C/2012 K8 (Lemmon)
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) |
| 2026-02-03 00:00 |
08:31:34.52 |
+05:25:20.3 |
HIP 41898 |
23.59 |
| 2026-02-03 12:00 |
08:31:29.06 |
+05:25:31.4 |
HIP 41699 |
24.20 |
| 2026-02-04 00:00 |
08:31:23.60 |
+05:25:42.7 |
HIP 41699 |
23.15 |
| 2026-02-04 12:00 |
08:31:18.16 |
+05:25:54.2 |
HIP 41699 |
22.14 |
| 2026-02-05 00:00 |
08:31:12.72 |
+05:26:05.7 |
HIP 41699 |
21.17 |
| 2026-02-05 12:00 |
08:31:07.29 |
+05:26:17.4 |
HIP 41699 |
20.24 |
| 2026-02-06 00:00 |
08:31:01.87 |
+05:26:29.2 |
HIP 41699 |
19.38 |
| 2026-02-06 12:00 |
08:30:56.47 |
+05:26:41.1 |
HIP 41699 |
18.57 |
| 2026-02-07 00:00 |
08:30:51.07 |
+05:26:53.2 |
HIP 41699 |
17.84 |
| 2026-02-07 12:00 |
08:30:45.68 |
+05:27:05.3 |
HIP 41699 |
17.19 |
| 2026-02-08 00:00 |
08:30:40.30 |
+05:27:17.6 |
HIP 41699 |
16.62 |
| 2026-02-08 12:00 |
08:30:34.94 |
+05:27:29.9 |
HIP 41699 |
16.16 |
| 2026-02-09 00:00 |
08:30:29.59 |
+05:27:42.4 |
HIP 41699 |
15.79 |
| 2026-02-09 12:00 |
08:30:24.25 |
+05:27:55.0 |
HIP 41699 |
15.54 |
| 2026-02-10 00:00 |
08:30:18.93 |
+05:28:07.7 |
HIP 41699 |
15.41 |
| 2026-02-10 12:00 |
08:30:13.61 |
+05:28:20.5 |
HIP 41699 |
15.39 |
| 2026-02-11 00:00 |
08:30:08.32 |
+05:28:33.4 |
HIP 41699 |
15.49 |
| 2026-02-11 12:00 |
08:30:03.03 |
+05:28:46.4 |
HIP 41699 |
15.71 |
| 2026-02-12 00:00 |
08:29:57.76 |
+05:28:59.5 |
HIP 41699 |
16.03 |
| 2026-02-12 12:00 |
08:29:52.51 |
+05:29:12.7 |
HIP 41699 |
16.46 |
| 2026-02-13 00:00 |
08:29:47.27 |
+05:29:26.0 |
HIP 41699 |
16.98 |
| 2026-02-13 12:00 |
08:29:42.05 |
+05:29:39.4 |
HIP 41699 |
17.59 |
| 2026-02-14 00:00 |
08:29:36.84 |
+05:29:52.9 |
HIP 41699 |
18.27 |
| 2026-02-14 12:00 |
08:29:31.66 |
+05:30:06.4 |
HIP 41699 |
19.02 |
| 2026-02-15 00:00 |
08:29:26.49 |
+05:30:20.1 |
HIP 41699 |
19.82 |
| 2026-02-15 12:00 |
08:29:21.33 |
+05:30:33.8 |
HIP 41699 |
20.68 |
| 2026-02-16 00:00 |
08:29:16.20 |
+05:30:47.7 |
HIP 41699 |
21.57 |
| 2026-02-16 12:00 |
08:29:11.08 |
+05:31:01.6 |
HIP 41699 |
22.51 |
| 2026-02-17 00:00 |
08:29:05.99 |
+05:31:15.5 |
HIP 41699 |
23.48 |
| 2026-02-17 12:00 |
08:29:00.91 |
+05:31:29.6 |
HIP 41699 |
24.47 |
| 2026-02-18 00:00 |
08:28:55.85 |
+05:31:43.7 |
HIP 41699 |
25.49 |
| 2026-02-18 12:00 |
08:28:50.81 |
+05:31:57.9 |
HIP 41699 |
26.53 |
| 2026-02-19 00:00 |
08:28:45.80 |
+05:32:12.2 |
HIP 41699 |
27.59 |
| 2026-02-19 12:00 |
08:28:40.80 |
+05:32:26.5 |
HIP 41699 |
28.66 |
| 2026-02-20 00:00 |
08:28:35.83 |
+05:32:40.9 |
HIP 41699 |
29.74 |
| 2026-02-20 12:00 |
08:28:30.88 |
+05:32:55.4 |
HIP 41699 |
30.83 |
| 2026-02-21 00:00 |
08:28:25.95 |
+05:33:09.9 |
HIP 41699 |
31.93 |
| 2026-02-21 12:00 |
08:28:21.04 |
+05:33:24.5 |
HIP 41699 |
33.04 |
| 2026-02-22 00:00 |
08:28:16.16 |
+05:33:39.1 |
HIP 41699 |
34.15 |
| 2026-02-22 12:00 |
08:28:11.30 |
+05:33:53.8 |
HIP 41584 |
34.50 |
| 2026-02-23 00:00 |
08:28:06.46 |
+05:34:08.6 |
HIP 41584 |
34.55 |
| 2026-02-23 12:00 |
08:28:01.65 |
+05:34:23.4 |
HIP 41584 |
34.64 |
| 2026-02-24 00:00 |
08:27:56.86 |
+05:34:38.2 |
HIP 41584 |
34.78 |