メタデータ
| 項目 |
値 |
| Designation |
C/2013 G6 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-25T05:28:45.828480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
230 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
27.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-06-18.0000000 |
| e |
0.99470498 |
| q (au) |
2.048499 |
| a (au) |
386.872597 |
| i (deg) |
124.084326 |
| Ω (om, deg) |
44.567402 |
| ω (w, deg) |
215.692475 |
| M (ma, deg) |
359.995178 |
等級
散乱 + 全体線形
$$
M_a = (13.905 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.905 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.985 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2013-04-13 |
2013-07-08 |
+39.8450 |
-14.076 |
| 2013-08-03 |
2014-02-05 |
+22.5987 |
-10.710 |
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) |
| 2026-09-20 00:00 |
02:35:43.49 |
+20:11:41.0 |
HIP 12097 |
2.73 |
| 2026-09-20 12:00 |
02:35:40.18 |
+20:11:33.4 |
HIP 12097 |
3.47 |
| 2026-09-21 00:00 |
02:35:36.85 |
+20:11:25.5 |
HIP 12097 |
4.22 |
| 2026-09-21 12:00 |
02:35:33.48 |
+20:11:17.5 |
HIP 12097 |
5.00 |
| 2026-09-22 00:00 |
02:35:30.10 |
+20:11:09.4 |
HIP 12097 |
5.79 |
| 2026-09-22 12:00 |
02:35:26.69 |
+20:11:01.1 |
HIP 12097 |
6.59 |
| 2026-09-23 00:00 |
02:35:23.25 |
+20:10:52.7 |
HIP 12097 |
7.39 |
| 2026-09-23 12:00 |
02:35:19.79 |
+20:10:44.1 |
HIP 12097 |
8.21 |
| 2026-09-24 00:00 |
02:35:16.31 |
+20:10:35.4 |
HIP 12097 |
9.03 |
| 2026-09-24 12:00 |
02:35:12.80 |
+20:10:26.5 |
HIP 12097 |
9.87 |
| 2026-09-25 00:00 |
02:35:09.27 |
+20:10:17.4 |
HIP 12097 |
10.70 |
| 2026-09-25 12:00 |
02:35:05.71 |
+20:10:08.3 |
HIP 12097 |
11.55 |
| 2026-09-26 00:00 |
02:35:02.13 |
+20:09:58.9 |
HIP 12097 |
12.40 |
| 2026-09-26 12:00 |
02:34:58.53 |
+20:09:49.5 |
HIP 12097 |
13.26 |
| 2026-09-27 00:00 |
02:34:54.90 |
+20:09:39.9 |
HIP 11968 |
12.90 |
| 2026-09-27 12:00 |
02:34:51.26 |
+20:09:30.1 |
HIP 11968 |
12.29 |
| 2026-09-28 00:00 |
02:34:47.59 |
+20:09:20.2 |
HIP 11968 |
11.71 |
| 2026-09-28 12:00 |
02:34:43.89 |
+20:09:10.2 |
HIP 11968 |
11.17 |
| 2026-09-29 00:00 |
02:34:40.18 |
+20:09:00.0 |
HIP 11968 |
10.66 |
| 2026-09-29 12:00 |
02:34:36.44 |
+20:08:49.7 |
HIP 11968 |
10.21 |
| 2026-09-30 00:00 |
02:34:32.69 |
+20:08:39.2 |
HIP 11968 |
9.81 |
| 2026-09-30 12:00 |
02:34:28.91 |
+20:08:28.6 |
HIP 11968 |
9.48 |
| 2026-10-01 00:00 |
02:34:25.11 |
+20:08:17.8 |
HIP 11968 |
9.22 |
| 2026-10-01 12:00 |
02:34:21.29 |
+20:08:07.0 |
HIP 11968 |
9.04 |
| 2026-10-02 00:00 |
02:34:17.45 |
+20:07:55.9 |
HIP 11968 |
8.96 |
| 2026-10-02 12:00 |
02:34:13.59 |
+20:07:44.8 |
HIP 11968 |
8.96 |
| 2026-10-03 00:00 |
02:34:09.71 |
+20:07:33.5 |
HIP 11968 |
9.07 |
| 2026-10-03 12:00 |
02:34:05.81 |
+20:07:22.1 |
HIP 11968 |
9.26 |
| 2026-10-04 00:00 |
02:34:01.89 |
+20:07:10.5 |
HIP 11968 |
9.54 |
| 2026-10-04 12:00 |
02:33:57.95 |
+20:06:58.8 |
HIP 11968 |
9.91 |
| 2026-10-05 00:00 |
02:33:54.00 |
+20:06:47.0 |
HIP 11968 |
10.35 |
| 2026-10-05 12:00 |
02:33:50.02 |
+20:06:35.0 |
HIP 11968 |
10.86 |
| 2026-10-06 00:00 |
02:33:46.03 |
+20:06:22.9 |
HIP 11968 |
11.42 |
| 2026-10-06 12:00 |
02:33:42.01 |
+20:06:10.7 |
HIP 11968 |
12.04 |
| 2026-10-07 00:00 |
02:33:37.99 |
+20:05:58.4 |
HIP 11968 |
12.70 |
| 2026-10-07 12:00 |
02:33:33.94 |
+20:05:45.9 |
HIP 11968 |
13.41 |
| 2026-10-08 00:00 |
02:33:29.88 |
+20:05:33.3 |
HIP 11968 |
14.15 |
| 2026-10-08 12:00 |
02:33:25.79 |
+20:05:20.6 |
HIP 11968 |
14.92 |
| 2026-10-09 00:00 |
02:33:21.70 |
+20:05:07.7 |
HIP 11968 |
15.71 |
| 2026-10-09 12:00 |
02:33:17.59 |
+20:04:54.7 |
HIP 11968 |
16.53 |
| 2026-10-10 00:00 |
02:33:13.46 |
+20:04:41.7 |
HIP 11968 |
17.37 |
| 2026-10-10 12:00 |
02:33:09.31 |
+20:04:28.4 |
HIP 11968 |
18.23 |
| 2026-10-11 00:00 |
02:33:05.15 |
+20:04:15.1 |
HIP 11968 |
19.10 |