メタデータ
| 項目 |
値 |
| Designation |
C/1992 J2 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-05-25T19:03:09.063360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
13 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-05-19.0000000 |
| e |
1.00000000 |
| q (au) |
0.592320 |
| a (au) |
- |
| i (deg) |
158.564625 |
| Ω (om, deg) |
160.008049 |
| ω (w, deg) |
299.721515 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (11.892 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.892 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
02:50:48.13 |
+37:33:54.0 |
HIP 13176 |
21.56 |
| 2026-07-29 12:00 |
02:50:48.46 |
+37:34:05.6 |
HIP 13176 |
21.73 |
| 2026-07-30 00:00 |
02:50:48.76 |
+37:34:17.2 |
HIP 13176 |
21.91 |
| 2026-07-30 12:00 |
02:50:49.04 |
+37:34:28.7 |
HIP 13176 |
22.08 |
| 2026-07-31 00:00 |
02:50:49.31 |
+37:34:40.1 |
HIP 13176 |
22.24 |
| 2026-07-31 12:00 |
02:50:49.55 |
+37:34:51.5 |
HIP 13176 |
22.41 |
| 2026-08-01 00:00 |
02:50:49.78 |
+37:35:02.9 |
HIP 13176 |
22.57 |
| 2026-08-01 12:00 |
02:50:49.98 |
+37:35:14.2 |
HIP 13176 |
22.73 |
| 2026-08-02 00:00 |
02:50:50.17 |
+37:35:25.4 |
HIP 13176 |
22.88 |
| 2026-08-02 12:00 |
02:50:50.33 |
+37:35:36.6 |
HIP 13176 |
23.04 |
| 2026-08-03 00:00 |
02:50:50.47 |
+37:35:47.7 |
HIP 13176 |
23.19 |
| 2026-08-03 12:00 |
02:50:50.60 |
+37:35:58.8 |
HIP 13176 |
23.33 |
| 2026-08-04 00:00 |
02:50:50.70 |
+37:36:09.8 |
HIP 13176 |
23.48 |
| 2026-08-04 12:00 |
02:50:50.78 |
+37:36:20.7 |
HIP 13176 |
23.62 |
| 2026-08-05 00:00 |
02:50:50.85 |
+37:36:31.6 |
HIP 13176 |
23.76 |
| 2026-08-05 12:00 |
02:50:50.89 |
+37:36:42.5 |
HIP 13176 |
23.89 |
| 2026-08-06 00:00 |
02:50:50.91 |
+37:36:53.2 |
HIP 13176 |
24.02 |
| 2026-08-06 12:00 |
02:50:50.92 |
+37:37:03.9 |
HIP 13176 |
24.15 |
| 2026-08-07 00:00 |
02:50:50.90 |
+37:37:14.6 |
HIP 13176 |
24.28 |
| 2026-08-07 12:00 |
02:50:50.86 |
+37:37:25.1 |
HIP 13176 |
24.40 |
| 2026-08-08 00:00 |
02:50:50.80 |
+37:37:35.7 |
HIP 13176 |
24.52 |
| 2026-08-08 12:00 |
02:50:50.72 |
+37:37:46.1 |
HIP 13176 |
24.64 |
| 2026-08-09 00:00 |
02:50:50.63 |
+37:37:56.5 |
HIP 13176 |
24.75 |
| 2026-08-09 12:00 |
02:50:50.51 |
+37:38:06.8 |
HIP 13176 |
24.86 |
| 2026-08-10 00:00 |
02:50:50.37 |
+37:38:17.0 |
HIP 13176 |
24.97 |
| 2026-08-10 12:00 |
02:50:50.20 |
+37:38:27.2 |
HIP 13176 |
25.08 |
| 2026-08-11 00:00 |
02:50:50.02 |
+37:38:37.3 |
HIP 13176 |
25.18 |
| 2026-08-11 12:00 |
02:50:49.82 |
+37:38:47.3 |
HIP 13176 |
25.28 |
| 2026-08-12 00:00 |
02:50:49.60 |
+37:38:57.3 |
HIP 13176 |
25.38 |
| 2026-08-12 12:00 |
02:50:49.36 |
+37:39:07.2 |
HIP 13176 |
25.47 |
| 2026-08-13 00:00 |
02:50:49.09 |
+37:39:17.0 |
HIP 13176 |
25.57 |
| 2026-08-13 12:00 |
02:50:48.81 |
+37:39:26.7 |
HIP 13176 |
25.66 |
| 2026-08-14 00:00 |
02:50:48.51 |
+37:39:36.4 |
HIP 13176 |
25.74 |
| 2026-08-14 12:00 |
02:50:48.18 |
+37:39:45.9 |
HIP 13176 |
25.83 |
| 2026-08-15 00:00 |
02:50:47.83 |
+37:39:55.4 |
HIP 13176 |
25.91 |
| 2026-08-15 12:00 |
02:50:47.47 |
+37:40:04.9 |
HIP 13176 |
25.99 |
| 2026-08-16 00:00 |
02:50:47.08 |
+37:40:14.2 |
HIP 13176 |
26.06 |
| 2026-08-16 12:00 |
02:50:46.68 |
+37:40:23.5 |
HIP 13176 |
26.14 |
| 2026-08-17 00:00 |
02:50:46.25 |
+37:40:32.7 |
HIP 13176 |
26.21 |
| 2026-08-17 12:00 |
02:50:45.80 |
+37:40:41.8 |
HIP 13176 |
26.28 |
| 2026-08-18 00:00 |
02:50:45.33 |
+37:40:50.8 |
HIP 13176 |
26.34 |
| 2026-08-18 12:00 |
02:50:44.84 |
+37:40:59.7 |
HIP 13176 |
26.40 |
| 2026-08-19 00:00 |
02:50:44.34 |
+37:41:08.6 |
HIP 13176 |
26.47 |