C/2019 F1 (ATLAS-Africano)
| Parameter |
Value |
| Designation |
C/2019 F1 (ATLAS-Africano) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-06-22T19:03:30.551040Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:29Z |
| Obs used |
1964 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
5.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-03-29T10:03:21.600000Z |
| Discovery magnitude (MPC) |
18.40 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-10-21.0000000 |
| e |
1.00348898 |
| q (au) |
3.595914 |
| a (au) |
-1030.647736 |
| i (deg) |
54.175708 |
| Ω (om, deg) |
38.726260 |
| ω (w, deg) |
251.113825 |
| M (ma, deg) |
-0.007292 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.031 + 2.895\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.031 |
| n |
2.895 |
| gf |
0.914 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-02-08 |
2019-10-14 |
+8.8747 |
-7.840 |
| 2019-10-14 |
2020-05-26 |
-6.5457 |
+4.593 |
| 2020-05-26 |
2021-06-18 |
-3.0290 |
+1.838 |
| 2021-06-27 |
2022-08-28 |
+0.5643 |
+0.081 |
| 2022-08-28 |
2022-12-25 |
-8.8752 |
+7.089 |
| 2022-12-25 |
2024-01-31 |
+9.9762 |
-7.455 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
02:17:01.23 |
+20:10:32.6 |
HIP 10732 |
22.67 |
| 2026-02-03 12:00 |
02:17:03.14 |
+20:10:50.9 |
HIP 10732 |
22.59 |
| 2026-02-04 00:00 |
02:17:05.14 |
+20:11:09.7 |
HIP 10732 |
22.52 |
| 2026-02-04 12:00 |
02:17:07.20 |
+20:11:28.8 |
HIP 10732 |
22.45 |
| 2026-02-05 00:00 |
02:17:09.35 |
+20:11:48.2 |
HIP 10732 |
22.39 |
| 2026-02-05 12:00 |
02:17:11.56 |
+20:12:08.1 |
HIP 10732 |
22.34 |
| 2026-02-06 00:00 |
02:17:13.86 |
+20:12:28.3 |
HIP 10732 |
22.31 |
| 2026-02-06 12:00 |
02:17:16.23 |
+20:12:48.9 |
HIP 10732 |
22.29 |
| 2026-02-07 00:00 |
02:17:18.67 |
+20:13:09.9 |
HIP 10732 |
22.28 |
| 2026-02-07 12:00 |
02:17:21.19 |
+20:13:31.2 |
HIP 10732 |
22.29 |
| 2026-02-08 00:00 |
02:17:23.78 |
+20:13:52.9 |
HIP 10732 |
22.32 |
| 2026-02-08 12:00 |
02:17:26.45 |
+20:14:14.9 |
HIP 10732 |
22.37 |
| 2026-02-09 00:00 |
02:17:29.19 |
+20:14:37.4 |
HIP 10732 |
22.44 |
| 2026-02-09 12:00 |
02:17:32.01 |
+20:15:00.2 |
HIP 10732 |
22.54 |
| 2026-02-10 00:00 |
02:17:34.90 |
+20:15:23.4 |
HIP 10732 |
22.66 |
| 2026-02-10 12:00 |
02:17:37.86 |
+20:15:46.9 |
HIP 10732 |
22.80 |
| 2026-02-11 00:00 |
02:17:40.89 |
+20:16:10.8 |
HIP 10732 |
22.98 |
| 2026-02-11 12:00 |
02:17:43.99 |
+20:16:35.1 |
HIP 10732 |
23.18 |
| 2026-02-12 00:00 |
02:17:47.17 |
+20:16:59.7 |
HIP 10732 |
23.42 |
| 2026-02-12 12:00 |
02:17:50.42 |
+20:17:24.7 |
HIP 10732 |
23.69 |
| 2026-02-13 00:00 |
02:17:53.74 |
+20:17:50.1 |
HIP 10732 |
23.98 |
| 2026-02-13 12:00 |
02:17:57.13 |
+20:18:15.8 |
HIP 10732 |
24.32 |
| 2026-02-14 00:00 |
02:18:00.59 |
+20:18:41.9 |
HIP 10732 |
24.68 |
| 2026-02-14 12:00 |
02:18:04.13 |
+20:19:08.3 |
HIP 10732 |
25.08 |
| 2026-02-15 00:00 |
02:18:07.73 |
+20:19:35.1 |
HIP 10732 |
25.52 |
| 2026-02-15 12:00 |
02:18:11.40 |
+20:20:02.3 |
HIP 10732 |
25.98 |
| 2026-02-16 00:00 |
02:18:15.14 |
+20:20:29.8 |
HIP 10732 |
26.49 |
| 2026-02-16 12:00 |
02:18:18.95 |
+20:20:57.7 |
HIP 10732 |
27.02 |
| 2026-02-17 00:00 |
02:18:22.82 |
+20:21:25.9 |
HIP 10732 |
27.60 |
| 2026-02-17 12:00 |
02:18:26.77 |
+20:21:54.5 |
HIP 10732 |
28.20 |
| 2026-02-18 00:00 |
02:18:30.78 |
+20:22:23.5 |
HIP 10732 |
28.84 |
| 2026-02-18 12:00 |
02:18:34.86 |
+20:22:52.8 |
HIP 10732 |
29.51 |
| 2026-02-19 00:00 |
02:18:39.01 |
+20:23:22.4 |
HIP 10732 |
30.22 |
| 2026-02-19 12:00 |
02:18:43.22 |
+20:23:52.4 |
HIP 10732 |
30.96 |
| 2026-02-20 00:00 |
02:18:47.50 |
+20:24:22.8 |
HIP 10732 |
31.73 |
| 2026-02-20 12:00 |
02:18:51.85 |
+20:24:53.4 |
HIP 10732 |
32.53 |
| 2026-02-21 00:00 |
02:18:56.26 |
+20:25:24.5 |
HIP 10732 |
33.36 |
| 2026-02-21 12:00 |
02:19:00.73 |
+20:25:55.8 |
HIP 10732 |
34.22 |
| 2026-02-22 00:00 |
02:19:05.27 |
+20:26:27.6 |
HIP 10732 |
35.11 |
| 2026-02-22 12:00 |
02:19:09.87 |
+20:26:59.6 |
HIP 10732 |
36.03 |
| 2026-02-23 00:00 |
02:19:14.53 |
+20:27:32.0 |
HIP 10732 |
36.97 |
| 2026-02-23 12:00 |
02:19:19.26 |
+20:28:04.7 |
HIP 10732 |
37.94 |
| 2026-02-24 00:00 |
02:19:24.05 |
+20:28:37.8 |
HIP 11032 |
37.69 |