| 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 |
0.998 |
| 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) |
| 2026-05-12 00:00 |
03:51:47.29 |
+17:27:10.9 |
HIP 17960 |
20.18 |
| 2026-05-12 12:00 |
03:51:59.89 |
+17:27:49.7 |
HIP 18170 |
18.62 |
| 2026-05-13 00:00 |
03:52:12.49 |
+17:28:28.4 |
HIP 18170 |
16.31 |
| 2026-05-13 12:00 |
03:52:25.11 |
+17:29:07.1 |
HIP 18170 |
14.30 |
| 2026-05-14 00:00 |
03:52:37.73 |
+17:29:45.6 |
HIP 18170 |
12.72 |
| 2026-05-14 12:00 |
03:52:50.36 |
+17:30:24.1 |
HIP 18170 |
11.74 |
| 2026-05-15 00:00 |
03:53:03.00 |
+17:31:02.4 |
HIP 18170 |
11.53 |
| 2026-05-15 12:00 |
03:53:15.64 |
+17:31:40.7 |
HIP 18170 |
12.13 |
| 2026-05-16 00:00 |
03:53:28.30 |
+17:32:18.9 |
HIP 18170 |
13.42 |
| 2026-05-16 12:00 |
03:53:40.95 |
+17:32:57.0 |
HIP 18170 |
15.23 |
| 2026-05-17 00:00 |
03:53:53.62 |
+17:33:35.0 |
HIP 18304 |
13.45 |
| 2026-05-17 12:00 |
03:54:06.28 |
+17:34:12.8 |
HIP 18304 |
10.36 |
| 2026-05-18 00:00 |
03:54:18.95 |
+17:34:50.6 |
HIP 18304 |
7.28 |
| 2026-05-18 12:00 |
03:54:31.63 |
+17:35:28.3 |
HIP 18304 |
4.19 |
| 2026-05-19 00:00 |
03:54:44.31 |
+17:36:05.9 |
HIP 18304 |
1.11 |
| 2026-05-19 12:00 |
03:54:56.98 |
+17:36:43.3 |
HIP 18304 |
1.98 |
| 2026-05-20 00:00 |
03:55:09.67 |
+17:37:20.7 |
HIP 18354 |
3.95 |
| 2026-05-20 12:00 |
03:55:22.35 |
+17:37:57.9 |
HIP 18354 |
0.88 |
| 2026-05-21 00:00 |
03:55:35.03 |
+17:38:35.0 |
HIP 18354 |
2.23 |
| 2026-05-21 12:00 |
03:55:47.71 |
+17:39:12.0 |
HIP 18354 |
5.31 |
| 2026-05-22 00:00 |
03:56:00.40 |
+17:39:48.9 |
HIP 18354 |
8.39 |
| 2026-05-22 12:00 |
03:56:13.08 |
+17:40:25.7 |
HIP 18354 |
11.47 |
| 2026-05-23 00:00 |
03:56:25.76 |
+17:41:02.4 |
HIP 18354 |
14.55 |
| 2026-05-23 12:00 |
03:56:38.44 |
+17:41:38.9 |
HIP 18354 |
17.63 |
| 2026-05-24 00:00 |
03:56:51.11 |
+17:42:15.3 |
HIP 18354 |
20.71 |
| 2026-05-24 12:00 |
03:57:03.78 |
+17:42:51.6 |
HIP 18354 |
23.79 |
| 2026-05-25 00:00 |
03:57:16.45 |
+17:43:27.8 |
HIP 18354 |
26.87 |
| 2026-05-25 12:00 |
03:57:29.12 |
+17:44:03.8 |
HIP 18354 |
29.94 |
| 2026-05-26 00:00 |
03:57:41.78 |
+17:44:39.8 |
HIP 18354 |
33.01 |
| 2026-05-26 12:00 |
03:57:54.43 |
+17:45:15.5 |
HIP 18354 |
36.08 |
| 2026-05-27 00:00 |
03:58:07.08 |
+17:45:51.2 |
HIP 18354 |
39.15 |
| 2026-05-27 12:00 |
03:58:19.72 |
+17:46:26.7 |
HIP 18595 |
39.72 |
| 2026-05-28 00:00 |
03:58:32.36 |
+17:47:02.1 |
HIP 18595 |
39.98 |
| 2026-05-28 12:00 |
03:58:44.99 |
+17:47:37.4 |
HIP 18735 |
37.97 |
| 2026-05-29 00:00 |
03:58:57.61 |
+17:48:12.5 |
HIP 18735 |
35.31 |
| 2026-05-29 12:00 |
03:59:10.23 |
+17:48:47.5 |
HIP 18735 |
32.71 |
| 2026-05-30 00:00 |
03:59:22.83 |
+17:49:22.4 |
HIP 18735 |
30.21 |
| 2026-05-30 12:00 |
03:59:35.43 |
+17:49:57.1 |
HIP 18735 |
27.82 |
| 2026-05-31 00:00 |
03:59:48.02 |
+17:50:31.7 |
HIP 18735 |
25.57 |
| 2026-05-31 12:00 |
04:00:00.60 |
+17:51:06.2 |
HIP 18735 |
23.51 |
| 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 |