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) |
| 2026-05-12 00:00 |
21:40:27.86 |
-28:45:55.3 |
HIP 107023 |
27.98 |
| 2026-05-12 12:00 |
21:40:27.51 |
-28:46:12.8 |
HIP 107023 |
27.69 |
| 2026-05-13 00:00 |
21:40:27.13 |
-28:46:30.5 |
HIP 107023 |
27.39 |
| 2026-05-13 12:00 |
21:40:26.71 |
-28:46:48.4 |
HIP 107023 |
27.10 |
| 2026-05-14 00:00 |
21:40:26.25 |
-28:47:06.5 |
HIP 107023 |
26.80 |
| 2026-05-14 12:00 |
21:40:25.76 |
-28:47:24.7 |
HIP 107023 |
26.50 |
| 2026-05-15 00:00 |
21:40:25.23 |
-28:47:43.1 |
HIP 107023 |
26.20 |
| 2026-05-15 12:00 |
21:40:24.66 |
-28:48:01.6 |
HIP 107023 |
25.90 |
| 2026-05-16 00:00 |
21:40:24.06 |
-28:48:20.3 |
HIP 107023 |
25.60 |
| 2026-05-16 12:00 |
21:40:23.42 |
-28:48:39.2 |
HIP 107023 |
25.29 |
| 2026-05-17 00:00 |
21:40:22.75 |
-28:48:58.2 |
HIP 107023 |
24.99 |
| 2026-05-17 12:00 |
21:40:22.04 |
-28:49:17.4 |
HIP 107023 |
24.68 |
| 2026-05-18 00:00 |
21:40:21.29 |
-28:49:36.7 |
HIP 107023 |
24.38 |
| 2026-05-18 12:00 |
21:40:20.51 |
-28:49:56.2 |
HIP 107023 |
24.07 |
| 2026-05-19 00:00 |
21:40:19.69 |
-28:50:15.9 |
HIP 107023 |
23.76 |
| 2026-05-19 12:00 |
21:40:18.84 |
-28:50:35.7 |
HIP 107023 |
23.46 |
| 2026-05-20 00:00 |
21:40:17.95 |
-28:50:55.7 |
HIP 107023 |
23.15 |
| 2026-05-20 12:00 |
21:40:17.02 |
-28:51:15.8 |
HIP 107023 |
22.85 |
| 2026-05-21 00:00 |
21:40:16.06 |
-28:51:36.0 |
HIP 107023 |
22.54 |
| 2026-05-21 12:00 |
21:40:15.06 |
-28:51:56.4 |
HIP 107023 |
22.24 |
| 2026-05-22 00:00 |
21:40:14.03 |
-28:52:17.0 |
HIP 107023 |
21.94 |
| 2026-05-22 12:00 |
21:40:12.96 |
-28:52:37.7 |
HIP 107023 |
21.64 |
| 2026-05-23 00:00 |
21:40:11.85 |
-28:52:58.5 |
HIP 107023 |
21.35 |
| 2026-05-23 12:00 |
21:40:10.71 |
-28:53:19.5 |
HIP 107023 |
21.06 |
| 2026-05-24 00:00 |
21:40:09.53 |
-28:53:40.6 |
HIP 107023 |
20.78 |
| 2026-05-24 12:00 |
21:40:08.32 |
-28:54:01.9 |
HIP 107023 |
20.50 |
| 2026-05-25 00:00 |
21:40:07.07 |
-28:54:23.3 |
HIP 107023 |
20.22 |
| 2026-05-25 12:00 |
21:40:05.78 |
-28:54:44.8 |
HIP 107023 |
19.95 |
| 2026-05-26 00:00 |
21:40:04.46 |
-28:55:06.5 |
HIP 107023 |
19.69 |
| 2026-05-26 12:00 |
21:40:03.11 |
-28:55:28.3 |
HIP 107023 |
19.44 |
| 2026-05-27 00:00 |
21:40:01.71 |
-28:55:50.2 |
HIP 107023 |
19.20 |
| 2026-05-27 12:00 |
21:40:00.29 |
-28:56:12.3 |
HIP 107023 |
18.96 |
| 2026-05-28 00:00 |
21:39:58.82 |
-28:56:34.4 |
HIP 107023 |
18.74 |
| 2026-05-28 12:00 |
21:39:57.33 |
-28:56:56.8 |
HIP 107023 |
18.52 |
| 2026-05-29 00:00 |
21:39:55.79 |
-28:57:19.2 |
HIP 107023 |
18.32 |
| 2026-05-29 12:00 |
21:39:54.23 |
-28:57:41.8 |
HIP 107023 |
18.13 |
| 2026-05-30 00:00 |
21:39:52.62 |
-28:58:04.5 |
HIP 107023 |
17.96 |
| 2026-05-30 12:00 |
21:39:50.99 |
-28:58:27.3 |
HIP 107023 |
17.80 |
| 2026-05-31 00:00 |
21:39:49.31 |
-28:58:50.2 |
HIP 107023 |
17.66 |
| 2026-05-31 12:00 |
21:39:47.61 |
-28:59:13.3 |
HIP 107023 |
17.54 |
| 2026-06-01 00:00 |
21:39:45.86 |
-28:59:36.5 |
HIP 107023 |
17.43 |
| 2026-06-01 12:00 |
21:39:44.09 |
-28:59:59.8 |
HIP 107023 |
17.34 |
| 2026-06-02 00:00 |
21:39:42.27 |
-29:00:23.2 |
HIP 107023 |
17.27 |