C/2018 K1 (Weiland)
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) |
| 2026-02-03 00:00 |
10:14:01.21 |
+27:10:20.9 |
HIP 50109 |
3.37 |
| 2026-02-03 12:00 |
10:13:53.72 |
+27:11:04.9 |
HIP 50109 |
3.06 |
| 2026-02-04 00:00 |
10:13:46.20 |
+27:11:48.7 |
HIP 50109 |
3.75 |
| 2026-02-04 12:00 |
10:13:38.66 |
+27:12:32.4 |
HIP 50109 |
5.03 |
| 2026-02-05 00:00 |
10:13:31.11 |
+27:13:15.8 |
HIP 50109 |
6.58 |
| 2026-02-05 12:00 |
10:13:23.53 |
+27:13:59.1 |
HIP 50109 |
8.24 |
| 2026-02-06 00:00 |
10:13:15.94 |
+27:14:42.2 |
HIP 50109 |
9.97 |
| 2026-02-06 12:00 |
10:13:08.34 |
+27:15:25.1 |
HIP 50052 |
9.78 |
| 2026-02-07 00:00 |
10:13:00.71 |
+27:16:07.8 |
HIP 50052 |
9.25 |
| 2026-02-07 12:00 |
10:12:53.08 |
+27:16:50.3 |
HIP 50052 |
9.07 |
| 2026-02-08 00:00 |
10:12:45.42 |
+27:17:32.6 |
HIP 50052 |
9.26 |
| 2026-02-08 12:00 |
10:12:37.76 |
+27:18:14.7 |
HIP 50052 |
9.80 |
| 2026-02-09 00:00 |
10:12:30.08 |
+27:18:56.6 |
HIP 50052 |
10.65 |
| 2026-02-09 12:00 |
10:12:22.38 |
+27:19:38.2 |
HIP 50052 |
11.73 |
| 2026-02-10 00:00 |
10:12:14.68 |
+27:20:19.7 |
HIP 50052 |
12.98 |
| 2026-02-10 12:00 |
10:12:06.96 |
+27:21:00.9 |
HIP 50052 |
14.37 |
| 2026-02-11 00:00 |
10:11:59.23 |
+27:21:41.9 |
HIP 50052 |
15.86 |
| 2026-02-11 12:00 |
10:11:51.50 |
+27:22:22.7 |
HIP 49993 |
17.37 |
| 2026-02-12 00:00 |
10:11:43.75 |
+27:23:03.3 |
HIP 49993 |
18.68 |
| 2026-02-12 12:00 |
10:11:35.99 |
+27:23:43.6 |
HIP 49993 |
20.08 |
| 2026-02-13 00:00 |
10:11:28.23 |
+27:24:23.7 |
HIP 49993 |
21.54 |
| 2026-02-13 12:00 |
10:11:20.46 |
+27:25:03.5 |
HIP 49993 |
23.05 |
| 2026-02-14 00:00 |
10:11:12.68 |
+27:25:43.1 |
HIP 49993 |
24.61 |
| 2026-02-14 12:00 |
10:11:04.89 |
+27:26:22.4 |
HIP 49924 |
25.11 |
| 2026-02-15 00:00 |
10:10:57.10 |
+27:27:01.5 |
HIP 49924 |
25.01 |
| 2026-02-15 12:00 |
10:10:49.31 |
+27:27:40.4 |
HIP 49924 |
25.05 |
| 2026-02-16 00:00 |
10:10:41.51 |
+27:28:18.9 |
HIP 49924 |
25.23 |
| 2026-02-16 12:00 |
10:10:33.71 |
+27:28:57.2 |
HIP 49924 |
25.55 |
| 2026-02-17 00:00 |
10:10:25.90 |
+27:29:35.3 |
HIP 49924 |
25.99 |
| 2026-02-17 12:00 |
10:10:18.09 |
+27:30:13.0 |
HIP 49924 |
26.56 |
| 2026-02-18 00:00 |
10:10:10.28 |
+27:30:50.5 |
HIP 49924 |
27.25 |
| 2026-02-18 12:00 |
10:10:02.47 |
+27:31:27.8 |
HIP 49924 |
28.04 |
| 2026-02-19 00:00 |
10:09:54.66 |
+27:32:04.7 |
HIP 49759 |
27.63 |
| 2026-02-19 12:00 |
10:09:46.86 |
+27:32:41.4 |
HIP 49759 |
26.68 |
| 2026-02-20 00:00 |
10:09:39.05 |
+27:33:17.7 |
HIP 49759 |
25.83 |
| 2026-02-20 12:00 |
10:09:31.24 |
+27:33:53.8 |
HIP 49759 |
25.09 |
| 2026-02-21 00:00 |
10:09:23.44 |
+27:34:29.6 |
HIP 49759 |
24.48 |
| 2026-02-21 12:00 |
10:09:15.64 |
+27:35:05.1 |
HIP 49759 |
23.99 |
| 2026-02-22 00:00 |
10:09:07.85 |
+27:35:40.3 |
HIP 49759 |
23.63 |
| 2026-02-22 12:00 |
10:09:00.05 |
+27:36:15.2 |
HIP 49759 |
23.42 |
| 2026-02-23 00:00 |
10:08:52.27 |
+27:36:49.8 |
HIP 49759 |
23.35 |
| 2026-02-23 12:00 |
10:08:44.49 |
+27:37:24.1 |
HIP 49759 |
23.43 |
| 2026-02-24 00:00 |
10:08:36.72 |
+27:37:58.1 |
HIP 49759 |
23.65 |