メタデータ
| 項目 |
値 |
| Designation |
C/1972 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1972-03-27T16:49:37.511040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1972-04-24.0000000 |
| e |
0.99814080 |
| q (au) |
0.927218 |
| a (au) |
498.718434 |
| i (deg) |
123.692688 |
| Ω (om, deg) |
160.299080 |
| ω (w, deg) |
257.698891 |
| M (ma, deg) |
0.002416 |
等級
散乱 + 全体線形
$$
M_a = (8.513 + 3.707\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.513 |
| n |
3.707 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
0.978 |
| δ90 |
2.272 |
| 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 |
08:30:32.98 |
+70:02:43.7 |
HIP 42086 |
21.69 |
| 2026-05-12 12:00 |
08:30:34.05 |
+70:02:26.3 |
HIP 42086 |
21.54 |
| 2026-05-13 00:00 |
08:30:35.15 |
+70:02:08.9 |
HIP 42086 |
21.39 |
| 2026-05-13 12:00 |
08:30:36.29 |
+70:01:51.6 |
HIP 42086 |
21.25 |
| 2026-05-14 00:00 |
08:30:37.46 |
+70:01:34.2 |
HIP 42086 |
21.10 |
| 2026-05-14 12:00 |
08:30:38.67 |
+70:01:16.9 |
HIP 42086 |
20.96 |
| 2026-05-15 00:00 |
08:30:39.91 |
+70:00:59.6 |
HIP 42086 |
20.81 |
| 2026-05-15 12:00 |
08:30:41.18 |
+70:00:42.3 |
HIP 42086 |
20.67 |
| 2026-05-16 00:00 |
08:30:42.48 |
+70:00:25.0 |
HIP 42086 |
20.52 |
| 2026-05-16 12:00 |
08:30:43.82 |
+70:00:07.8 |
HIP 42086 |
20.38 |
| 2026-05-17 00:00 |
08:30:45.20 |
+69:59:50.5 |
HIP 42086 |
20.24 |
| 2026-05-17 12:00 |
08:30:46.60 |
+69:59:33.4 |
HIP 42086 |
20.10 |
| 2026-05-18 00:00 |
08:30:48.04 |
+69:59:16.2 |
HIP 42086 |
19.96 |
| 2026-05-18 12:00 |
08:30:49.51 |
+69:58:59.1 |
HIP 42086 |
19.82 |
| 2026-05-19 00:00 |
08:30:51.02 |
+69:58:41.9 |
HIP 42086 |
19.69 |
| 2026-05-19 12:00 |
08:30:52.55 |
+69:58:24.9 |
HIP 42086 |
19.55 |
| 2026-05-20 00:00 |
08:30:54.12 |
+69:58:07.8 |
HIP 42086 |
19.42 |
| 2026-05-20 12:00 |
08:30:55.72 |
+69:57:50.8 |
HIP 42086 |
19.28 |
| 2026-05-21 00:00 |
08:30:57.35 |
+69:57:33.9 |
HIP 42086 |
19.15 |
| 2026-05-21 12:00 |
08:30:59.02 |
+69:57:16.9 |
HIP 42086 |
19.02 |
| 2026-05-22 00:00 |
08:31:00.71 |
+69:57:00.0 |
HIP 42086 |
18.89 |
| 2026-05-22 12:00 |
08:31:02.44 |
+69:56:43.2 |
HIP 42086 |
18.77 |
| 2026-05-23 00:00 |
08:31:04.20 |
+69:56:26.3 |
HIP 42086 |
18.64 |
| 2026-05-23 12:00 |
08:31:05.99 |
+69:56:09.6 |
HIP 42086 |
18.52 |
| 2026-05-24 00:00 |
08:31:07.81 |
+69:55:52.8 |
HIP 42086 |
18.40 |
| 2026-05-24 12:00 |
08:31:09.66 |
+69:55:36.1 |
HIP 42086 |
18.28 |
| 2026-05-25 00:00 |
08:31:11.54 |
+69:55:19.5 |
HIP 42086 |
18.16 |
| 2026-05-25 12:00 |
08:31:13.45 |
+69:55:02.9 |
HIP 42086 |
18.04 |
| 2026-05-26 00:00 |
08:31:15.39 |
+69:54:46.3 |
HIP 42086 |
17.93 |
| 2026-05-26 12:00 |
08:31:17.36 |
+69:54:29.8 |
HIP 42086 |
17.82 |
| 2026-05-27 00:00 |
08:31:19.36 |
+69:54:13.3 |
HIP 42086 |
17.71 |
| 2026-05-27 12:00 |
08:31:21.39 |
+69:53:56.9 |
HIP 42086 |
17.61 |
| 2026-05-28 00:00 |
08:31:23.45 |
+69:53:40.6 |
HIP 42086 |
17.50 |
| 2026-05-28 12:00 |
08:31:25.54 |
+69:53:24.2 |
HIP 42086 |
17.40 |
| 2026-05-29 00:00 |
08:31:27.66 |
+69:53:08.0 |
HIP 42086 |
17.31 |
| 2026-05-29 12:00 |
08:31:29.80 |
+69:52:51.8 |
HIP 42086 |
17.21 |
| 2026-05-30 00:00 |
08:31:31.98 |
+69:52:35.6 |
HIP 42086 |
17.12 |
| 2026-05-30 12:00 |
08:31:34.18 |
+69:52:19.5 |
HIP 42086 |
17.03 |
| 2026-05-31 00:00 |
08:31:36.41 |
+69:52:03.5 |
HIP 42086 |
16.95 |
| 2026-05-31 12:00 |
08:31:38.67 |
+69:51:47.5 |
HIP 42086 |
16.87 |
| 2026-06-01 00:00 |
08:31:40.96 |
+69:51:31.6 |
HIP 42086 |
16.79 |
| 2026-06-01 12:00 |
08:31:43.28 |
+69:51:15.7 |
HIP 42086 |
16.71 |
| 2026-06-02 00:00 |
08:31:45.62 |
+69:51:00.0 |
HIP 42086 |
16.64 |