メタデータ
| 項目 |
値 |
| Designation |
C/2006 A1 (Pojmanski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-22T04:21:22.887360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
600 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
16.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-03-24.0000000 |
| e |
0.99976626 |
| q (au) |
0.555396 |
| a (au) |
2376.082997 |
| i (deg) |
92.736122 |
| Ω (om, deg) |
211.343233 |
| ω (w, deg) |
351.187789 |
| M (ma, deg) |
0.000254 |
等級
散乱 + 全体線形
$$
M_a = (9.583 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.583 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2006-01-04 |
2006-01-23 |
+11.6706 |
+1.828 |
| 2006-01-23 |
2006-02-21 |
-6.7238 |
-1.282 |
| 2006-02-22 |
2006-04-26 |
-8.0722 |
-1.039 |
| 2006-04-26 |
2006-12-12 |
-5.5681 |
-0.447 |
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 |
01:28:50.83 |
+33:31:31.4 |
HIP 7012 |
29.86 |
| 2026-09-20 12:00 |
01:28:47.96 |
+33:31:25.0 |
HIP 7012 |
30.15 |
| 2026-09-21 00:00 |
01:28:45.08 |
+33:31:18.5 |
HIP 7012 |
30.44 |
| 2026-09-21 12:00 |
01:28:42.19 |
+33:31:11.7 |
HIP 7012 |
30.74 |
| 2026-09-22 00:00 |
01:28:39.28 |
+33:31:04.7 |
HIP 7012 |
31.05 |
| 2026-09-22 12:00 |
01:28:36.36 |
+33:30:57.5 |
HIP 7012 |
31.36 |
| 2026-09-23 00:00 |
01:28:33.44 |
+33:30:50.2 |
HIP 7012 |
31.69 |
| 2026-09-23 12:00 |
01:28:30.50 |
+33:30:42.6 |
HIP 7012 |
32.02 |
| 2026-09-24 00:00 |
01:28:27.54 |
+33:30:34.9 |
HIP 7012 |
32.36 |
| 2026-09-24 12:00 |
01:28:24.58 |
+33:30:26.9 |
HIP 7012 |
32.71 |
| 2026-09-25 00:00 |
01:28:21.61 |
+33:30:18.8 |
HIP 7012 |
33.07 |
| 2026-09-25 12:00 |
01:28:18.62 |
+33:30:10.5 |
HIP 7012 |
33.43 |
| 2026-09-26 00:00 |
01:28:15.63 |
+33:30:01.9 |
HIP 7012 |
33.81 |
| 2026-09-26 12:00 |
01:28:12.63 |
+33:29:53.2 |
HIP 7012 |
34.19 |
| 2026-09-27 00:00 |
01:28:09.61 |
+33:29:44.3 |
HIP 7012 |
34.57 |
| 2026-09-27 12:00 |
01:28:06.59 |
+33:29:35.2 |
HIP 7012 |
34.97 |
| 2026-09-28 00:00 |
01:28:03.56 |
+33:29:25.9 |
HIP 7012 |
35.37 |
| 2026-09-28 12:00 |
01:28:00.51 |
+33:29:16.4 |
HIP 7012 |
35.78 |
| 2026-09-29 00:00 |
01:27:57.46 |
+33:29:06.8 |
HIP 7012 |
36.20 |
| 2026-09-29 12:00 |
01:27:54.40 |
+33:28:56.9 |
HIP 7012 |
36.62 |
| 2026-09-30 00:00 |
01:27:51.33 |
+33:28:46.8 |
HIP 7012 |
37.05 |
| 2026-09-30 12:00 |
01:27:48.26 |
+33:28:36.6 |
HIP 7012 |
37.48 |
| 2026-10-01 00:00 |
01:27:45.17 |
+33:28:26.2 |
HIP 7012 |
37.93 |
| 2026-10-01 12:00 |
01:27:42.08 |
+33:28:15.6 |
HIP 7012 |
38.38 |
| 2026-10-02 00:00 |
01:27:38.98 |
+33:28:04.8 |
HIP 7012 |
38.83 |
| 2026-10-02 12:00 |
01:27:35.87 |
+33:27:53.8 |
HIP 7012 |
39.29 |
| 2026-10-03 00:00 |
01:27:32.76 |
+33:27:42.6 |
HIP 7012 |
39.76 |
| 2026-10-03 12:00 |
01:27:29.63 |
+33:27:31.2 |
HIP 7012 |
40.23 |
| 2026-10-04 00:00 |
01:27:26.51 |
+33:27:19.7 |
HIP 7012 |
40.71 |
| 2026-10-04 12:00 |
01:27:23.37 |
+33:27:07.9 |
HIP 7012 |
41.19 |
| 2026-10-05 00:00 |
01:27:20.23 |
+33:26:56.0 |
HIP 7012 |
41.68 |
| 2026-10-05 12:00 |
01:27:17.08 |
+33:26:43.9 |
HIP 6594 |
41.14 |
| 2026-10-06 00:00 |
01:27:13.93 |
+33:26:31.6 |
HIP 6594 |
40.50 |
| 2026-10-06 12:00 |
01:27:10.77 |
+33:26:19.2 |
HIP 6594 |
39.85 |
| 2026-10-07 00:00 |
01:27:07.61 |
+33:26:06.5 |
HIP 6594 |
39.20 |
| 2026-10-07 12:00 |
01:27:04.44 |
+33:25:53.7 |
HIP 6594 |
38.55 |
| 2026-10-08 00:00 |
01:27:01.27 |
+33:25:40.7 |
HIP 6594 |
37.90 |
| 2026-10-08 12:00 |
01:26:58.09 |
+33:25:27.5 |
HIP 6594 |
37.25 |
| 2026-10-09 00:00 |
01:26:54.91 |
+33:25:14.1 |
HIP 6594 |
36.60 |
| 2026-10-09 12:00 |
01:26:51.72 |
+33:25:00.6 |
HIP 6594 |
35.95 |
| 2026-10-10 00:00 |
01:26:48.53 |
+33:24:46.9 |
HIP 6594 |
35.30 |
| 2026-10-10 12:00 |
01:26:45.34 |
+33:24:33.0 |
HIP 6594 |
34.64 |
| 2026-10-11 00:00 |
01:26:42.15 |
+33:24:18.9 |
HIP 6594 |
33.99 |