| Parameter |
Value |
| Designation |
C/2020 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-02-24T07:21:20.217600Z |
| Orbit solution date (soln_date, UTC) |
2024-03-19T12:12:36Z |
| Obs used |
386 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
11.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-12T07:30:45.878400Z |
| Discovery magnitude (MPC) |
20.51 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-07-17.0000000 |
| e |
0.98865011 |
| q (au) |
4.692155 |
| a (au) |
413.409849 |
| i (deg) |
53.224771 |
| Ω (om, deg) |
195.092039 |
| ω (w, deg) |
211.709686 |
| M (ma, deg) |
359.973933 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.419 + 4.508\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.419 |
| n |
4.508 |
| gf |
0.935 |
| gb |
-0.960 |
| k |
1.000 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
10:18:55.75 |
-23:18:32.9 |
HIP 50504 |
7.77 |
| 2026-09-20 12:00 |
10:19:06.12 |
-23:19:30.8 |
HIP 50504 |
9.37 |
| 2026-09-21 00:00 |
10:19:16.46 |
-23:20:29.0 |
HIP 50504 |
11.33 |
| 2026-09-21 12:00 |
10:19:26.76 |
-23:21:27.7 |
HIP 50504 |
13.50 |
| 2026-09-22 00:00 |
10:19:37.03 |
-23:22:26.7 |
HIP 50504 |
15.78 |
| 2026-09-22 12:00 |
10:19:47.27 |
-23:23:26.0 |
HIP 50504 |
18.14 |
| 2026-09-23 00:00 |
10:19:57.47 |
-23:24:25.8 |
HIP 50638 |
16.23 |
| 2026-09-23 12:00 |
10:20:07.64 |
-23:25:25.9 |
HIP 50638 |
14.26 |
| 2026-09-24 00:00 |
10:20:17.77 |
-23:26:26.3 |
HIP 50638 |
12.50 |
| 2026-09-24 12:00 |
10:20:27.87 |
-23:27:27.1 |
HIP 50638 |
11.04 |
| 2026-09-25 00:00 |
10:20:37.94 |
-23:28:28.3 |
HIP 50638 |
10.01 |
| 2026-09-25 12:00 |
10:20:47.97 |
-23:29:29.8 |
HIP 50638 |
9.54 |
| 2026-09-26 00:00 |
10:20:57.96 |
-23:30:31.7 |
HIP 50638 |
9.71 |
| 2026-09-26 12:00 |
10:21:07.92 |
-23:31:33.8 |
HIP 50638 |
10.49 |
| 2026-09-27 00:00 |
10:21:17.84 |
-23:32:36.4 |
HIP 50728 |
10.35 |
| 2026-09-27 12:00 |
10:21:27.73 |
-23:33:39.2 |
HIP 50728 |
9.00 |
| 2026-09-28 00:00 |
10:21:37.58 |
-23:34:42.4 |
HIP 50728 |
8.20 |
| 2026-09-28 12:00 |
10:21:47.39 |
-23:35:45.9 |
HIP 50728 |
8.11 |
| 2026-09-29 00:00 |
10:21:57.16 |
-23:36:49.8 |
HIP 50728 |
8.74 |
| 2026-09-29 12:00 |
10:22:06.89 |
-23:37:53.9 |
HIP 50728 |
9.95 |
| 2026-09-30 00:00 |
10:22:16.58 |
-23:38:58.4 |
HIP 50728 |
11.56 |
| 2026-09-30 12:00 |
10:22:26.23 |
-23:40:03.2 |
HIP 50728 |
13.43 |
| 2026-10-01 00:00 |
10:22:35.85 |
-23:41:08.3 |
HIP 50728 |
15.45 |
| 2026-10-01 12:00 |
10:22:45.42 |
-23:42:13.6 |
HIP 50728 |
17.57 |
| 2026-10-02 00:00 |
10:22:54.95 |
-23:43:19.3 |
HIP 50897 |
18.04 |
| 2026-10-02 12:00 |
10:23:04.44 |
-23:44:25.3 |
HIP 50897 |
17.98 |
| 2026-10-03 00:00 |
10:23:13.89 |
-23:45:31.6 |
HIP 50897 |
18.26 |
| 2026-10-03 12:00 |
10:23:23.30 |
-23:46:38.2 |
HIP 50897 |
18.86 |
| 2026-10-04 00:00 |
10:23:32.67 |
-23:47:45.0 |
HIP 50897 |
19.74 |
| 2026-10-04 12:00 |
10:23:41.99 |
-23:48:52.2 |
HIP 50897 |
20.87 |
| 2026-10-05 00:00 |
10:23:51.26 |
-23:49:59.6 |
HIP 50897 |
22.21 |
| 2026-10-05 12:00 |
10:24:00.50 |
-23:51:07.3 |
HIP 50897 |
23.72 |
| 2026-10-06 00:00 |
10:24:09.69 |
-23:52:15.2 |
HIP 51012 |
25.22 |
| 2026-10-06 12:00 |
10:24:18.83 |
-23:53:23.4 |
HIP 51012 |
24.95 |
| 2026-10-07 00:00 |
10:24:27.93 |
-23:54:31.9 |
HIP 51012 |
24.92 |
| 2026-10-07 12:00 |
10:24:36.98 |
-23:55:40.6 |
HIP 51012 |
25.13 |
| 2026-10-08 00:00 |
10:24:45.99 |
-23:56:49.6 |
HIP 51012 |
25.56 |
| 2026-10-08 12:00 |
10:24:54.94 |
-23:57:58.8 |
HIP 51012 |
26.20 |
| 2026-10-09 00:00 |
10:25:03.85 |
-23:59:08.3 |
HIP 51012 |
27.04 |
| 2026-10-09 12:00 |
10:25:12.72 |
-24:00:18.0 |
HIP 51012 |
28.05 |
| 2026-10-10 00:00 |
10:25:21.53 |
-24:01:27.9 |
HIP 51012 |
29.22 |
| 2026-10-10 12:00 |
10:25:30.30 |
-24:02:38.1 |
HIP 51186 |
29.59 |
| 2026-10-11 00:00 |
10:25:39.01 |
-24:03:48.4 |
HIP 51186 |
28.59 |