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) |
| 2026-03-26 00:00 |
21:38:32.52 |
-28:32:20.3 |
HIP 106719 |
20.70 |
| 2026-03-26 12:00 |
21:38:35.10 |
-28:32:19.8 |
HIP 106719 |
21.25 |
| 2026-03-27 00:00 |
21:38:37.66 |
-28:32:19.6 |
HIP 106719 |
21.81 |
| 2026-03-27 12:00 |
21:38:40.19 |
-28:32:19.5 |
HIP 106719 |
22.35 |
| 2026-03-28 00:00 |
21:38:42.70 |
-28:32:19.7 |
HIP 106719 |
22.89 |
| 2026-03-28 12:00 |
21:38:45.19 |
-28:32:20.0 |
HIP 106719 |
23.43 |
| 2026-03-29 00:00 |
21:38:47.64 |
-28:32:20.5 |
HIP 106719 |
23.96 |
| 2026-03-29 12:00 |
21:38:50.08 |
-28:32:21.3 |
HIP 106719 |
24.48 |
| 2026-03-30 00:00 |
21:38:52.49 |
-28:32:22.2 |
HIP 106719 |
25.00 |
| 2026-03-30 12:00 |
21:38:54.87 |
-28:32:23.3 |
HIP 106719 |
25.51 |
| 2026-03-31 00:00 |
21:38:57.23 |
-28:32:24.6 |
HIP 106719 |
26.02 |
| 2026-03-31 12:00 |
21:38:59.57 |
-28:32:26.1 |
HIP 106719 |
26.52 |
| 2026-04-01 00:00 |
21:39:01.87 |
-28:32:27.8 |
HIP 106719 |
27.02 |
| 2026-04-01 12:00 |
21:39:04.15 |
-28:32:29.7 |
HIP 106719 |
27.51 |
| 2026-04-02 00:00 |
21:39:06.41 |
-28:32:31.9 |
HIP 106719 |
27.99 |
| 2026-04-02 12:00 |
21:39:08.64 |
-28:32:34.2 |
HIP 106719 |
28.47 |
| 2026-04-03 00:00 |
21:39:10.84 |
-28:32:36.7 |
HIP 106719 |
28.95 |
| 2026-04-03 12:00 |
21:39:13.02 |
-28:32:39.4 |
HIP 106719 |
29.41 |
| 2026-04-04 00:00 |
21:39:15.17 |
-28:32:42.2 |
HIP 106719 |
29.88 |
| 2026-04-04 12:00 |
21:39:17.29 |
-28:32:45.3 |
HIP 106719 |
30.33 |
| 2026-04-05 00:00 |
21:39:19.38 |
-28:32:48.6 |
HIP 106719 |
30.78 |
| 2026-04-05 12:00 |
21:39:21.45 |
-28:32:52.1 |
HIP 106719 |
31.22 |
| 2026-04-06 00:00 |
21:39:23.49 |
-28:32:55.8 |
HIP 106719 |
31.66 |
| 2026-04-06 12:00 |
21:39:25.50 |
-28:32:59.7 |
HIP 106719 |
32.09 |
| 2026-04-07 00:00 |
21:39:27.49 |
-28:33:03.8 |
HIP 106719 |
32.52 |
| 2026-04-07 12:00 |
21:39:29.44 |
-28:33:08.1 |
HIP 106719 |
32.94 |
| 2026-04-08 00:00 |
21:39:31.37 |
-28:33:12.6 |
HIP 106719 |
33.35 |
| 2026-04-08 12:00 |
21:39:33.27 |
-28:33:17.2 |
HIP 106719 |
33.76 |
| 2026-04-09 00:00 |
21:39:35.14 |
-28:33:22.1 |
HIP 106719 |
34.16 |
| 2026-04-09 12:00 |
21:39:36.98 |
-28:33:27.2 |
HIP 106719 |
34.55 |
| 2026-04-10 00:00 |
21:39:38.79 |
-28:33:32.5 |
HIP 106719 |
34.94 |
| 2026-04-10 12:00 |
21:39:40.58 |
-28:33:38.0 |
HIP 106719 |
35.32 |
| 2026-04-11 00:00 |
21:39:42.33 |
-28:33:43.7 |
HIP 106719 |
35.70 |
| 2026-04-11 12:00 |
21:39:44.06 |
-28:33:49.5 |
HIP 106719 |
36.07 |
| 2026-04-12 00:00 |
21:39:45.75 |
-28:33:55.6 |
HIP 106719 |
36.43 |
| 2026-04-12 12:00 |
21:39:47.41 |
-28:34:01.9 |
HIP 106719 |
36.79 |
| 2026-04-13 00:00 |
21:39:49.05 |
-28:34:08.4 |
HIP 106719 |
37.14 |
| 2026-04-13 12:00 |
21:39:50.65 |
-28:34:15.1 |
HIP 106719 |
37.48 |
| 2026-04-14 00:00 |
21:39:52.23 |
-28:34:22.0 |
HIP 106719 |
37.82 |
| 2026-04-14 12:00 |
21:39:53.77 |
-28:34:29.0 |
HIP 106719 |
38.15 |
| 2026-04-15 00:00 |
21:39:55.28 |
-28:34:36.3 |
HIP 106719 |
38.48 |
| 2026-04-15 12:00 |
21:39:56.76 |
-28:34:43.8 |
HIP 106719 |
38.80 |
| 2026-04-16 00:00 |
21:39:58.21 |
-28:34:51.5 |
HIP 106719 |
39.11 |