| Parameter |
Value |
| Designation |
C/2020 H2 (Pruyne) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-04-27T14:08:36.116160Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:14Z |
| Obs used |
121 |
| NEO |
- |
| M1 |
18.900 |
| K1 |
22.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-05-25.0000000 |
| e |
0.99553868 |
| q (au) |
0.833616 |
| a (au) |
186.853978 |
| i (deg) |
125.044340 |
| Ω (om, deg) |
277.635070 |
| ω (w, deg) |
26.692025 |
| M (ma, deg) |
0.010577 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.971 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.971 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.893 |
| 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) |
| 2026-03-26 00:00 |
06:14:02.28 |
+21:46:41.6 |
HIP 29416 |
30.85 |
| 2026-03-26 12:00 |
06:14:02.24 |
+21:46:38.3 |
HIP 29416 |
30.85 |
| 2026-03-27 00:00 |
06:14:02.25 |
+21:46:35.0 |
HIP 29416 |
30.86 |
| 2026-03-27 12:00 |
06:14:02.33 |
+21:46:31.7 |
HIP 29416 |
30.89 |
| 2026-03-28 00:00 |
06:14:02.48 |
+21:46:28.3 |
HIP 29416 |
30.93 |
| 2026-03-28 12:00 |
06:14:02.68 |
+21:46:25.0 |
HIP 29416 |
30.99 |
| 2026-03-29 00:00 |
06:14:02.95 |
+21:46:21.6 |
HIP 29416 |
31.06 |
| 2026-03-29 12:00 |
06:14:03.28 |
+21:46:18.2 |
HIP 29416 |
31.15 |
| 2026-03-30 00:00 |
06:14:03.67 |
+21:46:14.8 |
HIP 29416 |
31.25 |
| 2026-03-30 12:00 |
06:14:04.13 |
+21:46:11.4 |
HIP 29416 |
31.36 |
| 2026-03-31 00:00 |
06:14:04.64 |
+21:46:07.9 |
HIP 29416 |
31.49 |
| 2026-03-31 12:00 |
06:14:05.22 |
+21:46:04.4 |
HIP 29416 |
31.63 |
| 2026-04-01 00:00 |
06:14:05.86 |
+21:46:00.9 |
HIP 29416 |
31.79 |
| 2026-04-01 12:00 |
06:14:06.55 |
+21:45:57.4 |
HIP 29416 |
31.96 |
| 2026-04-02 00:00 |
06:14:07.31 |
+21:45:53.9 |
HIP 29416 |
32.14 |
| 2026-04-02 12:00 |
06:14:08.13 |
+21:45:50.3 |
HIP 29416 |
32.34 |
| 2026-04-03 00:00 |
06:14:09.01 |
+21:45:46.8 |
HIP 29416 |
32.55 |
| 2026-04-03 12:00 |
06:14:09.95 |
+21:45:43.2 |
HIP 29416 |
32.78 |
| 2026-04-04 00:00 |
06:14:10.95 |
+21:45:39.6 |
HIP 29416 |
33.02 |
| 2026-04-04 12:00 |
06:14:12.00 |
+21:45:35.9 |
HIP 29416 |
33.27 |
| 2026-04-05 00:00 |
06:14:13.12 |
+21:45:32.3 |
HIP 29416 |
33.54 |
| 2026-04-05 12:00 |
06:14:14.30 |
+21:45:28.6 |
HIP 29416 |
33.82 |
| 2026-04-06 00:00 |
06:14:15.53 |
+21:45:24.9 |
HIP 29416 |
34.11 |
| 2026-04-06 12:00 |
06:14:16.83 |
+21:45:21.2 |
HIP 29416 |
34.42 |
| 2026-04-07 00:00 |
06:14:18.18 |
+21:45:17.4 |
HIP 29416 |
34.74 |
| 2026-04-07 12:00 |
06:14:19.59 |
+21:45:13.7 |
HIP 29416 |
35.07 |
| 2026-04-08 00:00 |
06:14:21.06 |
+21:45:09.9 |
HIP 29689 |
35.06 |
| 2026-04-08 12:00 |
06:14:22.59 |
+21:45:06.1 |
HIP 29689 |
34.99 |
| 2026-04-09 00:00 |
06:14:24.17 |
+21:45:02.3 |
HIP 29689 |
34.92 |
| 2026-04-09 12:00 |
06:14:25.81 |
+21:44:58.4 |
HIP 29689 |
34.85 |
| 2026-04-10 00:00 |
06:14:27.51 |
+21:44:54.5 |
HIP 29689 |
34.78 |
| 2026-04-10 12:00 |
06:14:29.27 |
+21:44:50.6 |
HIP 29689 |
34.70 |
| 2026-04-11 00:00 |
06:14:31.08 |
+21:44:46.7 |
HIP 29689 |
34.63 |
| 2026-04-11 12:00 |
06:14:32.95 |
+21:44:42.8 |
HIP 29689 |
34.56 |
| 2026-04-12 00:00 |
06:14:34.87 |
+21:44:38.8 |
HIP 29689 |
34.50 |
| 2026-04-12 12:00 |
06:14:36.85 |
+21:44:34.8 |
HIP 29689 |
34.43 |
| 2026-04-13 00:00 |
06:14:38.89 |
+21:44:30.8 |
HIP 29689 |
34.37 |
| 2026-04-13 12:00 |
06:14:40.98 |
+21:44:26.7 |
HIP 29689 |
34.31 |
| 2026-04-14 00:00 |
06:14:43.13 |
+21:44:22.7 |
HIP 29689 |
34.26 |
| 2026-04-14 12:00 |
06:14:45.33 |
+21:44:18.6 |
HIP 29689 |
34.21 |
| 2026-04-15 00:00 |
06:14:47.59 |
+21:44:14.4 |
HIP 29689 |
34.17 |
| 2026-04-15 12:00 |
06:14:49.90 |
+21:44:10.3 |
HIP 29689 |
34.13 |
| 2026-04-16 00:00 |
06:14:52.26 |
+21:44:06.1 |
HIP 29689 |
34.10 |