メタデータ
| 項目 |
値 |
| Designation |
C/2012 L1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-12-25T09:55:40.889280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:10Z |
| Obs used |
1489 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
8.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-20.0000000 |
| e |
0.99705290 |
| q (au) |
2.262410 |
| a (au) |
767.674452 |
| i (deg) |
87.219166 |
| Ω (om, deg) |
271.766875 |
| ω (w, deg) |
140.289327 |
| M (ma, deg) |
359.998359 |
等級
散乱 + 全体線形
$$
M_a = (12.971 + 4.294\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.971 |
| n |
4.294 |
| gf |
1.000 |
| gb |
-0.847 |
| k |
0.800 |
| 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 |
| 2012-06-01 |
2012-09-11 |
+7.1051 |
-3.451 |
| 2012-09-11 |
2012-12-24 |
-1.1140 |
-0.355 |
| 2012-12-26 |
2013-07-08 |
+4.6516 |
-1.625 |
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) |
| 2026-07-29 00:00 |
07:47:22.84 |
-82:54:11.2 |
HIP 37356 |
23.75 |
| 2026-07-29 12:00 |
07:47:54.58 |
-82:54:24.2 |
HIP 37356 |
24.52 |
| 2026-07-30 00:00 |
07:48:26.30 |
-82:54:37.5 |
HIP 37356 |
25.31 |
| 2026-07-30 12:00 |
07:48:57.99 |
-82:54:51.2 |
HIP 37356 |
26.12 |
| 2026-07-31 00:00 |
07:49:29.65 |
-82:55:05.2 |
HIP 37356 |
26.95 |
| 2026-07-31 12:00 |
07:50:01.28 |
-82:55:19.6 |
HIP 37356 |
27.79 |
| 2026-08-01 00:00 |
07:50:32.88 |
-82:55:34.3 |
HIP 37356 |
28.65 |
| 2026-08-01 12:00 |
07:51:04.46 |
-82:55:49.4 |
HIP 37356 |
29.52 |
| 2026-08-02 00:00 |
07:51:36.00 |
-82:56:04.8 |
HIP 37356 |
30.40 |
| 2026-08-02 12:00 |
07:52:07.51 |
-82:56:20.5 |
HIP 37356 |
31.29 |
| 2026-08-03 00:00 |
07:52:38.99 |
-82:56:36.6 |
HIP 37356 |
32.20 |
| 2026-08-03 12:00 |
07:53:10.44 |
-82:56:53.0 |
HIP 37356 |
33.11 |
| 2026-08-04 00:00 |
07:53:41.85 |
-82:57:09.8 |
HIP 37356 |
34.03 |
| 2026-08-04 12:00 |
07:54:13.23 |
-82:57:26.9 |
HIP 37356 |
34.96 |
| 2026-08-05 00:00 |
07:54:44.58 |
-82:57:44.3 |
HIP 37356 |
35.89 |
| 2026-08-05 12:00 |
07:55:15.89 |
-82:58:02.1 |
HIP 37356 |
36.84 |
| 2026-08-06 00:00 |
07:55:47.16 |
-82:58:20.2 |
HIP 37356 |
37.78 |
| 2026-08-06 12:00 |
07:56:18.39 |
-82:58:38.6 |
HIP 37356 |
38.74 |
| 2026-08-07 00:00 |
07:56:49.59 |
-82:58:57.4 |
HIP 37356 |
39.69 |
| 2026-08-07 12:00 |
07:57:20.74 |
-82:59:16.6 |
HIP 37356 |
40.66 |
| 2026-08-08 00:00 |
07:57:51.86 |
-82:59:36.1 |
HIP 37356 |
41.62 |
| 2026-08-08 12:00 |
07:58:22.93 |
-82:59:55.9 |
HIP 37356 |
42.59 |
| 2026-08-09 00:00 |
07:58:53.96 |
-83:00:16.0 |
HIP 37356 |
43.57 |
| 2026-08-09 12:00 |
07:59:24.95 |
-83:00:36.5 |
HIP 38537 |
43.92 |
| 2026-08-10 00:00 |
07:59:55.89 |
-83:00:57.4 |
HIP 38537 |
43.80 |
| 2026-08-10 12:00 |
08:00:26.79 |
-83:01:18.5 |
HIP 38537 |
43.69 |
| 2026-08-11 00:00 |
08:00:57.64 |
-83:01:40.0 |
HIP 38537 |
43.60 |
| 2026-08-11 12:00 |
08:01:28.45 |
-83:02:01.9 |
HIP 38537 |
43.52 |
| 2026-08-12 00:00 |
08:01:59.20 |
-83:02:24.1 |
HIP 38537 |
43.46 |
| 2026-08-12 12:00 |
08:02:29.91 |
-83:02:46.6 |
HIP 38537 |
43.41 |
| 2026-08-13 00:00 |
08:03:00.56 |
-83:03:09.5 |
HIP 38537 |
43.38 |
| 2026-08-13 12:00 |
08:03:31.17 |
-83:03:32.7 |
HIP 38537 |
43.36 |
| 2026-08-14 00:00 |
08:04:01.72 |
-83:03:56.2 |
HIP 38537 |
43.36 |
| 2026-08-14 12:00 |
08:04:32.21 |
-83:04:20.1 |
HIP 38537 |
43.37 |
| 2026-08-15 00:00 |
08:05:02.65 |
-83:04:44.3 |
HIP 38537 |
43.40 |
| 2026-08-15 12:00 |
08:05:33.04 |
-83:05:08.8 |
HIP 38537 |
43.44 |
| 2026-08-16 00:00 |
08:06:03.36 |
-83:05:33.7 |
HIP 38537 |
43.50 |
| 2026-08-16 12:00 |
08:06:33.63 |
-83:05:58.9 |
HIP 38537 |
43.57 |
| 2026-08-17 00:00 |
08:07:03.84 |
-83:06:24.4 |
HIP 38537 |
43.66 |
| 2026-08-17 12:00 |
08:07:34.00 |
-83:06:50.3 |
HIP 38537 |
43.76 |
| 2026-08-18 00:00 |
08:08:04.08 |
-83:07:16.5 |
HIP 38537 |
43.87 |
| 2026-08-18 12:00 |
08:08:34.11 |
-83:07:43.0 |
HIP 38537 |
44.00 |
| 2026-08-19 00:00 |
08:09:04.08 |
-83:08:09.9 |
HIP 38537 |
44.14 |