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) |
| 2026-07-29 00:00 |
16:42:34.43 |
-34:28:31.6 |
HIP 81772 |
5.40 |
| 2026-07-29 12:00 |
16:42:31.74 |
-34:28:18.4 |
HIP 81772 |
4.82 |
| 2026-07-30 00:00 |
16:42:29.07 |
-34:28:05.1 |
HIP 81772 |
4.25 |
| 2026-07-30 12:00 |
16:42:26.44 |
-34:27:51.9 |
HIP 81772 |
3.69 |
| 2026-07-31 00:00 |
16:42:23.84 |
-34:27:38.6 |
HIP 81772 |
3.16 |
| 2026-07-31 12:00 |
16:42:21.27 |
-34:27:25.4 |
HIP 81772 |
2.64 |
| 2026-08-01 00:00 |
16:42:18.73 |
-34:27:12.1 |
HIP 81772 |
2.16 |
| 2026-08-01 12:00 |
16:42:16.23 |
-34:26:58.8 |
HIP 81772 |
1.75 |
| 2026-08-02 00:00 |
16:42:13.76 |
-34:26:45.6 |
HIP 81772 |
1.43 |
| 2026-08-02 12:00 |
16:42:11.32 |
-34:26:32.3 |
HIP 81772 |
1.30 |
| 2026-08-03 00:00 |
16:42:08.91 |
-34:26:19.1 |
HIP 81772 |
1.39 |
| 2026-08-03 12:00 |
16:42:06.53 |
-34:26:05.8 |
HIP 81772 |
1.66 |
| 2026-08-04 00:00 |
16:42:04.19 |
-34:25:52.6 |
HIP 81772 |
2.04 |
| 2026-08-04 12:00 |
16:42:01.88 |
-34:25:39.3 |
HIP 81772 |
2.47 |
| 2026-08-05 00:00 |
16:41:59.61 |
-34:25:26.1 |
HIP 81772 |
2.93 |
| 2026-08-05 12:00 |
16:41:57.36 |
-34:25:12.9 |
HIP 81772 |
3.39 |
| 2026-08-06 00:00 |
16:41:55.15 |
-34:24:59.7 |
HIP 81772 |
3.87 |
| 2026-08-06 12:00 |
16:41:52.98 |
-34:24:46.5 |
HIP 81772 |
4.35 |
| 2026-08-07 00:00 |
16:41:50.83 |
-34:24:33.3 |
HIP 81772 |
4.82 |
| 2026-08-07 12:00 |
16:41:48.73 |
-34:24:20.1 |
HIP 81772 |
5.30 |
| 2026-08-08 00:00 |
16:41:46.65 |
-34:24:06.9 |
HIP 81772 |
5.77 |
| 2026-08-08 12:00 |
16:41:44.61 |
-34:23:53.8 |
HIP 81772 |
6.23 |
| 2026-08-09 00:00 |
16:41:42.60 |
-34:23:40.6 |
HIP 81772 |
6.70 |
| 2026-08-09 12:00 |
16:41:40.63 |
-34:23:27.5 |
HIP 81772 |
7.15 |
| 2026-08-10 00:00 |
16:41:38.69 |
-34:23:14.4 |
HIP 81772 |
7.61 |
| 2026-08-10 12:00 |
16:41:36.79 |
-34:23:01.3 |
HIP 81772 |
8.05 |
| 2026-08-11 00:00 |
16:41:34.92 |
-34:22:48.3 |
HIP 81772 |
8.49 |
| 2026-08-11 12:00 |
16:41:33.09 |
-34:22:35.2 |
HIP 81772 |
8.93 |
| 2026-08-12 00:00 |
16:41:31.29 |
-34:22:22.2 |
HIP 81772 |
9.35 |
| 2026-08-12 12:00 |
16:41:29.53 |
-34:22:09.2 |
HIP 81772 |
9.78 |
| 2026-08-13 00:00 |
16:41:27.80 |
-34:21:56.3 |
HIP 81772 |
10.19 |
| 2026-08-13 12:00 |
16:41:26.10 |
-34:21:43.3 |
HIP 81772 |
10.60 |
| 2026-08-14 00:00 |
16:41:24.45 |
-34:21:30.4 |
HIP 81772 |
11.01 |
| 2026-08-14 12:00 |
16:41:22.83 |
-34:21:17.5 |
HIP 81772 |
11.40 |
| 2026-08-15 00:00 |
16:41:21.24 |
-34:21:04.7 |
HIP 81772 |
11.80 |
| 2026-08-15 12:00 |
16:41:19.69 |
-34:20:51.8 |
HIP 81772 |
12.18 |
| 2026-08-16 00:00 |
16:41:18.17 |
-34:20:39.0 |
HIP 81772 |
12.56 |
| 2026-08-16 12:00 |
16:41:16.69 |
-34:20:26.3 |
HIP 81772 |
12.93 |
| 2026-08-17 00:00 |
16:41:15.25 |
-34:20:13.5 |
HIP 81772 |
13.30 |
| 2026-08-17 12:00 |
16:41:13.84 |
-34:20:00.8 |
HIP 81772 |
13.66 |
| 2026-08-18 00:00 |
16:41:12.47 |
-34:19:48.2 |
HIP 81772 |
14.01 |
| 2026-08-18 12:00 |
16:41:11.14 |
-34:19:35.5 |
HIP 81772 |
14.36 |
| 2026-08-19 00:00 |
16:41:09.84 |
-34:19:23.0 |
HIP 81772 |
14.70 |