| 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) |
| 2026-06-01 00:00 |
05:26:46.37 |
+35:10:15.6 |
HIP 25476 |
17.26 |
| 2026-06-01 12:00 |
05:26:54.90 |
+35:10:05.9 |
HIP 25476 |
17.34 |
| 2026-06-02 00:00 |
05:27:03.44 |
+35:09:56.3 |
HIP 25476 |
17.60 |
| 2026-06-02 12:00 |
05:27:11.98 |
+35:09:46.9 |
HIP 25476 |
18.02 |
| 2026-06-03 00:00 |
05:27:20.54 |
+35:09:37.7 |
HIP 25476 |
18.60 |
| 2026-06-03 12:00 |
05:27:29.10 |
+35:09:28.5 |
HIP 25599 |
18.61 |
| 2026-06-04 00:00 |
05:27:37.67 |
+35:09:19.6 |
HIP 25599 |
17.99 |
| 2026-06-04 12:00 |
05:27:46.25 |
+35:09:10.8 |
HIP 25599 |
17.51 |
| 2026-06-05 00:00 |
05:27:54.83 |
+35:09:02.1 |
HIP 25599 |
17.21 |
| 2026-06-05 12:00 |
05:28:03.42 |
+35:08:53.6 |
HIP 25599 |
17.07 |
| 2026-06-06 00:00 |
05:28:12.01 |
+35:08:45.2 |
HIP 25599 |
17.11 |
| 2026-06-06 12:00 |
05:28:20.61 |
+35:08:36.9 |
HIP 25735 |
17.10 |
| 2026-06-07 00:00 |
05:28:29.22 |
+35:08:28.8 |
HIP 25735 |
15.34 |
| 2026-06-07 12:00 |
05:28:37.83 |
+35:08:20.9 |
HIP 25735 |
13.58 |
| 2026-06-08 00:00 |
05:28:46.44 |
+35:08:13.1 |
HIP 25735 |
11.82 |
| 2026-06-08 12:00 |
05:28:55.05 |
+35:08:05.4 |
HIP 25735 |
10.06 |
| 2026-06-09 00:00 |
05:29:03.67 |
+35:07:57.9 |
HIP 25735 |
8.30 |
| 2026-06-09 12:00 |
05:29:12.29 |
+35:07:50.5 |
HIP 25735 |
6.54 |
| 2026-06-10 00:00 |
05:29:20.92 |
+35:07:43.3 |
HIP 25735 |
4.80 |
| 2026-06-10 12:00 |
05:29:29.54 |
+35:07:36.2 |
HIP 25735 |
3.08 |
| 2026-06-11 00:00 |
05:29:38.17 |
+35:07:29.2 |
HIP 25735 |
1.47 |
| 2026-06-11 12:00 |
05:29:46.79 |
+35:07:22.4 |
HIP 25735 |
1.06 |
| 2026-06-12 00:00 |
05:29:55.42 |
+35:07:15.7 |
HIP 25735 |
2.52 |
| 2026-06-12 12:00 |
05:30:04.04 |
+35:07:09.2 |
HIP 25735 |
4.22 |
| 2026-06-13 00:00 |
05:30:12.67 |
+35:07:02.8 |
HIP 25735 |
5.96 |
| 2026-06-13 12:00 |
05:30:21.29 |
+35:06:56.5 |
HIP 25735 |
7.71 |
| 2026-06-14 00:00 |
05:30:29.91 |
+35:06:50.4 |
HIP 25735 |
9.47 |
| 2026-06-14 12:00 |
05:30:38.53 |
+35:06:44.4 |
HIP 25735 |
11.23 |
| 2026-06-15 00:00 |
05:30:47.15 |
+35:06:38.5 |
HIP 25735 |
12.99 |
| 2026-06-15 12:00 |
05:30:55.76 |
+35:06:32.8 |
HIP 25735 |
14.75 |
| 2026-06-16 00:00 |
05:31:04.37 |
+35:06:27.2 |
HIP 25906 |
15.95 |
| 2026-06-16 12:00 |
05:31:12.97 |
+35:06:21.8 |
HIP 25906 |
15.01 |
| 2026-06-17 00:00 |
05:31:21.57 |
+35:06:16.5 |
HIP 25943 |
14.18 |
| 2026-06-17 12:00 |
05:31:30.16 |
+35:06:11.3 |
HIP 25943 |
12.91 |
| 2026-06-18 00:00 |
05:31:38.75 |
+35:06:06.3 |
HIP 25943 |
11.76 |
| 2026-06-18 12:00 |
05:31:47.33 |
+35:06:01.3 |
HIP 25943 |
10.79 |
| 2026-06-19 00:00 |
05:31:55.91 |
+35:05:56.6 |
HIP 25943 |
10.04 |
| 2026-06-19 12:00 |
05:32:04.47 |
+35:05:51.9 |
HIP 25943 |
9.56 |
| 2026-06-20 00:00 |
05:32:13.03 |
+35:05:47.4 |
HIP 25943 |
9.39 |
| 2026-06-20 12:00 |
05:32:21.58 |
+35:05:43.0 |
HIP 25943 |
9.54 |
| 2026-06-21 00:00 |
05:32:30.12 |
+35:05:38.8 |
HIP 25943 |
10.01 |
| 2026-06-21 12:00 |
05:32:38.65 |
+35:05:34.7 |
HIP 25943 |
10.74 |
| 2026-06-22 00:00 |
05:32:47.18 |
+35:05:30.7 |
HIP 25943 |
11.70 |