メタデータ
| 項目 |
値 |
| Designation |
C/2006 M2 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-12-31T16:30:25.462080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
39 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-06-21.0000000 |
| e |
1.00240603 |
| q (au) |
5.313061 |
| a (au) |
-2208.224277 |
| i (deg) |
150.152651 |
| Ω (om, deg) |
27.284430 |
| ω (w, deg) |
120.496862 |
| M (ma, deg) |
0.001627 |
等級
散乱 + 全体線形
$$
M_a = (8.995 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.995 |
| n |
6.000 |
| gf |
0.958 |
| gb |
-0.767 |
| k |
0.914 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
08:29:28.05 |
-10:11:49.5 |
HIP 41662 |
13.58 |
| 2026-07-29 12:00 |
08:29:30.76 |
-10:11:59.0 |
HIP 41662 |
13.61 |
| 2026-07-30 00:00 |
08:29:33.47 |
-10:12:08.7 |
HIP 41662 |
13.66 |
| 2026-07-30 12:00 |
08:29:36.18 |
-10:12:18.6 |
HIP 41662 |
13.76 |
| 2026-07-31 00:00 |
08:29:38.88 |
-10:12:28.7 |
HIP 41662 |
13.89 |
| 2026-07-31 12:00 |
08:29:41.59 |
-10:12:39.0 |
HIP 41733 |
13.36 |
| 2026-08-01 00:00 |
08:29:44.29 |
-10:12:49.4 |
HIP 41733 |
12.71 |
| 2026-08-01 12:00 |
08:29:47.00 |
-10:13:00.0 |
HIP 41733 |
12.06 |
| 2026-08-02 00:00 |
08:29:49.70 |
-10:13:10.8 |
HIP 41733 |
11.42 |
| 2026-08-02 12:00 |
08:29:52.40 |
-10:13:21.8 |
HIP 41733 |
10.78 |
| 2026-08-03 00:00 |
08:29:55.09 |
-10:13:32.9 |
HIP 41733 |
10.15 |
| 2026-08-03 12:00 |
08:29:57.79 |
-10:13:44.2 |
HIP 41733 |
9.54 |
| 2026-08-04 00:00 |
08:30:00.48 |
-10:13:55.7 |
HIP 41733 |
8.93 |
| 2026-08-04 12:00 |
08:30:03.17 |
-10:14:07.4 |
HIP 41733 |
8.34 |
| 2026-08-05 00:00 |
08:30:05.85 |
-10:14:19.3 |
HIP 41733 |
7.77 |
| 2026-08-05 12:00 |
08:30:08.54 |
-10:14:31.3 |
HIP 41733 |
7.21 |
| 2026-08-06 00:00 |
08:30:11.21 |
-10:14:43.5 |
HIP 41733 |
6.69 |
| 2026-08-06 12:00 |
08:30:13.89 |
-10:14:55.9 |
HIP 41733 |
6.20 |
| 2026-08-07 00:00 |
08:30:16.56 |
-10:15:08.4 |
HIP 41733 |
5.76 |
| 2026-08-07 12:00 |
08:30:19.23 |
-10:15:21.1 |
HIP 41733 |
5.37 |
| 2026-08-08 00:00 |
08:30:21.89 |
-10:15:34.0 |
HIP 41733 |
5.04 |
| 2026-08-08 12:00 |
08:30:24.55 |
-10:15:47.1 |
HIP 41733 |
4.80 |
| 2026-08-09 00:00 |
08:30:27.21 |
-10:16:00.3 |
HIP 41733 |
4.65 |
| 2026-08-09 12:00 |
08:30:29.86 |
-10:16:13.7 |
HIP 41733 |
4.61 |
| 2026-08-10 00:00 |
08:30:32.50 |
-10:16:27.2 |
HIP 41733 |
4.67 |
| 2026-08-10 12:00 |
08:30:35.14 |
-10:16:41.0 |
HIP 41733 |
4.83 |
| 2026-08-11 00:00 |
08:30:37.78 |
-10:16:54.9 |
HIP 41733 |
5.08 |
| 2026-08-11 12:00 |
08:30:40.41 |
-10:17:08.9 |
HIP 41733 |
5.41 |
| 2026-08-12 00:00 |
08:30:43.03 |
-10:17:23.1 |
HIP 41733 |
5.81 |
| 2026-08-12 12:00 |
08:30:45.65 |
-10:17:37.5 |
HIP 41733 |
6.26 |
| 2026-08-13 00:00 |
08:30:48.26 |
-10:17:52.1 |
HIP 41733 |
6.75 |
| 2026-08-13 12:00 |
08:30:50.86 |
-10:18:06.8 |
HIP 41733 |
7.27 |
| 2026-08-14 00:00 |
08:30:53.46 |
-10:18:21.6 |
HIP 41733 |
7.82 |
| 2026-08-14 12:00 |
08:30:56.05 |
-10:18:36.6 |
HIP 41733 |
8.39 |
| 2026-08-15 00:00 |
08:30:58.64 |
-10:18:51.8 |
HIP 41733 |
8.98 |
| 2026-08-15 12:00 |
08:31:01.21 |
-10:19:07.2 |
HIP 41733 |
9.58 |
| 2026-08-16 00:00 |
08:31:03.78 |
-10:19:22.6 |
HIP 41733 |
10.20 |
| 2026-08-16 12:00 |
08:31:06.34 |
-10:19:38.3 |
HIP 41733 |
10.82 |
| 2026-08-17 00:00 |
08:31:08.90 |
-10:19:54.1 |
HIP 41733 |
11.45 |
| 2026-08-17 12:00 |
08:31:11.44 |
-10:20:10.0 |
HIP 41733 |
12.08 |
| 2026-08-18 00:00 |
08:31:13.98 |
-10:20:26.1 |
HIP 41733 |
12.72 |
| 2026-08-18 12:00 |
08:31:16.51 |
-10:20:42.4 |
HIP 41733 |
13.36 |
| 2026-08-19 00:00 |
08:31:19.03 |
-10:20:58.8 |
HIP 41733 |
14.01 |