メタデータ
| 項目 |
値 |
| Designation |
C/1992 B1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-03-19T12:58:11.899200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
19 |
| 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) |
1992-02-10.0000000 |
| e |
0.99992571 |
| q (au) |
0.500109 |
| a (au) |
6732.201164 |
| i (deg) |
20.237830 |
| Ω (om, deg) |
275.347033 |
| ω (w, deg) |
15.346028 |
| M (ma, deg) |
359.999931 |
等級
散乱 + 全体線形
$$
M_a = (9.662 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.662 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
06:38:02.51 |
+21:30:04.4 |
HIP 31663 |
13.83 |
| 2026-03-26 12:00 |
06:38:02.39 |
+21:30:05.2 |
HIP 31663 |
13.80 |
| 2026-03-27 00:00 |
06:38:02.28 |
+21:30:06.0 |
HIP 31663 |
13.78 |
| 2026-03-27 12:00 |
06:38:02.19 |
+21:30:06.8 |
HIP 31663 |
13.76 |
| 2026-03-28 00:00 |
06:38:02.12 |
+21:30:07.6 |
HIP 31663 |
13.74 |
| 2026-03-28 12:00 |
06:38:02.07 |
+21:30:08.3 |
HIP 31663 |
13.73 |
| 2026-03-29 00:00 |
06:38:02.03 |
+21:30:09.0 |
HIP 31663 |
13.71 |
| 2026-03-29 12:00 |
06:38:02.02 |
+21:30:09.7 |
HIP 31663 |
13.70 |
| 2026-03-30 00:00 |
06:38:02.02 |
+21:30:10.4 |
HIP 31663 |
13.69 |
| 2026-03-30 12:00 |
06:38:02.05 |
+21:30:11.1 |
HIP 31663 |
13.68 |
| 2026-03-31 00:00 |
06:38:02.09 |
+21:30:11.7 |
HIP 31663 |
13.68 |
| 2026-03-31 12:00 |
06:38:02.15 |
+21:30:12.4 |
HIP 31663 |
13.67 |
| 2026-04-01 00:00 |
06:38:02.23 |
+21:30:13.0 |
HIP 31663 |
13.67 |
| 2026-04-01 12:00 |
06:38:02.33 |
+21:30:13.6 |
HIP 31663 |
13.67 |
| 2026-04-02 00:00 |
06:38:02.44 |
+21:30:14.2 |
HIP 31663 |
13.68 |
| 2026-04-02 12:00 |
06:38:02.58 |
+21:30:14.7 |
HIP 31663 |
13.68 |
| 2026-04-03 00:00 |
06:38:02.73 |
+21:30:15.3 |
HIP 31663 |
13.69 |
| 2026-04-03 12:00 |
06:38:02.90 |
+21:30:15.8 |
HIP 31663 |
13.70 |
| 2026-04-04 00:00 |
06:38:03.09 |
+21:30:16.3 |
HIP 31663 |
13.71 |
| 2026-04-04 12:00 |
06:38:03.30 |
+21:30:16.8 |
HIP 31663 |
13.72 |
| 2026-04-05 00:00 |
06:38:03.52 |
+21:30:17.3 |
HIP 31663 |
13.74 |
| 2026-04-05 12:00 |
06:38:03.77 |
+21:30:17.8 |
HIP 31663 |
13.76 |
| 2026-04-06 00:00 |
06:38:04.03 |
+21:30:18.2 |
HIP 31663 |
13.78 |
| 2026-04-06 12:00 |
06:38:04.31 |
+21:30:18.6 |
HIP 31663 |
13.80 |
| 2026-04-07 00:00 |
06:38:04.61 |
+21:30:19.0 |
HIP 31663 |
13.83 |
| 2026-04-07 12:00 |
06:38:04.93 |
+21:30:19.4 |
HIP 31663 |
13.85 |
| 2026-04-08 00:00 |
06:38:05.27 |
+21:30:19.8 |
HIP 31663 |
13.88 |
| 2026-04-08 12:00 |
06:38:05.62 |
+21:30:20.1 |
HIP 31663 |
13.92 |
| 2026-04-09 00:00 |
06:38:05.99 |
+21:30:20.5 |
HIP 31663 |
13.95 |
| 2026-04-09 12:00 |
06:38:06.38 |
+21:30:20.8 |
HIP 31663 |
13.99 |
| 2026-04-10 00:00 |
06:38:06.79 |
+21:30:21.1 |
HIP 31663 |
14.03 |
| 2026-04-10 12:00 |
06:38:07.22 |
+21:30:21.4 |
HIP 31663 |
14.08 |
| 2026-04-11 00:00 |
06:38:07.66 |
+21:30:21.6 |
HIP 31663 |
14.13 |
| 2026-04-11 12:00 |
06:38:08.13 |
+21:30:21.9 |
HIP 31663 |
14.18 |
| 2026-04-12 00:00 |
06:38:08.61 |
+21:30:22.1 |
HIP 31663 |
14.23 |
| 2026-04-12 12:00 |
06:38:09.11 |
+21:30:22.3 |
HIP 31663 |
14.29 |
| 2026-04-13 00:00 |
06:38:09.62 |
+21:30:22.5 |
HIP 31663 |
14.35 |
| 2026-04-13 12:00 |
06:38:10.16 |
+21:30:22.6 |
HIP 31663 |
14.41 |
| 2026-04-14 00:00 |
06:38:10.71 |
+21:30:22.8 |
HIP 31663 |
14.47 |
| 2026-04-14 12:00 |
06:38:11.28 |
+21:30:22.9 |
HIP 31663 |
14.54 |
| 2026-04-15 00:00 |
06:38:11.86 |
+21:30:23.0 |
HIP 31663 |
14.62 |
| 2026-04-15 12:00 |
06:38:12.47 |
+21:30:23.1 |
HIP 31663 |
14.69 |
| 2026-04-16 00:00 |
06:38:13.09 |
+21:30:23.2 |
HIP 31663 |
14.77 |