メタデータ
| 項目 |
値 |
| Designation |
C/2012 K8 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-19T07:56:41.251200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:10Z |
| Obs used |
962 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
10.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-03-05.0000000 |
| e |
1.00234308 |
| q (au) |
6.463005 |
| a (au) |
-2758.336424 |
| i (deg) |
106.111263 |
| Ω (om, deg) |
312.805677 |
| ω (w, deg) |
75.849793 |
| M (ma, deg) |
-0.001138 |
等級
散乱 + 全体線形
$$
M_a = (4.963 + 3.997\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.963 |
| n |
3.997 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
08:24:05.52 |
+05:49:41.9 |
HIP 41020 |
28.50 |
| 2026-03-26 12:00 |
08:24:02.75 |
+05:49:56.0 |
HIP 41020 |
27.77 |
| 2026-03-27 00:00 |
08:24:00.03 |
+05:50:09.9 |
HIP 41020 |
27.06 |
| 2026-03-27 12:00 |
08:23:57.34 |
+05:50:23.9 |
HIP 41020 |
26.35 |
| 2026-03-28 00:00 |
08:23:54.70 |
+05:50:37.7 |
HIP 41020 |
25.65 |
| 2026-03-28 12:00 |
08:23:52.09 |
+05:50:51.4 |
HIP 41020 |
24.97 |
| 2026-03-29 00:00 |
08:23:49.53 |
+05:51:05.1 |
HIP 41020 |
24.29 |
| 2026-03-29 12:00 |
08:23:47.00 |
+05:51:18.7 |
HIP 41020 |
23.63 |
| 2026-03-30 00:00 |
08:23:44.51 |
+05:51:32.3 |
HIP 41020 |
22.97 |
| 2026-03-30 12:00 |
08:23:42.07 |
+05:51:45.7 |
HIP 41020 |
22.32 |
| 2026-03-31 00:00 |
08:23:39.67 |
+05:51:59.0 |
HIP 41020 |
21.69 |
| 2026-03-31 12:00 |
08:23:37.30 |
+05:52:12.3 |
HIP 41020 |
21.06 |
| 2026-04-01 00:00 |
08:23:34.98 |
+05:52:25.5 |
HIP 41020 |
20.45 |
| 2026-04-01 12:00 |
08:23:32.69 |
+05:52:38.6 |
HIP 41020 |
19.84 |
| 2026-04-02 00:00 |
08:23:30.45 |
+05:52:51.6 |
HIP 41020 |
19.25 |
| 2026-04-02 12:00 |
08:23:28.25 |
+05:53:04.5 |
HIP 41020 |
18.66 |
| 2026-04-03 00:00 |
08:23:26.09 |
+05:53:17.3 |
HIP 41020 |
18.09 |
| 2026-04-03 12:00 |
08:23:23.97 |
+05:53:30.1 |
HIP 41020 |
17.53 |
| 2026-04-04 00:00 |
08:23:21.89 |
+05:53:42.7 |
HIP 41020 |
16.97 |
| 2026-04-04 12:00 |
08:23:19.85 |
+05:53:55.2 |
HIP 41020 |
16.43 |
| 2026-04-05 00:00 |
08:23:17.86 |
+05:54:07.7 |
HIP 41020 |
15.90 |
| 2026-04-05 12:00 |
08:23:15.90 |
+05:54:20.0 |
HIP 41020 |
15.38 |
| 2026-04-06 00:00 |
08:23:13.99 |
+05:54:32.2 |
HIP 41020 |
14.87 |
| 2026-04-06 12:00 |
08:23:12.11 |
+05:54:44.4 |
HIP 41020 |
14.37 |
| 2026-04-07 00:00 |
08:23:10.28 |
+05:54:56.4 |
HIP 41020 |
13.89 |
| 2026-04-07 12:00 |
08:23:08.49 |
+05:55:08.3 |
HIP 41020 |
13.41 |
| 2026-04-08 00:00 |
08:23:06.74 |
+05:55:20.1 |
HIP 41020 |
12.95 |
| 2026-04-08 12:00 |
08:23:05.04 |
+05:55:31.8 |
HIP 41020 |
12.50 |
| 2026-04-09 00:00 |
08:23:03.37 |
+05:55:43.4 |
HIP 41020 |
12.05 |
| 2026-04-09 12:00 |
08:23:01.75 |
+05:55:54.9 |
HIP 41020 |
11.62 |
| 2026-04-10 00:00 |
08:23:00.17 |
+05:56:06.3 |
HIP 41020 |
11.21 |
| 2026-04-10 12:00 |
08:22:58.63 |
+05:56:17.5 |
HIP 41020 |
10.80 |
| 2026-04-11 00:00 |
08:22:57.13 |
+05:56:28.7 |
HIP 41020 |
10.41 |
| 2026-04-11 12:00 |
08:22:55.67 |
+05:56:39.7 |
HIP 41020 |
10.03 |
| 2026-04-12 00:00 |
08:22:54.26 |
+05:56:50.6 |
HIP 41020 |
9.66 |
| 2026-04-12 12:00 |
08:22:52.89 |
+05:57:01.4 |
HIP 41020 |
9.30 |
| 2026-04-13 00:00 |
08:22:51.56 |
+05:57:12.1 |
HIP 41020 |
8.96 |
| 2026-04-13 12:00 |
08:22:50.27 |
+05:57:22.6 |
HIP 41020 |
8.63 |
| 2026-04-14 00:00 |
08:22:49.02 |
+05:57:33.0 |
HIP 41020 |
8.32 |
| 2026-04-14 12:00 |
08:22:47.82 |
+05:57:43.3 |
HIP 41020 |
8.01 |
| 2026-04-15 00:00 |
08:22:46.66 |
+05:57:53.5 |
HIP 41020 |
7.73 |
| 2026-04-15 12:00 |
08:22:45.54 |
+05:58:03.5 |
HIP 41020 |
7.45 |
| 2026-04-16 00:00 |
08:22:44.46 |
+05:58:13.4 |
HIP 41020 |
7.19 |