| 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) |
| 2026-07-29 00:00 |
04:21:09.26 |
+18:37:36.1 |
HIP 20255 |
12.58 |
| 2026-07-29 12:00 |
04:21:17.22 |
+18:37:47.8 |
HIP 20350 |
13.22 |
| 2026-07-30 00:00 |
04:21:25.12 |
+18:37:59.2 |
HIP 20350 |
13.04 |
| 2026-07-30 12:00 |
04:21:32.94 |
+18:38:10.4 |
HIP 20350 |
13.11 |
| 2026-07-31 00:00 |
04:21:40.70 |
+18:38:21.4 |
HIP 20350 |
13.45 |
| 2026-07-31 12:00 |
04:21:48.39 |
+18:38:32.1 |
HIP 20350 |
14.01 |
| 2026-08-01 00:00 |
04:21:56.02 |
+18:38:42.7 |
HIP 20350 |
14.77 |
| 2026-08-01 12:00 |
04:22:03.57 |
+18:38:53.0 |
HIP 20350 |
15.70 |
| 2026-08-02 00:00 |
04:22:11.06 |
+18:39:03.1 |
HIP 20350 |
16.75 |
| 2026-08-02 12:00 |
04:22:18.47 |
+18:39:12.9 |
HIP 20350 |
17.91 |
| 2026-08-03 00:00 |
04:22:25.81 |
+18:39:22.6 |
HIP 20350 |
19.14 |
| 2026-08-03 12:00 |
04:22:33.09 |
+18:39:32.0 |
HIP 20350 |
20.44 |
| 2026-08-04 00:00 |
04:22:40.29 |
+18:39:41.2 |
HIP 20350 |
21.78 |
| 2026-08-04 12:00 |
04:22:47.42 |
+18:39:50.1 |
HIP 20350 |
23.16 |
| 2026-08-05 00:00 |
04:22:54.48 |
+18:39:58.9 |
HIP 20350 |
24.56 |
| 2026-08-05 12:00 |
04:23:01.47 |
+18:40:07.4 |
HIP 20350 |
25.97 |
| 2026-08-06 00:00 |
04:23:08.38 |
+18:40:15.7 |
HIP 20600 |
26.68 |
| 2026-08-06 12:00 |
04:23:15.22 |
+18:40:23.8 |
HIP 20600 |
25.26 |
| 2026-08-07 00:00 |
04:23:21.99 |
+18:40:31.6 |
HIP 20600 |
23.89 |
| 2026-08-07 12:00 |
04:23:28.68 |
+18:40:39.2 |
HIP 20600 |
22.56 |
| 2026-08-08 00:00 |
04:23:35.29 |
+18:40:46.6 |
HIP 20600 |
21.28 |
| 2026-08-08 12:00 |
04:23:41.84 |
+18:40:53.8 |
HIP 20600 |
20.05 |
| 2026-08-09 00:00 |
04:23:48.30 |
+18:41:00.7 |
HIP 20600 |
18.90 |
| 2026-08-09 12:00 |
04:23:54.69 |
+18:41:07.4 |
HIP 20600 |
17.81 |
| 2026-08-10 00:00 |
04:24:01.01 |
+18:41:13.9 |
HIP 20600 |
16.80 |
| 2026-08-10 12:00 |
04:24:07.24 |
+18:41:20.2 |
HIP 20600 |
15.89 |
| 2026-08-11 00:00 |
04:24:13.40 |
+18:41:26.2 |
HIP 20600 |
15.07 |
| 2026-08-11 12:00 |
04:24:19.48 |
+18:41:32.0 |
HIP 20600 |
14.37 |
| 2026-08-12 00:00 |
04:24:25.48 |
+18:41:37.6 |
HIP 20600 |
13.79 |
| 2026-08-12 12:00 |
04:24:31.41 |
+18:41:43.0 |
HIP 20600 |
13.35 |
| 2026-08-13 00:00 |
04:24:37.25 |
+18:41:48.1 |
HIP 20600 |
13.05 |
| 2026-08-13 12:00 |
04:24:43.02 |
+18:41:53.0 |
HIP 20600 |
12.90 |
| 2026-08-14 00:00 |
04:24:48.70 |
+18:41:57.7 |
HIP 20600 |
12.90 |
| 2026-08-14 12:00 |
04:24:54.31 |
+18:42:02.2 |
HIP 20600 |
13.03 |
| 2026-08-15 00:00 |
04:24:59.83 |
+18:42:06.4 |
HIP 20646 |
12.81 |
| 2026-08-15 12:00 |
04:25:05.27 |
+18:42:10.4 |
HIP 20646 |
12.13 |
| 2026-08-16 00:00 |
04:25:10.64 |
+18:42:14.2 |
HIP 20646 |
11.57 |
| 2026-08-16 12:00 |
04:25:15.92 |
+18:42:17.7 |
HIP 20646 |
11.13 |
| 2026-08-17 00:00 |
04:25:21.11 |
+18:42:21.1 |
HIP 20646 |
10.83 |
| 2026-08-17 12:00 |
04:25:26.23 |
+18:42:24.2 |
HIP 20646 |
10.66 |
| 2026-08-18 00:00 |
04:25:31.26 |
+18:42:27.0 |
HIP 20686 |
10.57 |
| 2026-08-18 12:00 |
04:25:36.22 |
+18:42:29.7 |
HIP 20686 |
10.04 |
| 2026-08-19 00:00 |
04:25:41.08 |
+18:42:32.1 |
HIP 20686 |
9.64 |