C/1978 C1 (Bradfield)
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) |
| 2026-02-03 00:00 |
07:01:53.62 |
-07:45:07.1 |
HIP 33968 |
28.62 |
| 2026-02-03 12:00 |
07:01:52.20 |
-07:44:59.2 |
HIP 33968 |
28.91 |
| 2026-02-04 00:00 |
07:01:50.78 |
-07:44:51.3 |
HIP 33968 |
29.21 |
| 2026-02-04 12:00 |
07:01:49.37 |
-07:44:43.2 |
HIP 33968 |
29.51 |
| 2026-02-05 00:00 |
07:01:47.97 |
-07:44:35.1 |
HIP 33968 |
29.81 |
| 2026-02-05 12:00 |
07:01:46.57 |
-07:44:26.9 |
HIP 33968 |
30.11 |
| 2026-02-06 00:00 |
07:01:45.19 |
-07:44:18.6 |
HIP 33968 |
30.41 |
| 2026-02-06 12:00 |
07:01:43.81 |
-07:44:10.2 |
HIP 33968 |
30.72 |
| 2026-02-07 00:00 |
07:01:42.44 |
-07:44:01.8 |
HIP 33968 |
31.02 |
| 2026-02-07 12:00 |
07:01:41.07 |
-07:43:53.3 |
HIP 33968 |
31.33 |
| 2026-02-08 00:00 |
07:01:39.72 |
-07:43:44.7 |
HIP 33968 |
31.64 |
| 2026-02-08 12:00 |
07:01:38.37 |
-07:43:36.0 |
HIP 33968 |
31.95 |
| 2026-02-09 00:00 |
07:01:37.03 |
-07:43:27.2 |
HIP 33968 |
32.26 |
| 2026-02-09 12:00 |
07:01:35.70 |
-07:43:18.4 |
HIP 33968 |
32.57 |
| 2026-02-10 00:00 |
07:01:34.38 |
-07:43:09.5 |
HIP 33968 |
32.88 |
| 2026-02-10 12:00 |
07:01:33.07 |
-07:43:00.5 |
HIP 33968 |
33.20 |
| 2026-02-11 00:00 |
07:01:31.77 |
-07:42:51.5 |
HIP 33968 |
33.51 |
| 2026-02-11 12:00 |
07:01:30.47 |
-07:42:42.3 |
HIP 33968 |
33.82 |
| 2026-02-12 00:00 |
07:01:29.19 |
-07:42:33.1 |
HIP 33968 |
34.14 |
| 2026-02-12 12:00 |
07:01:27.91 |
-07:42:23.9 |
HIP 33968 |
34.45 |
| 2026-02-13 00:00 |
07:01:26.65 |
-07:42:14.5 |
HIP 33968 |
34.77 |
| 2026-02-13 12:00 |
07:01:25.39 |
-07:42:05.1 |
HIP 33968 |
35.08 |
| 2026-02-14 00:00 |
07:01:24.14 |
-07:41:55.6 |
HIP 33968 |
35.40 |
| 2026-02-14 12:00 |
07:01:22.90 |
-07:41:46.1 |
HIP 33968 |
35.71 |
| 2026-02-15 00:00 |
07:01:21.68 |
-07:41:36.4 |
HIP 33968 |
36.03 |
| 2026-02-15 12:00 |
07:01:20.46 |
-07:41:26.8 |
HIP 33968 |
36.34 |
| 2026-02-16 00:00 |
07:01:19.25 |
-07:41:17.0 |
HIP 33968 |
36.66 |
| 2026-02-16 12:00 |
07:01:18.05 |
-07:41:07.2 |
HIP 33968 |
36.97 |
| 2026-02-17 00:00 |
07:01:16.86 |
-07:40:57.3 |
HIP 33968 |
37.29 |
| 2026-02-17 12:00 |
07:01:15.68 |
-07:40:47.4 |
HIP 33968 |
37.60 |
| 2026-02-18 00:00 |
07:01:14.51 |
-07:40:37.3 |
HIP 33968 |
37.92 |
| 2026-02-18 12:00 |
07:01:13.36 |
-07:40:27.3 |
HIP 33968 |
38.23 |
| 2026-02-19 00:00 |
07:01:12.21 |
-07:40:17.1 |
HIP 33968 |
38.54 |
| 2026-02-19 12:00 |
07:01:11.07 |
-07:40:06.9 |
HIP 33968 |
38.85 |
| 2026-02-20 00:00 |
07:01:09.95 |
-07:39:56.7 |
HIP 33968 |
39.16 |
| 2026-02-20 12:00 |
07:01:08.83 |
-07:39:46.4 |
HIP 33968 |
39.47 |
| 2026-02-21 00:00 |
07:01:07.73 |
-07:39:36.0 |
HIP 33968 |
39.78 |
| 2026-02-21 12:00 |
07:01:06.63 |
-07:39:25.6 |
HIP 33968 |
40.09 |
| 2026-02-22 00:00 |
07:01:05.55 |
-07:39:15.1 |
HIP 33968 |
40.40 |
| 2026-02-22 12:00 |
07:01:04.48 |
-07:39:04.6 |
HIP 33968 |
40.71 |
| 2026-02-23 00:00 |
07:01:03.42 |
-07:38:54.0 |
HIP 33968 |
41.01 |
| 2026-02-23 12:00 |
07:01:02.37 |
-07:38:43.4 |
HIP 33968 |
41.32 |
| 2026-02-24 00:00 |
07:01:01.33 |
-07:38:32.7 |
HIP 33968 |
41.62 |