| Parameter |
Value |
| Designation |
C/2020 H3 (Wierzchos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-06-03T13:35:43.509120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:05Z |
| Obs used |
131 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
27.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-06-11.0000000 |
| e |
1.00221882 |
| q (au) |
2.304388 |
| a (au) |
-1038.566850 |
| i (deg) |
62.368384 |
| Ω (om, deg) |
270.569348 |
| ω (w, deg) |
29.607609 |
| M (ma, deg) |
0.000219 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.149 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.149 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.998 |
| 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) |
| 2026-07-29 00:00 |
05:42:20.82 |
+35:06:02.6 |
HIP 26952 |
12.59 |
| 2026-07-29 12:00 |
05:42:27.39 |
+35:06:07.0 |
HIP 26952 |
11.52 |
| 2026-07-30 00:00 |
05:42:33.92 |
+35:06:11.6 |
HIP 26952 |
10.51 |
| 2026-07-30 12:00 |
05:42:40.41 |
+35:06:16.2 |
HIP 26952 |
9.59 |
| 2026-07-31 00:00 |
05:42:46.86 |
+35:06:20.8 |
HIP 26952 |
8.78 |
| 2026-07-31 12:00 |
05:42:53.26 |
+35:06:25.6 |
HIP 26952 |
8.10 |
| 2026-08-01 00:00 |
05:42:59.63 |
+35:06:30.5 |
HIP 26952 |
7.60 |
| 2026-08-01 12:00 |
05:43:05.94 |
+35:06:35.5 |
HIP 26952 |
7.29 |
| 2026-08-02 00:00 |
05:43:12.22 |
+35:06:40.5 |
HIP 26952 |
7.20 |
| 2026-08-02 12:00 |
05:43:18.45 |
+35:06:45.7 |
HIP 26952 |
7.34 |
| 2026-08-03 00:00 |
05:43:24.63 |
+35:06:50.9 |
HIP 26952 |
7.69 |
| 2026-08-03 12:00 |
05:43:30.77 |
+35:06:56.2 |
HIP 26952 |
8.21 |
| 2026-08-04 00:00 |
05:43:36.87 |
+35:07:01.6 |
HIP 26952 |
8.87 |
| 2026-08-04 12:00 |
05:43:42.91 |
+35:07:07.1 |
HIP 26952 |
9.64 |
| 2026-08-05 00:00 |
05:43:48.92 |
+35:07:12.7 |
HIP 26952 |
10.50 |
| 2026-08-05 12:00 |
05:43:54.87 |
+35:07:18.4 |
HIP 26952 |
11.41 |
| 2026-08-06 00:00 |
05:44:00.78 |
+35:07:24.1 |
HIP 26952 |
12.37 |
| 2026-08-06 12:00 |
05:44:06.64 |
+35:07:30.0 |
HIP 26952 |
13.36 |
| 2026-08-07 00:00 |
05:44:12.46 |
+35:07:35.9 |
HIP 26952 |
14.37 |
| 2026-08-07 12:00 |
05:44:18.22 |
+35:07:41.9 |
HIP 26952 |
15.40 |
| 2026-08-08 00:00 |
05:44:23.94 |
+35:07:48.0 |
HIP 26952 |
16.44 |
| 2026-08-08 12:00 |
05:44:29.61 |
+35:07:54.2 |
HIP 26952 |
17.48 |
| 2026-08-09 00:00 |
05:44:35.23 |
+35:08:00.5 |
HIP 26952 |
18.53 |
| 2026-08-09 12:00 |
05:44:40.80 |
+35:08:06.8 |
HIP 26952 |
19.59 |
| 2026-08-10 00:00 |
05:44:46.31 |
+35:08:13.2 |
HIP 26952 |
20.64 |
| 2026-08-10 12:00 |
05:44:51.78 |
+35:08:19.7 |
HIP 26952 |
21.69 |
| 2026-08-11 00:00 |
05:44:57.20 |
+35:08:26.3 |
HIP 26952 |
22.73 |
| 2026-08-11 12:00 |
05:45:02.56 |
+35:08:33.0 |
HIP 26952 |
23.77 |
| 2026-08-12 00:00 |
05:45:07.88 |
+35:08:39.7 |
HIP 26952 |
24.81 |
| 2026-08-12 12:00 |
05:45:13.14 |
+35:08:46.5 |
HIP 26952 |
25.84 |
| 2026-08-13 00:00 |
05:45:18.34 |
+35:08:53.4 |
HIP 26952 |
26.86 |
| 2026-08-13 12:00 |
05:45:23.50 |
+35:09:00.4 |
HIP 26952 |
27.87 |
| 2026-08-14 00:00 |
05:45:28.60 |
+35:09:07.4 |
HIP 27155 |
27.97 |
| 2026-08-14 12:00 |
05:45:33.65 |
+35:09:14.6 |
HIP 27155 |
27.91 |
| 2026-08-15 00:00 |
05:45:38.64 |
+35:09:21.7 |
HIP 27155 |
27.89 |
| 2026-08-15 12:00 |
05:45:43.58 |
+35:09:29.0 |
HIP 27380 |
27.13 |
| 2026-08-16 00:00 |
05:45:48.46 |
+35:09:36.3 |
HIP 27380 |
26.13 |
| 2026-08-16 12:00 |
05:45:53.29 |
+35:09:43.8 |
HIP 27380 |
25.15 |
| 2026-08-17 00:00 |
05:45:58.06 |
+35:09:51.2 |
HIP 27380 |
24.17 |
| 2026-08-17 12:00 |
05:46:02.78 |
+35:09:58.8 |
HIP 27380 |
23.21 |
| 2026-08-18 00:00 |
05:46:07.44 |
+35:10:06.4 |
HIP 27380 |
22.26 |
| 2026-08-18 12:00 |
05:46:12.04 |
+35:10:14.1 |
HIP 27380 |
21.32 |
| 2026-08-19 00:00 |
05:46:16.59 |
+35:10:21.8 |
HIP 27380 |
20.40 |