メタデータ
| 項目 |
値 |
| Designation |
C/2012 L3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-06-12T05:16:49.045440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:16Z |
| Obs used |
255 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
15.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-07-18.0000000 |
| e |
0.99079164 |
| q (au) |
3.045029 |
| a (au) |
330.681042 |
| i (deg) |
134.196647 |
| Ω (om, deg) |
53.489782 |
| ω (w, deg) |
107.093418 |
| M (ma, deg) |
0.005864 |
等級
散乱 + 全体線形
$$
M_a = (10.623 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.623 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.692 |
| 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 |
| 2012-06-12 |
2013-05-08 |
+8.7931 |
-4.384 |
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) |
| 2026-09-25 00:00 |
10:12:26.75 |
-33:53:11.0 |
HIP 49979 |
2.85 |
| 2026-09-25 12:00 |
10:12:30.04 |
-33:53:44.2 |
HIP 49979 |
3.25 |
| 2026-09-26 00:00 |
10:12:33.31 |
-33:54:17.5 |
HIP 49979 |
3.80 |
| 2026-09-26 12:00 |
10:12:36.56 |
-33:54:51.1 |
HIP 49979 |
4.46 |
| 2026-09-27 00:00 |
10:12:39.79 |
-33:55:25.0 |
HIP 49979 |
5.18 |
| 2026-09-27 12:00 |
10:12:43.00 |
-33:55:59.0 |
HIP 49979 |
5.94 |
| 2026-09-28 00:00 |
10:12:46.20 |
-33:56:33.2 |
HIP 49979 |
6.72 |
| 2026-09-28 12:00 |
10:12:49.37 |
-33:57:07.7 |
HIP 49979 |
7.52 |
| 2026-09-29 00:00 |
10:12:52.52 |
-33:57:42.4 |
HIP 49979 |
8.33 |
| 2026-09-29 12:00 |
10:12:55.65 |
-33:58:17.3 |
HIP 49979 |
9.15 |
| 2026-09-30 00:00 |
10:12:58.77 |
-33:58:52.4 |
HIP 49979 |
9.98 |
| 2026-09-30 12:00 |
10:13:01.86 |
-33:59:27.7 |
HIP 49979 |
10.81 |
| 2026-10-01 00:00 |
10:13:04.93 |
-34:00:03.3 |
HIP 49979 |
11.65 |
| 2026-10-01 12:00 |
10:13:07.98 |
-34:00:39.0 |
HIP 49979 |
12.49 |
| 2026-10-02 00:00 |
10:13:11.01 |
-34:01:15.0 |
HIP 49979 |
13.32 |
| 2026-10-02 12:00 |
10:13:14.01 |
-34:01:51.1 |
HIP 49979 |
14.16 |
| 2026-10-03 00:00 |
10:13:17.00 |
-34:02:27.4 |
HIP 49979 |
15.01 |
| 2026-10-03 12:00 |
10:13:19.96 |
-34:03:04.0 |
HIP 49979 |
15.85 |
| 2026-10-04 00:00 |
10:13:22.90 |
-34:03:40.7 |
HIP 49979 |
16.69 |
| 2026-10-04 12:00 |
10:13:25.82 |
-34:04:17.6 |
HIP 49979 |
17.53 |
| 2026-10-05 00:00 |
10:13:28.71 |
-34:04:54.7 |
HIP 49979 |
18.37 |
| 2026-10-05 12:00 |
10:13:31.58 |
-34:05:32.0 |
HIP 49979 |
19.21 |
| 2026-10-06 00:00 |
10:13:34.43 |
-34:06:09.5 |
HIP 49979 |
20.05 |
| 2026-10-06 12:00 |
10:13:37.26 |
-34:06:47.2 |
HIP 49979 |
20.89 |
| 2026-10-07 00:00 |
10:13:40.06 |
-34:07:25.1 |
HIP 49979 |
21.73 |
| 2026-10-07 12:00 |
10:13:42.83 |
-34:08:03.1 |
HIP 49979 |
22.57 |
| 2026-10-08 00:00 |
10:13:45.59 |
-34:08:41.3 |
HIP 49979 |
23.40 |
| 2026-10-08 12:00 |
10:13:48.31 |
-34:09:19.7 |
HIP 49979 |
24.24 |
| 2026-10-09 00:00 |
10:13:51.01 |
-34:09:58.2 |
HIP 49979 |
25.07 |
| 2026-10-09 12:00 |
10:13:53.69 |
-34:10:36.9 |
HIP 49979 |
25.90 |
| 2026-10-10 00:00 |
10:13:56.34 |
-34:11:15.8 |
HIP 49979 |
26.74 |
| 2026-10-10 12:00 |
10:13:58.97 |
-34:11:54.8 |
HIP 49979 |
27.56 |
| 2026-10-11 00:00 |
10:14:01.57 |
-34:12:34.0 |
HIP 49979 |
28.39 |
| 2026-10-11 12:00 |
10:14:04.14 |
-34:13:13.4 |
HIP 49943 |
28.77 |
| 2026-10-12 00:00 |
10:14:06.69 |
-34:13:52.9 |
HIP 49943 |
29.13 |
| 2026-10-12 12:00 |
10:14:09.21 |
-34:14:32.5 |
HIP 49943 |
29.51 |
| 2026-10-13 00:00 |
10:14:11.70 |
-34:15:12.4 |
HIP 49943 |
29.90 |
| 2026-10-13 12:00 |
10:14:14.17 |
-34:15:52.3 |
HIP 49943 |
30.30 |
| 2026-10-14 00:00 |
10:14:16.60 |
-34:16:32.4 |
HIP 49943 |
30.71 |
| 2026-10-14 12:00 |
10:14:19.01 |
-34:17:12.6 |
HIP 49943 |
31.14 |
| 2026-10-15 00:00 |
10:14:21.40 |
-34:17:53.0 |
HIP 49943 |
31.57 |
| 2026-10-15 12:00 |
10:14:23.75 |
-34:18:33.5 |
HIP 49943 |
32.02 |
| 2026-10-16 00:00 |
10:14:26.08 |
-34:19:14.1 |
HIP 50349 |
32.27 |