メタデータ
| 項目 |
値 |
| Designation |
C/2012 F6 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-03-24T12:20:06.757440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:07Z |
| Obs used |
3201 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
14.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-07-29.0000000 |
| e |
0.99849892 |
| q (au) |
0.731238 |
| a (au) |
487.140054 |
| i (deg) |
82.608873 |
| Ω (om, deg) |
332.715296 |
| ω (w, deg) |
304.986917 |
| M (ma, deg) |
0.011595 |
等級
散乱 + 全体線形
$$
M_a = (6.992 + 5.601\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.992 |
| n |
5.601 |
| gf |
0.993 |
| gb |
-0.972 |
| k |
0.966 |
| δ90 |
9.945 |
| 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 |
| 2012-01-22 |
2013-01-26 |
+10.6291 |
-3.477 |
| 2013-01-26 |
2013-02-05 |
-5.2545 |
-0.788 |
| 2013-02-05 |
2013-03-14 |
+0.6990 |
-1.791 |
| 2013-04-01 |
2013-06-19 |
+4.0507 |
-1.366 |
| 2013-06-19 |
2013-07-13 |
-5.5477 |
+1.307 |
| 2013-07-13 |
2013-08-08 |
-11.8318 |
+3.586 |
| 2013-08-08 |
2014-10-27 |
+0.7308 |
-0.852 |
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) |
| 2026-06-01 00:00 |
14:05:27.91 |
+76:39:08.0 |
HIP 68816 |
19.77 |
| 2026-06-01 12:00 |
14:05:14.91 |
+76:38:32.8 |
HIP 68816 |
20.35 |
| 2026-06-02 00:00 |
14:05:02.02 |
+76:37:57.2 |
HIP 68816 |
20.97 |
| 2026-06-02 12:00 |
14:04:49.22 |
+76:37:21.1 |
HIP 68816 |
21.62 |
| 2026-06-03 00:00 |
14:04:36.53 |
+76:36:44.7 |
HIP 68816 |
22.30 |
| 2026-06-03 12:00 |
14:04:23.94 |
+76:36:07.8 |
HIP 68816 |
23.00 |
| 2026-06-04 00:00 |
14:04:11.46 |
+76:35:30.6 |
HIP 68816 |
23.73 |
| 2026-06-04 12:00 |
14:03:59.08 |
+76:34:52.9 |
HIP 68816 |
24.48 |
| 2026-06-05 00:00 |
14:03:46.81 |
+76:34:14.9 |
HIP 68816 |
25.24 |
| 2026-06-05 12:00 |
14:03:34.65 |
+76:33:36.4 |
HIP 68816 |
26.02 |
| 2026-06-06 00:00 |
14:03:22.59 |
+76:32:57.6 |
HIP 68816 |
26.82 |
| 2026-06-06 12:00 |
14:03:10.64 |
+76:32:18.4 |
HIP 68816 |
27.63 |
| 2026-06-07 00:00 |
14:02:58.81 |
+76:31:38.7 |
HIP 67974 |
27.23 |
| 2026-06-07 12:00 |
14:02:47.08 |
+76:30:58.8 |
HIP 67974 |
26.52 |
| 2026-06-08 00:00 |
14:02:35.46 |
+76:30:18.4 |
HIP 67974 |
25.84 |
| 2026-06-08 12:00 |
14:02:23.96 |
+76:29:37.7 |
HIP 67974 |
25.18 |
| 2026-06-09 00:00 |
14:02:12.57 |
+76:28:56.5 |
HIP 67974 |
24.55 |
| 2026-06-09 12:00 |
14:02:01.29 |
+76:28:15.1 |
HIP 67974 |
23.95 |
| 2026-06-10 00:00 |
14:01:50.12 |
+76:27:33.2 |
HIP 67974 |
23.37 |
| 2026-06-10 12:00 |
14:01:39.07 |
+76:26:51.0 |
HIP 67974 |
22.83 |
| 2026-06-11 00:00 |
14:01:28.14 |
+76:26:08.5 |
HIP 67974 |
22.32 |
| 2026-06-11 12:00 |
14:01:17.32 |
+76:25:25.6 |
HIP 67974 |
21.84 |
| 2026-06-12 00:00 |
14:01:06.62 |
+76:24:42.4 |
HIP 67974 |
21.41 |
| 2026-06-12 12:00 |
14:00:56.03 |
+76:23:58.8 |
HIP 67974 |
21.02 |
| 2026-06-13 00:00 |
14:00:45.56 |
+76:23:14.8 |
HIP 67974 |
20.67 |
| 2026-06-13 12:00 |
14:00:35.21 |
+76:22:30.6 |
HIP 67974 |
20.36 |
| 2026-06-14 00:00 |
14:00:24.99 |
+76:21:46.0 |
HIP 67974 |
20.11 |
| 2026-06-14 12:00 |
14:00:14.88 |
+76:21:01.1 |
HIP 67974 |
19.91 |
| 2026-06-15 00:00 |
14:00:04.89 |
+76:20:15.8 |
HIP 67937 |
19.42 |
| 2026-06-15 12:00 |
13:59:55.02 |
+76:19:30.3 |
HIP 67937 |
18.70 |
| 2026-06-16 00:00 |
13:59:45.27 |
+76:18:44.4 |
HIP 67937 |
18.00 |
| 2026-06-16 12:00 |
13:59:35.65 |
+76:17:58.2 |
HIP 67937 |
17.34 |
| 2026-06-17 00:00 |
13:59:26.14 |
+76:17:11.7 |
HIP 67937 |
16.71 |
| 2026-06-17 12:00 |
13:59:16.76 |
+76:16:24.9 |
HIP 67937 |
16.11 |
| 2026-06-18 00:00 |
13:59:07.51 |
+76:15:37.9 |
HIP 67937 |
15.56 |
| 2026-06-18 12:00 |
13:58:58.37 |
+76:14:50.5 |
HIP 67937 |
15.06 |
| 2026-06-19 00:00 |
13:58:49.36 |
+76:14:02.8 |
HIP 67937 |
14.61 |
| 2026-06-19 12:00 |
13:58:40.48 |
+76:13:14.9 |
HIP 67937 |
14.22 |
| 2026-06-20 00:00 |
13:58:31.72 |
+76:12:26.6 |
HIP 67937 |
13.89 |
| 2026-06-20 12:00 |
13:58:23.08 |
+76:11:38.1 |
HIP 67937 |
13.63 |
| 2026-06-21 00:00 |
13:58:14.57 |
+76:10:49.4 |
HIP 67937 |
13.44 |
| 2026-06-21 12:00 |
13:58:06.18 |
+76:10:00.4 |
HIP 67937 |
13.32 |
| 2026-06-22 00:00 |
13:57:57.92 |
+76:09:11.1 |
HIP 67937 |
13.28 |