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 |
-0.998 |
| 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) |
| 2026-05-12 00:00 |
23:09:05.12 |
-81:50:47.3 |
HIP 114281 |
18.19 |
| 2026-05-12 12:00 |
23:09:14.60 |
-81:51:35.1 |
HIP 114281 |
19.00 |
| 2026-05-13 00:00 |
23:09:23.91 |
-81:52:23.1 |
HIP 114281 |
19.82 |
| 2026-05-13 12:00 |
23:09:33.05 |
-81:53:11.3 |
HIP 114281 |
20.65 |
| 2026-05-14 00:00 |
23:09:42.03 |
-81:53:59.8 |
HIP 114281 |
21.48 |
| 2026-05-14 12:00 |
23:09:50.84 |
-81:54:48.5 |
HIP 114281 |
22.32 |
| 2026-05-15 00:00 |
23:09:59.49 |
-81:55:37.4 |
HIP 114281 |
23.16 |
| 2026-05-15 12:00 |
23:10:07.96 |
-81:56:26.5 |
HIP 114281 |
24.01 |
| 2026-05-16 00:00 |
23:10:16.25 |
-81:57:15.9 |
HIP 114281 |
24.86 |
| 2026-05-16 12:00 |
23:10:24.38 |
-81:58:05.4 |
HIP 114281 |
25.72 |
| 2026-05-17 00:00 |
23:10:32.33 |
-81:58:55.2 |
HIP 114281 |
26.58 |
| 2026-05-17 12:00 |
23:10:40.10 |
-81:59:45.2 |
HIP 114281 |
27.44 |
| 2026-05-18 00:00 |
23:10:47.69 |
-82:00:35.4 |
HIP 114281 |
28.31 |
| 2026-05-18 12:00 |
23:10:55.10 |
-82:01:25.8 |
HIP 114281 |
29.18 |
| 2026-05-19 00:00 |
23:11:02.34 |
-82:02:16.3 |
HIP 114281 |
30.05 |
| 2026-05-19 12:00 |
23:11:09.39 |
-82:03:07.1 |
HIP 114281 |
30.92 |
| 2026-05-20 00:00 |
23:11:16.25 |
-82:03:58.1 |
HIP 114281 |
31.80 |
| 2026-05-20 12:00 |
23:11:22.93 |
-82:04:49.2 |
HIP 114281 |
32.68 |
| 2026-05-21 00:00 |
23:11:29.43 |
-82:05:40.6 |
HIP 114281 |
33.56 |
| 2026-05-21 12:00 |
23:11:35.73 |
-82:06:32.1 |
HIP 114281 |
34.45 |
| 2026-05-22 00:00 |
23:11:41.85 |
-82:07:23.7 |
HIP 114281 |
35.33 |
| 2026-05-22 12:00 |
23:11:47.78 |
-82:08:15.6 |
HIP 114281 |
36.22 |
| 2026-05-23 00:00 |
23:11:53.51 |
-82:09:07.6 |
HIP 114281 |
37.11 |
| 2026-05-23 12:00 |
23:11:59.05 |
-82:09:59.8 |
HIP 113807 |
37.20 |
| 2026-05-24 00:00 |
23:12:04.40 |
-82:10:52.1 |
HIP 113807 |
36.52 |
| 2026-05-24 12:00 |
23:12:09.55 |
-82:11:44.6 |
HIP 113807 |
35.85 |
| 2026-05-25 00:00 |
23:12:14.51 |
-82:12:37.3 |
HIP 113807 |
35.18 |
| 2026-05-25 12:00 |
23:12:19.26 |
-82:13:30.1 |
HIP 113807 |
34.51 |
| 2026-05-26 00:00 |
23:12:23.82 |
-82:14:23.0 |
HIP 113807 |
33.84 |
| 2026-05-26 12:00 |
23:12:28.18 |
-82:15:16.1 |
HIP 113807 |
33.18 |
| 2026-05-27 00:00 |
23:12:32.33 |
-82:16:09.4 |
HIP 113807 |
32.53 |
| 2026-05-27 12:00 |
23:12:36.28 |
-82:17:02.7 |
HIP 113807 |
31.88 |
| 2026-05-28 00:00 |
23:12:40.03 |
-82:17:56.2 |
HIP 113807 |
31.24 |
| 2026-05-28 12:00 |
23:12:43.57 |
-82:18:49.8 |
HIP 113807 |
30.60 |
| 2026-05-29 00:00 |
23:12:46.90 |
-82:19:43.6 |
HIP 113807 |
29.97 |
| 2026-05-29 12:00 |
23:12:50.02 |
-82:20:37.5 |
HIP 113807 |
29.35 |
| 2026-05-30 00:00 |
23:12:52.93 |
-82:21:31.5 |
HIP 113807 |
28.74 |
| 2026-05-30 12:00 |
23:12:55.63 |
-82:22:25.6 |
HIP 113807 |
28.14 |
| 2026-05-31 00:00 |
23:12:58.11 |
-82:23:19.8 |
HIP 113807 |
27.55 |
| 2026-05-31 12:00 |
23:13:00.38 |
-82:24:14.1 |
HIP 113807 |
26.97 |
| 2026-06-01 00:00 |
23:13:02.44 |
-82:25:08.5 |
HIP 113807 |
26.40 |
| 2026-06-01 12:00 |
23:13:04.27 |
-82:26:03.1 |
HIP 113807 |
25.84 |
| 2026-06-02 00:00 |
23:13:05.89 |
-82:26:57.7 |
HIP 113807 |
25.30 |