メタデータ
| 項目 |
値 |
| Designation |
C/2012 K5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-11-28T16:30:24.831360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:09Z |
| Obs used |
4281 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
5.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-10-15.0000000 |
| e |
0.99852650 |
| q (au) |
1.141811 |
| a (au) |
774.896185 |
| i (deg) |
92.848025 |
| Ω (om, deg) |
279.039021 |
| ω (w, deg) |
139.289759 |
| M (ma, deg) |
359.997958 |
等級
散乱 + 全体線形
$$
M_a = (12.248 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.248 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2012-05-06 |
2012-08-18 |
+8.9448 |
-3.462 |
| 2012-08-18 |
2012-11-25 |
+1.6210 |
-1.548 |
| 2012-11-29 |
2013-04-14 |
+6.6103 |
-0.571 |
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 |
21:45:01.45 |
-84:08:51.8 |
HIP 107239 |
2.73 |
| 2026-09-20 12:00 |
21:44:31.04 |
-84:08:24.7 |
HIP 107239 |
1.95 |
| 2026-09-21 00:00 |
21:44:00.89 |
-84:07:57.1 |
HIP 107239 |
1.34 |
| 2026-09-21 12:00 |
21:43:31.00 |
-84:07:29.0 |
HIP 107239 |
1.19 |
| 2026-09-22 00:00 |
21:43:01.37 |
-84:07:00.4 |
HIP 107239 |
1.63 |
| 2026-09-22 12:00 |
21:42:32.01 |
-84:06:31.3 |
HIP 107239 |
2.35 |
| 2026-09-23 00:00 |
21:42:02.91 |
-84:06:01.8 |
HIP 107239 |
3.16 |
| 2026-09-23 12:00 |
21:41:34.08 |
-84:05:31.7 |
HIP 107239 |
4.01 |
| 2026-09-24 00:00 |
21:41:05.53 |
-84:05:01.2 |
HIP 107239 |
4.88 |
| 2026-09-24 12:00 |
21:40:37.25 |
-84:04:30.2 |
HIP 107239 |
5.76 |
| 2026-09-25 00:00 |
21:40:09.25 |
-84:03:58.7 |
HIP 107239 |
6.64 |
| 2026-09-25 12:00 |
21:39:41.53 |
-84:03:26.8 |
HIP 107239 |
7.53 |
| 2026-09-26 00:00 |
21:39:14.09 |
-84:02:54.4 |
HIP 107239 |
8.41 |
| 2026-09-26 12:00 |
21:38:46.94 |
-84:02:21.6 |
HIP 107239 |
9.30 |
| 2026-09-27 00:00 |
21:38:20.07 |
-84:01:48.3 |
HIP 107239 |
10.19 |
| 2026-09-27 12:00 |
21:37:53.49 |
-84:01:14.5 |
HIP 107239 |
11.08 |
| 2026-09-28 00:00 |
21:37:27.20 |
-84:00:40.4 |
HIP 107239 |
11.97 |
| 2026-09-28 12:00 |
21:37:01.20 |
-84:00:05.7 |
HIP 107239 |
12.86 |
| 2026-09-29 00:00 |
21:36:35.49 |
-83:59:30.7 |
HIP 107239 |
13.75 |
| 2026-09-29 12:00 |
21:36:10.08 |
-83:58:55.2 |
HIP 107239 |
14.64 |
| 2026-09-30 00:00 |
21:35:44.97 |
-83:58:19.3 |
HIP 107239 |
15.53 |
| 2026-09-30 12:00 |
21:35:20.16 |
-83:57:43.0 |
HIP 107239 |
16.42 |
| 2026-10-01 00:00 |
21:34:55.64 |
-83:57:06.2 |
HIP 107239 |
17.31 |
| 2026-10-01 12:00 |
21:34:31.43 |
-83:56:29.1 |
HIP 107239 |
18.20 |
| 2026-10-02 00:00 |
21:34:07.52 |
-83:55:51.5 |
HIP 107239 |
19.09 |
| 2026-10-02 12:00 |
21:33:43.92 |
-83:55:13.5 |
HIP 107239 |
19.98 |
| 2026-10-03 00:00 |
21:33:20.62 |
-83:54:35.2 |
HIP 107239 |
20.87 |
| 2026-10-03 12:00 |
21:32:57.63 |
-83:53:56.4 |
HIP 107239 |
21.75 |
| 2026-10-04 00:00 |
21:32:34.95 |
-83:53:17.3 |
HIP 107239 |
22.64 |
| 2026-10-04 12:00 |
21:32:12.57 |
-83:52:37.7 |
HIP 107239 |
23.53 |
| 2026-10-05 00:00 |
21:31:50.51 |
-83:51:57.8 |
HIP 107239 |
24.41 |
| 2026-10-05 12:00 |
21:31:28.76 |
-83:51:17.6 |
HIP 107239 |
25.30 |
| 2026-10-06 00:00 |
21:31:07.32 |
-83:50:36.9 |
HIP 107239 |
26.18 |
| 2026-10-06 12:00 |
21:30:46.20 |
-83:49:55.9 |
HIP 107239 |
27.07 |
| 2026-10-07 00:00 |
21:30:25.39 |
-83:49:14.5 |
HIP 107239 |
27.95 |
| 2026-10-07 12:00 |
21:30:04.90 |
-83:48:32.8 |
HIP 107239 |
28.83 |
| 2026-10-08 00:00 |
21:29:44.72 |
-83:47:50.7 |
HIP 107239 |
29.72 |
| 2026-10-08 12:00 |
21:29:24.86 |
-83:47:08.3 |
HIP 107239 |
30.60 |
| 2026-10-09 00:00 |
21:29:05.32 |
-83:46:25.5 |
HIP 107239 |
31.48 |
| 2026-10-09 12:00 |
21:28:46.10 |
-83:45:42.4 |
HIP 107239 |
32.36 |
| 2026-10-10 00:00 |
21:28:27.19 |
-83:44:59.0 |
HIP 107239 |
33.24 |
| 2026-10-10 12:00 |
21:28:08.61 |
-83:44:15.2 |
HIP 105511 |
33.25 |
| 2026-10-11 00:00 |
21:27:50.34 |
-83:43:31.2 |
HIP 105511 |
32.40 |