P/2022 R1 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
09:27:29.62 |
+09:32:52.3 |
HIP 46454 |
32.73 |
| 2026-02-03 12:00 |
09:27:15.65 |
+09:34:12.6 |
HIP 46197 |
31.56 |
| 2026-02-04 00:00 |
09:27:01.66 |
+09:35:33.2 |
HIP 46197 |
28.46 |
| 2026-02-04 12:00 |
09:26:47.65 |
+09:36:54.2 |
HIP 46197 |
25.52 |
| 2026-02-05 00:00 |
09:26:33.64 |
+09:38:15.4 |
HIP 46197 |
22.80 |
| 2026-02-05 12:00 |
09:26:19.62 |
+09:39:36.9 |
HIP 46197 |
20.40 |
| 2026-02-06 00:00 |
09:26:05.59 |
+09:40:58.7 |
HIP 46197 |
18.45 |
| 2026-02-06 12:00 |
09:25:51.56 |
+09:42:20.7 |
HIP 46197 |
17.09 |
| 2026-02-07 00:00 |
09:25:37.53 |
+09:43:43.0 |
HIP 46197 |
16.48 |
| 2026-02-07 12:00 |
09:25:23.49 |
+09:45:05.6 |
HIP 46160 |
16.01 |
| 2026-02-08 00:00 |
09:25:09.46 |
+09:46:28.3 |
HIP 46160 |
15.79 |
| 2026-02-08 12:00 |
09:24:55.44 |
+09:47:51.3 |
HIP 46160 |
16.43 |
| 2026-02-09 00:00 |
09:24:41.42 |
+09:49:14.5 |
HIP 46160 |
17.85 |
| 2026-02-09 12:00 |
09:24:27.41 |
+09:50:37.8 |
HIP 46160 |
19.88 |
| 2026-02-10 00:00 |
09:24:13.42 |
+09:52:01.4 |
HIP 46160 |
22.34 |
| 2026-02-10 12:00 |
09:23:59.44 |
+09:53:25.1 |
HIP 46160 |
25.12 |
| 2026-02-11 00:00 |
09:23:45.48 |
+09:54:48.9 |
HIP 46160 |
28.12 |
| 2026-02-11 12:00 |
09:23:31.54 |
+09:56:12.9 |
HIP 46160 |
31.27 |
| 2026-02-12 00:00 |
09:23:17.62 |
+09:57:37.0 |
HIP 46160 |
34.52 |
| 2026-02-12 12:00 |
09:23:03.72 |
+09:59:01.2 |
HIP 46106 |
37.45 |
| 2026-02-13 00:00 |
09:22:49.85 |
+10:00:25.5 |
HIP 46106 |
37.83 |
| 2026-02-13 12:00 |
09:22:36.01 |
+10:01:49.9 |
HIP 46106 |
38.56 |
| 2026-02-14 00:00 |
09:22:22.20 |
+10:03:14.4 |
HIP 46106 |
39.61 |
| 2026-02-14 12:00 |
09:22:08.43 |
+10:04:39.0 |
HIP 46106 |
40.96 |
| 2026-02-15 00:00 |
09:21:54.69 |
+10:06:03.6 |
HIP 45740 |
40.09 |
| 2026-02-15 12:00 |
09:21:41.00 |
+10:07:28.2 |
HIP 45740 |
37.87 |
| 2026-02-16 00:00 |
09:21:27.34 |
+10:08:52.8 |
HIP 45740 |
35.89 |
| 2026-02-16 12:00 |
09:21:13.73 |
+10:10:17.5 |
HIP 45740 |
34.19 |
| 2026-02-17 00:00 |
09:21:00.16 |
+10:11:42.2 |
HIP 45740 |
32.82 |
| 2026-02-17 12:00 |
09:20:46.64 |
+10:13:06.8 |
HIP 45740 |
31.81 |
| 2026-02-18 00:00 |
09:20:33.18 |
+10:14:31.4 |
HIP 45740 |
31.19 |
| 2026-02-18 12:00 |
09:20:19.76 |
+10:15:56.0 |
HIP 45740 |
30.99 |
| 2026-02-19 00:00 |
09:20:06.41 |
+10:17:20.5 |
HIP 45740 |
31.21 |
| 2026-02-19 12:00 |
09:19:53.11 |
+10:18:44.9 |
HIP 45691 |
28.48 |
| 2026-02-20 00:00 |
09:19:39.87 |
+10:20:09.3 |
HIP 45691 |
25.66 |
| 2026-02-20 12:00 |
09:19:26.69 |
+10:21:33.6 |
HIP 45691 |
23.06 |
| 2026-02-21 00:00 |
09:19:13.58 |
+10:22:57.8 |
HIP 45691 |
20.73 |
| 2026-02-21 12:00 |
09:19:00.53 |
+10:24:21.8 |
HIP 45691 |
18.79 |
| 2026-02-22 00:00 |
09:18:47.56 |
+10:25:45.7 |
HIP 45691 |
17.34 |
| 2026-02-22 12:00 |
09:18:34.65 |
+10:27:09.5 |
HIP 45691 |
16.50 |
| 2026-02-23 00:00 |
09:18:21.82 |
+10:28:33.1 |
HIP 45691 |
16.37 |
| 2026-02-23 12:00 |
09:18:09.06 |
+10:29:56.6 |
HIP 45691 |
16.94 |
| 2026-02-24 00:00 |
09:17:56.38 |
+10:31:19.9 |
HIP 45691 |
18.14 |