| 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) |
| 2026-06-01 00:00 |
19:49:30.01 |
+02:04:36.5 |
HIP 97418 |
36.46 |
| 2026-06-01 12:00 |
19:49:23.63 |
+02:05:21.9 |
HIP 97418 |
36.12 |
| 2026-06-02 00:00 |
19:49:17.12 |
+02:06:06.4 |
HIP 97418 |
35.83 |
| 2026-06-02 12:00 |
19:49:10.49 |
+02:06:50.0 |
HIP 97418 |
35.60 |
| 2026-06-03 00:00 |
19:49:03.74 |
+02:07:32.7 |
HIP 97418 |
35.44 |
| 2026-06-03 12:00 |
19:48:56.86 |
+02:08:14.5 |
HIP 97418 |
35.34 |
| 2026-06-04 00:00 |
19:48:49.86 |
+02:08:55.3 |
HIP 97418 |
35.31 |
| 2026-06-04 12:00 |
19:48:42.74 |
+02:09:35.2 |
HIP 97418 |
35.36 |
| 2026-06-05 00:00 |
19:48:35.50 |
+02:10:14.2 |
HIP 97418 |
35.49 |
| 2026-06-05 12:00 |
19:48:28.14 |
+02:10:52.3 |
HIP 97418 |
35.71 |
| 2026-06-06 00:00 |
19:48:20.66 |
+02:11:29.4 |
HIP 97418 |
36.00 |
| 2026-06-06 12:00 |
19:48:13.06 |
+02:12:05.5 |
HIP 97418 |
36.38 |
| 2026-06-07 00:00 |
19:48:05.35 |
+02:12:40.7 |
HIP 97418 |
36.85 |
| 2026-06-07 12:00 |
19:47:57.52 |
+02:13:14.9 |
HIP 97418 |
37.41 |
| 2026-06-08 00:00 |
19:47:49.57 |
+02:13:48.1 |
HIP 97418 |
38.05 |
| 2026-06-08 12:00 |
19:47:41.51 |
+02:14:20.4 |
HIP 97418 |
38.78 |
| 2026-06-09 00:00 |
19:47:33.34 |
+02:14:51.6 |
HIP 97418 |
39.59 |
| 2026-06-09 12:00 |
19:47:25.06 |
+02:15:21.9 |
HIP 97298 |
38.79 |
| 2026-06-10 00:00 |
19:47:16.66 |
+02:15:51.2 |
HIP 97298 |
37.61 |
| 2026-06-10 12:00 |
19:47:08.15 |
+02:16:19.5 |
HIP 97298 |
36.54 |
| 2026-06-11 00:00 |
19:46:59.54 |
+02:16:46.7 |
HIP 97298 |
35.58 |
| 2026-06-11 12:00 |
19:46:50.82 |
+02:17:12.9 |
HIP 97298 |
34.74 |
| 2026-06-12 00:00 |
19:46:41.99 |
+02:17:38.2 |
HIP 97298 |
34.04 |
| 2026-06-12 12:00 |
19:46:33.05 |
+02:18:02.3 |
HIP 97298 |
33.50 |
| 2026-06-13 00:00 |
19:46:24.01 |
+02:18:25.5 |
HIP 97121 |
31.46 |
| 2026-06-13 12:00 |
19:46:14.87 |
+02:18:47.6 |
HIP 97121 |
29.22 |
| 2026-06-14 00:00 |
19:46:05.62 |
+02:19:08.7 |
HIP 97121 |
26.96 |
| 2026-06-14 12:00 |
19:45:56.27 |
+02:19:28.7 |
HIP 97121 |
24.69 |
| 2026-06-15 00:00 |
19:45:46.83 |
+02:19:47.7 |
HIP 97121 |
22.40 |
| 2026-06-15 12:00 |
19:45:37.28 |
+02:20:05.6 |
HIP 97121 |
20.11 |
| 2026-06-16 00:00 |
19:45:27.64 |
+02:20:22.4 |
HIP 97121 |
17.83 |
| 2026-06-16 12:00 |
19:45:17.91 |
+02:20:38.2 |
HIP 97121 |
15.55 |
| 2026-06-17 00:00 |
19:45:08.08 |
+02:20:52.9 |
HIP 97121 |
13.31 |
| 2026-06-17 12:00 |
19:44:58.15 |
+02:21:06.5 |
HIP 97121 |
11.14 |
| 2026-06-18 00:00 |
19:44:48.14 |
+02:21:19.1 |
HIP 97121 |
9.11 |
| 2026-06-18 12:00 |
19:44:38.04 |
+02:21:30.6 |
HIP 97121 |
7.34 |
| 2026-06-19 00:00 |
19:44:27.85 |
+02:21:41.0 |
HIP 97121 |
6.11 |
| 2026-06-19 12:00 |
19:44:17.57 |
+02:21:50.3 |
HIP 97121 |
5.79 |
| 2026-06-20 00:00 |
19:44:07.21 |
+02:21:58.5 |
HIP 97121 |
6.55 |
| 2026-06-20 12:00 |
19:43:56.76 |
+02:22:05.7 |
HIP 97121 |
8.11 |
| 2026-06-21 00:00 |
19:43:46.24 |
+02:22:11.7 |
HIP 97121 |
10.12 |
| 2026-06-21 12:00 |
19:43:35.63 |
+02:22:16.7 |
HIP 97121 |
12.37 |
| 2026-06-22 00:00 |
19:43:24.94 |
+02:22:20.6 |
HIP 97121 |
14.76 |