メタデータ
| 項目 |
値 |
| Designation |
C/1978 C1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-03-17T16:34:51.617280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
9.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1978-02-23.0000000 |
| e |
1.00000000 |
| q (au) |
0.436574 |
| a (au) |
- |
| i (deg) |
51.086724 |
| Ω (om, deg) |
260.497948 |
| ω (w, deg) |
48.706509 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (7.306 + 3.467\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.306 |
| n |
3.467 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.971 |
| 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) |
| 2026-06-01 00:00 |
07:01:42.06 |
-07:06:01.9 |
HIP 33840 |
10.19 |
| 2026-06-01 12:00 |
07:01:43.36 |
-07:05:57.4 |
HIP 33840 |
10.22 |
| 2026-06-02 00:00 |
07:01:44.68 |
-07:05:52.9 |
HIP 33840 |
10.27 |
| 2026-06-02 12:00 |
07:01:46.00 |
-07:05:48.6 |
HIP 33840 |
10.33 |
| 2026-06-03 00:00 |
07:01:47.33 |
-07:05:44.4 |
HIP 33840 |
10.40 |
| 2026-06-03 12:00 |
07:01:48.66 |
-07:05:40.2 |
HIP 33840 |
10.48 |
| 2026-06-04 00:00 |
07:01:50.01 |
-07:05:36.1 |
HIP 33840 |
10.58 |
| 2026-06-04 12:00 |
07:01:51.36 |
-07:05:32.2 |
HIP 33840 |
10.69 |
| 2026-06-05 00:00 |
07:01:52.71 |
-07:05:28.3 |
HIP 33840 |
10.81 |
| 2026-06-05 12:00 |
07:01:54.07 |
-07:05:24.5 |
HIP 33840 |
10.94 |
| 2026-06-06 00:00 |
07:01:55.44 |
-07:05:20.8 |
HIP 33840 |
11.08 |
| 2026-06-06 12:00 |
07:01:56.82 |
-07:05:17.2 |
HIP 33840 |
11.24 |
| 2026-06-07 00:00 |
07:01:58.20 |
-07:05:13.7 |
HIP 33840 |
11.40 |
| 2026-06-07 12:00 |
07:01:59.59 |
-07:05:10.3 |
HIP 33840 |
11.57 |
| 2026-06-08 00:00 |
07:02:00.98 |
-07:05:07.0 |
HIP 33840 |
11.76 |
| 2026-06-08 12:00 |
07:02:02.38 |
-07:05:03.8 |
HIP 33840 |
11.95 |
| 2026-06-09 00:00 |
07:02:03.78 |
-07:05:00.7 |
HIP 33840 |
12.16 |
| 2026-06-09 12:00 |
07:02:05.19 |
-07:04:57.7 |
HIP 33840 |
12.37 |
| 2026-06-10 00:00 |
07:02:06.61 |
-07:04:54.8 |
HIP 33840 |
12.59 |
| 2026-06-10 12:00 |
07:02:08.03 |
-07:04:52.0 |
HIP 33840 |
12.82 |
| 2026-06-11 00:00 |
07:02:09.46 |
-07:04:49.2 |
HIP 33840 |
13.06 |
| 2026-06-11 12:00 |
07:02:10.89 |
-07:04:46.6 |
HIP 33840 |
13.30 |
| 2026-06-12 00:00 |
07:02:12.33 |
-07:04:44.1 |
HIP 33840 |
13.55 |
| 2026-06-12 12:00 |
07:02:13.77 |
-07:04:41.6 |
HIP 33840 |
13.81 |
| 2026-06-13 00:00 |
07:02:15.22 |
-07:04:39.3 |
HIP 33840 |
14.08 |
| 2026-06-13 12:00 |
07:02:16.68 |
-07:04:37.1 |
HIP 33840 |
14.35 |
| 2026-06-14 00:00 |
07:02:18.14 |
-07:04:34.9 |
HIP 33840 |
14.62 |
| 2026-06-14 12:00 |
07:02:19.60 |
-07:04:32.9 |
HIP 33840 |
14.91 |
| 2026-06-15 00:00 |
07:02:21.07 |
-07:04:30.9 |
HIP 33840 |
15.19 |
| 2026-06-15 12:00 |
07:02:22.54 |
-07:04:29.1 |
HIP 33840 |
15.49 |
| 2026-06-16 00:00 |
07:02:24.02 |
-07:04:27.4 |
HIP 33840 |
15.78 |
| 2026-06-16 12:00 |
07:02:25.50 |
-07:04:25.7 |
HIP 33840 |
16.09 |
| 2026-06-17 00:00 |
07:02:26.98 |
-07:04:24.2 |
HIP 33840 |
16.39 |
| 2026-06-17 12:00 |
07:02:28.47 |
-07:04:22.7 |
HIP 33840 |
16.71 |
| 2026-06-18 00:00 |
07:02:29.96 |
-07:04:21.4 |
HIP 33955 |
16.77 |
| 2026-06-18 12:00 |
07:02:31.46 |
-07:04:20.1 |
HIP 33955 |
16.68 |
| 2026-06-19 00:00 |
07:02:32.96 |
-07:04:19.0 |
HIP 33955 |
16.60 |
| 2026-06-19 12:00 |
07:02:34.47 |
-07:04:17.9 |
HIP 33955 |
16.53 |
| 2026-06-20 00:00 |
07:02:35.98 |
-07:04:17.0 |
HIP 33955 |
16.47 |
| 2026-06-20 12:00 |
07:02:37.49 |
-07:04:16.1 |
HIP 33955 |
16.42 |
| 2026-06-21 00:00 |
07:02:39.00 |
-07:04:15.4 |
HIP 33955 |
16.38 |
| 2026-06-21 12:00 |
07:02:40.52 |
-07:04:14.7 |
HIP 33955 |
16.35 |
| 2026-06-22 00:00 |
07:02:42.04 |
-07:04:14.2 |
HIP 34027 |
16.03 |