メタデータ
| 項目 |
値 |
| Designation |
C/2019 B1 (Africano) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-03-19T22:08:42.066240Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:11Z |
| Obs used |
161 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-19T11:27:31.680000Z |
| Discovery magnitude (MPC) |
17.80 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-02-10.0000000 |
| e |
0.98972323 |
| q (au) |
1.597291 |
| a (au) |
155.427414 |
| i (deg) |
123.362586 |
| Ω (om, deg) |
290.432385 |
| ω (w, deg) |
174.882827 |
| M (ma, deg) |
359.980711 |
等級
散乱 + 全体線形
$$
M_a = (16.811 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.811 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.983 |
| 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) |
| 2026-07-29 00:00 |
21:55:56.46 |
-46:55:39.0 |
HIP 108258 |
0.17 |
| 2026-07-29 12:00 |
21:55:47.58 |
-46:56:17.8 |
HIP 108258 |
1.48 |
| 2026-07-30 00:00 |
21:55:38.67 |
-46:56:56.3 |
HIP 108258 |
3.13 |
| 2026-07-30 12:00 |
21:55:29.74 |
-46:57:34.3 |
HIP 108258 |
4.78 |
| 2026-07-31 00:00 |
21:55:20.77 |
-46:58:12.0 |
HIP 108159 |
6.14 |
| 2026-07-31 12:00 |
21:55:11.78 |
-46:58:49.2 |
HIP 108159 |
4.52 |
| 2026-08-01 00:00 |
21:55:02.77 |
-46:59:26.1 |
HIP 108159 |
2.93 |
| 2026-08-01 12:00 |
21:54:53.73 |
-47:00:02.6 |
HIP 108159 |
1.49 |
| 2026-08-02 00:00 |
21:54:44.67 |
-47:00:38.6 |
HIP 108159 |
1.14 |
| 2026-08-02 12:00 |
21:54:35.59 |
-47:01:14.2 |
HIP 108159 |
2.43 |
| 2026-08-03 00:00 |
21:54:26.48 |
-47:01:49.4 |
HIP 108159 |
3.99 |
| 2026-08-03 12:00 |
21:54:17.35 |
-47:02:24.2 |
HIP 108159 |
5.61 |
| 2026-08-04 00:00 |
21:54:08.20 |
-47:02:58.6 |
HIP 108159 |
7.25 |
| 2026-08-04 12:00 |
21:53:59.03 |
-47:03:32.5 |
HIP 108159 |
8.90 |
| 2026-08-05 00:00 |
21:53:49.84 |
-47:04:06.1 |
HIP 108159 |
10.55 |
| 2026-08-05 12:00 |
21:53:40.64 |
-47:04:39.1 |
HIP 108159 |
12.20 |
| 2026-08-06 00:00 |
21:53:31.41 |
-47:05:11.8 |
HIP 108159 |
13.86 |
| 2026-08-06 12:00 |
21:53:22.17 |
-47:05:44.0 |
HIP 108159 |
15.51 |
| 2026-08-07 00:00 |
21:53:12.91 |
-47:06:15.7 |
HIP 107965 |
16.84 |
| 2026-08-07 12:00 |
21:53:03.63 |
-47:06:47.1 |
HIP 107965 |
16.55 |
| 2026-08-08 00:00 |
21:52:54.34 |
-47:07:17.9 |
HIP 107965 |
16.42 |
| 2026-08-08 12:00 |
21:52:45.03 |
-47:07:48.3 |
HIP 107965 |
16.45 |
| 2026-08-09 00:00 |
21:52:35.71 |
-47:08:18.3 |
HIP 107965 |
16.63 |
| 2026-08-09 12:00 |
21:52:26.38 |
-47:08:47.8 |
HIP 107965 |
16.98 |
| 2026-08-10 00:00 |
21:52:17.04 |
-47:09:16.8 |
HIP 107965 |
17.47 |
| 2026-08-10 12:00 |
21:52:07.68 |
-47:09:45.4 |
HIP 107965 |
18.09 |
| 2026-08-11 00:00 |
21:51:58.32 |
-47:10:13.5 |
HIP 107965 |
18.83 |
| 2026-08-11 12:00 |
21:51:48.94 |
-47:10:41.1 |
HIP 107965 |
19.68 |
| 2026-08-12 00:00 |
21:51:39.56 |
-47:11:08.2 |
HIP 107965 |
20.62 |
| 2026-08-12 12:00 |
21:51:30.17 |
-47:11:34.9 |
HIP 107965 |
21.63 |
| 2026-08-13 00:00 |
21:51:20.77 |
-47:12:01.1 |
HIP 107965 |
22.72 |
| 2026-08-13 12:00 |
21:51:11.36 |
-47:12:26.8 |
HIP 107965 |
23.87 |
| 2026-08-14 00:00 |
21:51:01.95 |
-47:12:52.0 |
HIP 107965 |
25.07 |
| 2026-08-14 12:00 |
21:50:52.54 |
-47:13:16.7 |
HIP 107965 |
26.31 |
| 2026-08-15 00:00 |
21:50:43.12 |
-47:13:41.0 |
HIP 107649 |
25.42 |
| 2026-08-15 12:00 |
21:50:33.69 |
-47:14:04.7 |
HIP 107649 |
23.78 |
| 2026-08-16 00:00 |
21:50:24.27 |
-47:14:28.0 |
HIP 107649 |
22.14 |
| 2026-08-16 12:00 |
21:50:14.84 |
-47:14:50.7 |
HIP 107649 |
20.50 |
| 2026-08-17 00:00 |
21:50:05.42 |
-47:15:13.0 |
HIP 107649 |
18.86 |
| 2026-08-17 12:00 |
21:49:55.99 |
-47:15:34.7 |
HIP 107649 |
17.22 |
| 2026-08-18 00:00 |
21:49:46.57 |
-47:15:56.0 |
HIP 107649 |
15.59 |
| 2026-08-18 12:00 |
21:49:37.14 |
-47:16:16.7 |
HIP 107649 |
13.96 |
| 2026-08-19 00:00 |
21:49:27.72 |
-47:16:36.9 |
HIP 107649 |
12.33 |