| Parameter |
Value |
| Designation |
P/2022 S1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-19T02:31:28.692480Z |
| Orbit solution date (soln_date, UTC) |
2023-04-21T18:43:51Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
8.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-09-23T14:19:53.068800Z |
| Discovery magnitude (MPC) |
20.52 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-11-01.0000000 |
| e |
0.50834103 |
| q (au) |
3.151366 |
| a (au) |
6.409659 |
| i (deg) |
34.581851 |
| Ω (om, deg) |
136.092070 |
| ω (w, deg) |
262.742903 |
| M (ma, deg) |
4.488132 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.398 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.398 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.659 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
12:15:33.30 |
+20:54:14.1 |
HIP 59841 |
10.84 |
| 2026-09-20 12:00 |
12:15:50.38 |
+20:52:54.8 |
HIP 59841 |
6.67 |
| 2026-09-21 00:00 |
12:16:07.47 |
+20:51:36.0 |
HIP 59841 |
2.59 |
| 2026-09-21 12:00 |
12:16:24.56 |
+20:50:17.7 |
HIP 59841 |
2.07 |
| 2026-09-22 00:00 |
12:16:41.65 |
+20:48:59.9 |
HIP 59841 |
6.10 |
| 2026-09-22 12:00 |
12:16:58.76 |
+20:47:42.5 |
HIP 59841 |
10.26 |
| 2026-09-23 00:00 |
12:17:15.86 |
+20:46:25.7 |
HIP 59841 |
14.45 |
| 2026-09-23 12:00 |
12:17:32.97 |
+20:45:09.4 |
HIP 59841 |
18.64 |
| 2026-09-24 00:00 |
12:17:50.07 |
+20:43:53.6 |
HIP 60038 |
16.98 |
| 2026-09-24 12:00 |
12:18:07.19 |
+20:42:38.3 |
HIP 60038 |
13.26 |
| 2026-09-25 00:00 |
12:18:24.30 |
+20:41:23.5 |
HIP 60038 |
9.95 |
| 2026-09-25 12:00 |
12:18:41.41 |
+20:40:09.2 |
HIP 60038 |
7.58 |
| 2026-09-26 00:00 |
12:18:58.52 |
+20:38:55.5 |
HIP 60038 |
7.15 |
| 2026-09-26 12:00 |
12:19:15.64 |
+20:37:42.3 |
HIP 60038 |
8.94 |
| 2026-09-27 00:00 |
12:19:32.75 |
+20:36:29.6 |
HIP 60038 |
11.99 |
| 2026-09-27 12:00 |
12:19:49.86 |
+20:35:17.5 |
HIP 60038 |
15.58 |
| 2026-09-28 00:00 |
12:20:06.97 |
+20:34:05.9 |
HIP 60038 |
19.42 |
| 2026-09-28 12:00 |
12:20:24.08 |
+20:32:54.8 |
HIP 60038 |
23.37 |
| 2026-09-29 00:00 |
12:20:41.18 |
+20:31:44.3 |
HIP 60354 |
26.52 |
| 2026-09-29 12:00 |
12:20:58.28 |
+20:30:34.4 |
HIP 60354 |
22.92 |
| 2026-09-30 00:00 |
12:21:15.38 |
+20:29:25.0 |
HIP 60354 |
19.54 |
| 2026-09-30 12:00 |
12:21:32.47 |
+20:28:16.1 |
HIP 60354 |
16.52 |
| 2026-10-01 00:00 |
12:21:49.56 |
+20:27:07.9 |
HIP 60354 |
14.08 |
| 2026-10-01 12:00 |
12:22:06.65 |
+20:26:00.2 |
HIP 60354 |
12.58 |
| 2026-10-02 00:00 |
12:22:23.73 |
+20:24:53.0 |
HIP 60354 |
12.35 |
| 2026-10-02 12:00 |
12:22:40.80 |
+20:23:46.5 |
HIP 60433 |
12.56 |
| 2026-10-03 00:00 |
12:22:57.86 |
+20:22:40.5 |
HIP 60433 |
8.61 |
| 2026-10-03 12:00 |
12:23:14.92 |
+20:21:35.1 |
HIP 60433 |
5.01 |
| 2026-10-04 00:00 |
12:23:31.97 |
+20:20:30.3 |
HIP 60433 |
3.25 |
| 2026-10-04 12:00 |
12:23:49.02 |
+20:19:26.1 |
HIP 60433 |
5.50 |
| 2026-10-05 00:00 |
12:24:06.05 |
+20:18:22.5 |
HIP 60433 |
9.18 |
| 2026-10-05 12:00 |
12:24:23.08 |
+20:17:19.5 |
HIP 60433 |
13.13 |
| 2026-10-06 00:00 |
12:24:40.09 |
+20:16:17.1 |
HIP 60433 |
17.16 |
| 2026-10-06 12:00 |
12:24:57.09 |
+20:15:15.4 |
HIP 60433 |
21.22 |
| 2026-10-07 00:00 |
12:25:14.09 |
+20:14:14.2 |
HIP 60433 |
25.30 |
| 2026-10-07 12:00 |
12:25:31.07 |
+20:13:13.7 |
HIP 60433 |
29.38 |
| 2026-10-08 00:00 |
12:25:48.03 |
+20:12:13.8 |
HIP 60657 |
28.44 |
| 2026-10-08 12:00 |
12:26:04.99 |
+20:11:14.6 |
HIP 60657 |
27.49 |
| 2026-10-09 00:00 |
12:26:21.93 |
+20:10:16.0 |
HIP 60834 |
26.73 |
| 2026-10-09 12:00 |
12:26:38.86 |
+20:09:18.0 |
HIP 60834 |
23.64 |
| 2026-10-10 00:00 |
12:26:55.77 |
+20:08:20.7 |
HIP 60834 |
20.90 |
| 2026-10-10 12:00 |
12:27:12.66 |
+20:07:24.1 |
HIP 60834 |
18.64 |
| 2026-10-11 00:00 |
12:27:29.54 |
+20:06:28.1 |
HIP 60834 |
17.07 |