C/2019 B1 (Africano)
| 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) |
| 2026-02-03 00:00 |
21:51:10.11 |
-44:39:22.3 |
HIP 107850 |
13.03 |
| 2026-02-03 12:00 |
21:51:17.40 |
-44:38:42.9 |
HIP 107850 |
13.87 |
| 2026-02-04 00:00 |
21:51:24.70 |
-44:38:03.8 |
HIP 107850 |
14.80 |
| 2026-02-04 12:00 |
21:51:32.01 |
-44:37:25.1 |
HIP 107850 |
15.80 |
| 2026-02-05 00:00 |
21:51:39.33 |
-44:36:46.8 |
HIP 107850 |
16.86 |
| 2026-02-05 12:00 |
21:51:46.65 |
-44:36:08.8 |
HIP 107850 |
17.97 |
| 2026-02-06 00:00 |
21:51:53.98 |
-44:35:31.2 |
HIP 107850 |
19.12 |
| 2026-02-06 12:00 |
21:52:01.32 |
-44:34:53.9 |
HIP 107850 |
20.30 |
| 2026-02-07 00:00 |
21:52:08.66 |
-44:34:17.0 |
HIP 107850 |
21.51 |
| 2026-02-07 12:00 |
21:52:16.01 |
-44:33:40.4 |
HIP 107850 |
22.75 |
| 2026-02-08 00:00 |
21:52:23.37 |
-44:33:04.2 |
HIP 107850 |
24.00 |
| 2026-02-08 12:00 |
21:52:30.73 |
-44:32:28.4 |
HIP 107850 |
25.27 |
| 2026-02-09 00:00 |
21:52:38.10 |
-44:31:53.0 |
HIP 107850 |
26.55 |
| 2026-02-09 12:00 |
21:52:45.46 |
-44:31:17.9 |
HIP 107850 |
27.84 |
| 2026-02-10 00:00 |
21:52:52.84 |
-44:30:43.2 |
HIP 108194 |
26.95 |
| 2026-02-10 12:00 |
21:53:00.21 |
-44:30:08.9 |
HIP 108194 |
26.01 |
| 2026-02-11 00:00 |
21:53:07.59 |
-44:29:35.0 |
HIP 108194 |
25.10 |
| 2026-02-11 12:00 |
21:53:14.97 |
-44:29:01.4 |
HIP 108194 |
24.24 |
| 2026-02-12 00:00 |
21:53:22.35 |
-44:28:28.2 |
HIP 108194 |
23.44 |
| 2026-02-12 12:00 |
21:53:29.73 |
-44:27:55.4 |
HIP 108194 |
22.69 |
| 2026-02-13 00:00 |
21:53:37.11 |
-44:27:23.0 |
HIP 108194 |
22.00 |
| 2026-02-13 12:00 |
21:53:44.49 |
-44:26:51.0 |
HIP 108194 |
21.38 |
| 2026-02-14 00:00 |
21:53:51.87 |
-44:26:19.3 |
HIP 108194 |
20.84 |
| 2026-02-14 12:00 |
21:53:59.25 |
-44:25:48.1 |
HIP 108194 |
20.37 |
| 2026-02-15 00:00 |
21:54:06.63 |
-44:25:17.3 |
HIP 108194 |
19.99 |
| 2026-02-15 12:00 |
21:54:14.00 |
-44:24:46.8 |
HIP 108194 |
19.69 |
| 2026-02-16 00:00 |
21:54:21.37 |
-44:24:16.8 |
HIP 108194 |
19.49 |
| 2026-02-16 12:00 |
21:54:28.74 |
-44:23:47.1 |
HIP 108194 |
19.38 |
| 2026-02-17 00:00 |
21:54:36.11 |
-44:23:17.8 |
HIP 108194 |
19.36 |
| 2026-02-17 12:00 |
21:54:43.47 |
-44:22:49.0 |
HIP 108194 |
19.44 |
| 2026-02-18 00:00 |
21:54:50.82 |
-44:22:20.5 |
HIP 108194 |
19.62 |
| 2026-02-18 12:00 |
21:54:58.17 |
-44:21:52.5 |
HIP 108194 |
19.88 |
| 2026-02-19 00:00 |
21:55:05.51 |
-44:21:24.9 |
HIP 108337 |
19.90 |
| 2026-02-19 12:00 |
21:55:12.85 |
-44:20:57.7 |
HIP 108337 |
18.55 |
| 2026-02-20 00:00 |
21:55:20.17 |
-44:20:30.8 |
HIP 108337 |
17.20 |
| 2026-02-20 12:00 |
21:55:27.49 |
-44:20:04.4 |
HIP 108337 |
15.85 |
| 2026-02-21 00:00 |
21:55:34.81 |
-44:19:38.5 |
HIP 108337 |
14.52 |
| 2026-02-21 12:00 |
21:55:42.11 |
-44:19:12.9 |
HIP 108337 |
13.20 |
| 2026-02-22 00:00 |
21:55:49.40 |
-44:18:47.7 |
HIP 108337 |
11.88 |
| 2026-02-22 12:00 |
21:55:56.69 |
-44:18:23.0 |
HIP 108337 |
10.59 |
| 2026-02-23 00:00 |
21:56:03.96 |
-44:17:58.7 |
HIP 108337 |
9.32 |
| 2026-02-23 12:00 |
21:56:11.22 |
-44:17:34.8 |
HIP 108337 |
8.07 |
| 2026-02-24 00:00 |
21:56:18.47 |
-44:17:11.3 |
HIP 108337 |
6.87 |