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) |
| 2026-09-20 00:00 |
08:33:34.29 |
-10:42:40.0 |
HIP 42015 |
15.76 |
| 2026-09-20 12:00 |
08:33:35.87 |
-10:43:03.3 |
HIP 42015 |
15.28 |
| 2026-09-21 00:00 |
08:33:37.44 |
-10:43:26.7 |
HIP 42015 |
14.81 |
| 2026-09-21 12:00 |
08:33:38.98 |
-10:43:50.1 |
HIP 42015 |
14.35 |
| 2026-09-22 00:00 |
08:33:40.50 |
-10:44:13.6 |
HIP 42015 |
13.89 |
| 2026-09-22 12:00 |
08:33:42.01 |
-10:44:37.1 |
HIP 42015 |
13.44 |
| 2026-09-23 00:00 |
08:33:43.49 |
-10:45:00.7 |
HIP 42015 |
13.00 |
| 2026-09-23 12:00 |
08:33:44.95 |
-10:45:24.4 |
HIP 42015 |
12.56 |
| 2026-09-24 00:00 |
08:33:46.39 |
-10:45:48.0 |
HIP 42015 |
12.12 |
| 2026-09-24 12:00 |
08:33:47.82 |
-10:46:11.8 |
HIP 42015 |
11.70 |
| 2026-09-25 00:00 |
08:33:49.22 |
-10:46:35.6 |
HIP 42015 |
11.29 |
| 2026-09-25 12:00 |
08:33:50.60 |
-10:46:59.4 |
HIP 42015 |
10.88 |
| 2026-09-26 00:00 |
08:33:51.95 |
-10:47:23.2 |
HIP 42015 |
10.48 |
| 2026-09-26 12:00 |
08:33:53.29 |
-10:47:47.1 |
HIP 42015 |
10.09 |
| 2026-09-27 00:00 |
08:33:54.61 |
-10:48:11.1 |
HIP 42015 |
9.72 |
| 2026-09-27 12:00 |
08:33:55.90 |
-10:48:35.1 |
HIP 42015 |
9.35 |
| 2026-09-28 00:00 |
08:33:57.18 |
-10:48:59.1 |
HIP 42015 |
9.00 |
| 2026-09-28 12:00 |
08:33:58.43 |
-10:49:23.1 |
HIP 42015 |
8.66 |
| 2026-09-29 00:00 |
08:33:59.66 |
-10:49:47.2 |
HIP 42015 |
8.34 |
| 2026-09-29 12:00 |
08:34:00.87 |
-10:50:11.3 |
HIP 42015 |
8.03 |
| 2026-09-30 00:00 |
08:34:02.05 |
-10:50:35.5 |
HIP 42015 |
7.75 |
| 2026-09-30 12:00 |
08:34:03.21 |
-10:50:59.7 |
HIP 42015 |
7.48 |
| 2026-10-01 00:00 |
08:34:04.36 |
-10:51:23.9 |
HIP 42015 |
7.23 |
| 2026-10-01 12:00 |
08:34:05.47 |
-10:51:48.1 |
HIP 42015 |
7.00 |
| 2026-10-02 00:00 |
08:34:06.57 |
-10:52:12.3 |
HIP 42015 |
6.80 |
| 2026-10-02 12:00 |
08:34:07.65 |
-10:52:36.6 |
HIP 42015 |
6.62 |
| 2026-10-03 00:00 |
08:34:08.70 |
-10:53:00.9 |
HIP 42015 |
6.47 |
| 2026-10-03 12:00 |
08:34:09.72 |
-10:53:25.2 |
HIP 42015 |
6.35 |
| 2026-10-04 00:00 |
08:34:10.73 |
-10:53:49.6 |
HIP 42015 |
6.26 |
| 2026-10-04 12:00 |
08:34:11.71 |
-10:54:13.9 |
HIP 42015 |
6.20 |
| 2026-10-05 00:00 |
08:34:12.67 |
-10:54:38.3 |
HIP 42015 |
6.17 |
| 2026-10-05 12:00 |
08:34:13.60 |
-10:55:02.6 |
HIP 42015 |
6.18 |
| 2026-10-06 00:00 |
08:34:14.52 |
-10:55:27.0 |
HIP 42015 |
6.21 |
| 2026-10-06 12:00 |
08:34:15.40 |
-10:55:51.4 |
HIP 42015 |
6.26 |
| 2026-10-07 00:00 |
08:34:16.27 |
-10:56:15.8 |
HIP 42015 |
6.35 |
| 2026-10-07 12:00 |
08:34:17.11 |
-10:56:40.2 |
HIP 42015 |
6.46 |
| 2026-10-08 00:00 |
08:34:17.92 |
-10:57:04.6 |
HIP 42015 |
6.60 |
| 2026-10-08 12:00 |
08:34:18.72 |
-10:57:29.0 |
HIP 42015 |
6.76 |
| 2026-10-09 00:00 |
08:34:19.48 |
-10:57:53.4 |
HIP 42015 |
6.93 |
| 2026-10-09 12:00 |
08:34:20.23 |
-10:58:17.8 |
HIP 42015 |
7.13 |
| 2026-10-10 00:00 |
08:34:20.94 |
-10:58:42.2 |
HIP 42015 |
7.34 |
| 2026-10-10 12:00 |
08:34:21.64 |
-10:59:06.5 |
HIP 42015 |
7.57 |
| 2026-10-11 00:00 |
08:34:22.31 |
-10:59:30.9 |
HIP 42015 |
7.80 |