1 |
HIP 40481 |
9.44 |
| 2026-06-22 00:00 |
08:16:13.95 |
+44:06:52.9 |
HIP 40481 |
10.22 |