| Parameter |
Value |
| Designation |
P/2020 WJ5 (Lemmon) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-01T10:23:55.633920Z |
| Orbit solution date (soln_date, UTC) |
2024-08-11T00:12:20Z |
| Obs used |
720 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-12-17.0000000 |
| e |
0.17132992 |
| q (au) |
4.985837 |
| a (au) |
6.016673 |
| i (deg) |
22.294439 |
| Ω (om, deg) |
177.810718 |
| ω (w, deg) |
338.229837 |
| M (ma, deg) |
35.633474 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.028 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.028 |
| n |
6.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
19:28:30.76 |
+01:37:12.4 |
HIP 95793 |
21.21 |
| 2026-07-29 12:00 |
19:28:18.98 |
+01:35:58.5 |
HIP 95793 |
23.53 |
| 2026-07-30 00:00 |
19:28:07.25 |
+01:34:43.8 |
HIP 95793 |
26.03 |
| 2026-07-30 12:00 |
19:27:55.57 |
+01:33:28.2 |
HIP 95793 |
28.68 |
| 2026-07-31 00:00 |
19:27:43.96 |
+01:32:11.8 |
HIP 95793 |
31.42 |
| 2026-07-31 12:00 |
19:27:32.40 |
+01:30:54.6 |
HIP 95793 |
34.24 |
| 2026-08-01 00:00 |
19:27:20.90 |
+01:29:36.6 |
HIP 95793 |
37.11 |
| 2026-08-01 12:00 |
19:27:09.46 |
+01:28:17.8 |
HIP 95451 |
38.95 |
| 2026-08-02 00:00 |
19:26:58.09 |
+01:26:58.3 |
HIP 95451 |
37.42 |
| 2026-08-02 12:00 |
19:26:46.78 |
+01:25:37.9 |
HIP 95451 |
36.12 |
| 2026-08-03 00:00 |
19:26:35.53 |
+01:24:16.8 |
HIP 95451 |
35.07 |
| 2026-08-03 12:00 |
19:26:24.36 |
+01:22:54.9 |
HIP 95451 |
34.30 |
| 2026-08-04 00:00 |
19:26:13.25 |
+01:21:32.2 |
HIP 95451 |
33.81 |
| 2026-08-04 12:00 |
19:26:02.21 |
+01:20:08.8 |
HIP 95451 |
33.63 |
| 2026-08-05 00:00 |
19:25:51.25 |
+01:18:44.7 |
HIP 95451 |
33.74 |
| 2026-08-05 12:00 |
19:25:40.35 |
+01:17:19.9 |
HIP 95451 |
34.15 |
| 2026-08-06 00:00 |
19:25:29.54 |
+01:15:54.3 |
HIP 95451 |
34.85 |
| 2026-08-06 12:00 |
19:25:18.80 |
+01:14:28.0 |
HIP 95451 |
35.80 |
| 2026-08-07 00:00 |
19:25:08.14 |
+01:13:01.1 |
HIP 95451 |
37.00 |
| 2026-08-07 12:00 |
19:24:57.56 |
+01:11:33.4 |
HIP 95451 |
38.41 |
| 2026-08-08 00:00 |
19:24:47.06 |
+01:10:05.1 |
HIP 95451 |
40.00 |
| 2026-08-08 12:00 |
19:24:36.65 |
+01:08:36.0 |
HIP 95443 |
41.70 |
| 2026-08-09 00:00 |
19:24:26.32 |
+01:07:06.4 |
HIP 95443 |
43.52 |
| 2026-08-09 12:00 |
19:24:16.07 |
+01:05:36.1 |
HIP 95443 |
45.46 |
| 2026-08-10 00:00 |
19:24:05.92 |
+01:04:05.1 |
HIP 95443 |
47.52 |
| 2026-08-10 12:00 |
19:23:55.85 |
+01:02:33.5 |
HIP 95112 |
45.53 |
| 2026-08-11 00:00 |
19:23:45.88 |
+01:01:01.3 |
HIP 95112 |
42.83 |
| 2026-08-11 12:00 |
19:23:35.99 |
+00:59:28.5 |
HIP 95112 |
40.18 |
| 2026-08-12 00:00 |
19:23:26.20 |
+00:57:55.1 |
HIP 95112 |
37.59 |
| 2026-08-12 12:00 |
19:23:16.51 |
+00:56:21.1 |
HIP 95112 |
35.08 |
| 2026-08-13 00:00 |
19:23:06.92 |
+00:54:46.5 |
HIP 95112 |
32.65 |
| 2026-08-13 12:00 |
19:22:57.42 |
+00:53:11.4 |
HIP 95112 |
30.33 |
| 2026-08-14 00:00 |
19:22:48.02 |
+00:51:35.7 |
HIP 95112 |
28.12 |
| 2026-08-14 12:00 |
19:22:38.72 |
+00:49:59.4 |
HIP 95112 |
26.07 |
| 2026-08-15 00:00 |
19:22:29.53 |
+00:48:22.7 |
HIP 95112 |
24.20 |
| 2026-08-15 12:00 |
19:22:20.44 |
+00:46:45.4 |
HIP 95112 |
22.56 |
| 2026-08-16 00:00 |
19:22:11.46 |
+00:45:07.7 |
HIP 95155 |
20.52 |
| 2026-08-16 12:00 |
19:22:02.58 |
+00:43:29.4 |
HIP 95155 |
18.13 |
| 2026-08-17 00:00 |
19:21:53.81 |
+00:41:50.6 |
HIP 95155 |
15.86 |
| 2026-08-17 12:00 |
19:21:45.15 |
+00:40:11.4 |
HIP 95155 |
13.76 |
| 2026-08-18 00:00 |
19:21:36.60 |
+00:38:31.7 |
HIP 95155 |
11.91 |
| 2026-08-18 12:00 |
19:21:28.16 |
+00:36:51.6 |
HIP 95155 |
10.43 |
| 2026-08-19 00:00 |
19:21:19.83 |
+00:35:11.1 |
HIP 95155 |
9.47 |