メタデータ
| 項目 |
値 |
| Designation |
C/2005 K2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-07-05T09:27:35.389440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-16T12:09:59Z |
| Obs used |
13 |
| NEO |
- |
| M1 |
17.800 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-05-20.0000000 |
| e |
0.99999380 |
| q (au) |
0.544577 |
| a (au) |
87777.427104 |
| i (deg) |
102.045031 |
| Ω (om, deg) |
45.711970 |
| ω (w, deg) |
216.580465 |
| M (ma, deg) |
359.999998 |
等級
散乱 + 全体線形
$$
M_a = (12.756 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.756 |
| n |
6.000 |
| 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 |
| 2005-05-19 |
2005-06-11 |
+24.1511 |
+1.942 |
| 2005-06-11 |
2005-06-27 |
-13.3690 |
-1.981 |
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 |
02:04:00.60 |
+37:05:23.1 |
HIP 9770 |
21.14 |
| 2026-07-29 12:00 |
02:04:00.37 |
+37:05:40.3 |
HIP 9770 |
21.29 |
| 2026-07-30 00:00 |
02:04:00.11 |
+37:05:57.4 |
HIP 9770 |
21.45 |
| 2026-07-30 12:00 |
02:03:59.83 |
+37:06:14.3 |
HIP 9770 |
21.62 |
| 2026-07-31 00:00 |
02:03:59.51 |
+37:06:31.2 |
HIP 9770 |
21.79 |
| 2026-07-31 12:00 |
02:03:59.17 |
+37:06:47.9 |
HIP 9770 |
21.97 |
| 2026-08-01 00:00 |
02:03:58.80 |
+37:07:04.6 |
HIP 9770 |
22.16 |
| 2026-08-01 12:00 |
02:03:58.41 |
+37:07:21.1 |
HIP 9770 |
22.35 |
| 2026-08-02 00:00 |
02:03:57.99 |
+37:07:37.4 |
HIP 9770 |
22.55 |
| 2026-08-02 12:00 |
02:03:57.54 |
+37:07:53.7 |
HIP 9770 |
22.76 |
| 2026-08-03 00:00 |
02:03:57.06 |
+37:08:09.9 |
HIP 9770 |
22.97 |
| 2026-08-03 12:00 |
02:03:56.55 |
+37:08:25.9 |
HIP 9770 |
23.18 |
| 2026-08-04 00:00 |
02:03:56.02 |
+37:08:41.8 |
HIP 9507 |
23.28 |
| 2026-08-04 12:00 |
02:03:55.46 |
+37:08:57.6 |
HIP 9507 |
23.04 |
| 2026-08-05 00:00 |
02:03:54.87 |
+37:09:13.3 |
HIP 9507 |
22.80 |
| 2026-08-05 12:00 |
02:03:54.26 |
+37:09:28.8 |
HIP 9507 |
22.55 |
| 2026-08-06 00:00 |
02:03:53.62 |
+37:09:44.2 |
HIP 9507 |
22.31 |
| 2026-08-06 12:00 |
02:03:52.95 |
+37:09:59.5 |
HIP 9507 |
22.06 |
| 2026-08-07 00:00 |
02:03:52.25 |
+37:10:14.7 |
HIP 9507 |
21.81 |
| 2026-08-07 12:00 |
02:03:51.53 |
+37:10:29.7 |
HIP 9507 |
21.55 |
| 2026-08-08 00:00 |
02:03:50.78 |
+37:10:44.6 |
HIP 9507 |
21.30 |
| 2026-08-08 12:00 |
02:03:50.00 |
+37:10:59.3 |
HIP 9507 |
21.04 |
| 2026-08-09 00:00 |
02:03:49.19 |
+37:11:14.0 |
HIP 9507 |
20.77 |
| 2026-08-09 12:00 |
02:03:48.36 |
+37:11:28.5 |
HIP 9507 |
20.51 |
| 2026-08-10 00:00 |
02:03:47.50 |
+37:11:42.8 |
HIP 9507 |
20.24 |
| 2026-08-10 12:00 |
02:03:46.61 |
+37:11:57.0 |
HIP 9507 |
19.97 |
| 2026-08-11 00:00 |
02:03:45.69 |
+37:12:11.1 |
HIP 9507 |
19.70 |
| 2026-08-11 12:00 |
02:03:44.75 |
+37:12:25.1 |
HIP 9507 |
19.42 |
| 2026-08-12 00:00 |
02:03:43.78 |
+37:12:38.9 |
HIP 9507 |
19.14 |
| 2026-08-12 12:00 |
02:03:42.78 |
+37:12:52.5 |
HIP 9507 |
18.86 |
| 2026-08-13 00:00 |
02:03:41.76 |
+37:13:06.0 |
HIP 9507 |
18.58 |
| 2026-08-13 12:00 |
02:03:40.71 |
+37:13:19.4 |
HIP 9507 |
18.29 |
| 2026-08-14 00:00 |
02:03:39.63 |
+37:13:32.6 |
HIP 9507 |
18.00 |
| 2026-08-14 12:00 |
02:03:38.53 |
+37:13:45.7 |
HIP 9507 |
17.70 |
| 2026-08-15 00:00 |
02:03:37.39 |
+37:13:58.6 |
HIP 9507 |
17.40 |
| 2026-08-15 12:00 |
02:03:36.24 |
+37:14:11.4 |
HIP 9507 |
17.10 |
| 2026-08-16 00:00 |
02:03:35.05 |
+37:14:24.0 |
HIP 9507 |
16.80 |
| 2026-08-16 12:00 |
02:03:33.84 |
+37:14:36.5 |
HIP 9507 |
16.49 |
| 2026-08-17 00:00 |
02:03:32.60 |
+37:14:48.8 |
HIP 9507 |
16.18 |
| 2026-08-17 12:00 |
02:03:31.33 |
+37:15:01.0 |
HIP 9507 |
15.87 |
| 2026-08-18 00:00 |
02:03:30.04 |
+37:15:13.0 |
HIP 9507 |
15.55 |
| 2026-08-18 12:00 |
02:03:28.72 |
+37:15:24.9 |
HIP 9507 |
15.23 |
| 2026-08-19 00:00 |
02:03:27.38 |
+37:15:36.6 |
HIP 9507 |
14.91 |