| Parameter |
Value |
| Designation |
C/2019 L3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-01-09T15:10:58.644480Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:12:44Z |
| Obs used |
6499 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
8.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-10T13:29:16.886400Z |
| Discovery magnitude (MPC) |
18.18 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-10-10.0000000 |
| e |
1.00140528 |
| q (au) |
3.554493 |
| a (au) |
-2529.392057 |
| i (deg) |
48.363747 |
| Ω (om, deg) |
290.788887 |
| ω (w, deg) |
171.613705 |
| M (ma, deg) |
-0.000710 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.726 + 4.845\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.726 |
| n |
4.845 |
| gf |
0.999 |
| 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 |
| 2019-06-10 |
2021-01-28 |
+0.5076 |
-0.218 |
| 2021-01-28 |
2022-01-09 |
+4.9638 |
-3.456 |
| 2022-01-09 |
2022-10-05 |
-9.9787 |
+4.854 |
| 2022-10-05 |
2025-05-29 |
+1.8997 |
-2.463 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
12:56:35.52 |
-61:10:46.2 |
HIP 63167 |
9.35 |
| 2026-05-12 12:00 |
12:56:24.44 |
-61:09:16.7 |
HIP 63167 |
10.89 |
| 2026-05-13 00:00 |
12:56:13.48 |
-61:07:46.4 |
HIP 63167 |
12.56 |
| 2026-05-13 12:00 |
12:56:02.64 |
-61:06:15.5 |
HIP 62982 |
12.76 |
| 2026-05-14 00:00 |
12:55:51.93 |
-61:04:43.9 |
HIP 62982 |
11.36 |
| 2026-05-14 12:00 |
12:55:41.33 |
-61:03:11.7 |
HIP 62982 |
10.18 |
| 2026-05-15 00:00 |
12:55:30.86 |
-61:01:38.8 |
HIP 62982 |
9.31 |
| 2026-05-15 12:00 |
12:55:20.52 |
-61:00:05.3 |
HIP 62982 |
8.82 |
| 2026-05-16 00:00 |
12:55:10.30 |
-60:58:31.1 |
HIP 62982 |
8.79 |
| 2026-05-16 12:00 |
12:55:00.21 |
-60:56:56.4 |
HIP 62982 |
9.22 |
| 2026-05-17 00:00 |
12:54:50.24 |
-60:55:21.0 |
HIP 62982 |
10.05 |
| 2026-05-17 12:00 |
12:54:40.41 |
-60:53:45.1 |
HIP 62871 |
11.17 |
| 2026-05-18 00:00 |
12:54:30.70 |
-60:52:08.6 |
HIP 62871 |
9.99 |
| 2026-05-18 12:00 |
12:54:21.13 |
-60:50:31.5 |
HIP 62871 |
9.11 |
| 2026-05-19 00:00 |
12:54:11.69 |
-60:48:53.8 |
HIP 62871 |
8.63 |
| 2026-05-19 12:00 |
12:54:02.38 |
-60:47:15.7 |
HIP 62871 |
8.61 |
| 2026-05-20 00:00 |
12:53:53.20 |
-60:45:37.0 |
HIP 62871 |
9.06 |
| 2026-05-20 12:00 |
12:53:44.16 |
-60:43:57.7 |
HIP 62871 |
9.91 |
| 2026-05-21 00:00 |
12:53:35.25 |
-60:42:18.0 |
HIP 62871 |
11.07 |
| 2026-05-21 12:00 |
12:53:26.48 |
-60:40:37.8 |
HIP 62871 |
12.45 |
| 2026-05-22 00:00 |
12:53:17.84 |
-60:38:57.1 |
HIP 62871 |
13.98 |
| 2026-05-22 12:00 |
12:53:09.34 |
-60:37:15.9 |
HIP 62949 |
13.65 |
| 2026-05-23 00:00 |
12:53:00.98 |
-60:35:34.3 |
HIP 62949 |
12.69 |
| 2026-05-23 12:00 |
12:52:52.75 |
-60:33:52.2 |
HIP 62949 |
11.95 |
| 2026-05-24 00:00 |
12:52:44.66 |
-60:32:09.7 |
HIP 62949 |
11.51 |
| 2026-05-24 12:00 |
12:52:36.71 |
-60:30:26.8 |
HIP 62949 |
11.37 |
| 2026-05-25 00:00 |
12:52:28.90 |
-60:28:43.5 |
HIP 62894 |
11.14 |
| 2026-05-25 12:00 |
12:52:21.23 |
-60:26:59.7 |
HIP 62894 |
10.45 |
| 2026-05-26 00:00 |
12:52:13.70 |
-60:25:15.6 |
HIP 62732 |
8.80 |
| 2026-05-26 12:00 |
12:52:06.31 |
-60:23:31.1 |
HIP 62732 |
7.04 |
| 2026-05-27 00:00 |
12:51:59.06 |
-60:21:46.2 |
HIP 62732 |
5.45 |
| 2026-05-27 12:00 |
12:51:51.95 |
-60:20:01.0 |
HIP 62732 |
4.21 |
| 2026-05-28 00:00 |
12:51:44.98 |
-60:18:15.4 |
HIP 62732 |
3.68 |
| 2026-05-28 12:00 |
12:51:38.15 |
-60:16:29.5 |
HIP 62732 |
4.13 |
| 2026-05-29 00:00 |
12:51:31.46 |
-60:14:43.3 |
HIP 62732 |
5.33 |
| 2026-05-29 12:00 |
12:51:24.91 |
-60:12:56.8 |
HIP 62732 |
6.89 |
| 2026-05-30 00:00 |
12:51:18.51 |
-60:11:09.9 |
HIP 62732 |
8.62 |
| 2026-05-30 12:00 |
12:51:12.25 |
-60:09:22.8 |
HIP 62732 |
10.43 |
| 2026-05-31 00:00 |
12:51:06.13 |
-60:07:35.4 |
HIP 62732 |
12.29 |
| 2026-05-31 12:00 |
12:51:00.15 |
-60:05:47.7 |
HIP 62732 |
14.17 |
| 2026-06-01 00:00 |
12:50:54.32 |
-60:03:59.8 |
HIP 62732 |
16.06 |
| 2026-06-01 12:00 |
12:50:48.63 |
-60:02:11.6 |
HIP 62732 |
17.97 |
| 2026-06-02 00:00 |
12:50:43.08 |
-60:00:23.2 |
HIP 62732 |
19.88 |