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
$$
M_a = (7.964 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.964 |
| n |
6.000 |
| gf |
0.949 |
| gb |
-0.773 |
| k |
0.971 |
| δ90 |
9.981 |
| 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) |
| 2026-05-12 00:00 |
08:24:16.00 |
-10:26:56.3 |
HIP 41203 |
4.88 |
| 2026-05-12 12:00 |
08:24:16.63 |
-10:26:36.2 |
HIP 41203 |
5.02 |
| 2026-05-13 00:00 |
08:24:17.28 |
-10:26:16.3 |
HIP 41203 |
5.19 |
| 2026-05-13 12:00 |
08:24:17.95 |
-10:25:56.6 |
HIP 41203 |
5.36 |
| 2026-05-14 00:00 |
08:24:18.65 |
-10:25:36.9 |
HIP 41203 |
5.56 |
| 2026-05-14 12:00 |
08:24:19.38 |
-10:25:17.5 |
HIP 41203 |
5.76 |
| 2026-05-15 00:00 |
08:24:20.13 |
-10:24:58.2 |
HIP 41203 |
5.98 |
| 2026-05-15 12:00 |
08:24:20.90 |
-10:24:39.0 |
HIP 41203 |
6.20 |
| 2026-05-16 00:00 |
08:24:21.70 |
-10:24:20.0 |
HIP 41203 |
6.44 |
| 2026-05-16 12:00 |
08:24:22.52 |
-10:24:01.2 |
HIP 41203 |
6.68 |
| 2026-05-17 00:00 |
08:24:23.36 |
-10:23:42.5 |
HIP 41203 |
6.93 |
| 2026-05-17 12:00 |
08:24:24.23 |
-10:23:24.0 |
HIP 41203 |
7.19 |
| 2026-05-18 00:00 |
08:24:25.13 |
-10:23:05.6 |
HIP 41203 |
7.45 |
| 2026-05-18 12:00 |
08:24:26.05 |
-10:22:47.4 |
HIP 41203 |
7.73 |
| 2026-05-19 00:00 |
08:24:26.99 |
-10:22:29.4 |
HIP 41203 |
8.00 |
| 2026-05-19 12:00 |
08:24:27.95 |
-10:22:11.5 |
HIP 41203 |
8.28 |
| 2026-05-20 00:00 |
08:24:28.94 |
-10:21:53.8 |
HIP 41203 |
8.57 |
| 2026-05-20 12:00 |
08:24:29.95 |
-10:21:36.2 |
HIP 41203 |
8.86 |
| 2026-05-21 00:00 |
08:24:30.98 |
-10:21:18.8 |
HIP 41203 |
9.15 |
| 2026-05-21 12:00 |
08:24:32.04 |
-10:21:01.6 |
HIP 41203 |
9.45 |
| 2026-05-22 00:00 |
08:24:33.12 |
-10:20:44.5 |
HIP 41203 |
9.76 |
| 2026-05-22 12:00 |
08:24:34.22 |
-10:20:27.7 |
HIP 41203 |
10.06 |
| 2026-05-23 00:00 |
08:24:35.35 |
-10:20:11.0 |
HIP 41203 |
10.37 |
| 2026-05-23 12:00 |
08:24:36.49 |
-10:19:54.4 |
HIP 41203 |
10.69 |
| 2026-05-24 00:00 |
08:24:37.66 |
-10:19:38.0 |
HIP 41203 |
11.00 |
| 2026-05-24 12:00 |
08:24:38.85 |
-10:19:21.8 |
HIP 41203 |
11.32 |
| 2026-05-25 00:00 |
08:24:40.07 |
-10:19:05.8 |
HIP 41203 |
11.65 |
| 2026-05-25 12:00 |
08:24:41.30 |
-10:18:50.0 |
HIP 41203 |
11.97 |
| 2026-05-26 00:00 |
08:24:42.56 |
-10:18:34.3 |
HIP 41203 |
12.30 |
| 2026-05-26 12:00 |
08:24:43.84 |
-10:18:18.8 |
HIP 41203 |
12.64 |
| 2026-05-27 00:00 |
08:24:45.14 |
-10:18:03.5 |
HIP 41203 |
12.97 |
| 2026-05-27 12:00 |
08:24:46.46 |
-10:17:48.3 |
HIP 41203 |
13.31 |
| 2026-05-28 00:00 |
08:24:47.80 |
-10:17:33.3 |
HIP 41203 |
13.65 |
| 2026-05-28 12:00 |
08:24:49.17 |
-10:17:18.5 |
HIP 41203 |
14.00 |
| 2026-05-29 00:00 |
08:24:50.55 |
-10:17:03.9 |
HIP 41203 |
14.34 |
| 2026-05-29 12:00 |
08:24:51.96 |
-10:16:49.5 |
HIP 41203 |
14.69 |
| 2026-05-30 00:00 |
08:24:53.38 |
-10:16:35.2 |
HIP 41203 |
15.05 |
| 2026-05-30 12:00 |
08:24:54.83 |
-10:16:21.1 |
HIP 41203 |
15.40 |
| 2026-05-31 00:00 |
08:24:56.30 |
-10:16:07.2 |
HIP 41205 |
15.67 |
| 2026-05-31 12:00 |
08:24:57.78 |
-10:15:53.5 |
HIP 41205 |
15.61 |
| 2026-06-01 00:00 |
08:24:59.29 |
-10:15:40.0 |
HIP 41205 |
15.57 |
| 2026-06-01 12:00 |
08:25:00.82 |
-10:15:26.7 |
HIP 41205 |
15.54 |
| 2026-06-02 00:00 |
08:25:02.37 |
-10:15:13.5 |
HIP 41205 |
15.53 |