C/1990 K1 (Levy)
メタデータ
| 項目 |
値 |
| Designation |
C/1990 K1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-10-24T16:24:53.331840Z |
| Orbit solution date (soln_date, UTC) |
2023-08-19T20:42:31Z |
| Obs used |
666 |
| NEO |
- |
| M1 |
4.600 |
| K1 |
9.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1990-10-29.0000000 |
| e |
1.00058309 |
| q (au) |
0.938738 |
| a (au) |
-1609.945375 |
| i (deg) |
131.583977 |
| Ω (om, deg) |
139.364097 |
| ω (w, deg) |
242.666331 |
| M (ma, deg) |
0.000066 |
等級
散乱 + 全体線形
$$
M_a = (4.561 + 3.402\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.561 |
| n |
3.402 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.916 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1990-05-20 |
1990-07-17 |
+0.5609 |
-0.382 |
| 1990-07-17 |
1990-10-23 |
-2.7924 |
+0.454 |
| 1990-10-24 |
1990-11-23 |
-20.9665 |
+0.800 |
| 1990-11-23 |
1991-04-16 |
+1.9101 |
+0.046 |
| 1991-04-16 |
1991-11-07 |
-5.4663 |
+3.746 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:15:58.41 |
+56:51:00.9 |
HIP 34886 |
23.43 |
| 2026-02-03 12:00 |
07:15:55.06 |
+56:50:56.7 |
HIP 34886 |
22.97 |
| 2026-02-04 00:00 |
07:15:51.72 |
+56:50:52.3 |
HIP 34886 |
22.51 |
| 2026-02-04 12:00 |
07:15:48.40 |
+56:50:47.8 |
HIP 34886 |
22.06 |
| 2026-02-05 00:00 |
07:15:45.09 |
+56:50:43.2 |
HIP 34886 |
21.60 |
| 2026-02-05 12:00 |
07:15:41.80 |
+56:50:38.3 |
HIP 34886 |
21.15 |
| 2026-02-06 00:00 |
07:15:38.52 |
+56:50:33.4 |
HIP 34886 |
20.71 |
| 2026-02-06 12:00 |
07:15:35.27 |
+56:50:28.2 |
HIP 34886 |
20.26 |
| 2026-02-07 00:00 |
07:15:32.02 |
+56:50:23.0 |
HIP 34886 |
19.82 |
| 2026-02-07 12:00 |
07:15:28.80 |
+56:50:17.5 |
HIP 34886 |
19.38 |
| 2026-02-08 00:00 |
07:15:25.59 |
+56:50:12.0 |
HIP 34886 |
18.95 |
| 2026-02-08 12:00 |
07:15:22.40 |
+56:50:06.3 |
HIP 34886 |
18.51 |
| 2026-02-09 00:00 |
07:15:19.23 |
+56:50:00.4 |
HIP 34886 |
18.08 |
| 2026-02-09 12:00 |
07:15:16.08 |
+56:49:54.4 |
HIP 34886 |
17.66 |
| 2026-02-10 00:00 |
07:15:12.94 |
+56:49:48.3 |
HIP 34886 |
17.23 |
| 2026-02-10 12:00 |
07:15:09.82 |
+56:49:42.0 |
HIP 34886 |
16.81 |
| 2026-02-11 00:00 |
07:15:06.72 |
+56:49:35.5 |
HIP 34886 |
16.40 |
| 2026-02-11 12:00 |
07:15:03.64 |
+56:49:29.0 |
HIP 34886 |
15.98 |
| 2026-02-12 00:00 |
07:15:00.58 |
+56:49:22.2 |
HIP 34886 |
15.58 |
| 2026-02-12 12:00 |
07:14:57.54 |
+56:49:15.4 |
HIP 34886 |
15.17 |
| 2026-02-13 00:00 |
07:14:54.52 |
+56:49:08.4 |
HIP 34886 |
14.77 |
| 2026-02-13 12:00 |
07:14:51.52 |
+56:49:01.2 |
HIP 34886 |
14.38 |
| 2026-02-14 00:00 |
07:14:48.54 |
+56:48:53.9 |
HIP 34886 |
13.99 |
| 2026-02-14 12:00 |
07:14:45.57 |
+56:48:46.5 |
HIP 34886 |
13.60 |
| 2026-02-15 00:00 |
07:14:42.63 |
+56:48:39.0 |
HIP 34886 |
13.22 |
| 2026-02-15 12:00 |
07:14:39.71 |
+56:48:31.3 |
HIP 34886 |
12.85 |
| 2026-02-16 00:00 |
07:14:36.82 |
+56:48:23.4 |
HIP 34886 |
12.48 |
| 2026-02-16 12:00 |
07:14:33.94 |
+56:48:15.5 |
HIP 34886 |
12.12 |
| 2026-02-17 00:00 |
07:14:31.08 |
+56:48:07.4 |
HIP 34886 |
11.77 |
| 2026-02-17 12:00 |
07:14:28.25 |
+56:47:59.1 |
HIP 34886 |
11.42 |
| 2026-02-18 00:00 |
07:14:25.44 |
+56:47:50.8 |
HIP 34886 |
11.08 |
| 2026-02-18 12:00 |
07:14:22.65 |
+56:47:42.3 |
HIP 34886 |
10.75 |
| 2026-02-19 00:00 |
07:14:19.88 |
+56:47:33.6 |
HIP 34886 |
10.43 |
| 2026-02-19 12:00 |
07:14:17.14 |
+56:47:24.9 |
HIP 34886 |
10.12 |
| 2026-02-20 00:00 |
07:14:14.42 |
+56:47:16.0 |
HIP 34886 |
9.82 |
| 2026-02-20 12:00 |
07:14:11.72 |
+56:47:07.0 |
HIP 34886 |
9.53 |
| 2026-02-21 00:00 |
07:14:09.05 |
+56:46:57.8 |
HIP 34886 |
9.25 |
| 2026-02-21 12:00 |
07:14:06.40 |
+56:46:48.5 |
HIP 34886 |
8.98 |
| 2026-02-22 00:00 |
07:14:03.77 |
+56:46:39.1 |
HIP 34886 |
8.73 |
| 2026-02-22 12:00 |
07:14:01.17 |
+56:46:29.6 |
HIP 34886 |
8.49 |
| 2026-02-23 00:00 |
07:13:58.59 |
+56:46:20.0 |
HIP 34886 |
8.27 |
| 2026-02-23 12:00 |
07:13:56.03 |
+56:46:10.2 |
HIP 34886 |
8.06 |
| 2026-02-24 00:00 |
07:13:53.50 |
+56:46:00.3 |
HIP 34886 |
7.87 |