メタデータ
| 項目 |
値 |
| Designation |
C/2009 P2 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-02-10T12:15:33.076800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:33Z |
| Obs used |
507 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-12-14.0000000 |
| e |
1.00153878 |
| q (au) |
6.543973 |
| a (au) |
-4252.703414 |
| i (deg) |
163.452939 |
| Ω (om, deg) |
60.364967 |
| ω (w, deg) |
76.032402 |
| M (ma, deg) |
-0.000208 |
等級
散乱 + 全体線形
$$
M_a = (5.288 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.288 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.687 |
| k |
0.800 |
| δ90 |
9.998 |
| 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 |
14:15:10.52 |
-19:52:08.9 |
HIP 69528 |
26.27 |
| 2026-09-20 12:00 |
14:15:12.98 |
-19:52:19.0 |
HIP 69528 |
26.51 |
| 2026-09-21 00:00 |
14:15:15.45 |
-19:52:29.2 |
HIP 69528 |
26.76 |
| 2026-09-21 12:00 |
14:15:17.95 |
-19:52:39.6 |
HIP 69528 |
27.03 |
| 2026-09-22 00:00 |
14:15:20.46 |
-19:52:50.1 |
HIP 69528 |
27.30 |
| 2026-09-22 12:00 |
14:15:22.99 |
-19:53:00.7 |
HIP 69528 |
27.60 |
| 2026-09-23 00:00 |
14:15:25.54 |
-19:53:11.4 |
HIP 69528 |
27.90 |
| 2026-09-23 12:00 |
14:15:28.11 |
-19:53:22.3 |
HIP 69528 |
28.21 |
| 2026-09-24 00:00 |
14:15:30.69 |
-19:53:33.3 |
HIP 69828 |
27.84 |
| 2026-09-24 12:00 |
14:15:33.29 |
-19:53:44.4 |
HIP 69828 |
27.20 |
| 2026-09-25 00:00 |
14:15:35.91 |
-19:53:55.7 |
HIP 69828 |
26.57 |
| 2026-09-25 12:00 |
14:15:38.54 |
-19:54:07.0 |
HIP 69828 |
25.93 |
| 2026-09-26 00:00 |
14:15:41.19 |
-19:54:18.5 |
HIP 69828 |
25.28 |
| 2026-09-26 12:00 |
14:15:43.86 |
-19:54:30.1 |
HIP 69828 |
24.63 |
| 2026-09-27 00:00 |
14:15:46.54 |
-19:54:41.9 |
HIP 69828 |
23.98 |
| 2026-09-27 12:00 |
14:15:49.24 |
-19:54:53.7 |
HIP 69828 |
23.33 |
| 2026-09-28 00:00 |
14:15:51.95 |
-19:55:05.7 |
HIP 69828 |
22.67 |
| 2026-09-28 12:00 |
14:15:54.68 |
-19:55:17.8 |
HIP 69828 |
22.01 |
| 2026-09-29 00:00 |
14:15:57.43 |
-19:55:30.0 |
HIP 69828 |
21.35 |
| 2026-09-29 12:00 |
14:16:00.19 |
-19:55:42.3 |
HIP 69828 |
20.68 |
| 2026-09-30 00:00 |
14:16:02.97 |
-19:55:54.7 |
HIP 69828 |
20.01 |
| 2026-09-30 12:00 |
14:16:05.76 |
-19:56:07.3 |
HIP 69828 |
19.34 |
| 2026-10-01 00:00 |
14:16:08.56 |
-19:56:19.9 |
HIP 69828 |
18.66 |
| 2026-10-01 12:00 |
14:16:11.38 |
-19:56:32.7 |
HIP 69828 |
17.98 |
| 2026-10-02 00:00 |
14:16:14.22 |
-19:56:45.6 |
HIP 69828 |
17.31 |
| 2026-10-02 12:00 |
14:16:17.06 |
-19:56:58.6 |
HIP 69828 |
16.63 |
| 2026-10-03 00:00 |
14:16:19.93 |
-19:57:11.7 |
HIP 69828 |
15.94 |
| 2026-10-03 12:00 |
14:16:22.80 |
-19:57:24.9 |
HIP 69828 |
15.26 |
| 2026-10-04 00:00 |
14:16:25.69 |
-19:57:38.2 |
HIP 69828 |
14.58 |
| 2026-10-04 12:00 |
14:16:28.59 |
-19:57:51.7 |
HIP 69828 |
13.89 |
| 2026-10-05 00:00 |
14:16:31.51 |
-19:58:05.2 |
HIP 69828 |
13.21 |
| 2026-10-05 12:00 |
14:16:34.43 |
-19:58:18.8 |
HIP 69828 |
12.53 |
| 2026-10-06 00:00 |
14:16:37.37 |
-19:58:32.6 |
HIP 69828 |
11.85 |
| 2026-10-06 12:00 |
14:16:40.32 |
-19:58:46.4 |
HIP 69828 |
11.18 |
| 2026-10-07 00:00 |
14:16:43.29 |
-19:59:00.4 |
HIP 69828 |
10.51 |
| 2026-10-07 12:00 |
14:16:46.26 |
-19:59:14.5 |
HIP 69828 |
9.84 |
| 2026-10-08 00:00 |
14:16:49.25 |
-19:59:28.6 |
HIP 69828 |
9.19 |
| 2026-10-08 12:00 |
14:16:52.25 |
-19:59:42.9 |
HIP 69828 |
8.55 |
| 2026-10-09 00:00 |
14:16:55.26 |
-19:59:57.2 |
HIP 69828 |
7.92 |
| 2026-10-09 12:00 |
14:16:58.28 |
-20:00:11.7 |
HIP 69828 |
7.31 |
| 2026-10-10 00:00 |
14:17:01.31 |
-20:00:26.2 |
HIP 69828 |
6.73 |
| 2026-10-10 12:00 |
14:17:04.35 |
-20:00:40.9 |
HIP 69828 |
6.19 |
| 2026-10-11 00:00 |
14:17:07.40 |
-20:00:55.6 |
HIP 69828 |
5.69 |