| 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) |
| 2026-09-20 00:00 |
21:40:04.52 |
-47:20:05.3 |
HIP 107073 |
14.34 |
| 2026-09-20 12:00 |
21:39:56.86 |
-47:19:51.6 |
HIP 107073 |
15.47 |
| 2026-09-21 00:00 |
21:39:49.24 |
-47:19:37.4 |
HIP 107073 |
16.64 |
| 2026-09-21 12:00 |
21:39:41.67 |
-47:19:22.7 |
HIP 107073 |
17.82 |
| 2026-09-22 00:00 |
21:39:34.16 |
-47:19:07.5 |
HIP 107073 |
19.01 |
| 2026-09-22 12:00 |
21:39:26.69 |
-47:18:51.8 |
HIP 107073 |
20.21 |
| 2026-09-23 00:00 |
21:39:19.28 |
-47:18:35.6 |
HIP 107073 |
21.43 |
| 2026-09-23 12:00 |
21:39:11.92 |
-47:18:19.0 |
HIP 107073 |
22.64 |
| 2026-09-24 00:00 |
21:39:04.61 |
-47:18:01.8 |
HIP 107073 |
23.86 |
| 2026-09-24 12:00 |
21:38:57.35 |
-47:17:44.2 |
HIP 107073 |
25.08 |
| 2026-09-25 00:00 |
21:38:50.15 |
-47:17:26.0 |
HIP 107073 |
26.30 |
| 2026-09-25 12:00 |
21:38:43.00 |
-47:17:07.4 |
HIP 107073 |
27.52 |
| 2026-09-26 00:00 |
21:38:35.90 |
-47:16:48.3 |
HIP 107073 |
28.73 |
| 2026-09-26 12:00 |
21:38:28.86 |
-47:16:28.8 |
HIP 107073 |
29.95 |
| 2026-09-27 00:00 |
21:38:21.88 |
-47:16:08.8 |
HIP 107073 |
31.16 |
| 2026-09-27 12:00 |
21:38:14.95 |
-47:15:48.2 |
HIP 107073 |
32.37 |
| 2026-09-28 00:00 |
21:38:08.08 |
-47:15:27.3 |
HIP 107073 |
33.57 |
| 2026-09-28 12:00 |
21:38:01.26 |
-47:15:05.8 |
HIP 107073 |
34.77 |
| 2026-09-29 00:00 |
21:37:54.50 |
-47:14:43.9 |
HIP 107073 |
35.96 |
| 2026-09-29 12:00 |
21:37:47.80 |
-47:14:21.6 |
HIP 107073 |
37.15 |
| 2026-09-30 00:00 |
21:37:41.16 |
-47:13:58.7 |
HIP 106640 |
37.06 |
| 2026-09-30 12:00 |
21:37:34.57 |
-47:13:35.4 |
HIP 106640 |
36.20 |
| 2026-10-01 00:00 |
21:37:28.05 |
-47:13:11.7 |
HIP 106640 |
35.36 |
| 2026-10-01 12:00 |
21:37:21.58 |
-47:12:47.5 |
HIP 106640 |
34.54 |
| 2026-10-02 00:00 |
21:37:15.17 |
-47:12:22.8 |
HIP 106640 |
33.74 |
| 2026-10-02 12:00 |
21:37:08.83 |
-47:11:57.8 |
HIP 106640 |
32.95 |
| 2026-10-03 00:00 |
21:37:02.54 |
-47:11:32.2 |
HIP 106640 |
32.19 |
| 2026-10-03 12:00 |
21:36:56.32 |
-47:11:06.2 |
HIP 106640 |
31.44 |
| 2026-10-04 00:00 |
21:36:50.15 |
-47:10:39.8 |
HIP 106640 |
30.71 |
| 2026-10-04 12:00 |
21:36:44.05 |
-47:10:12.9 |
HIP 106640 |
30.01 |
| 2026-10-05 00:00 |
21:36:38.01 |
-47:09:45.6 |
HIP 106640 |
29.33 |
| 2026-10-05 12:00 |
21:36:32.03 |
-47:09:17.9 |
HIP 106640 |
28.67 |
| 2026-10-06 00:00 |
21:36:26.12 |
-47:08:49.7 |
HIP 106640 |
28.03 |
| 2026-10-06 12:00 |
21:36:20.27 |
-47:08:21.1 |
HIP 106640 |
27.42 |
| 2026-10-07 00:00 |
21:36:14.49 |
-47:07:52.0 |
HIP 106640 |
26.83 |
| 2026-10-07 12:00 |
21:36:08.77 |
-47:07:22.6 |
HIP 106640 |
26.27 |
| 2026-10-08 00:00 |
21:36:03.11 |
-47:06:52.7 |
HIP 106640 |
25.74 |
| 2026-10-08 12:00 |
21:35:57.52 |
-47:06:22.4 |
HIP 106640 |
25.24 |
| 2026-10-09 00:00 |
21:35:51.99 |
-47:05:51.7 |
HIP 106640 |
24.76 |
| 2026-10-09 12:00 |
21:35:46.54 |
-47:05:20.6 |
HIP 106640 |
24.32 |
| 2026-10-10 00:00 |
21:35:41.14 |
-47:04:49.0 |
HIP 106640 |
23.91 |
| 2026-10-10 12:00 |
21:35:35.82 |
-47:04:17.1 |
HIP 106640 |
23.53 |
| 2026-10-11 00:00 |
21:35:30.56 |
-47:03:44.7 |
HIP 106640 |
23.18 |