| 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) |
| 2026-09-20 00:00 |
05:48:56.91 |
+35:20:12.9 |
HIP 27380 |
16.33 |
| 2026-09-20 12:00 |
05:48:57.20 |
+35:20:22.8 |
HIP 27380 |
16.48 |
| 2026-09-21 00:00 |
05:48:57.41 |
+35:20:32.7 |
HIP 27380 |
16.62 |
| 2026-09-21 12:00 |
05:48:57.56 |
+35:20:42.5 |
HIP 27380 |
16.75 |
| 2026-09-22 00:00 |
05:48:57.64 |
+35:20:52.4 |
HIP 27380 |
16.87 |
| 2026-09-22 12:00 |
05:48:57.64 |
+35:21:02.3 |
HIP 27380 |
16.99 |
| 2026-09-23 00:00 |
05:48:57.57 |
+35:21:12.1 |
HIP 27380 |
17.09 |
| 2026-09-23 12:00 |
05:48:57.43 |
+35:21:21.9 |
HIP 27380 |
17.18 |
| 2026-09-24 00:00 |
05:48:57.22 |
+35:21:31.7 |
HIP 27380 |
17.26 |
| 2026-09-24 12:00 |
05:48:56.93 |
+35:21:41.5 |
HIP 27380 |
17.33 |
| 2026-09-25 00:00 |
05:48:56.57 |
+35:21:51.2 |
HIP 27380 |
17.39 |
| 2026-09-25 12:00 |
05:48:56.14 |
+35:22:01.0 |
HIP 27380 |
17.45 |
| 2026-09-26 00:00 |
05:48:55.64 |
+35:22:10.7 |
HIP 27380 |
17.49 |
| 2026-09-26 12:00 |
05:48:55.07 |
+35:22:20.3 |
HIP 27380 |
17.53 |
| 2026-09-27 00:00 |
05:48:54.42 |
+35:22:30.0 |
HIP 27380 |
17.55 |
| 2026-09-27 12:00 |
05:48:53.70 |
+35:22:39.6 |
HIP 27380 |
17.58 |
| 2026-09-28 00:00 |
05:48:52.91 |
+35:22:49.2 |
HIP 27380 |
17.59 |
| 2026-09-28 12:00 |
05:48:52.05 |
+35:22:58.8 |
HIP 27380 |
17.59 |
| 2026-09-29 00:00 |
05:48:51.11 |
+35:23:08.3 |
HIP 27361 |
17.48 |
| 2026-09-29 12:00 |
05:48:50.11 |
+35:23:17.8 |
HIP 27361 |
17.22 |
| 2026-09-30 00:00 |
05:48:49.03 |
+35:23:27.2 |
HIP 27361 |
16.95 |
| 2026-09-30 12:00 |
05:48:47.87 |
+35:23:36.6 |
HIP 27361 |
16.67 |
| 2026-10-01 00:00 |
05:48:46.65 |
+35:23:46.0 |
HIP 27361 |
16.38 |
| 2026-10-01 12:00 |
05:48:45.35 |
+35:23:55.3 |
HIP 27361 |
16.07 |
| 2026-10-02 00:00 |
05:48:43.98 |
+35:24:04.6 |
HIP 27361 |
15.76 |
| 2026-10-02 12:00 |
05:48:42.53 |
+35:24:13.8 |
HIP 27361 |
15.43 |
| 2026-10-03 00:00 |
05:48:41.02 |
+35:24:23.0 |
HIP 27361 |
15.09 |
| 2026-10-03 12:00 |
05:48:39.43 |
+35:24:32.1 |
HIP 27361 |
14.74 |
| 2026-10-04 00:00 |
05:48:37.77 |
+35:24:41.2 |
HIP 27361 |
14.38 |
| 2026-10-04 12:00 |
05:48:36.03 |
+35:24:50.2 |
HIP 27361 |
14.01 |
| 2026-10-05 00:00 |
05:48:34.23 |
+35:24:59.2 |
HIP 27361 |
13.62 |
| 2026-10-05 12:00 |
05:48:32.35 |
+35:25:08.1 |
HIP 27361 |
13.23 |
| 2026-10-06 00:00 |
05:48:30.39 |
+35:25:16.9 |
HIP 27361 |
12.83 |
| 2026-10-06 12:00 |
05:48:28.37 |
+35:25:25.7 |
HIP 27361 |
12.42 |
| 2026-10-07 00:00 |
05:48:26.27 |
+35:25:34.5 |
HIP 27361 |
12.00 |
| 2026-10-07 12:00 |
05:48:24.10 |
+35:25:43.1 |
HIP 27361 |
11.57 |
| 2026-10-08 00:00 |
05:48:21.86 |
+35:25:51.7 |
HIP 27361 |
11.14 |
| 2026-10-08 12:00 |
05:48:19.54 |
+35:26:00.2 |
HIP 27361 |
10.70 |
| 2026-10-09 00:00 |
05:48:17.16 |
+35:26:08.7 |
HIP 27361 |
10.25 |
| 2026-10-09 12:00 |
05:48:14.70 |
+35:26:17.1 |
HIP 27361 |
9.80 |
| 2026-10-10 00:00 |
05:48:12.16 |
+35:26:25.4 |
HIP 27361 |
9.35 |
| 2026-10-10 12:00 |
05:48:09.56 |
+35:26:33.6 |
HIP 27361 |
8.90 |
| 2026-10-11 00:00 |
05:48:06.89 |
+35:26:41.8 |
HIP 27361 |
8.46 |