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
$$
M_a = (6.856 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.856 |
| n |
6.000 |
| gf |
0.991 |
| gb |
-0.810 |
| k |
0.831 |
| δ90 |
7.006 |
| 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 |
21:25:00.36 |
-30:19:44.2 |
HIP 105873 |
21.05 |
| 2026-09-20 12:00 |
21:24:56.53 |
-30:19:51.0 |
HIP 105598 |
21.30 |
| 2026-09-21 00:00 |
21:24:52.72 |
-30:19:57.7 |
HIP 105598 |
20.52 |
| 2026-09-21 12:00 |
21:24:48.94 |
-30:20:04.1 |
HIP 105598 |
19.75 |
| 2026-09-22 00:00 |
21:24:45.18 |
-30:20:10.3 |
HIP 105598 |
18.98 |
| 2026-09-22 12:00 |
21:24:41.45 |
-30:20:16.3 |
HIP 105598 |
18.23 |
| 2026-09-23 00:00 |
21:24:37.74 |
-30:20:22.1 |
HIP 105598 |
17.48 |
| 2026-09-23 12:00 |
21:24:34.06 |
-30:20:27.7 |
HIP 105598 |
16.74 |
| 2026-09-24 00:00 |
21:24:30.41 |
-30:20:33.1 |
HIP 105598 |
16.02 |
| 2026-09-24 12:00 |
21:24:26.78 |
-30:20:38.3 |
HIP 105598 |
15.30 |
| 2026-09-25 00:00 |
21:24:23.18 |
-30:20:43.3 |
HIP 105598 |
14.60 |
| 2026-09-25 12:00 |
21:24:19.60 |
-30:20:48.0 |
HIP 105598 |
13.91 |
| 2026-09-26 00:00 |
21:24:16.06 |
-30:20:52.6 |
HIP 105598 |
13.23 |
| 2026-09-26 12:00 |
21:24:12.54 |
-30:20:57.0 |
HIP 105598 |
12.57 |
| 2026-09-27 00:00 |
21:24:09.05 |
-30:21:01.1 |
HIP 105598 |
11.92 |
| 2026-09-27 12:00 |
21:24:05.58 |
-30:21:05.1 |
HIP 105598 |
11.29 |
| 2026-09-28 00:00 |
21:24:02.15 |
-30:21:08.8 |
HIP 105598 |
10.68 |
| 2026-09-28 12:00 |
21:23:58.74 |
-30:21:12.3 |
HIP 105598 |
10.09 |
| 2026-09-29 00:00 |
21:23:55.36 |
-30:21:15.7 |
HIP 105598 |
9.52 |
| 2026-09-29 12:00 |
21:23:52.01 |
-30:21:18.8 |
HIP 105598 |
8.98 |
| 2026-09-30 00:00 |
21:23:48.69 |
-30:21:21.7 |
HIP 105598 |
8.47 |
| 2026-09-30 12:00 |
21:23:45.40 |
-30:21:24.4 |
HIP 105598 |
8.00 |
| 2026-10-01 00:00 |
21:23:42.13 |
-30:21:26.9 |
HIP 105598 |
7.56 |
| 2026-10-01 12:00 |
21:23:38.90 |
-30:21:29.2 |
HIP 105598 |
7.17 |
| 2026-10-02 00:00 |
21:23:35.70 |
-30:21:31.3 |
HIP 105598 |
6.82 |
| 2026-10-02 12:00 |
21:23:32.52 |
-30:21:33.2 |
HIP 105598 |
6.53 |
| 2026-10-03 00:00 |
21:23:29.38 |
-30:21:34.9 |
HIP 105598 |
6.31 |
| 2026-10-03 12:00 |
21:23:26.27 |
-30:21:36.4 |
HIP 105598 |
6.14 |
| 2026-10-04 00:00 |
21:23:23.19 |
-30:21:37.7 |
HIP 105598 |
6.05 |
| 2026-10-04 12:00 |
21:23:20.13 |
-30:21:38.8 |
HIP 105598 |
6.02 |
| 2026-10-05 00:00 |
21:23:17.11 |
-30:21:39.7 |
HIP 105598 |
6.06 |
| 2026-10-05 12:00 |
21:23:14.12 |
-30:21:40.3 |
HIP 105598 |
6.17 |
| 2026-10-06 00:00 |
21:23:11.17 |
-30:21:40.8 |
HIP 105598 |
6.33 |
| 2026-10-06 12:00 |
21:23:08.24 |
-30:21:41.1 |
HIP 105598 |
6.55 |
| 2026-10-07 00:00 |
21:23:05.35 |
-30:21:41.1 |
HIP 105598 |
6.82 |
| 2026-10-07 12:00 |
21:23:02.48 |
-30:21:41.0 |
HIP 105598 |
7.12 |
| 2026-10-08 00:00 |
21:22:59.65 |
-30:21:40.7 |
HIP 105598 |
7.45 |
| 2026-10-08 12:00 |
21:22:56.86 |
-30:21:40.1 |
HIP 105598 |
7.81 |
| 2026-10-09 00:00 |
21:22:54.09 |
-30:21:39.4 |
HIP 105598 |
8.19 |
| 2026-10-09 12:00 |
21:22:51.36 |
-30:21:38.4 |
HIP 105598 |
8.59 |
| 2026-10-10 00:00 |
21:22:48.66 |
-30:21:37.3 |
HIP 105598 |
9.01 |
| 2026-10-10 12:00 |
21:22:46.00 |
-30:21:35.9 |
HIP 105598 |
9.43 |
| 2026-10-11 00:00 |
21:22:43.37 |
-30:21:34.4 |
HIP 105598 |
9.86 |