| 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 |
0.925 |
| 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) |
| 2026-03-26 00:00 |
09:41:00.55 |
-27:58:34.8 |
HIP 47500 |
7.50 |
| 2026-03-26 12:00 |
09:40:55.10 |
-27:56:37.8 |
HIP 47500 |
5.82 |
| 2026-03-27 00:00 |
09:40:49.73 |
-27:54:40.5 |
HIP 47500 |
4.69 |
| 2026-03-27 12:00 |
09:40:44.44 |
-27:52:42.8 |
HIP 47500 |
4.52 |
| 2026-03-28 00:00 |
09:40:39.23 |
-27:50:44.7 |
HIP 47500 |
5.39 |
| 2026-03-28 12:00 |
09:40:34.10 |
-27:48:46.4 |
HIP 47500 |
6.92 |
| 2026-03-29 00:00 |
09:40:29.05 |
-27:46:47.7 |
HIP 47500 |
8.77 |
| 2026-03-29 12:00 |
09:40:24.08 |
-27:44:48.8 |
HIP 47500 |
10.76 |
| 2026-03-30 00:00 |
09:40:19.19 |
-27:42:49.5 |
HIP 47500 |
12.84 |
| 2026-03-30 12:00 |
09:40:14.38 |
-27:40:50.0 |
HIP 47500 |
14.97 |
| 2026-03-31 00:00 |
09:40:09.65 |
-27:38:50.2 |
HIP 47500 |
17.11 |
| 2026-03-31 12:00 |
09:40:05.00 |
-27:36:50.2 |
HIP 47500 |
19.28 |
| 2026-04-01 00:00 |
09:40:00.44 |
-27:34:49.9 |
HIP 47500 |
21.45 |
| 2026-04-01 12:00 |
09:39:55.96 |
-27:32:49.3 |
HIP 47500 |
23.63 |
| 2026-04-02 00:00 |
09:39:51.57 |
-27:30:48.5 |
HIP 47500 |
25.81 |
| 2026-04-02 12:00 |
09:39:47.25 |
-27:28:47.6 |
HIP 47519 |
25.58 |
| 2026-04-03 00:00 |
09:39:43.02 |
-27:26:46.4 |
HIP 47519 |
25.09 |
| 2026-04-03 12:00 |
09:39:38.88 |
-27:24:45.0 |
HIP 47519 |
24.76 |
| 2026-04-04 00:00 |
09:39:34.82 |
-27:22:43.4 |
HIP 47519 |
24.62 |
| 2026-04-04 12:00 |
09:39:30.84 |
-27:20:41.6 |
HIP 47519 |
24.65 |
| 2026-04-05 00:00 |
09:39:26.95 |
-27:18:39.7 |
HIP 47519 |
24.87 |
| 2026-04-05 12:00 |
09:39:23.15 |
-27:16:37.6 |
HIP 47519 |
25.26 |
| 2026-04-06 00:00 |
09:39:19.43 |
-27:14:35.3 |
HIP 47519 |
25.81 |
| 2026-04-06 12:00 |
09:39:15.80 |
-27:12:32.9 |
HIP 47519 |
26.52 |
| 2026-04-07 00:00 |
09:39:12.25 |
-27:10:30.4 |
HIP 47519 |
27.36 |
| 2026-04-07 12:00 |
09:39:08.79 |
-27:08:27.8 |
HIP 47519 |
28.33 |
| 2026-04-08 00:00 |
09:39:05.42 |
-27:06:25.1 |
HIP 47519 |
29.41 |
| 2026-04-08 12:00 |
09:39:02.13 |
-27:04:22.3 |
HIP 47519 |
30.60 |
| 2026-04-09 00:00 |
09:38:58.94 |
-27:02:19.3 |
HIP 47180 |
30.10 |
| 2026-04-09 12:00 |
09:38:55.83 |
-27:00:16.3 |
HIP 47180 |
28.77 |
| 2026-04-10 00:00 |
09:38:52.81 |
-26:58:13.3 |
HIP 47180 |
27.56 |
| 2026-04-10 12:00 |
09:38:49.88 |
-26:56:10.1 |
HIP 47180 |
26.50 |
| 2026-04-11 00:00 |
09:38:47.03 |
-26:54:07.0 |
HIP 47180 |
25.58 |
| 2026-04-11 12:00 |
09:38:44.28 |
-26:52:03.8 |
HIP 47180 |
24.85 |
| 2026-04-12 00:00 |
09:38:41.61 |
-26:50:00.5 |
HIP 47180 |
24.29 |
| 2026-04-12 12:00 |
09:38:39.04 |
-26:47:57.3 |
HIP 47180 |
23.94 |
| 2026-04-13 00:00 |
09:38:36.55 |
-26:45:54.0 |
HIP 47180 |
23.79 |
| 2026-04-13 12:00 |
09:38:34.16 |
-26:43:50.8 |
HIP 47180 |
23.85 |
| 2026-04-14 00:00 |
09:38:31.85 |
-26:41:47.5 |
HIP 47180 |
24.12 |
| 2026-04-14 12:00 |
09:38:29.64 |
-26:39:44.3 |
HIP 47180 |
24.58 |
| 2026-04-15 00:00 |
09:38:27.51 |
-26:37:41.1 |
HIP 47180 |
25.23 |
| 2026-04-15 12:00 |
09:38:25.48 |
-26:35:38.0 |
HIP 47180 |
26.05 |
| 2026-04-16 00:00 |
09:38:23.54 |
-26:33:34.9 |
HIP 47180 |
27.03 |