C/2009 W2 (Boattini)
メタデータ
| 項目 |
値 |
| Designation |
C/2009 W2 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-05-01T16:06:03.297600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:37Z |
| Obs used |
93 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-12-12.0000000 |
| e |
0.99955388 |
| q (au) |
6.907134 |
| a (au) |
15482.794125 |
| i (deg) |
164.490524 |
| Ω (om, deg) |
199.580074 |
| ω (w, deg) |
121.325958 |
| M (ma, deg) |
359.999928 |
等級
散乱 + 全体線形
$$
M_a = (6.864 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.864 |
| n |
6.000 |
| gf |
0.985 |
| gb |
-0.810 |
| k |
0.829 |
| δ90 |
7.095 |
| 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) |
| 2026-02-03 00:00 |
21:32:48.38 |
-28:48:12.2 |
HIP 106540 |
24.88 |
| 2026-02-03 12:00 |
21:32:52.07 |
-28:47:55.7 |
HIP 106540 |
24.15 |
| 2026-02-04 00:00 |
21:32:55.76 |
-28:47:39.4 |
HIP 106540 |
23.42 |
| 2026-02-04 12:00 |
21:32:59.45 |
-28:47:23.1 |
HIP 106540 |
22.71 |
| 2026-02-05 00:00 |
21:33:03.15 |
-28:47:07.0 |
HIP 106540 |
22.00 |
| 2026-02-05 12:00 |
21:33:06.85 |
-28:46:51.0 |
HIP 106540 |
21.30 |
| 2026-02-06 00:00 |
21:33:10.55 |
-28:46:35.0 |
HIP 106540 |
20.62 |
| 2026-02-06 12:00 |
21:33:14.25 |
-28:46:19.2 |
HIP 106540 |
19.94 |
| 2026-02-07 00:00 |
21:33:17.96 |
-28:46:03.5 |
HIP 106540 |
19.28 |
| 2026-02-07 12:00 |
21:33:21.66 |
-28:45:47.9 |
HIP 106540 |
18.64 |
| 2026-02-08 00:00 |
21:33:25.37 |
-28:45:32.5 |
HIP 106540 |
18.01 |
| 2026-02-08 12:00 |
21:33:29.08 |
-28:45:17.1 |
HIP 106540 |
17.39 |
| 2026-02-09 00:00 |
21:33:32.78 |
-28:45:01.8 |
HIP 106540 |
16.80 |
| 2026-02-09 12:00 |
21:33:36.49 |
-28:44:46.7 |
HIP 106540 |
16.23 |
| 2026-02-10 00:00 |
21:33:40.20 |
-28:44:31.7 |
HIP 106540 |
15.68 |
| 2026-02-10 12:00 |
21:33:43.91 |
-28:44:16.8 |
HIP 106540 |
15.16 |
| 2026-02-11 00:00 |
21:33:47.62 |
-28:44:02.0 |
HIP 106540 |
14.67 |
| 2026-02-11 12:00 |
21:33:51.32 |
-28:43:47.3 |
HIP 106540 |
14.21 |
| 2026-02-12 00:00 |
21:33:55.03 |
-28:43:32.8 |
HIP 106540 |
13.79 |
| 2026-02-12 12:00 |
21:33:58.73 |
-28:43:18.4 |
HIP 106540 |
13.40 |
| 2026-02-13 00:00 |
21:34:02.43 |
-28:43:04.1 |
HIP 106540 |
13.06 |
| 2026-02-13 12:00 |
21:34:06.13 |
-28:42:49.9 |
HIP 106540 |
12.76 |
| 2026-02-14 00:00 |
21:34:09.83 |
-28:42:35.9 |
HIP 106540 |
12.52 |
| 2026-02-14 12:00 |
21:34:13.52 |
-28:42:22.0 |
HIP 106540 |
12.32 |
| 2026-02-15 00:00 |
21:34:17.22 |
-28:42:08.2 |
HIP 106540 |
12.17 |
| 2026-02-15 12:00 |
21:34:20.90 |
-28:41:54.6 |
HIP 106540 |
12.09 |
| 2026-02-16 00:00 |
21:34:24.59 |
-28:41:41.1 |
HIP 106540 |
12.05 |
| 2026-02-16 12:00 |
21:34:28.27 |
-28:41:27.7 |
HIP 106540 |
12.08 |
| 2026-02-17 00:00 |
21:34:31.94 |
-28:41:14.5 |
HIP 106540 |
12.16 |
| 2026-02-17 12:00 |
21:34:35.62 |
-28:41:01.4 |
HIP 106540 |
12.29 |
| 2026-02-18 00:00 |
21:34:39.28 |
-28:40:48.4 |
HIP 106540 |
12.47 |
| 2026-02-18 12:00 |
21:34:42.94 |
-28:40:35.6 |
HIP 106540 |
12.71 |
| 2026-02-19 00:00 |
21:34:46.60 |
-28:40:22.9 |
HIP 106540 |
12.99 |
| 2026-02-19 12:00 |
21:34:50.25 |
-28:40:10.4 |
HIP 106540 |
13.32 |
| 2026-02-20 00:00 |
21:34:53.89 |
-28:39:58.0 |
HIP 106540 |
13.68 |
| 2026-02-20 12:00 |
21:34:57.53 |
-28:39:45.7 |
HIP 106540 |
14.08 |
| 2026-02-21 00:00 |
21:35:01.16 |
-28:39:33.6 |
HIP 106540 |
14.51 |
| 2026-02-21 12:00 |
21:35:04.78 |
-28:39:21.7 |
HIP 106540 |
14.98 |
| 2026-02-22 00:00 |
21:35:08.40 |
-28:39:09.8 |
HIP 106540 |
15.46 |
| 2026-02-22 12:00 |
21:35:12.01 |
-28:38:58.2 |
HIP 106540 |
15.98 |
| 2026-02-23 00:00 |
21:35:15.61 |
-28:38:46.7 |
HIP 106540 |
16.51 |
| 2026-02-23 12:00 |
21:35:19.20 |
-28:38:35.3 |
HIP 106540 |
17.07 |
| 2026-02-24 00:00 |
21:35:22.78 |
-28:38:24.1 |
HIP 106540 |
17.64 |