P/2019 LD2 (ATLAS)
| Parameter |
Value |
| Designation |
P/2019 LD2 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-04-09T14:31:26.221440Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:57Z |
| Obs used |
748 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-15.0000000 |
| e |
0.13369934 |
| q (au) |
4.577955 |
| a (au) |
5.284488 |
| i (deg) |
11.566738 |
| Ω (om, deg) |
179.670107 |
| ω (w, deg) |
123.437181 |
| M (ma, deg) |
12.851114 |
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 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
07:42:33.28 |
+09:11:12.8 |
HIP 37408 |
25.56 |
| 2026-02-03 12:00 |
07:42:19.71 |
+09:12:25.1 |
HIP 37408 |
22.45 |
| 2026-02-04 00:00 |
07:42:06.21 |
+09:13:37.9 |
HIP 37408 |
19.51 |
| 2026-02-04 12:00 |
07:41:52.81 |
+09:14:50.9 |
HIP 37408 |
16.83 |
| 2026-02-05 00:00 |
07:41:39.49 |
+09:16:04.2 |
HIP 37408 |
14.54 |
| 2026-02-05 12:00 |
07:41:26.27 |
+09:17:17.9 |
HIP 37408 |
12.82 |
| 2026-02-06 00:00 |
07:41:13.14 |
+09:18:31.9 |
HIP 37408 |
11.93 |
| 2026-02-06 12:00 |
07:41:00.10 |
+09:19:46.1 |
HIP 37408 |
12.02 |
| 2026-02-07 00:00 |
07:40:47.17 |
+09:21:00.6 |
HIP 37408 |
13.05 |
| 2026-02-07 12:00 |
07:40:34.33 |
+09:22:15.4 |
HIP 37408 |
14.82 |
| 2026-02-08 00:00 |
07:40:21.59 |
+09:23:30.5 |
HIP 37408 |
17.09 |
| 2026-02-08 12:00 |
07:40:08.96 |
+09:24:45.8 |
HIP 37351 |
19.20 |
| 2026-02-09 00:00 |
07:39:56.44 |
+09:26:01.4 |
HIP 37351 |
20.38 |
| 2026-02-09 12:00 |
07:39:44.02 |
+09:27:17.2 |
HIP 37351 |
22.00 |
| 2026-02-10 00:00 |
07:39:31.71 |
+09:28:33.2 |
HIP 37351 |
23.96 |
| 2026-02-10 12:00 |
07:39:19.52 |
+09:29:49.5 |
HIP 37351 |
26.19 |
| 2026-02-11 00:00 |
07:39:07.44 |
+09:31:05.9 |
HIP 37351 |
28.61 |
| 2026-02-11 12:00 |
07:38:55.47 |
+09:32:22.5 |
HIP 37351 |
31.16 |
| 2026-02-12 00:00 |
07:38:43.62 |
+09:33:39.4 |
HIP 37351 |
33.81 |
| 2026-02-12 12:00 |
07:38:31.90 |
+09:34:56.4 |
HIP 37038 |
32.48 |
| 2026-02-13 00:00 |
07:38:20.29 |
+09:36:13.5 |
HIP 37038 |
30.91 |
| 2026-02-13 12:00 |
07:38:08.81 |
+09:37:30.9 |
HIP 37038 |
29.62 |
| 2026-02-14 00:00 |
07:37:57.45 |
+09:38:48.3 |
HIP 37038 |
28.63 |
| 2026-02-14 12:00 |
07:37:46.22 |
+09:40:05.9 |
HIP 37038 |
27.96 |
| 2026-02-15 00:00 |
07:37:35.12 |
+09:41:23.7 |
HIP 36970 |
26.15 |
| 2026-02-15 12:00 |
07:37:24.15 |
+09:42:41.5 |
HIP 36970 |
24.38 |
| 2026-02-16 00:00 |
07:37:13.31 |
+09:43:59.5 |
HIP 36970 |
22.89 |
| 2026-02-16 12:00 |
07:37:02.61 |
+09:45:17.6 |
HIP 36970 |
21.73 |
| 2026-02-17 00:00 |
07:36:52.04 |
+09:46:35.7 |
HIP 36970 |
20.94 |
| 2026-02-17 12:00 |
07:36:41.61 |
+09:47:53.9 |
HIP 36970 |
20.56 |
| 2026-02-18 00:00 |
07:36:31.32 |
+09:49:12.2 |
HIP 36970 |
20.60 |
| 2026-02-18 12:00 |
07:36:21.17 |
+09:50:30.6 |
HIP 36970 |
21.03 |
| 2026-02-19 00:00 |
07:36:11.16 |
+09:51:49.0 |
HIP 36900 |
21.17 |
| 2026-02-19 12:00 |
07:36:01.30 |
+09:53:07.4 |
HIP 36900 |
18.57 |
| 2026-02-20 00:00 |
07:35:51.58 |
+09:54:25.9 |
HIP 36900 |
16.04 |
| 2026-02-20 12:00 |
07:35:42.01 |
+09:55:44.4 |
HIP 36900 |
13.60 |
| 2026-02-21 00:00 |
07:35:32.59 |
+09:57:02.9 |
HIP 36900 |
11.30 |
| 2026-02-21 12:00 |
07:35:23.31 |
+09:58:21.4 |
HIP 36900 |
9.22 |
| 2026-02-22 00:00 |
07:35:14.19 |
+09:59:39.9 |
HIP 36900 |
7.48 |
| 2026-02-22 12:00 |
07:35:05.22 |
+10:00:58.3 |
HIP 36900 |
6.36 |
| 2026-02-23 00:00 |
07:34:56.40 |
+10:02:16.8 |
HIP 36900 |
6.14 |
| 2026-02-23 12:00 |
07:34:47.73 |
+10:03:35.2 |
HIP 36900 |
6.89 |
| 2026-02-24 00:00 |
07:34:39.22 |
+10:04:53.5 |
HIP 36900 |
8.31 |