| Parameter |
Value |
| Designation |
P/2022 R1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-10-12T05:04:08.492160Z |
| Orbit solution date (soln_date, UTC) |
2024-06-21T13:42:19Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-09-01T08:30:18.777600Z |
| Discovery magnitude (MPC) |
20.80 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-12-12.0000000 |
| e |
0.50312159 |
| q (au) |
3.569380 |
| a (au) |
7.183609 |
| i (deg) |
7.408376 |
| Ω (om, deg) |
176.174861 |
| ω (w, deg) |
222.612489 |
| M (ma, deg) |
344.427252 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.019 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.019 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
09:11:51.35 |
+12:19:35.6 |
HIP 45216 |
16.08 |
| 2026-05-12 12:00 |
09:12:00.22 |
+12:19:24.7 |
HIP 45216 |
13.97 |
| 2026-05-13 00:00 |
09:12:09.21 |
+12:19:13.1 |
HIP 45216 |
11.84 |
| 2026-05-13 12:00 |
09:12:18.32 |
+12:19:00.9 |
HIP 45216 |
9.71 |
| 2026-05-14 00:00 |
09:12:27.56 |
+12:18:47.9 |
HIP 45216 |
7.61 |
| 2026-05-14 12:00 |
09:12:36.92 |
+12:18:34.3 |
HIP 45216 |
5.60 |
| 2026-05-15 00:00 |
09:12:46.40 |
+12:18:20.0 |
HIP 45216 |
3.92 |
| 2026-05-15 12:00 |
09:12:56.01 |
+12:18:05.0 |
HIP 45216 |
3.17 |
| 2026-05-16 00:00 |
09:13:05.74 |
+12:17:49.3 |
HIP 45216 |
4.00 |
| 2026-05-16 12:00 |
09:13:15.58 |
+12:17:32.9 |
HIP 45216 |
5.80 |
| 2026-05-17 00:00 |
09:13:25.55 |
+12:17:15.8 |
HIP 45216 |
7.96 |
| 2026-05-17 12:00 |
09:13:35.64 |
+12:16:58.1 |
HIP 45216 |
10.28 |
| 2026-05-18 00:00 |
09:13:45.84 |
+12:16:39.7 |
HIP 45216 |
12.69 |
| 2026-05-18 12:00 |
09:13:56.16 |
+12:16:20.6 |
HIP 45216 |
15.16 |
| 2026-05-19 00:00 |
09:14:06.60 |
+12:16:00.9 |
HIP 45216 |
17.68 |
| 2026-05-19 12:00 |
09:14:17.15 |
+12:15:40.5 |
HIP 45216 |
20.23 |
| 2026-05-20 00:00 |
09:14:27.81 |
+12:15:19.4 |
HIP 45216 |
22.83 |
| 2026-05-20 12:00 |
09:14:38.59 |
+12:14:57.6 |
HIP 45216 |
25.46 |
| 2026-05-21 00:00 |
09:14:49.49 |
+12:14:35.2 |
HIP 45216 |
28.12 |
| 2026-05-21 12:00 |
09:15:00.49 |
+12:14:12.2 |
HIP 45538 |
30.12 |
| 2026-05-22 00:00 |
09:15:11.61 |
+12:13:48.4 |
HIP 45538 |
27.83 |
| 2026-05-22 12:00 |
09:15:22.84 |
+12:13:24.1 |
HIP 45538 |
25.62 |
| 2026-05-23 00:00 |
09:15:34.17 |
+12:12:59.0 |
HIP 45538 |
23.50 |
| 2026-05-23 12:00 |
09:15:45.62 |
+12:12:33.4 |
HIP 45538 |
21.54 |
| 2026-05-24 00:00 |
09:15:57.17 |
+12:12:07.0 |
HIP 45538 |
19.76 |
| 2026-05-24 12:00 |
09:16:08.83 |
+12:11:40.1 |
HIP 45538 |
18.26 |
| 2026-05-25 00:00 |
09:16:20.59 |
+12:11:12.5 |
HIP 45538 |
17.12 |
| 2026-05-25 12:00 |
09:16:32.46 |
+12:10:44.2 |
HIP 45538 |
16.42 |
| 2026-05-26 00:00 |
09:16:44.43 |
+12:10:15.3 |
HIP 45538 |
16.23 |
| 2026-05-26 12:00 |
09:16:56.51 |
+12:09:45.8 |
HIP 45538 |
16.59 |
| 2026-05-27 00:00 |
09:17:08.69 |
+12:09:15.7 |
HIP 45538 |
17.48 |
| 2026-05-27 12:00 |
09:17:20.97 |
+12:08:44.9 |
HIP 45538 |
18.84 |
| 2026-05-28 00:00 |
09:17:33.35 |
+12:08:13.6 |
HIP 45538 |
20.58 |
| 2026-05-28 12:00 |
09:17:45.84 |
+12:07:41.6 |
HIP 45695 |
20.49 |
| 2026-05-29 00:00 |
09:17:58.42 |
+12:07:08.9 |
HIP 45695 |
18.36 |
| 2026-05-29 12:00 |
09:18:11.10 |
+12:06:35.7 |
HIP 45695 |
16.54 |
| 2026-05-30 00:00 |
09:18:23.88 |
+12:06:01.8 |
HIP 45695 |
15.16 |
| 2026-05-30 12:00 |
09:18:36.75 |
+12:05:27.3 |
HIP 45695 |
14.37 |
| 2026-05-31 00:00 |
09:18:49.72 |
+12:04:52.3 |
HIP 45695 |
14.27 |
| 2026-05-31 12:00 |
09:19:02.79 |
+12:04:16.6 |
HIP 45695 |
14.90 |
| 2026-06-01 00:00 |
09:19:15.95 |
+12:03:40.3 |
HIP 45695 |
16.18 |
| 2026-06-01 12:00 |
09:19:29.21 |
+12:03:03.4 |
HIP 45695 |
18.00 |
| 2026-06-02 00:00 |
09:19:42.56 |
+12:02:25.9 |
HIP 45855 |
18.81 |