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) |
| 2026-07-29 00:00 |
22:46:59.08 |
-84:01:48.9 |
HIP 111982 |
11.27 |
| 2026-07-29 12:00 |
22:46:29.00 |
-84:02:22.8 |
HIP 111982 |
10.30 |
| 2026-07-30 00:00 |
22:45:58.67 |
-84:02:56.2 |
HIP 111982 |
9.34 |
| 2026-07-30 12:00 |
22:45:28.09 |
-84:03:29.1 |
HIP 111982 |
8.37 |
| 2026-07-31 00:00 |
22:44:57.27 |
-84:04:01.6 |
HIP 111982 |
7.41 |
| 2026-07-31 12:00 |
22:44:26.21 |
-84:04:33.5 |
HIP 111982 |
6.45 |
| 2026-08-01 00:00 |
22:43:54.91 |
-84:05:04.9 |
HIP 111982 |
5.49 |
| 2026-08-01 12:00 |
22:43:23.38 |
-84:05:35.9 |
HIP 111982 |
4.53 |
| 2026-08-02 00:00 |
22:42:51.61 |
-84:06:06.3 |
HIP 111982 |
3.57 |
| 2026-08-02 12:00 |
22:42:19.62 |
-84:06:36.3 |
HIP 111982 |
2.61 |
| 2026-08-03 00:00 |
22:41:47.41 |
-84:07:05.7 |
HIP 111982 |
1.66 |
| 2026-08-03 12:00 |
22:41:14.97 |
-84:07:34.6 |
HIP 111982 |
0.75 |
| 2026-08-04 00:00 |
22:40:42.31 |
-84:08:03.1 |
HIP 111982 |
0.45 |
| 2026-08-04 12:00 |
22:40:09.45 |
-84:08:30.9 |
HIP 111982 |
1.30 |
| 2026-08-05 00:00 |
22:39:36.37 |
-84:08:58.3 |
HIP 111982 |
2.24 |
| 2026-08-05 12:00 |
22:39:03.08 |
-84:09:25.1 |
HIP 111982 |
3.19 |
| 2026-08-06 00:00 |
22:38:29.59 |
-84:09:51.4 |
HIP 111982 |
4.15 |
| 2026-08-06 12:00 |
22:37:55.90 |
-84:10:17.1 |
HIP 111982 |
5.11 |
| 2026-08-07 00:00 |
22:37:22.01 |
-84:10:42.4 |
HIP 111982 |
6.06 |
| 2026-08-07 12:00 |
22:36:47.94 |
-84:11:07.0 |
HIP 111982 |
7.02 |
| 2026-08-08 00:00 |
22:36:13.67 |
-84:11:31.1 |
HIP 111982 |
7.97 |
| 2026-08-08 12:00 |
22:35:39.23 |
-84:11:54.7 |
HIP 111982 |
8.93 |
| 2026-08-09 00:00 |
22:35:04.60 |
-84:12:17.7 |
HIP 111982 |
9.88 |
| 2026-08-09 12:00 |
22:34:29.80 |
-84:12:40.1 |
HIP 111982 |
10.84 |
| 2026-08-10 00:00 |
22:33:54.83 |
-84:13:02.0 |
HIP 111982 |
11.79 |
| 2026-08-10 12:00 |
22:33:19.70 |
-84:13:23.3 |
HIP 111982 |
12.74 |
| 2026-08-11 00:00 |
22:32:44.40 |
-84:13:44.0 |
HIP 111982 |
13.70 |
| 2026-08-11 12:00 |
22:32:08.95 |
-84:14:04.2 |
HIP 111982 |
14.65 |
| 2026-08-12 00:00 |
22:31:33.35 |
-84:14:23.7 |
HIP 111982 |
15.60 |
| 2026-08-12 12:00 |
22:30:57.60 |
-84:14:42.7 |
HIP 111982 |
16.55 |
| 2026-08-13 00:00 |
22:30:21.72 |
-84:15:01.1 |
HIP 111982 |
17.50 |
| 2026-08-13 12:00 |
22:29:45.70 |
-84:15:19.0 |
HIP 111982 |
18.45 |
| 2026-08-14 00:00 |
22:29:09.54 |
-84:15:36.2 |
HIP 111982 |
19.39 |
| 2026-08-14 12:00 |
22:28:33.27 |
-84:15:52.8 |
HIP 111982 |
20.34 |
| 2026-08-15 00:00 |
22:27:56.87 |
-84:16:08.9 |
HIP 111982 |
21.28 |
| 2026-08-15 12:00 |
22:27:20.36 |
-84:16:24.3 |
HIP 111982 |
22.23 |
| 2026-08-16 00:00 |
22:26:43.75 |
-84:16:39.2 |
HIP 111982 |
23.17 |
| 2026-08-16 12:00 |
22:26:07.03 |
-84:16:53.4 |
HIP 110428 |
23.82 |
| 2026-08-17 00:00 |
22:25:30.21 |
-84:17:07.1 |
HIP 110428 |
23.39 |
| 2026-08-17 12:00 |
22:24:53.30 |
-84:17:20.1 |
HIP 110428 |
23.01 |
| 2026-08-18 00:00 |
22:24:16.31 |
-84:17:32.5 |
HIP 110428 |
22.66 |
| 2026-08-18 12:00 |
22:23:39.23 |
-84:17:44.3 |
HIP 110428 |
22.35 |
| 2026-08-19 00:00 |
22:23:02.08 |
-84:17:55.6 |
HIP 110428 |
22.09 |