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) |
| 2026-05-12 00:00 |
02:46:45.84 |
+37:02:33.9 |
HIP 13009 |
29.20 |
| 2026-05-12 12:00 |
02:46:48.15 |
+37:02:43.0 |
HIP 13009 |
29.27 |
| 2026-05-13 00:00 |
02:46:50.45 |
+37:02:52.2 |
HIP 13009 |
29.36 |
| 2026-05-13 12:00 |
02:46:52.75 |
+37:03:01.4 |
HIP 13009 |
29.45 |
| 2026-05-14 00:00 |
02:46:55.05 |
+37:03:10.8 |
HIP 13009 |
29.55 |
| 2026-05-14 12:00 |
02:46:57.35 |
+37:03:20.2 |
HIP 13009 |
29.66 |
| 2026-05-15 00:00 |
02:46:59.64 |
+37:03:29.7 |
HIP 13009 |
29.78 |
| 2026-05-15 12:00 |
02:47:01.93 |
+37:03:39.3 |
HIP 13009 |
29.90 |
| 2026-05-16 00:00 |
02:47:04.21 |
+37:03:48.9 |
HIP 13009 |
30.04 |
| 2026-05-16 12:00 |
02:47:06.50 |
+37:03:58.7 |
HIP 13009 |
30.18 |
| 2026-05-17 00:00 |
02:47:08.77 |
+37:04:08.5 |
HIP 13009 |
30.33 |
| 2026-05-17 12:00 |
02:47:11.05 |
+37:04:18.3 |
HIP 13009 |
30.49 |
| 2026-05-18 00:00 |
02:47:13.32 |
+37:04:28.3 |
HIP 13176 |
30.60 |
| 2026-05-18 12:00 |
02:47:15.59 |
+37:04:38.3 |
HIP 13176 |
30.12 |
| 2026-05-19 00:00 |
02:47:17.85 |
+37:04:48.4 |
HIP 13176 |
29.65 |
| 2026-05-19 12:00 |
02:47:20.10 |
+37:04:58.5 |
HIP 13176 |
29.17 |
| 2026-05-20 00:00 |
02:47:22.36 |
+37:05:08.7 |
HIP 13176 |
28.70 |
| 2026-05-20 12:00 |
02:47:24.60 |
+37:05:19.0 |
HIP 13176 |
28.23 |
| 2026-05-21 00:00 |
02:47:26.85 |
+37:05:29.3 |
HIP 13176 |
27.76 |
| 2026-05-21 12:00 |
02:47:29.08 |
+37:05:39.7 |
HIP 13176 |
27.28 |
| 2026-05-22 00:00 |
02:47:31.31 |
+37:05:50.2 |
HIP 13176 |
26.81 |
| 2026-05-22 12:00 |
02:47:33.54 |
+37:06:00.8 |
HIP 13176 |
26.34 |
| 2026-05-23 00:00 |
02:47:35.76 |
+37:06:11.4 |
HIP 13176 |
25.87 |
| 2026-05-23 12:00 |
02:47:37.97 |
+37:06:22.0 |
HIP 13176 |
25.40 |
| 2026-05-24 00:00 |
02:47:40.18 |
+37:06:32.7 |
HIP 13176 |
24.93 |
| 2026-05-24 12:00 |
02:47:42.38 |
+37:06:43.5 |
HIP 13176 |
24.46 |
| 2026-05-25 00:00 |
02:47:44.58 |
+37:06:54.4 |
HIP 13176 |
24.00 |
| 2026-05-25 12:00 |
02:47:46.77 |
+37:07:05.3 |
HIP 13176 |
23.53 |
| 2026-05-26 00:00 |
02:47:48.95 |
+37:07:16.2 |
HIP 13176 |
23.07 |
| 2026-05-26 12:00 |
02:47:51.13 |
+37:07:27.3 |
HIP 13176 |
22.60 |
| 2026-05-27 00:00 |
02:47:53.30 |
+37:07:38.3 |
HIP 13176 |
22.14 |
| 2026-05-27 12:00 |
02:47:55.46 |
+37:07:49.5 |
HIP 13176 |
21.68 |
| 2026-05-28 00:00 |
02:47:57.61 |
+37:08:00.7 |
HIP 13176 |
21.21 |
| 2026-05-28 12:00 |
02:47:59.76 |
+37:08:11.9 |
HIP 13176 |
20.75 |
| 2026-05-29 00:00 |
02:48:01.90 |
+37:08:23.2 |
HIP 13176 |
20.29 |
| 2026-05-29 12:00 |
02:48:04.03 |
+37:08:34.6 |
HIP 13176 |
19.83 |
| 2026-05-30 00:00 |
02:48:06.16 |
+37:08:46.0 |
HIP 13176 |
19.38 |
| 2026-05-30 12:00 |
02:48:08.28 |
+37:08:57.4 |
HIP 13176 |
18.92 |
| 2026-05-31 00:00 |
02:48:10.39 |
+37:09:08.9 |
HIP 13176 |
18.47 |
| 2026-05-31 12:00 |
02:48:12.49 |
+37:09:20.5 |
HIP 13176 |
18.01 |
| 2026-06-01 00:00 |
02:48:14.58 |
+37:09:32.1 |
HIP 13176 |
17.56 |
| 2026-06-01 12:00 |
02:48:16.66 |
+37:09:43.7 |
HIP 13176 |
17.11 |
| 2026-06-02 00:00 |
02:48:18.74 |
+37:09:55.4 |
HIP 13176 |
16.66 |