メタデータ
| 項目 |
値 |
| Designation |
16P/Brooks 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-06-14T18:26:56.207040Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T10:04:25Z |
| Obs used |
256 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
13.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-06-12.0000000 |
| e |
0.56897473 |
| q (au) |
1.454508 |
| a (au) |
3.374531 |
| i (deg) |
4.306900 |
| Ω (om, deg) |
159.343017 |
| ω (w, deg) |
220.166046 |
| M (ma, deg) |
115.785261 |
等級
散乱 + 全体線形
$$
M_a = (12.758 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.758 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.543 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
15:26:16.60 |
-15:28:49.4 |
HIP 75514 |
9.70 |
| 2026-07-29 12:00 |
15:26:17.45 |
-15:29:16.7 |
HIP 75514 |
10.01 |
| 2026-07-30 00:00 |
15:26:18.53 |
-15:29:44.8 |
HIP 75514 |
10.38 |
| 2026-07-30 12:00 |
15:26:19.83 |
-15:30:13.8 |
HIP 75514 |
10.83 |
| 2026-07-31 00:00 |
15:26:21.37 |
-15:30:43.6 |
HIP 75514 |
11.35 |
| 2026-07-31 12:00 |
15:26:23.14 |
-15:31:14.2 |
HIP 75514 |
11.93 |
| 2026-08-01 00:00 |
15:26:25.13 |
-15:31:45.7 |
HIP 75514 |
12.58 |
| 2026-08-01 12:00 |
15:26:27.35 |
-15:32:18.0 |
HIP 75514 |
13.29 |
| 2026-08-02 00:00 |
15:26:29.81 |
-15:32:51.1 |
HIP 75514 |
14.05 |
| 2026-08-02 12:00 |
15:26:32.48 |
-15:33:25.0 |
HIP 75514 |
14.88 |
| 2026-08-03 00:00 |
15:26:35.39 |
-15:33:59.7 |
HIP 75622 |
14.82 |
| 2026-08-03 12:00 |
15:26:38.52 |
-15:34:35.3 |
HIP 75622 |
13.94 |
| 2026-08-04 00:00 |
15:26:41.88 |
-15:35:11.6 |
HIP 75622 |
13.03 |
| 2026-08-04 12:00 |
15:26:45.46 |
-15:35:48.7 |
HIP 75622 |
12.10 |
| 2026-08-05 00:00 |
15:26:49.27 |
-15:36:26.7 |
HIP 75622 |
11.16 |
| 2026-08-05 12:00 |
15:26:53.30 |
-15:37:05.4 |
HIP 75622 |
10.23 |
| 2026-08-06 00:00 |
15:26:57.56 |
-15:37:45.0 |
HIP 75622 |
9.32 |
| 2026-08-06 12:00 |
15:27:02.04 |
-15:38:25.3 |
HIP 75622 |
8.48 |
| 2026-08-07 00:00 |
15:27:06.75 |
-15:39:06.4 |
HIP 75622 |
7.74 |
| 2026-08-07 12:00 |
15:27:11.68 |
-15:39:48.2 |
HIP 75622 |
7.17 |
| 2026-08-08 00:00 |
15:27:16.83 |
-15:40:30.9 |
HIP 75622 |
6.84 |
| 2026-08-08 12:00 |
15:27:22.21 |
-15:41:14.3 |
HIP 75622 |
6.82 |
| 2026-08-09 00:00 |
15:27:27.81 |
-15:41:58.5 |
HIP 75622 |
7.15 |
| 2026-08-09 12:00 |
15:27:33.63 |
-15:42:43.4 |
HIP 75622 |
7.81 |
| 2026-08-10 00:00 |
15:27:39.67 |
-15:43:29.1 |
HIP 75622 |
8.76 |
| 2026-08-10 12:00 |
15:27:45.93 |
-15:44:15.6 |
HIP 75622 |
9.94 |
| 2026-08-11 00:00 |
15:27:52.42 |
-15:45:02.8 |
HIP 75622 |
11.30 |
| 2026-08-11 12:00 |
15:27:59.12 |
-15:45:50.7 |
HIP 75762 |
10.19 |
| 2026-08-12 00:00 |
15:28:06.04 |
-15:46:39.4 |
HIP 75762 |
9.05 |
| 2026-08-12 12:00 |
15:28:13.18 |
-15:47:28.7 |
HIP 75762 |
8.14 |
| 2026-08-13 00:00 |
15:28:20.54 |
-15:48:18.9 |
HIP 75762 |
7.60 |
| 2026-08-13 12:00 |
15:28:28.12 |
-15:49:09.7 |
HIP 75762 |
7.54 |
| 2026-08-14 00:00 |
15:28:35.91 |
-15:50:01.2 |
HIP 75762 |
8.00 |
| 2026-08-14 12:00 |
15:28:43.92 |
-15:50:53.5 |
HIP 75762 |
8.95 |
| 2026-08-15 00:00 |
15:28:52.14 |
-15:51:46.4 |
HIP 75762 |
10.28 |
| 2026-08-15 12:00 |
15:29:00.58 |
-15:52:40.1 |
HIP 75762 |
11.89 |
| 2026-08-16 00:00 |
15:29:09.23 |
-15:53:34.4 |
HIP 75762 |
13.71 |
| 2026-08-16 12:00 |
15:29:18.09 |
-15:54:29.4 |
HIP 75762 |
15.69 |
| 2026-08-17 00:00 |
15:29:27.17 |
-15:55:25.1 |
HIP 75762 |
17.79 |
| 2026-08-17 12:00 |
15:29:36.45 |
-15:56:21.4 |
HIP 75905 |
17.47 |
| 2026-08-18 00:00 |
15:29:45.95 |
-15:57:18.4 |
HIP 75905 |
17.29 |
| 2026-08-18 12:00 |
15:29:55.66 |
-15:58:16.1 |
HIP 75905 |
17.45 |
| 2026-08-19 00:00 |
15:30:05.57 |
-15:59:14.4 |
HIP 75905 |
17.98 |