メタデータ
| 項目 |
値 |
| Designation |
C/2012 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-09T08:04:55.027200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:14Z |
| Obs used |
2119 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
6.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-12-18.0000000 |
| e |
0.99733350 |
| q (au) |
1.508545 |
| a (au) |
565.739557 |
| i (deg) |
70.980594 |
| Ω (om, deg) |
270.302116 |
| ω (w, deg) |
205.786395 |
| M (ma, deg) |
359.989575 |
等級
散乱 + 全体線形
$$
M_a = (11.171 + 4.614\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.171 |
| n |
4.614 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.874 |
| 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 |
| 2003-04-13 |
2012-06-17 |
-24.5614 |
+15.420 |
| 2012-06-17 |
2012-12-17 |
-0.8759 |
+0.427 |
| 2012-12-17 |
2013-05-09 |
+6.2793 |
-2.140 |
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 |
17:53:24.27 |
-23:11:16.2 |
HIP 87668 |
14.50 |
| 2026-09-20 12:00 |
17:53:24.34 |
-23:11:13.3 |
HIP 87668 |
14.50 |
| 2026-09-21 00:00 |
17:53:24.45 |
-23:11:10.3 |
HIP 87668 |
14.48 |
| 2026-09-21 12:00 |
17:53:24.60 |
-23:11:07.3 |
HIP 87668 |
14.46 |
| 2026-09-22 00:00 |
17:53:24.78 |
-23:11:04.3 |
HIP 87668 |
14.43 |
| 2026-09-22 12:00 |
17:53:24.99 |
-23:11:01.4 |
HIP 87668 |
14.39 |
| 2026-09-23 00:00 |
17:53:25.25 |
-23:10:58.4 |
HIP 87668 |
14.35 |
| 2026-09-23 12:00 |
17:53:25.54 |
-23:10:55.5 |
HIP 87668 |
14.29 |
| 2026-09-24 00:00 |
17:53:25.87 |
-23:10:52.6 |
HIP 87668 |
14.23 |
| 2026-09-24 12:00 |
17:53:26.23 |
-23:10:49.7 |
HIP 87668 |
14.16 |
| 2026-09-25 00:00 |
17:53:26.63 |
-23:10:46.7 |
HIP 87668 |
14.08 |
| 2026-09-25 12:00 |
17:53:27.06 |
-23:10:43.8 |
HIP 87668 |
14.00 |
| 2026-09-26 00:00 |
17:53:27.53 |
-23:10:40.9 |
HIP 87668 |
13.91 |
| 2026-09-26 12:00 |
17:53:28.04 |
-23:10:38.0 |
HIP 87668 |
13.81 |
| 2026-09-27 00:00 |
17:53:28.58 |
-23:10:35.1 |
HIP 87668 |
13.70 |
| 2026-09-27 12:00 |
17:53:29.16 |
-23:10:32.3 |
HIP 87668 |
13.58 |
| 2026-09-28 00:00 |
17:53:29.77 |
-23:10:29.4 |
HIP 87668 |
13.46 |
| 2026-09-28 12:00 |
17:53:30.42 |
-23:10:26.5 |
HIP 87668 |
13.33 |
| 2026-09-29 00:00 |
17:53:31.11 |
-23:10:23.7 |
HIP 87668 |
13.19 |
| 2026-09-29 12:00 |
17:53:31.83 |
-23:10:20.8 |
HIP 87668 |
13.05 |
| 2026-09-30 00:00 |
17:53:32.59 |
-23:10:18.0 |
HIP 87668 |
12.90 |
| 2026-09-30 12:00 |
17:53:33.38 |
-23:10:15.2 |
HIP 87668 |
12.74 |
| 2026-10-01 00:00 |
17:53:34.21 |
-23:10:12.3 |
HIP 87668 |
12.57 |
| 2026-10-01 12:00 |
17:53:35.07 |
-23:10:09.5 |
HIP 87668 |
12.40 |
| 2026-10-02 00:00 |
17:53:35.97 |
-23:10:06.7 |
HIP 87668 |
12.22 |
| 2026-10-02 12:00 |
17:53:36.90 |
-23:10:03.9 |
HIP 87668 |
12.03 |
| 2026-10-03 00:00 |
17:53:37.87 |
-23:10:01.1 |
HIP 87668 |
11.84 |
| 2026-10-03 12:00 |
17:53:38.87 |
-23:09:58.3 |
HIP 87668 |
11.64 |
| 2026-10-04 00:00 |
17:53:39.91 |
-23:09:55.5 |
HIP 87668 |
11.43 |
| 2026-10-04 12:00 |
17:53:40.99 |
-23:09:52.7 |
HIP 87668 |
11.22 |
| 2026-10-05 00:00 |
17:53:42.10 |
-23:09:50.0 |
HIP 87668 |
11.01 |
| 2026-10-05 12:00 |
17:53:43.24 |
-23:09:47.2 |
HIP 87668 |
10.78 |
| 2026-10-06 00:00 |
17:53:44.42 |
-23:09:44.4 |
HIP 87668 |
10.56 |
| 2026-10-06 12:00 |
17:53:45.63 |
-23:09:41.7 |
HIP 87668 |
10.32 |
| 2026-10-07 00:00 |
17:53:46.88 |
-23:09:38.9 |
HIP 87668 |
10.08 |
| 2026-10-07 12:00 |
17:53:48.17 |
-23:09:36.2 |
HIP 87668 |
9.84 |
| 2026-10-08 00:00 |
17:53:49.48 |
-23:09:33.5 |
HIP 87668 |
9.60 |
| 2026-10-08 12:00 |
17:53:50.84 |
-23:09:30.7 |
HIP 87668 |
9.35 |
| 2026-10-09 00:00 |
17:53:52.22 |
-23:09:28.0 |
HIP 87668 |
9.10 |
| 2026-10-09 12:00 |
17:53:53.64 |
-23:09:25.3 |
HIP 87668 |
8.84 |
| 2026-10-10 00:00 |
17:53:55.10 |
-23:09:22.6 |
HIP 87668 |
8.59 |
| 2026-10-10 12:00 |
17:53:56.59 |
-23:09:19.9 |
HIP 87668 |
8.33 |
| 2026-10-11 00:00 |
17:53:58.11 |
-23:09:17.2 |
HIP 87668 |
8.08 |