メタデータ
| 項目 |
値 |
| Designation |
C/2012 C2 (Bruenjes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-03-12T15:24:12.444480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:02Z |
| Obs used |
245 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
37.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-02-17.0000000 |
| e |
1.00307783 |
| q (au) |
0.802314 |
| a (au) |
-260.675176 |
| i (deg) |
162.789231 |
| Ω (om, deg) |
117.996689 |
| ω (w, deg) |
62.658603 |
| M (ma, deg) |
-0.005771 |
等級
散乱 + 全体線形
$$
M_a = (16.388 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.388 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
16:58:10.47 |
-34:43:14.3 |
HIP 83067 |
8.35 |
| 2026-03-26 12:00 |
16:58:08.83 |
-34:43:23.7 |
HIP 83067 |
8.61 |
| 2026-03-27 00:00 |
16:58:07.16 |
-34:43:32.9 |
HIP 83067 |
8.89 |
| 2026-03-27 12:00 |
16:58:05.45 |
-34:43:42.1 |
HIP 83067 |
9.17 |
| 2026-03-28 00:00 |
16:58:03.70 |
-34:43:51.2 |
HIP 83067 |
9.46 |
| 2026-03-28 12:00 |
16:58:01.92 |
-34:44:00.2 |
HIP 83067 |
9.76 |
| 2026-03-29 00:00 |
16:58:00.10 |
-34:44:09.2 |
HIP 83067 |
10.07 |
| 2026-03-29 12:00 |
16:57:58.25 |
-34:44:18.0 |
HIP 83067 |
10.39 |
| 2026-03-30 00:00 |
16:57:56.36 |
-34:44:26.8 |
HIP 83067 |
10.72 |
| 2026-03-30 12:00 |
16:57:54.43 |
-34:44:35.5 |
HIP 83067 |
11.06 |
| 2026-03-31 00:00 |
16:57:52.47 |
-34:44:44.1 |
HIP 83067 |
11.40 |
| 2026-03-31 12:00 |
16:57:50.47 |
-34:44:52.6 |
HIP 83067 |
11.76 |
| 2026-04-01 00:00 |
16:57:48.43 |
-34:45:01.1 |
HIP 83067 |
12.12 |
| 2026-04-01 12:00 |
16:57:46.36 |
-34:45:09.4 |
HIP 83067 |
12.49 |
| 2026-04-02 00:00 |
16:57:44.26 |
-34:45:17.7 |
HIP 83067 |
12.87 |
| 2026-04-02 12:00 |
16:57:42.11 |
-34:45:25.8 |
HIP 83067 |
13.26 |
| 2026-04-03 00:00 |
16:57:39.94 |
-34:45:33.9 |
HIP 83067 |
13.66 |
| 2026-04-03 12:00 |
16:57:37.73 |
-34:45:41.9 |
HIP 83067 |
14.06 |
| 2026-04-04 00:00 |
16:57:35.48 |
-34:45:49.8 |
HIP 83067 |
14.47 |
| 2026-04-04 12:00 |
16:57:33.20 |
-34:45:57.6 |
HIP 83067 |
14.89 |
| 2026-04-05 00:00 |
16:57:30.88 |
-34:46:05.4 |
HIP 83067 |
15.32 |
| 2026-04-05 12:00 |
16:57:28.53 |
-34:46:13.0 |
HIP 83067 |
15.76 |
| 2026-04-06 00:00 |
16:57:26.15 |
-34:46:20.5 |
HIP 83067 |
16.20 |
| 2026-04-06 12:00 |
16:57:23.73 |
-34:46:28.0 |
HIP 83067 |
16.65 |
| 2026-04-07 00:00 |
16:57:21.28 |
-34:46:35.3 |
HIP 83067 |
17.11 |
| 2026-04-07 12:00 |
16:57:18.79 |
-34:46:42.5 |
HIP 83067 |
17.58 |
| 2026-04-08 00:00 |
16:57:16.27 |
-34:46:49.7 |
HIP 83067 |
18.06 |
| 2026-04-08 12:00 |
16:57:13.72 |
-34:46:56.8 |
HIP 83067 |
18.54 |
| 2026-04-09 00:00 |
16:57:11.13 |
-34:47:03.7 |
HIP 83067 |
19.03 |
| 2026-04-09 12:00 |
16:57:08.51 |
-34:47:10.6 |
HIP 83067 |
19.52 |
| 2026-04-10 00:00 |
16:57:05.85 |
-34:47:17.3 |
HIP 83067 |
20.03 |
| 2026-04-10 12:00 |
16:57:03.17 |
-34:47:24.0 |
HIP 83067 |
20.54 |
| 2026-04-11 00:00 |
16:57:00.45 |
-34:47:30.6 |
HIP 83067 |
21.06 |
| 2026-04-11 12:00 |
16:56:57.70 |
-34:47:37.0 |
HIP 83067 |
21.58 |
| 2026-04-12 00:00 |
16:56:54.91 |
-34:47:43.4 |
HIP 83067 |
22.12 |
| 2026-04-12 12:00 |
16:56:52.10 |
-34:47:49.6 |
HIP 83067 |
22.66 |
| 2026-04-13 00:00 |
16:56:49.25 |
-34:47:55.8 |
HIP 83067 |
23.20 |
| 2026-04-13 12:00 |
16:56:46.37 |
-34:48:01.8 |
HIP 83067 |
23.76 |
| 2026-04-14 00:00 |
16:56:43.46 |
-34:48:07.8 |
HIP 83067 |
24.32 |
| 2026-04-14 12:00 |
16:56:40.51 |
-34:48:13.6 |
HIP 83067 |
24.88 |
| 2026-04-15 00:00 |
16:56:37.54 |
-34:48:19.4 |
HIP 83067 |
25.46 |
| 2026-04-15 12:00 |
16:56:34.53 |
-34:48:25.0 |
HIP 83067 |
26.04 |
| 2026-04-16 00:00 |
16:56:31.50 |
-34:48:30.5 |
HIP 83067 |
26.62 |