メタデータ
| 項目 |
値 |
| Designation |
C/2018 K1 (Weiland) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-04-06T21:34:06.764160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:43Z |
| Obs used |
163 |
| NEO |
- |
| M1 |
12.500 |
| K1 |
14.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-05-25T13:00:23.616000Z |
| Discovery magnitude (MPC) |
17.30 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-06-04.0000000 |
| e |
0.93721411 |
| q (au) |
1.879169 |
| a (au) |
29.929796 |
| i (deg) |
164.192707 |
| Ω (om, deg) |
260.001799 |
| ω (w, deg) |
325.002910 |
| M (ma, deg) |
0.349731 |
等級
散乱 + 全体線形
$$
M_a = (12.352 + 5.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.352 |
| n |
5.304 |
| gf |
1.000 |
| gb |
-0.785 |
| k |
0.997 |
| 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 |
10:10:32.67 |
+25:52:23.6 |
HIP 49719 |
29.10 |
| 2026-09-20 12:00 |
10:10:37.34 |
+25:52:09.9 |
HIP 49719 |
29.67 |
| 2026-09-21 00:00 |
10:10:41.99 |
+25:51:56.5 |
HIP 49719 |
30.26 |
| 2026-09-21 12:00 |
10:10:46.61 |
+25:51:43.3 |
HIP 49719 |
30.87 |
| 2026-09-22 00:00 |
10:10:51.22 |
+25:51:30.5 |
HIP 49719 |
31.51 |
| 2026-09-22 12:00 |
10:10:55.80 |
+25:51:17.9 |
HIP 49719 |
32.17 |
| 2026-09-23 00:00 |
10:11:00.36 |
+25:51:05.6 |
HIP 49719 |
32.85 |
| 2026-09-23 12:00 |
10:11:04.89 |
+25:50:53.5 |
HIP 49719 |
33.55 |
| 2026-09-24 00:00 |
10:11:09.40 |
+25:50:41.7 |
HIP 49719 |
34.26 |
| 2026-09-24 12:00 |
10:11:13.88 |
+25:50:30.2 |
HIP 49719 |
34.99 |
| 2026-09-25 00:00 |
10:11:18.34 |
+25:50:19.0 |
HIP 49719 |
35.73 |
| 2026-09-25 12:00 |
10:11:22.78 |
+25:50:08.1 |
HIP 49719 |
36.48 |
| 2026-09-26 00:00 |
10:11:27.19 |
+25:49:57.4 |
HIP 50093 |
35.84 |
| 2026-09-26 12:00 |
10:11:31.57 |
+25:49:47.0 |
HIP 50093 |
35.11 |
| 2026-09-27 00:00 |
10:11:35.93 |
+25:49:36.9 |
HIP 50093 |
34.39 |
| 2026-09-27 12:00 |
10:11:40.26 |
+25:49:27.1 |
HIP 50093 |
33.68 |
| 2026-09-28 00:00 |
10:11:44.56 |
+25:49:17.5 |
HIP 50093 |
33.00 |
| 2026-09-28 12:00 |
10:11:48.84 |
+25:49:08.3 |
HIP 50093 |
32.33 |
| 2026-09-29 00:00 |
10:11:53.09 |
+25:48:59.3 |
HIP 50093 |
31.67 |
| 2026-09-29 12:00 |
10:11:57.31 |
+25:48:50.6 |
HIP 50093 |
31.04 |
| 2026-09-30 00:00 |
10:12:01.51 |
+25:48:42.2 |
HIP 50093 |
30.42 |
| 2026-09-30 12:00 |
10:12:05.67 |
+25:48:34.1 |
HIP 50093 |
29.83 |
| 2026-10-01 00:00 |
10:12:09.81 |
+25:48:26.3 |
HIP 50093 |
29.25 |
| 2026-10-01 12:00 |
10:12:13.92 |
+25:48:18.7 |
HIP 50093 |
28.69 |
| 2026-10-02 00:00 |
10:12:18.00 |
+25:48:11.5 |
HIP 50093 |
28.15 |
| 2026-10-02 12:00 |
10:12:22.04 |
+25:48:04.5 |
HIP 50093 |
27.64 |
| 2026-10-03 00:00 |
10:12:26.06 |
+25:47:57.9 |
HIP 50093 |
27.14 |
| 2026-10-03 12:00 |
10:12:30.05 |
+25:47:51.5 |
HIP 50093 |
26.67 |
| 2026-10-04 00:00 |
10:12:34.01 |
+25:47:45.5 |
HIP 50093 |
26.22 |
| 2026-10-04 12:00 |
10:12:37.94 |
+25:47:39.7 |
HIP 50093 |
25.80 |
| 2026-10-05 00:00 |
10:12:41.83 |
+25:47:34.3 |
HIP 50093 |
25.39 |
| 2026-10-05 12:00 |
10:12:45.69 |
+25:47:29.1 |
HIP 50093 |
25.01 |
| 2026-10-06 00:00 |
10:12:49.53 |
+25:47:24.3 |
HIP 50093 |
24.66 |
| 2026-10-06 12:00 |
10:12:53.32 |
+25:47:19.7 |
HIP 50093 |
24.33 |
| 2026-10-07 00:00 |
10:12:57.09 |
+25:47:15.5 |
HIP 50093 |
24.02 |
| 2026-10-07 12:00 |
10:13:00.82 |
+25:47:11.6 |
HIP 50093 |
23.74 |
| 2026-10-08 00:00 |
10:13:04.52 |
+25:47:08.0 |
HIP 50093 |
23.48 |
| 2026-10-08 12:00 |
10:13:08.19 |
+25:47:04.6 |
HIP 50093 |
23.25 |
| 2026-10-09 00:00 |
10:13:11.82 |
+25:47:01.6 |
HIP 50093 |
23.04 |
| 2026-10-09 12:00 |
10:13:15.41 |
+25:46:58.9 |
HIP 50093 |
22.86 |
| 2026-10-10 00:00 |
10:13:18.97 |
+25:46:56.6 |
HIP 50093 |
22.70 |
| 2026-10-10 12:00 |
10:13:22.50 |
+25:46:54.5 |
HIP 50093 |
22.57 |
| 2026-10-11 00:00 |
10:13:25.99 |
+25:46:52.8 |
HIP 50093 |
22.45 |