| 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 · 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) |
| 2026-03-26 00:00 |
22:02:55.14 |
-44:07:08.5 |
HIP 108913 |
9.54 |
| 2026-03-26 12:00 |
22:03:00.82 |
-44:07:12.3 |
HIP 108913 |
8.66 |
| 2026-03-27 00:00 |
22:03:06.46 |
-44:07:16.6 |
HIP 108913 |
7.83 |
| 2026-03-27 12:00 |
22:03:12.07 |
-44:07:21.3 |
HIP 108913 |
7.05 |
| 2026-03-28 00:00 |
22:03:17.63 |
-44:07:26.6 |
HIP 108913 |
6.36 |
| 2026-03-28 12:00 |
22:03:23.15 |
-44:07:32.2 |
HIP 108913 |
5.76 |
| 2026-03-29 00:00 |
22:03:28.63 |
-44:07:38.3 |
HIP 108913 |
5.30 |
| 2026-03-29 12:00 |
22:03:34.07 |
-44:07:44.9 |
HIP 108913 |
5.00 |
| 2026-03-30 00:00 |
22:03:39.47 |
-44:07:52.0 |
HIP 108913 |
4.89 |
| 2026-03-30 12:00 |
22:03:44.82 |
-44:07:59.5 |
HIP 108913 |
4.99 |
| 2026-03-31 00:00 |
22:03:50.13 |
-44:08:07.4 |
HIP 108913 |
5.27 |
| 2026-03-31 12:00 |
22:03:55.40 |
-44:08:15.8 |
HIP 108913 |
5.70 |
| 2026-04-01 00:00 |
22:04:00.63 |
-44:08:24.7 |
HIP 108913 |
6.25 |
| 2026-04-01 12:00 |
22:04:05.81 |
-44:08:34.0 |
HIP 108913 |
6.90 |
| 2026-04-02 00:00 |
22:04:10.95 |
-44:08:43.8 |
HIP 108913 |
7.60 |
| 2026-04-02 12:00 |
22:04:16.04 |
-44:08:54.0 |
HIP 108913 |
8.35 |
| 2026-04-03 00:00 |
22:04:21.09 |
-44:09:04.7 |
HIP 108913 |
9.14 |
| 2026-04-03 12:00 |
22:04:26.10 |
-44:09:15.8 |
HIP 108913 |
9.94 |
| 2026-04-04 00:00 |
22:04:31.05 |
-44:09:27.4 |
HIP 108913 |
10.76 |
| 2026-04-04 12:00 |
22:04:35.97 |
-44:09:39.4 |
HIP 108913 |
11.60 |
| 2026-04-05 00:00 |
22:04:40.83 |
-44:09:51.9 |
HIP 108913 |
12.44 |
| 2026-04-05 12:00 |
22:04:45.65 |
-44:10:04.8 |
HIP 108913 |
13.28 |
| 2026-04-06 00:00 |
22:04:50.43 |
-44:10:18.2 |
HIP 108913 |
14.13 |
| 2026-04-06 12:00 |
22:04:55.15 |
-44:10:32.1 |
HIP 108913 |
14.97 |
| 2026-04-07 00:00 |
22:04:59.83 |
-44:10:46.4 |
HIP 108913 |
15.82 |
| 2026-04-07 12:00 |
22:05:04.46 |
-44:11:01.1 |
HIP 108913 |
16.67 |
| 2026-04-08 00:00 |
22:05:09.04 |
-44:11:16.3 |
HIP 109108 |
16.58 |
| 2026-04-08 12:00 |
22:05:13.58 |
-44:11:31.9 |
HIP 109108 |
16.32 |
| 2026-04-09 00:00 |
22:05:18.06 |
-44:11:48.0 |
HIP 109108 |
16.12 |
| 2026-04-09 12:00 |
22:05:22.49 |
-44:12:04.6 |
HIP 109108 |
15.97 |
| 2026-04-10 00:00 |
22:05:26.88 |
-44:12:21.5 |
HIP 109108 |
15.87 |
| 2026-04-10 12:00 |
22:05:31.21 |
-44:12:39.0 |
HIP 109108 |
15.83 |
| 2026-04-11 00:00 |
22:05:35.50 |
-44:12:56.8 |
HIP 109108 |
15.84 |
| 2026-04-11 12:00 |
22:05:39.73 |
-44:13:15.1 |
HIP 109108 |
15.90 |
| 2026-04-12 00:00 |
22:05:43.91 |
-44:13:33.9 |
HIP 109108 |
16.01 |
| 2026-04-12 12:00 |
22:05:48.04 |
-44:13:53.1 |
HIP 109108 |
16.18 |
| 2026-04-13 00:00 |
22:05:52.11 |
-44:14:12.8 |
HIP 109108 |
16.39 |
| 2026-04-13 12:00 |
22:05:56.14 |
-44:14:32.8 |
HIP 109210 |
16.57 |
| 2026-04-14 00:00 |
22:06:00.11 |
-44:14:53.4 |
HIP 109210 |
15.87 |
| 2026-04-14 12:00 |
22:06:04.02 |
-44:15:14.3 |
HIP 109210 |
15.19 |
| 2026-04-15 00:00 |
22:06:07.89 |
-44:15:35.7 |
HIP 109210 |
14.53 |
| 2026-04-15 12:00 |
22:06:11.70 |
-44:15:57.6 |
HIP 109210 |
13.89 |
| 2026-04-16 00:00 |
22:06:15.45 |
-44:16:19.9 |
HIP 109210 |
13.28 |