メタデータ
| 項目 |
値 |
| Designation |
C/2006 U6 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-05T11:25:18.736320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:01Z |
| Obs used |
552 |
| NEO |
- |
| M1 |
10.900 |
| 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) |
2008-04-03.0000000 |
| e |
0.99870621 |
| q (au) |
2.498397 |
| a (au) |
1931.066467 |
| i (deg) |
84.878944 |
| Ω (om, deg) |
180.186317 |
| ω (w, deg) |
276.596980 |
| M (ma, deg) |
359.999263 |
等級
散乱 + 全体線形
$$
M_a = (13.450 + 2.405\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.450 |
| n |
2.405 |
| gf |
1.000 |
| gb |
-0.706 |
| k |
0.800 |
| 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 |
| 2006-09-15 |
2007-09-14 |
+2.5893 |
-1.956 |
| 2007-09-14 |
2008-05-08 |
-3.2129 |
+1.746 |
| 2008-06-11 |
2010-06-04 |
-0.0917 |
-0.202 |
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 |
15:00:10.09 |
+53:57:13.8 |
HIP 73368 |
7.38 |
| 2026-07-29 12:00 |
15:00:09.37 |
+53:56:32.2 |
HIP 73368 |
6.85 |
| 2026-07-30 00:00 |
15:00:08.69 |
+53:55:50.5 |
HIP 73368 |
6.35 |
| 2026-07-30 12:00 |
15:00:08.05 |
+53:55:08.6 |
HIP 73368 |
5.90 |
| 2026-07-31 00:00 |
15:00:07.46 |
+53:54:26.7 |
HIP 73368 |
5.52 |
| 2026-07-31 12:00 |
15:00:06.91 |
+53:53:44.7 |
HIP 73368 |
5.20 |
| 2026-08-01 00:00 |
15:00:06.40 |
+53:53:02.6 |
HIP 73366 |
4.91 |
| 2026-08-01 12:00 |
15:00:05.94 |
+53:52:20.4 |
HIP 73366 |
4.68 |
| 2026-08-02 00:00 |
15:00:05.52 |
+53:51:38.2 |
HIP 73366 |
4.56 |
| 2026-08-02 12:00 |
15:00:05.14 |
+53:50:55.8 |
HIP 73366 |
4.56 |
| 2026-08-03 00:00 |
15:00:04.81 |
+53:50:13.4 |
HIP 73366 |
4.67 |
| 2026-08-03 12:00 |
15:00:04.52 |
+53:49:30.9 |
HIP 73366 |
4.89 |
| 2026-08-04 00:00 |
15:00:04.27 |
+53:48:48.3 |
HIP 73366 |
5.21 |
| 2026-08-04 12:00 |
15:00:04.07 |
+53:48:05.7 |
HIP 73366 |
5.60 |
| 2026-08-05 00:00 |
15:00:03.91 |
+53:47:23.0 |
HIP 73366 |
6.05 |
| 2026-08-05 12:00 |
15:00:03.80 |
+53:46:40.2 |
HIP 73366 |
6.56 |
| 2026-08-06 00:00 |
15:00:03.73 |
+53:45:57.4 |
HIP 73366 |
7.11 |
| 2026-08-06 12:00 |
15:00:03.70 |
+53:45:14.5 |
HIP 73366 |
7.69 |
| 2026-08-07 00:00 |
15:00:03.71 |
+53:44:31.6 |
HIP 73366 |
8.29 |
| 2026-08-07 12:00 |
15:00:03.77 |
+53:43:48.6 |
HIP 73366 |
8.92 |
| 2026-08-08 00:00 |
15:00:03.88 |
+53:43:05.6 |
HIP 73366 |
9.56 |
| 2026-08-08 12:00 |
15:00:04.02 |
+53:42:22.5 |
HIP 73366 |
10.21 |
| 2026-08-09 00:00 |
15:00:04.21 |
+53:41:39.4 |
HIP 73366 |
10.88 |
| 2026-08-09 12:00 |
15:00:04.45 |
+53:40:56.2 |
HIP 73366 |
11.55 |
| 2026-08-10 00:00 |
15:00:04.73 |
+53:40:13.0 |
HIP 73366 |
12.24 |
| 2026-08-10 12:00 |
15:00:05.05 |
+53:39:29.8 |
HIP 73366 |
12.93 |
| 2026-08-11 00:00 |
15:00:05.41 |
+53:38:46.6 |
HIP 73366 |
13.62 |
| 2026-08-11 12:00 |
15:00:05.82 |
+53:38:03.3 |
HIP 73366 |
14.32 |
| 2026-08-12 00:00 |
15:00:06.28 |
+53:37:20.0 |
HIP 73366 |
15.03 |
| 2026-08-12 12:00 |
15:00:06.77 |
+53:36:36.7 |
HIP 73366 |
15.74 |
| 2026-08-13 00:00 |
15:00:07.31 |
+53:35:53.4 |
HIP 73548 |
15.74 |
| 2026-08-13 12:00 |
15:00:07.89 |
+53:35:10.0 |
HIP 73548 |
15.68 |
| 2026-08-14 00:00 |
15:00:08.52 |
+53:34:26.7 |
HIP 73548 |
15.64 |
| 2026-08-14 12:00 |
15:00:09.19 |
+53:33:43.3 |
HIP 73548 |
15.64 |
| 2026-08-15 00:00 |
15:00:09.90 |
+53:33:00.0 |
HIP 73548 |
15.66 |
| 2026-08-15 12:00 |
15:00:10.66 |
+53:32:16.6 |
HIP 73548 |
15.71 |
| 2026-08-16 00:00 |
15:00:11.45 |
+53:31:33.3 |
HIP 73548 |
15.78 |
| 2026-08-16 12:00 |
15:00:12.30 |
+53:30:50.0 |
HIP 73548 |
15.89 |
| 2026-08-17 00:00 |
15:00:13.18 |
+53:30:06.6 |
HIP 73548 |
16.02 |
| 2026-08-17 12:00 |
15:00:14.11 |
+53:29:23.3 |
HIP 73548 |
16.17 |
| 2026-08-18 00:00 |
15:00:15.08 |
+53:28:40.0 |
HIP 73548 |
16.35 |
| 2026-08-18 12:00 |
15:00:16.09 |
+53:27:56.8 |
HIP 73548 |
16.56 |
| 2026-08-19 00:00 |
15:00:17.14 |
+53:27:13.5 |
HIP 73548 |
16.79 |