C/2020 H2 (Pruyne)
| 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) |
| 2026-02-03 00:00 |
06:19:44.90 |
+21:50:57.2 |
HIP 30075 |
15.69 |
| 2026-02-03 12:00 |
06:19:38.50 |
+21:50:55.4 |
HIP 30075 |
15.80 |
| 2026-02-04 00:00 |
06:19:32.16 |
+21:50:53.6 |
HIP 30075 |
16.04 |
| 2026-02-04 12:00 |
06:19:25.86 |
+21:50:51.8 |
HIP 30075 |
16.41 |
| 2026-02-05 00:00 |
06:19:19.62 |
+21:50:49.9 |
HIP 30075 |
16.89 |
| 2026-02-05 12:00 |
06:19:13.43 |
+21:50:48.1 |
HIP 30075 |
17.48 |
| 2026-02-06 00:00 |
06:19:07.29 |
+21:50:46.2 |
HIP 30075 |
18.15 |
| 2026-02-06 12:00 |
06:19:01.20 |
+21:50:44.3 |
HIP 30075 |
18.90 |
| 2026-02-07 00:00 |
06:18:55.17 |
+21:50:42.5 |
HIP 30075 |
19.72 |
| 2026-02-07 12:00 |
06:18:49.19 |
+21:50:40.5 |
HIP 30075 |
20.59 |
| 2026-02-08 00:00 |
06:18:43.26 |
+21:50:38.6 |
HIP 30075 |
21.51 |
| 2026-02-08 12:00 |
06:18:37.39 |
+21:50:36.7 |
HIP 30075 |
22.46 |
| 2026-02-09 00:00 |
06:18:31.57 |
+21:50:34.7 |
HIP 30075 |
23.45 |
| 2026-02-09 12:00 |
06:18:25.81 |
+21:50:32.8 |
HIP 29867 |
23.61 |
| 2026-02-10 00:00 |
06:18:20.10 |
+21:50:30.8 |
HIP 29867 |
22.81 |
| 2026-02-10 12:00 |
06:18:14.45 |
+21:50:28.8 |
HIP 29867 |
22.07 |
| 2026-02-11 00:00 |
06:18:08.85 |
+21:50:26.8 |
HIP 29867 |
21.39 |
| 2026-02-11 12:00 |
06:18:03.32 |
+21:50:24.8 |
HIP 29867 |
20.77 |
| 2026-02-12 00:00 |
06:17:57.83 |
+21:50:22.7 |
HIP 29867 |
20.22 |
| 2026-02-12 12:00 |
06:17:52.41 |
+21:50:20.7 |
HIP 29867 |
19.75 |
| 2026-02-13 00:00 |
06:17:47.04 |
+21:50:18.6 |
HIP 29867 |
19.34 |
| 2026-02-13 12:00 |
06:17:41.73 |
+21:50:16.6 |
HIP 29867 |
19.02 |
| 2026-02-14 00:00 |
06:17:36.48 |
+21:50:14.5 |
HIP 29867 |
18.77 |
| 2026-02-14 12:00 |
06:17:31.29 |
+21:50:12.4 |
HIP 29867 |
18.61 |
| 2026-02-15 00:00 |
06:17:26.16 |
+21:50:10.2 |
HIP 29867 |
18.52 |
| 2026-02-15 12:00 |
06:17:21.09 |
+21:50:08.1 |
HIP 29867 |
18.50 |
| 2026-02-16 00:00 |
06:17:16.07 |
+21:50:06.0 |
HIP 29867 |
18.57 |
| 2026-02-16 12:00 |
06:17:11.12 |
+21:50:03.8 |
HIP 29867 |
18.70 |
| 2026-02-17 00:00 |
06:17:06.23 |
+21:50:01.6 |
HIP 29867 |
18.90 |
| 2026-02-17 12:00 |
06:17:01.40 |
+21:49:59.4 |
HIP 29867 |
19.16 |
| 2026-02-18 00:00 |
06:16:56.63 |
+21:49:57.2 |
HIP 29867 |
19.48 |
| 2026-02-18 12:00 |
06:16:51.92 |
+21:49:55.0 |
HIP 29867 |
19.85 |
| 2026-02-19 00:00 |
06:16:47.27 |
+21:49:52.8 |
HIP 29867 |
20.27 |
| 2026-02-19 12:00 |
06:16:42.68 |
+21:49:50.6 |
HIP 29827 |
20.51 |
| 2026-02-20 00:00 |
06:16:38.16 |
+21:49:48.3 |
HIP 29827 |
20.69 |
| 2026-02-20 12:00 |
06:16:33.70 |
+21:49:46.0 |
HIP 29827 |
20.92 |
| 2026-02-21 00:00 |
06:16:29.30 |
+21:49:43.8 |
HIP 29827 |
21.19 |
| 2026-02-21 12:00 |
06:16:24.96 |
+21:49:41.5 |
HIP 29827 |
21.50 |
| 2026-02-22 00:00 |
06:16:20.69 |
+21:49:39.1 |
HIP 29827 |
21.84 |
| 2026-02-22 12:00 |
06:16:16.48 |
+21:49:36.8 |
HIP 29827 |
22.23 |
| 2026-02-23 00:00 |
06:16:12.33 |
+21:49:34.5 |
HIP 29827 |
22.64 |
| 2026-02-23 12:00 |
06:16:08.25 |
+21:49:32.1 |
HIP 29827 |
23.08 |
| 2026-02-24 00:00 |
06:16:04.23 |
+21:49:29.7 |
HIP 29827 |
23.54 |