C/2012 K5 (LINEAR)
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
$$
M_a = (12.249 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.249 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.997 |
| 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 |
-3.463 |
| 2012-08-18 |
2012-11-25 |
+1.6210 |
-1.549 |
| 2012-11-29 |
2013-04-14 |
+6.5546 |
-0.561 |
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) |
| 2026-02-03 00:00 |
22:08:18.32 |
-81:05:32.4 |
HIP 110158 |
25.40 |
| 2026-02-03 12:00 |
22:08:40.11 |
-81:05:08.6 |
HIP 110158 |
24.49 |
| 2026-02-04 00:00 |
22:09:01.94 |
-81:04:45.1 |
HIP 110158 |
23.57 |
| 2026-02-04 12:00 |
22:09:23.78 |
-81:04:22.0 |
HIP 110158 |
22.66 |
| 2026-02-05 00:00 |
22:09:45.65 |
-81:03:59.3 |
HIP 110158 |
21.75 |
| 2026-02-05 12:00 |
22:10:07.54 |
-81:03:36.9 |
HIP 110158 |
20.84 |
| 2026-02-06 00:00 |
22:10:29.45 |
-81:03:14.9 |
HIP 110158 |
19.93 |
| 2026-02-06 12:00 |
22:10:51.38 |
-81:02:53.3 |
HIP 110158 |
19.02 |
| 2026-02-07 00:00 |
22:11:13.33 |
-81:02:32.1 |
HIP 110158 |
18.11 |
| 2026-02-07 12:00 |
22:11:35.30 |
-81:02:11.2 |
HIP 110158 |
17.21 |
| 2026-02-08 00:00 |
22:11:57.29 |
-81:01:50.7 |
HIP 110158 |
16.31 |
| 2026-02-08 12:00 |
22:12:19.29 |
-81:01:30.6 |
HIP 110158 |
15.40 |
| 2026-02-09 00:00 |
22:12:41.30 |
-81:01:10.8 |
HIP 110158 |
14.50 |
| 2026-02-09 12:00 |
22:13:03.34 |
-81:00:51.5 |
HIP 110158 |
13.60 |
| 2026-02-10 00:00 |
22:13:25.38 |
-81:00:32.5 |
HIP 110158 |
12.71 |
| 2026-02-10 12:00 |
22:13:47.44 |
-81:00:13.9 |
HIP 110158 |
11.82 |
| 2026-02-11 00:00 |
22:14:09.51 |
-80:59:55.7 |
HIP 110158 |
10.93 |
| 2026-02-11 12:00 |
22:14:31.59 |
-80:59:37.8 |
HIP 110158 |
10.04 |
| 2026-02-12 00:00 |
22:14:53.69 |
-80:59:20.4 |
HIP 110158 |
9.16 |
| 2026-02-12 12:00 |
22:15:15.79 |
-80:59:03.3 |
HIP 110158 |
8.28 |
| 2026-02-13 00:00 |
22:15:37.90 |
-80:58:46.6 |
HIP 110158 |
7.41 |
| 2026-02-13 12:00 |
22:16:00.01 |
-80:58:30.3 |
HIP 110158 |
6.55 |
| 2026-02-14 00:00 |
22:16:22.14 |
-80:58:14.4 |
HIP 110158 |
5.71 |
| 2026-02-14 12:00 |
22:16:44.27 |
-80:57:58.9 |
HIP 110158 |
4.88 |
| 2026-02-15 00:00 |
22:17:06.40 |
-80:57:43.7 |
HIP 110158 |
4.08 |
| 2026-02-15 12:00 |
22:17:28.54 |
-80:57:29.0 |
HIP 110158 |
3.34 |
| 2026-02-16 00:00 |
22:17:50.67 |
-80:57:14.6 |
HIP 110158 |
2.69 |
| 2026-02-16 12:00 |
22:18:12.82 |
-80:57:00.7 |
HIP 110158 |
2.22 |
| 2026-02-17 00:00 |
22:18:34.96 |
-80:56:47.1 |
HIP 110158 |
2.05 |
| 2026-02-17 12:00 |
22:18:57.10 |
-80:56:34.0 |
HIP 110158 |
2.25 |
| 2026-02-18 00:00 |
22:19:19.24 |
-80:56:21.2 |
HIP 110158 |
2.74 |
| 2026-02-18 12:00 |
22:19:41.37 |
-80:56:08.8 |
HIP 110158 |
3.39 |
| 2026-02-19 00:00 |
22:20:03.51 |
-80:55:56.8 |
HIP 110158 |
4.13 |
| 2026-02-19 12:00 |
22:20:25.64 |
-80:55:45.3 |
HIP 110158 |
4.92 |
| 2026-02-20 00:00 |
22:20:47.76 |
-80:55:34.1 |
HIP 110158 |
5.73 |
| 2026-02-20 12:00 |
22:21:09.88 |
-80:55:23.3 |
HIP 110158 |
6.56 |
| 2026-02-21 00:00 |
22:21:31.99 |
-80:55:12.9 |
HIP 110158 |
7.40 |
| 2026-02-21 12:00 |
22:21:54.09 |
-80:55:02.9 |
HIP 110158 |
8.25 |
| 2026-02-22 00:00 |
22:22:16.18 |
-80:54:53.3 |
HIP 110158 |
9.10 |
| 2026-02-22 12:00 |
22:22:38.27 |
-80:54:44.2 |
HIP 110158 |
9.96 |
| 2026-02-23 00:00 |
22:23:00.34 |
-80:54:35.4 |
HIP 110158 |
10.81 |
| 2026-02-23 12:00 |
22:23:22.40 |
-80:54:27.0 |
HIP 110158 |
11.67 |
| 2026-02-24 00:00 |
22:23:44.45 |
-80:54:19.0 |
HIP 110158 |
12.53 |