| Parameter |
Value |
| Designation |
C/2019 E3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-11-14T09:33:40.299840Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T12:42:02Z |
| Obs used |
970 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
6.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-03-05T10:14:33.792000Z |
| Discovery magnitude (MPC) |
18.45 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-08-19.0000000 |
| e |
1.00095429 |
| q (au) |
10.313386 |
| a (au) |
-10807.441446 |
| i (deg) |
84.297521 |
| Ω (om, deg) |
347.253741 |
| ω (w, deg) |
280.665701 |
| M (ma, deg) |
-0.000397 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.549 + 3.593\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.549 |
| n |
3.593 |
| gf |
0.999 |
| gb |
-0.503 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
00:38:10.96 |
-44:09:07.2 |
HIP 3037 |
9.79 |
| 2026-07-29 12:00 |
00:38:02.12 |
-44:10:16.0 |
HIP 3037 |
11.59 |
| 2026-07-30 00:00 |
00:37:53.17 |
-44:11:24.7 |
HIP 3037 |
13.43 |
| 2026-07-30 12:00 |
00:37:44.10 |
-44:12:33.3 |
HIP 2950 |
12.23 |
| 2026-07-31 00:00 |
00:37:34.92 |
-44:13:41.8 |
HIP 2950 |
10.83 |
| 2026-07-31 12:00 |
00:37:25.62 |
-44:14:50.0 |
HIP 2950 |
9.65 |
| 2026-08-01 00:00 |
00:37:16.22 |
-44:15:58.1 |
HIP 2950 |
8.78 |
| 2026-08-01 12:00 |
00:37:06.70 |
-44:17:06.1 |
HIP 2950 |
8.35 |
| 2026-08-02 00:00 |
00:36:57.07 |
-44:18:13.8 |
HIP 2950 |
8.41 |
| 2026-08-02 12:00 |
00:36:47.32 |
-44:19:21.4 |
HIP 2950 |
8.98 |
| 2026-08-03 00:00 |
00:36:37.47 |
-44:20:28.7 |
HIP 2950 |
9.97 |
| 2026-08-03 12:00 |
00:36:27.51 |
-44:21:35.8 |
HIP 2950 |
11.29 |
| 2026-08-04 00:00 |
00:36:17.43 |
-44:22:42.7 |
HIP 2950 |
12.84 |
| 2026-08-04 12:00 |
00:36:07.24 |
-44:23:49.3 |
HIP 2950 |
14.55 |
| 2026-08-05 00:00 |
00:35:56.95 |
-44:24:55.7 |
HIP 2950 |
16.38 |
| 2026-08-05 12:00 |
00:35:46.54 |
-44:26:01.8 |
HIP 2714 |
18.24 |
| 2026-08-06 00:00 |
00:35:36.03 |
-44:27:07.6 |
HIP 2714 |
16.11 |
| 2026-08-06 12:00 |
00:35:25.41 |
-44:28:13.1 |
HIP 2714 |
14.00 |
| 2026-08-07 00:00 |
00:35:14.68 |
-44:29:18.4 |
HIP 2714 |
11.90 |
| 2026-08-07 12:00 |
00:35:03.84 |
-44:30:23.3 |
HIP 2714 |
9.84 |
| 2026-08-08 00:00 |
00:34:52.90 |
-44:31:27.9 |
HIP 2714 |
7.86 |
| 2026-08-08 12:00 |
00:34:41.85 |
-44:32:32.2 |
HIP 2714 |
6.05 |
| 2026-08-09 00:00 |
00:34:30.69 |
-44:33:36.1 |
HIP 2714 |
4.64 |
| 2026-08-09 12:00 |
00:34:19.43 |
-44:34:39.6 |
HIP 2714 |
4.09 |
| 2026-08-10 00:00 |
00:34:08.06 |
-44:35:42.8 |
HIP 2714 |
4.73 |
| 2026-08-10 12:00 |
00:33:56.59 |
-44:36:45.6 |
HIP 2714 |
6.22 |
| 2026-08-11 00:00 |
00:33:45.02 |
-44:37:48.0 |
HIP 2714 |
8.11 |
| 2026-08-11 12:00 |
00:33:33.34 |
-44:38:49.9 |
HIP 2714 |
10.19 |
| 2026-08-12 00:00 |
00:33:21.56 |
-44:39:51.5 |
HIP 2714 |
12.37 |
| 2026-08-12 12:00 |
00:33:09.69 |
-44:40:52.6 |
HIP 2714 |
14.62 |
| 2026-08-13 00:00 |
00:32:57.71 |
-44:41:53.3 |
HIP 2714 |
16.90 |
| 2026-08-13 12:00 |
00:32:45.63 |
-44:42:53.5 |
HIP 2714 |
19.22 |
| 2026-08-14 00:00 |
00:32:33.45 |
-44:43:53.2 |
HIP 2714 |
21.57 |
| 2026-08-14 12:00 |
00:32:21.17 |
-44:44:52.5 |
HIP 2714 |
23.93 |
| 2026-08-15 00:00 |
00:32:08.80 |
-44:45:51.2 |
HIP 2714 |
26.31 |
| 2026-08-15 12:00 |
00:31:56.33 |
-44:46:49.4 |
HIP 2714 |
28.71 |
| 2026-08-16 00:00 |
00:31:43.76 |
-44:47:47.2 |
HIP 2714 |
31.13 |
| 2026-08-16 12:00 |
00:31:31.10 |
-44:48:44.4 |
HIP 2284 |
28.91 |
| 2026-08-17 00:00 |
00:31:18.35 |
-44:49:41.0 |
HIP 2284 |
26.49 |
| 2026-08-17 12:00 |
00:31:05.50 |
-44:50:37.1 |
HIP 2284 |
24.06 |
| 2026-08-18 00:00 |
00:30:52.57 |
-44:51:32.6 |
HIP 2284 |
21.64 |
| 2026-08-18 12:00 |
00:30:39.54 |
-44:52:27.6 |
HIP 2284 |
19.22 |
| 2026-08-19 00:00 |
00:30:26.42 |
-44:53:21.9 |
HIP 2284 |
16.81 |