| Parameter |
Value |
| Designation |
C/2019 M3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-01-03T01:14:33.895680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:57Z |
| Obs used |
340 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
6.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-06-30T12:24:39.600000Z |
| Discovery magnitude (MPC) |
19.39 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-04.0000000 |
| e |
1.00221470 |
| q (au) |
2.417809 |
| a (au) |
-1091.709033 |
| i (deg) |
99.436295 |
| Ω (om, deg) |
154.896272 |
| ω (w, deg) |
87.935053 |
| M (ma, deg) |
0.005819 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.222 + 2.205\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.222 |
| n |
2.205 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-06-30 |
2019-09-05 |
+4.9840 |
-2.533 |
| 2019-09-05 |
2020-11-22 |
-48.4696 |
+27.440 |
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 |
23:30:03.44 |
-51:45:40.3 |
HIP 116071 |
10.95 |
| 2026-03-26 12:00 |
23:30:12.65 |
-51:45:42.8 |
HIP 116071 |
9.66 |
| 2026-03-27 00:00 |
23:30:21.85 |
-51:45:45.9 |
HIP 116071 |
8.43 |
| 2026-03-27 12:00 |
23:30:31.03 |
-51:45:49.6 |
HIP 116071 |
7.27 |
| 2026-03-28 00:00 |
23:30:40.19 |
-51:45:53.8 |
HIP 116071 |
6.24 |
| 2026-03-28 12:00 |
23:30:49.34 |
-51:45:58.7 |
HIP 116071 |
5.39 |
| 2026-03-29 00:00 |
23:30:58.46 |
-51:46:04.1 |
HIP 116071 |
4.83 |
| 2026-03-29 12:00 |
23:31:07.57 |
-51:46:10.1 |
HIP 116071 |
4.66 |
| 2026-03-30 00:00 |
23:31:16.65 |
-51:46:16.6 |
HIP 116071 |
4.92 |
| 2026-03-30 12:00 |
23:31:25.72 |
-51:46:23.8 |
HIP 116071 |
5.54 |
| 2026-03-31 00:00 |
23:31:34.76 |
-51:46:31.5 |
HIP 116071 |
6.42 |
| 2026-03-31 12:00 |
23:31:43.78 |
-51:46:39.8 |
HIP 116071 |
7.47 |
| 2026-04-01 00:00 |
23:31:52.78 |
-51:46:48.7 |
HIP 116071 |
8.62 |
| 2026-04-01 12:00 |
23:32:01.76 |
-51:46:58.1 |
HIP 116071 |
9.84 |
| 2026-04-02 00:00 |
23:32:10.72 |
-51:47:08.2 |
HIP 116071 |
11.11 |
| 2026-04-02 12:00 |
23:32:19.65 |
-51:47:18.8 |
HIP 116071 |
12.40 |
| 2026-04-03 00:00 |
23:32:28.56 |
-51:47:30.0 |
HIP 116289 |
11.79 |
| 2026-04-03 12:00 |
23:32:37.44 |
-51:47:41.8 |
HIP 116289 |
10.57 |
| 2026-04-04 00:00 |
23:32:46.30 |
-51:47:54.2 |
HIP 116289 |
9.41 |
| 2026-04-04 12:00 |
23:32:55.13 |
-51:48:07.2 |
HIP 116289 |
8.33 |
| 2026-04-05 00:00 |
23:33:03.94 |
-51:48:20.7 |
HIP 116289 |
7.36 |
| 2026-04-05 12:00 |
23:33:12.73 |
-51:48:34.8 |
HIP 116289 |
6.55 |
| 2026-04-06 00:00 |
23:33:21.49 |
-51:48:49.6 |
HIP 116289 |
5.96 |
| 2026-04-06 12:00 |
23:33:30.22 |
-51:49:04.8 |
HIP 116289 |
5.66 |
| 2026-04-07 00:00 |
23:33:38.92 |
-51:49:20.7 |
HIP 116289 |
5.71 |
| 2026-04-07 12:00 |
23:33:47.59 |
-51:49:37.2 |
HIP 116289 |
6.07 |
| 2026-04-08 00:00 |
23:33:56.24 |
-51:49:54.2 |
HIP 116289 |
6.71 |
| 2026-04-08 12:00 |
23:34:04.86 |
-51:50:11.9 |
HIP 116289 |
7.56 |
| 2026-04-09 00:00 |
23:34:13.45 |
-51:50:30.1 |
HIP 116289 |
8.54 |
| 2026-04-09 12:00 |
23:34:22.01 |
-51:50:48.9 |
HIP 116289 |
9.62 |
| 2026-04-10 00:00 |
23:34:30.54 |
-51:51:08.3 |
HIP 116289 |
10.77 |
| 2026-04-10 12:00 |
23:34:39.04 |
-51:51:28.3 |
HIP 116289 |
11.96 |
| 2026-04-11 00:00 |
23:34:47.51 |
-51:51:48.9 |
HIP 116289 |
13.19 |
| 2026-04-11 12:00 |
23:34:55.94 |
-51:52:10.0 |
HIP 116289 |
14.44 |
| 2026-04-12 00:00 |
23:35:04.35 |
-51:52:31.8 |
HIP 116289 |
15.71 |
| 2026-04-12 12:00 |
23:35:12.72 |
-51:52:54.1 |
HIP 116289 |
16.99 |
| 2026-04-13 00:00 |
23:35:21.06 |
-51:53:17.0 |
HIP 116289 |
18.28 |
| 2026-04-13 12:00 |
23:35:29.36 |
-51:53:40.5 |
HIP 116289 |
19.58 |
| 2026-04-14 00:00 |
23:35:37.63 |
-51:54:04.6 |
HIP 116573 |
19.27 |
| 2026-04-14 12:00 |
23:35:45.87 |
-51:54:29.3 |
HIP 116573 |
18.43 |
| 2026-04-15 00:00 |
23:35:54.07 |
-51:54:54.5 |
HIP 116573 |
17.66 |
| 2026-04-15 12:00 |
23:36:02.24 |
-51:55:20.4 |
HIP 116573 |
16.97 |
| 2026-04-16 00:00 |
23:36:10.37 |
-51:55:46.8 |
HIP 116573 |
16.38 |