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) |
| 2026-05-12 00:00 |
06:39:07.76 |
+21:30:01.4 |
HIP 31663 |
24.48 |
| 2026-05-12 12:00 |
06:39:09.19 |
+21:30:00.5 |
HIP 31663 |
24.78 |
| 2026-05-13 00:00 |
06:39:10.65 |
+21:29:59.6 |
HIP 31663 |
25.08 |
| 2026-05-13 12:00 |
06:39:12.11 |
+21:29:58.6 |
HIP 31663 |
25.38 |
| 2026-05-14 00:00 |
06:39:13.59 |
+21:29:57.7 |
HIP 31663 |
25.68 |
| 2026-05-14 12:00 |
06:39:15.08 |
+21:29:56.7 |
HIP 31663 |
25.99 |
| 2026-05-15 00:00 |
06:39:16.58 |
+21:29:55.7 |
HIP 31663 |
26.31 |
| 2026-05-15 12:00 |
06:39:18.10 |
+21:29:54.7 |
HIP 31663 |
26.63 |
| 2026-05-16 00:00 |
06:39:19.63 |
+21:29:53.7 |
HIP 31663 |
26.95 |
| 2026-05-16 12:00 |
06:39:21.17 |
+21:29:52.6 |
HIP 31663 |
27.27 |
| 2026-05-17 00:00 |
06:39:22.72 |
+21:29:51.5 |
HIP 31663 |
27.60 |
| 2026-05-17 12:00 |
06:39:24.29 |
+21:29:50.5 |
HIP 31663 |
27.93 |
| 2026-05-18 00:00 |
06:39:25.86 |
+21:29:49.4 |
HIP 31663 |
28.26 |
| 2026-05-18 12:00 |
06:39:27.45 |
+21:29:48.2 |
HIP 31663 |
28.60 |
| 2026-05-19 00:00 |
06:39:29.05 |
+21:29:47.1 |
HIP 31663 |
28.94 |
| 2026-05-19 12:00 |
06:39:30.66 |
+21:29:45.9 |
HIP 31663 |
29.29 |
| 2026-05-20 00:00 |
06:39:32.28 |
+21:29:44.8 |
HIP 31663 |
29.64 |
| 2026-05-20 12:00 |
06:39:33.92 |
+21:29:43.6 |
HIP 31663 |
29.99 |
| 2026-05-21 00:00 |
06:39:35.56 |
+21:29:42.4 |
HIP 31663 |
30.34 |
| 2026-05-21 12:00 |
06:39:37.22 |
+21:29:41.2 |
HIP 31848 |
30.52 |
| 2026-05-22 00:00 |
06:39:38.88 |
+21:29:39.9 |
HIP 31848 |
30.56 |
| 2026-05-22 12:00 |
06:39:40.56 |
+21:29:38.7 |
HIP 31848 |
30.61 |
| 2026-05-23 00:00 |
06:39:42.25 |
+21:29:37.4 |
HIP 31848 |
30.66 |
| 2026-05-23 12:00 |
06:39:43.95 |
+21:29:36.1 |
HIP 31848 |
30.72 |
| 2026-05-24 00:00 |
06:39:45.65 |
+21:29:34.8 |
HIP 31848 |
30.79 |
| 2026-05-24 12:00 |
06:39:47.37 |
+21:29:33.4 |
HIP 31848 |
30.86 |
| 2026-05-25 00:00 |
06:39:49.10 |
+21:29:32.1 |
HIP 31848 |
30.93 |
| 2026-05-25 12:00 |
06:39:50.84 |
+21:29:30.7 |
HIP 31848 |
31.01 |
| 2026-05-26 00:00 |
06:39:52.59 |
+21:29:29.4 |
HIP 31848 |
31.10 |
| 2026-05-26 12:00 |
06:39:54.35 |
+21:29:28.0 |
HIP 31848 |
31.19 |
| 2026-05-27 00:00 |
06:39:56.12 |
+21:29:26.6 |
HIP 31848 |
31.29 |
| 2026-05-27 12:00 |
06:39:57.89 |
+21:29:25.1 |
HIP 31848 |
31.40 |
| 2026-05-28 00:00 |
06:39:59.68 |
+21:29:23.7 |
HIP 31848 |
31.51 |
| 2026-05-28 12:00 |
06:40:01.47 |
+21:29:22.3 |
HIP 31848 |
31.62 |
| 2026-05-29 00:00 |
06:40:03.28 |
+21:29:20.8 |
HIP 31848 |
31.74 |
| 2026-05-29 12:00 |
06:40:05.09 |
+21:29:19.3 |
HIP 31848 |
31.87 |
| 2026-05-30 00:00 |
06:40:06.92 |
+21:29:17.8 |
HIP 31848 |
32.00 |
| 2026-05-30 12:00 |
06:40:08.75 |
+21:29:16.3 |
HIP 31848 |
32.14 |
| 2026-05-31 00:00 |
06:40:10.59 |
+21:29:14.7 |
HIP 31848 |
32.29 |
| 2026-05-31 12:00 |
06:40:12.44 |
+21:29:13.2 |
HIP 31848 |
32.44 |
| 2026-06-01 00:00 |
06:40:14.29 |
+21:29:11.6 |
HIP 31848 |
32.60 |
| 2026-06-01 12:00 |
06:40:16.16 |
+21:29:10.0 |
HIP 31848 |
32.76 |
| 2026-06-02 00:00 |
06:40:18.03 |
+21:29:08.4 |
HIP 31848 |
32.93 |