| Parameter |
Value |
| 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 |
Osculating Elements
| Parameter |
Value |
| 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 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.811 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.811 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.983 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
22:07:32.59 |
-45:16:44.6 |
HIP 109166 |
10.62 |
| 2026-06-01 12:00 |
22:07:30.25 |
-45:17:36.9 |
HIP 109166 |
9.76 |
| 2026-06-02 00:00 |
22:07:27.84 |
-45:18:29.4 |
HIP 109166 |
8.90 |
| 2026-06-02 12:00 |
22:07:25.36 |
-45:19:22.0 |
HIP 109166 |
8.06 |
| 2026-06-03 00:00 |
22:07:22.81 |
-45:20:14.8 |
HIP 109166 |
7.25 |
| 2026-06-03 12:00 |
22:07:20.19 |
-45:21:07.7 |
HIP 109166 |
6.46 |
| 2026-06-04 00:00 |
22:07:17.49 |
-45:22:00.8 |
HIP 109166 |
5.73 |
| 2026-06-04 12:00 |
22:07:14.73 |
-45:22:54.0 |
HIP 109166 |
5.09 |
| 2026-06-05 00:00 |
22:07:11.90 |
-45:23:47.3 |
HIP 109166 |
4.56 |
| 2026-06-05 12:00 |
22:07:08.99 |
-45:24:40.8 |
HIP 109166 |
4.21 |
| 2026-06-06 00:00 |
22:07:06.01 |
-45:25:34.4 |
HIP 109166 |
4.08 |
| 2026-06-06 12:00 |
22:07:02.97 |
-45:26:28.2 |
HIP 109166 |
4.20 |
| 2026-06-07 00:00 |
22:06:59.85 |
-45:27:22.0 |
HIP 109166 |
4.56 |
| 2026-06-07 12:00 |
22:06:56.67 |
-45:28:16.0 |
HIP 109166 |
5.11 |
| 2026-06-08 00:00 |
22:06:53.41 |
-45:29:10.1 |
HIP 109166 |
5.81 |
| 2026-06-08 12:00 |
22:06:50.08 |
-45:30:04.3 |
HIP 109166 |
6.60 |
| 2026-06-09 00:00 |
22:06:46.68 |
-45:30:58.6 |
HIP 109166 |
7.47 |
| 2026-06-09 12:00 |
22:06:43.21 |
-45:31:53.0 |
HIP 109166 |
8.39 |
| 2026-06-10 00:00 |
22:06:39.68 |
-45:32:47.4 |
HIP 109166 |
9.35 |
| 2026-06-10 12:00 |
22:06:36.07 |
-45:33:42.0 |
HIP 109166 |
10.34 |
| 2026-06-11 00:00 |
22:06:32.39 |
-45:34:36.7 |
HIP 109166 |
11.36 |
| 2026-06-11 12:00 |
22:06:28.64 |
-45:35:31.4 |
HIP 109166 |
12.39 |
| 2026-06-12 00:00 |
22:06:24.82 |
-45:36:26.2 |
HIP 109166 |
13.45 |
| 2026-06-12 12:00 |
22:06:20.93 |
-45:37:21.1 |
HIP 109166 |
14.52 |
| 2026-06-13 00:00 |
22:06:16.98 |
-45:38:16.1 |
HIP 109166 |
15.61 |
| 2026-06-13 12:00 |
22:06:12.95 |
-45:39:11.1 |
HIP 108994 |
15.94 |
| 2026-06-14 00:00 |
22:06:08.85 |
-45:40:06.1 |
HIP 108994 |
14.94 |
| 2026-06-14 12:00 |
22:06:04.69 |
-45:41:01.2 |
HIP 108994 |
13.95 |
| 2026-06-15 00:00 |
22:06:00.45 |
-45:41:56.4 |
HIP 108994 |
12.97 |
| 2026-06-15 12:00 |
22:05:56.15 |
-45:42:51.6 |
HIP 108994 |
12.02 |
| 2026-06-16 00:00 |
22:05:51.78 |
-45:43:46.8 |
HIP 108994 |
11.10 |
| 2026-06-16 12:00 |
22:05:47.34 |
-45:44:42.0 |
HIP 108994 |
10.23 |
| 2026-06-17 00:00 |
22:05:42.83 |
-45:45:37.3 |
HIP 108994 |
9.43 |
| 2026-06-17 12:00 |
22:05:38.25 |
-45:46:32.6 |
HIP 108994 |
8.70 |
| 2026-06-18 00:00 |
22:05:33.61 |
-45:47:27.9 |
HIP 108994 |
8.09 |
| 2026-06-18 12:00 |
22:05:28.90 |
-45:48:23.2 |
HIP 108994 |
7.61 |
| 2026-06-19 00:00 |
22:05:24.12 |
-45:49:18.5 |
HIP 108994 |
7.30 |
| 2026-06-19 12:00 |
22:05:19.27 |
-45:50:13.8 |
HIP 108994 |
7.19 |
| 2026-06-20 00:00 |
22:05:14.36 |
-45:51:09.0 |
HIP 108994 |
7.29 |
| 2026-06-20 12:00 |
22:05:09.39 |
-45:52:04.3 |
HIP 108994 |
7.59 |
| 2026-06-21 00:00 |
22:05:04.34 |
-45:52:59.6 |
HIP 108994 |
8.08 |
| 2026-06-21 12:00 |
22:04:59.23 |
-45:53:54.8 |
HIP 108994 |
8.73 |
| 2026-06-22 00:00 |
22:04:54.06 |
-45:54:50.0 |
HIP 108994 |
9.50 |