メタデータ
| 項目 |
値 |
| Designation |
P/2011 Y2 (Boattini) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-03-21T16:42:15.212160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:59Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
16.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-12-28.0000000 |
| e |
0.71292045 |
| q (au) |
1.787148 |
| a (au) |
6.225270 |
| i (deg) |
6.351399 |
| Ω (om, deg) |
310.018388 |
| ω (w, deg) |
131.187614 |
| M (ma, deg) |
354.625603 |
等級
散乱 + 全体線形
$$
M_a = (13.174 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.174 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
5.312 |
| 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) |
| 2026-07-29 00:00 |
22:22:08.73 |
-07:21:52.0 |
HIP 110396 |
16.08 |
| 2026-07-29 12:00 |
22:21:54.06 |
-07:22:39.3 |
HIP 110396 |
14.17 |
| 2026-07-30 00:00 |
22:21:39.21 |
-07:23:27.7 |
HIP 110396 |
13.05 |
| 2026-07-30 12:00 |
22:21:24.18 |
-07:24:17.2 |
HIP 110396 |
12.97 |
| 2026-07-31 00:00 |
22:21:08.96 |
-07:25:07.7 |
HIP 110396 |
13.98 |
| 2026-07-31 12:00 |
22:20:53.57 |
-07:25:59.3 |
HIP 110396 |
15.92 |
| 2026-08-01 00:00 |
22:20:37.99 |
-07:26:51.9 |
HIP 110396 |
18.52 |
| 2026-08-01 12:00 |
22:20:22.24 |
-07:27:45.6 |
HIP 110187 |
20.56 |
| 2026-08-02 00:00 |
22:20:06.31 |
-07:28:40.3 |
HIP 110187 |
17.58 |
| 2026-08-02 12:00 |
22:19:50.21 |
-07:29:36.0 |
HIP 110187 |
15.10 |
| 2026-08-03 00:00 |
22:19:33.93 |
-07:30:32.7 |
HIP 110187 |
13.44 |
| 2026-08-03 12:00 |
22:19:17.49 |
-07:31:30.4 |
HIP 110187 |
12.94 |
| 2026-08-04 00:00 |
22:19:00.87 |
-07:32:29.1 |
HIP 110187 |
13.79 |
| 2026-08-04 12:00 |
22:18:44.09 |
-07:33:28.8 |
HIP 110079 |
13.35 |
| 2026-08-05 00:00 |
22:18:27.15 |
-07:34:29.5 |
HIP 110079 |
9.07 |
| 2026-08-05 12:00 |
22:18:10.04 |
-07:35:31.1 |
HIP 110079 |
4.80 |
| 2026-08-06 00:00 |
22:17:52.78 |
-07:36:33.7 |
HIP 110079 |
1.40 |
| 2026-08-06 12:00 |
22:17:35.35 |
-07:37:37.2 |
HIP 110079 |
4.47 |
| 2026-08-07 00:00 |
22:17:17.78 |
-07:38:41.6 |
HIP 110079 |
8.85 |
| 2026-08-07 12:00 |
22:17:00.04 |
-07:39:47.0 |
HIP 110003 |
7.63 |
| 2026-08-08 00:00 |
22:16:42.16 |
-07:40:53.3 |
HIP 110003 |
6.40 |
| 2026-08-08 12:00 |
22:16:24.14 |
-07:42:00.5 |
HIP 110003 |
8.11 |
| 2026-08-09 00:00 |
22:16:05.96 |
-07:43:08.5 |
HIP 110003 |
11.56 |
| 2026-08-09 12:00 |
22:15:47.65 |
-07:44:17.4 |
HIP 110003 |
15.67 |
| 2026-08-10 00:00 |
22:15:29.19 |
-07:45:27.2 |
HIP 109869 |
18.44 |
| 2026-08-10 12:00 |
22:15:10.60 |
-07:46:37.8 |
HIP 109869 |
16.60 |
| 2026-08-11 00:00 |
22:14:51.87 |
-07:47:49.3 |
HIP 109869 |
16.01 |
| 2026-08-11 12:00 |
22:14:33.02 |
-07:49:01.5 |
HIP 109869 |
16.82 |
| 2026-08-12 00:00 |
22:14:14.04 |
-07:50:14.5 |
HIP 109869 |
18.89 |
| 2026-08-12 12:00 |
22:13:54.93 |
-07:51:28.3 |
HIP 109637 |
21.72 |
| 2026-08-13 00:00 |
22:13:35.70 |
-07:52:42.9 |
HIP 109637 |
16.92 |
| 2026-08-13 12:00 |
22:13:16.35 |
-07:53:58.2 |
HIP 109637 |
12.17 |
| 2026-08-14 00:00 |
22:12:56.90 |
-07:55:14.2 |
HIP 109637 |
7.66 |
| 2026-08-14 12:00 |
22:12:37.32 |
-07:56:31.0 |
HIP 109637 |
4.33 |
| 2026-08-15 00:00 |
22:12:17.65 |
-07:57:48.4 |
HIP 109637 |
5.41 |
| 2026-08-15 12:00 |
22:11:57.86 |
-07:59:06.5 |
HIP 109637 |
9.54 |
| 2026-08-16 00:00 |
22:11:37.98 |
-08:00:25.2 |
HIP 109637 |
14.31 |
| 2026-08-16 12:00 |
22:11:18.00 |
-08:01:44.6 |
HIP 109637 |
19.27 |
| 2026-08-17 00:00 |
22:10:57.93 |
-08:03:04.6 |
HIP 109369 |
23.95 |
| 2026-08-17 12:00 |
22:10:37.77 |
-08:04:25.2 |
HIP 109369 |
18.80 |
| 2026-08-18 00:00 |
22:10:17.52 |
-08:05:46.4 |
HIP 109369 |
13.64 |
| 2026-08-18 12:00 |
22:09:57.18 |
-08:07:08.2 |
HIP 109369 |
8.51 |
| 2026-08-19 00:00 |
22:09:36.77 |
-08:08:30.5 |
HIP 109369 |
3.61 |