| 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) |
| 2026-03-26 00:00 |
02:25:48.17 |
+21:10:48.0 |
HIP 11315 |
34.89 |
| 2026-03-26 12:00 |
02:25:55.89 |
+21:11:38.1 |
HIP 11315 |
34.21 |
| 2026-03-27 00:00 |
02:26:03.65 |
+21:12:28.5 |
HIP 11315 |
33.63 |
| 2026-03-27 12:00 |
02:26:11.44 |
+21:13:19.0 |
HIP 11315 |
33.15 |
| 2026-03-28 00:00 |
02:26:19.27 |
+21:14:09.8 |
HIP 11315 |
32.79 |
| 2026-03-28 12:00 |
02:26:27.12 |
+21:15:00.8 |
HIP 11315 |
32.55 |
| 2026-03-29 00:00 |
02:26:35.01 |
+21:15:52.0 |
HIP 11315 |
32.44 |
| 2026-03-29 12:00 |
02:26:42.93 |
+21:16:43.4 |
HIP 11559 |
31.22 |
| 2026-03-30 00:00 |
02:26:50.87 |
+21:17:35.0 |
HIP 11559 |
29.56 |
| 2026-03-30 12:00 |
02:26:58.85 |
+21:18:26.8 |
HIP 11559 |
27.95 |
| 2026-03-31 00:00 |
02:27:06.86 |
+21:19:18.8 |
HIP 11559 |
26.40 |
| 2026-03-31 12:00 |
02:27:14.89 |
+21:20:11.0 |
HIP 11559 |
24.91 |
| 2026-04-01 00:00 |
02:27:22.96 |
+21:21:03.5 |
HIP 11559 |
23.51 |
| 2026-04-01 12:00 |
02:27:31.05 |
+21:21:56.1 |
HIP 11559 |
22.21 |
| 2026-04-02 00:00 |
02:27:39.17 |
+21:22:48.9 |
HIP 11559 |
21.03 |
| 2026-04-02 12:00 |
02:27:47.31 |
+21:23:41.8 |
HIP 11559 |
19.99 |
| 2026-04-03 00:00 |
02:27:55.48 |
+21:24:35.0 |
HIP 11559 |
19.13 |
| 2026-04-03 12:00 |
02:28:03.68 |
+21:25:28.4 |
HIP 11559 |
18.47 |
| 2026-04-04 00:00 |
02:28:11.91 |
+21:26:21.9 |
HIP 11584 |
17.84 |
| 2026-04-04 12:00 |
02:28:20.16 |
+21:27:15.7 |
HIP 11584 |
15.74 |
| 2026-04-05 00:00 |
02:28:28.43 |
+21:28:09.6 |
HIP 11584 |
13.63 |
| 2026-04-05 12:00 |
02:28:36.73 |
+21:29:03.7 |
HIP 11584 |
11.53 |
| 2026-04-06 00:00 |
02:28:45.05 |
+21:29:57.9 |
HIP 11584 |
9.43 |
| 2026-04-06 12:00 |
02:28:53.40 |
+21:30:52.4 |
HIP 11584 |
7.34 |
| 2026-04-07 00:00 |
02:29:01.76 |
+21:31:47.0 |
HIP 11584 |
5.30 |
| 2026-04-07 12:00 |
02:29:10.16 |
+21:32:41.8 |
HIP 11584 |
3.39 |
| 2026-04-08 00:00 |
02:29:18.57 |
+21:33:36.8 |
HIP 11584 |
2.04 |
| 2026-04-08 12:00 |
02:29:27.00 |
+21:34:31.9 |
HIP 11584 |
2.48 |
| 2026-04-09 00:00 |
02:29:35.46 |
+21:35:27.2 |
HIP 11584 |
4.19 |
| 2026-04-09 12:00 |
02:29:43.94 |
+21:36:22.7 |
HIP 11584 |
6.20 |
| 2026-04-10 00:00 |
02:29:52.43 |
+21:37:18.3 |
HIP 11584 |
8.30 |
| 2026-04-10 12:00 |
02:30:00.95 |
+21:38:14.1 |
HIP 11584 |
10.44 |
| 2026-04-11 00:00 |
02:30:09.49 |
+21:39:10.1 |
HIP 11584 |
12.60 |
| 2026-04-11 12:00 |
02:30:18.04 |
+21:40:06.2 |
HIP 11584 |
14.77 |
| 2026-04-12 00:00 |
02:30:26.61 |
+21:41:02.4 |
HIP 11584 |
16.96 |
| 2026-04-12 12:00 |
02:30:35.20 |
+21:41:58.9 |
HIP 11584 |
19.15 |
| 2026-04-13 00:00 |
02:30:43.81 |
+21:42:55.4 |
HIP 11584 |
21.35 |
| 2026-04-13 12:00 |
02:30:52.44 |
+21:43:52.1 |
HIP 11728 |
22.60 |
| 2026-04-14 00:00 |
02:31:01.08 |
+21:44:49.0 |
HIP 11728 |
21.11 |
| 2026-04-14 12:00 |
02:31:09.74 |
+21:45:46.0 |
HIP 11728 |
19.75 |
| 2026-04-15 00:00 |
02:31:18.41 |
+21:46:43.2 |
HIP 11797 |
18.52 |
| 2026-04-15 12:00 |
02:31:27.10 |
+21:47:40.4 |
HIP 11797 |
16.48 |
| 2026-04-16 00:00 |
02:31:35.80 |
+21:48:37.9 |
HIP 11797 |
14.49 |