| Parameter |
Value |
| Designation |
P/2019 LD2 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-09T09:51:48.663360Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:21Z |
| Obs used |
770 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-29.0000000 |
| e |
0.13350136 |
| q (au) |
4.577933 |
| a (au) |
5.283255 |
| i (deg) |
11.568661 |
| Ω (om, deg) |
179.662369 |
| ω (w, deg) |
123.425509 |
| M (ma, deg) |
14.007637 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.119 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.119 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.500 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:20:18.64 |
+08:00:07.3 |
HIP 45772 |
11.83 |
| 2026-09-20 12:00 |
09:20:38.82 |
+07:58:26.9 |
HIP 45772 |
15.90 |
| 2026-09-21 00:00 |
09:20:58.93 |
+07:56:46.4 |
HIP 45912 |
19.18 |
| 2026-09-21 12:00 |
09:21:18.97 |
+07:55:05.9 |
HIP 45912 |
18.51 |
| 2026-09-22 00:00 |
09:21:38.95 |
+07:53:25.4 |
HIP 45912 |
19.29 |
| 2026-09-22 12:00 |
09:21:58.86 |
+07:51:44.9 |
HIP 45912 |
21.36 |
| 2026-09-23 00:00 |
09:22:18.71 |
+07:50:04.5 |
HIP 46053 |
18.98 |
| 2026-09-23 12:00 |
09:22:38.48 |
+07:48:24.0 |
HIP 46053 |
13.82 |
| 2026-09-24 00:00 |
09:22:58.19 |
+07:46:43.6 |
HIP 46053 |
8.69 |
| 2026-09-24 12:00 |
09:23:17.82 |
+07:45:03.3 |
HIP 46053 |
3.66 |
| 2026-09-25 00:00 |
09:23:37.39 |
+07:43:22.9 |
HIP 46053 |
2.02 |
| 2026-09-25 12:00 |
09:23:56.88 |
+07:41:42.6 |
HIP 46053 |
6.87 |
| 2026-09-26 00:00 |
09:24:16.31 |
+07:40:02.4 |
HIP 46053 |
11.92 |
| 2026-09-26 12:00 |
09:24:35.66 |
+07:38:22.2 |
HIP 46053 |
16.98 |
| 2026-09-27 00:00 |
09:24:54.94 |
+07:36:42.0 |
HIP 46053 |
22.03 |
| 2026-09-27 12:00 |
09:25:14.14 |
+07:35:01.9 |
HIP 46303 |
20.65 |
| 2026-09-28 00:00 |
09:25:33.27 |
+07:33:21.9 |
HIP 46303 |
16.80 |
| 2026-09-28 12:00 |
09:25:52.33 |
+07:31:41.9 |
HIP 46303 |
13.75 |
| 2026-09-29 00:00 |
09:26:11.31 |
+07:30:02.0 |
HIP 46303 |
12.09 |
| 2026-09-29 12:00 |
09:26:30.22 |
+07:28:22.2 |
HIP 46303 |
12.37 |
| 2026-09-30 00:00 |
09:26:49.05 |
+07:26:42.5 |
HIP 46400 |
14.23 |
| 2026-09-30 12:00 |
09:27:07.80 |
+07:25:02.8 |
HIP 46400 |
9.30 |
| 2026-10-01 00:00 |
09:27:26.48 |
+07:23:23.3 |
HIP 46400 |
4.38 |
| 2026-10-01 12:00 |
09:27:45.07 |
+07:21:43.8 |
HIP 46400 |
0.55 |
| 2026-10-02 00:00 |
09:28:03.59 |
+07:20:04.5 |
HIP 46400 |
5.40 |
| 2026-10-02 12:00 |
09:28:22.02 |
+07:18:25.2 |
HIP 46400 |
10.26 |
| 2026-10-03 00:00 |
09:28:40.38 |
+07:16:46.1 |
HIP 46400 |
15.11 |
| 2026-10-03 12:00 |
09:28:58.65 |
+07:15:07.1 |
HIP 46447 |
17.07 |
| 2026-10-04 00:00 |
09:29:16.85 |
+07:13:28.2 |
HIP 46447 |
18.56 |
| 2026-10-04 12:00 |
09:29:34.95 |
+07:11:49.4 |
HIP 46447 |
21.05 |
| 2026-10-05 00:00 |
09:29:52.98 |
+07:10:10.8 |
HIP 46447 |
24.22 |
| 2026-10-05 12:00 |
09:30:10.92 |
+07:08:32.3 |
HIP 46761 |
26.55 |
| 2026-10-06 00:00 |
09:30:28.77 |
+07:06:54.0 |
HIP 46761 |
23.17 |
| 2026-10-06 12:00 |
09:30:46.54 |
+07:05:15.8 |
HIP 46761 |
20.34 |
| 2026-10-07 00:00 |
09:31:04.22 |
+07:03:37.8 |
HIP 46761 |
18.30 |
| 2026-10-07 12:00 |
09:31:21.81 |
+07:02:00.0 |
HIP 46761 |
17.33 |
| 2026-10-08 00:00 |
09:31:39.32 |
+07:00:22.3 |
HIP 46826 |
13.60 |
| 2026-10-08 12:00 |
09:31:56.73 |
+06:58:44.8 |
HIP 46826 |
10.19 |
| 2026-10-09 00:00 |
09:32:14.05 |
+06:57:07.5 |
HIP 46826 |
8.08 |
| 2026-10-09 12:00 |
09:32:31.28 |
+06:55:30.4 |
HIP 46826 |
8.30 |
| 2026-10-10 00:00 |
09:32:48.42 |
+06:53:53.5 |
HIP 46826 |
10.69 |
| 2026-10-10 12:00 |
09:33:05.47 |
+06:52:16.9 |
HIP 46826 |
14.16 |
| 2026-10-11 00:00 |
09:33:22.43 |
+06:50:40.4 |
HIP 46826 |
18.08 |