| 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 · University of Arizona 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) |
| 2026-06-01 00:00 |
02:44:53.07 |
+23:22:01.5 |
HIP 12830 |
0.93 |
| 2026-06-01 12:00 |
02:45:01.03 |
+23:23:03.2 |
HIP 12830 |
1.33 |
| 2026-06-02 00:00 |
02:45:08.96 |
+23:24:04.8 |
HIP 12830 |
3.38 |
| 2026-06-02 12:00 |
02:45:16.85 |
+23:25:06.4 |
HIP 12830 |
5.45 |
| 2026-06-03 00:00 |
02:45:24.72 |
+23:26:07.9 |
HIP 12830 |
7.52 |
| 2026-06-03 12:00 |
02:45:32.56 |
+23:27:09.4 |
HIP 12830 |
9.59 |
| 2026-06-04 00:00 |
02:45:40.36 |
+23:28:10.9 |
HIP 12830 |
11.65 |
| 2026-06-04 12:00 |
02:45:48.14 |
+23:29:12.3 |
HIP 12830 |
13.70 |
| 2026-06-05 00:00 |
02:45:55.88 |
+23:30:13.6 |
HIP 12830 |
15.75 |
| 2026-06-05 12:00 |
02:46:03.59 |
+23:31:14.9 |
HIP 12830 |
17.79 |
| 2026-06-06 00:00 |
02:46:11.27 |
+23:32:16.2 |
HIP 13035 |
19.07 |
| 2026-06-06 12:00 |
02:46:18.91 |
+23:33:17.4 |
HIP 13035 |
17.09 |
| 2026-06-07 00:00 |
02:46:26.53 |
+23:34:18.6 |
HIP 13035 |
15.13 |
| 2026-06-07 12:00 |
02:46:34.10 |
+23:35:19.6 |
HIP 13035 |
13.20 |
| 2026-06-08 00:00 |
02:46:41.65 |
+23:36:20.7 |
HIP 13035 |
11.31 |
| 2026-06-08 12:00 |
02:46:49.16 |
+23:37:21.7 |
HIP 13035 |
9.47 |
| 2026-06-09 00:00 |
02:46:56.63 |
+23:38:22.6 |
HIP 13035 |
7.73 |
| 2026-06-09 12:00 |
02:47:04.07 |
+23:39:23.4 |
HIP 13035 |
6.14 |
| 2026-06-10 00:00 |
02:47:11.47 |
+23:40:24.2 |
HIP 13035 |
4.85 |
| 2026-06-10 12:00 |
02:47:18.84 |
+23:41:24.9 |
HIP 13035 |
4.16 |
| 2026-06-11 00:00 |
02:47:26.17 |
+23:42:25.6 |
HIP 13035 |
4.33 |
| 2026-06-11 12:00 |
02:47:33.46 |
+23:43:26.2 |
HIP 13035 |
5.29 |
| 2026-06-12 00:00 |
02:47:40.72 |
+23:44:26.7 |
HIP 13035 |
6.68 |
| 2026-06-12 12:00 |
02:47:47.93 |
+23:45:27.1 |
HIP 13035 |
8.29 |
| 2026-06-13 00:00 |
02:47:55.11 |
+23:46:27.5 |
HIP 13035 |
10.02 |
| 2026-06-13 12:00 |
02:48:02.25 |
+23:47:27.8 |
HIP 13035 |
11.79 |
| 2026-06-14 00:00 |
02:48:09.35 |
+23:48:28.0 |
HIP 13035 |
13.60 |
| 2026-06-14 12:00 |
02:48:16.41 |
+23:49:28.1 |
HIP 13035 |
15.43 |
| 2026-06-15 00:00 |
02:48:23.42 |
+23:50:28.1 |
HIP 13035 |
17.26 |
| 2026-06-15 12:00 |
02:48:30.40 |
+23:51:28.1 |
HIP 13035 |
19.10 |
| 2026-06-16 00:00 |
02:48:37.33 |
+23:52:27.9 |
HIP 13035 |
20.94 |
| 2026-06-16 12:00 |
02:48:44.23 |
+23:53:27.7 |
HIP 13035 |
22.77 |
| 2026-06-17 00:00 |
02:48:51.08 |
+23:54:27.4 |
HIP 13035 |
24.61 |
| 2026-06-17 12:00 |
02:48:57.88 |
+23:55:27.0 |
HIP 13242 |
25.01 |
| 2026-06-18 00:00 |
02:49:04.65 |
+23:56:26.5 |
HIP 13242 |
24.41 |
| 2026-06-18 12:00 |
02:49:11.37 |
+23:57:25.9 |
HIP 13242 |
23.94 |
| 2026-06-19 00:00 |
02:49:18.04 |
+23:58:25.2 |
HIP 13242 |
23.61 |
| 2026-06-19 12:00 |
02:49:24.68 |
+23:59:24.4 |
HIP 13242 |
23.42 |
| 2026-06-20 00:00 |
02:49:31.26 |
+24:00:23.5 |
HIP 13242 |
23.38 |
| 2026-06-20 12:00 |
02:49:37.80 |
+24:01:22.5 |
HIP 13242 |
23.47 |
| 2026-06-21 00:00 |
02:49:44.30 |
+24:02:21.4 |
HIP 13242 |
23.71 |
| 2026-06-21 12:00 |
02:49:50.75 |
+24:03:20.2 |
HIP 13277 |
23.72 |
| 2026-06-22 00:00 |
02:49:57.15 |
+24:04:18.9 |
HIP 13277 |
23.67 |