| Parameter |
Value |
| Designation |
C/2020 Q2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-02-06T10:13:35.472000Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:12:49Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-08-22T09:39:13.363200Z |
| Discovery magnitude (MPC) |
21.03 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-06.0000000 |
| e |
0.50559490 |
| q (au) |
5.399394 |
| a (au) |
10.920993 |
| i (deg) |
3.310350 |
| Ω (om, deg) |
179.948112 |
| ω (w, deg) |
118.449735 |
| M (ma, deg) |
5.805249 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.351 + 4.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.351 |
| n |
4.380 |
| gf |
1.000 |
| gb |
-0.934 |
| 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 |
04:00:13.17 |
+17:51:40.5 |
HIP 18735 |
21.68 |
| 2026-06-01 12:00 |
04:00:25.73 |
+17:52:14.6 |
HIP 18735 |
20.15 |
| 2026-06-02 00:00 |
04:00:38.27 |
+17:52:48.6 |
HIP 18735 |
19.00 |
| 2026-06-02 12:00 |
04:00:50.81 |
+17:53:22.5 |
HIP 18735 |
18.28 |
| 2026-06-03 00:00 |
04:01:03.33 |
+17:53:56.2 |
HIP 18735 |
18.05 |
| 2026-06-03 12:00 |
04:01:15.84 |
+17:54:29.8 |
HIP 18735 |
18.32 |
| 2026-06-04 00:00 |
04:01:28.34 |
+17:55:03.3 |
HIP 18849 |
16.73 |
| 2026-06-04 12:00 |
04:01:40.83 |
+17:55:36.5 |
HIP 18849 |
13.94 |
| 2026-06-05 00:00 |
04:01:53.30 |
+17:56:09.7 |
HIP 18849 |
11.28 |
| 2026-06-05 12:00 |
04:02:05.75 |
+17:56:42.6 |
HIP 18849 |
8.85 |
| 2026-06-06 00:00 |
04:02:18.19 |
+17:57:15.5 |
HIP 18849 |
6.90 |
| 2026-06-06 12:00 |
04:02:30.62 |
+17:57:48.2 |
HIP 18849 |
5.91 |
| 2026-06-07 00:00 |
04:02:43.03 |
+17:58:20.7 |
HIP 18849 |
6.36 |
| 2026-06-07 12:00 |
04:02:55.42 |
+17:58:53.0 |
HIP 18849 |
7.99 |
| 2026-06-08 00:00 |
04:03:07.80 |
+17:59:25.2 |
HIP 18849 |
10.26 |
| 2026-06-08 12:00 |
04:03:20.16 |
+17:59:57.3 |
HIP 18849 |
12.82 |
| 2026-06-09 00:00 |
04:03:32.50 |
+18:00:29.2 |
HIP 18849 |
15.53 |
| 2026-06-09 12:00 |
04:03:44.83 |
+18:01:00.9 |
HIP 18849 |
18.32 |
| 2026-06-10 00:00 |
04:03:57.13 |
+18:01:32.5 |
HIP 18849 |
21.16 |
| 2026-06-10 12:00 |
04:04:09.42 |
+18:02:03.9 |
HIP 19098 |
22.21 |
| 2026-06-11 00:00 |
04:04:21.68 |
+18:02:35.1 |
HIP 19098 |
19.57 |
| 2026-06-11 12:00 |
04:04:33.93 |
+18:03:06.1 |
HIP 19098 |
17.04 |
| 2026-06-12 00:00 |
04:04:46.15 |
+18:03:37.0 |
HIP 19098 |
14.68 |
| 2026-06-12 12:00 |
04:04:58.36 |
+18:04:07.8 |
HIP 19098 |
12.57 |
| 2026-06-13 00:00 |
04:05:10.54 |
+18:04:38.3 |
HIP 19098 |
10.85 |
| 2026-06-13 12:00 |
04:05:22.70 |
+18:05:08.7 |
HIP 19098 |
9.75 |
| 2026-06-14 00:00 |
04:05:34.83 |
+18:05:38.9 |
HIP 19098 |
9.45 |
| 2026-06-14 12:00 |
04:05:46.94 |
+18:06:09.0 |
HIP 19098 |
10.04 |
| 2026-06-15 00:00 |
04:05:59.03 |
+18:06:38.8 |
HIP 19098 |
11.36 |
| 2026-06-15 12:00 |
04:06:11.09 |
+18:07:08.5 |
HIP 19098 |
13.20 |
| 2026-06-16 00:00 |
04:06:23.13 |
+18:07:38.0 |
HIP 19098 |
15.37 |
| 2026-06-16 12:00 |
04:06:35.14 |
+18:08:07.4 |
HIP 19098 |
17.74 |
| 2026-06-17 00:00 |
04:06:47.12 |
+18:08:36.5 |
HIP 19098 |
20.25 |
| 2026-06-17 12:00 |
04:06:59.08 |
+18:09:05.5 |
HIP 19098 |
22.83 |
| 2026-06-18 00:00 |
04:07:11.01 |
+18:09:34.3 |
HIP 19098 |
25.48 |
| 2026-06-18 12:00 |
04:07:22.91 |
+18:10:02.9 |
HIP 19098 |
28.16 |
| 2026-06-19 00:00 |
04:07:34.78 |
+18:10:31.3 |
HIP 19098 |
30.87 |
| 2026-06-19 12:00 |
04:07:46.62 |
+18:10:59.5 |
HIP 19098 |
33.59 |
| 2026-06-20 00:00 |
04:07:58.43 |
+18:11:27.6 |
HIP 19470 |
35.93 |
| 2026-06-20 12:00 |
04:08:10.21 |
+18:11:55.5 |
HIP 19470 |
33.25 |
| 2026-06-21 00:00 |
04:08:21.97 |
+18:12:23.2 |
HIP 19470 |
30.62 |
| 2026-06-21 12:00 |
04:08:33.69 |
+18:12:50.7 |
HIP 19470 |
28.03 |
| 2026-06-22 00:00 |
04:08:45.37 |
+18:13:18.0 |
HIP 19470 |
25.50 |