P/2022 S1 (PANSTARRS)
| 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 |
0.998 |
| 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) |
| 2026-02-03 00:00 |
12:04:53.76 |
+23:02:59.0 |
HIP 59015 |
18.01 |
| 2026-02-03 12:00 |
12:04:46.99 |
+23:05:32.3 |
HIP 59015 |
18.26 |
| 2026-02-04 00:00 |
12:04:40.09 |
+23:08:05.7 |
HIP 59015 |
19.02 |
| 2026-02-04 12:00 |
12:04:33.07 |
+23:10:39.2 |
HIP 59015 |
20.23 |
| 2026-02-05 00:00 |
12:04:25.92 |
+23:13:12.9 |
HIP 59015 |
21.83 |
| 2026-02-05 12:00 |
12:04:18.64 |
+23:15:46.6 |
HIP 59015 |
23.73 |
| 2026-02-06 00:00 |
12:04:11.24 |
+23:18:20.3 |
HIP 59015 |
25.89 |
| 2026-02-06 12:00 |
12:04:03.71 |
+23:20:54.1 |
HIP 59015 |
28.25 |
| 2026-02-07 00:00 |
12:03:56.06 |
+23:23:28.0 |
HIP 59015 |
30.76 |
| 2026-02-07 12:00 |
12:03:48.29 |
+23:26:01.8 |
HIP 59015 |
33.39 |
| 2026-02-08 00:00 |
12:03:40.40 |
+23:28:35.6 |
HIP 59015 |
36.13 |
| 2026-02-08 12:00 |
12:03:32.38 |
+23:31:09.4 |
HIP 58850 |
37.14 |
| 2026-02-09 00:00 |
12:03:24.25 |
+23:33:43.2 |
HIP 58850 |
35.19 |
| 2026-02-09 12:00 |
12:03:16.00 |
+23:36:16.9 |
HIP 58850 |
33.44 |
| 2026-02-10 00:00 |
12:03:07.63 |
+23:38:50.5 |
HIP 58850 |
31.93 |
| 2026-02-10 12:00 |
12:02:59.14 |
+23:41:24.1 |
HIP 58850 |
30.69 |
| 2026-02-11 00:00 |
12:02:50.54 |
+23:43:57.5 |
HIP 58850 |
29.76 |
| 2026-02-11 12:00 |
12:02:41.82 |
+23:46:30.8 |
HIP 58850 |
29.18 |
| 2026-02-12 00:00 |
12:02:32.99 |
+23:49:03.9 |
HIP 58850 |
28.98 |
| 2026-02-12 12:00 |
12:02:24.05 |
+23:51:36.9 |
HIP 58621 |
26.27 |
| 2026-02-13 00:00 |
12:02:15.00 |
+23:54:09.7 |
HIP 58621 |
23.00 |
| 2026-02-13 12:00 |
12:02:05.84 |
+23:56:42.3 |
HIP 58621 |
19.72 |
| 2026-02-14 00:00 |
12:01:56.57 |
+23:59:14.6 |
HIP 58621 |
16.43 |
| 2026-02-14 12:00 |
12:01:47.19 |
+24:01:46.8 |
HIP 58621 |
13.15 |
| 2026-02-15 00:00 |
12:01:37.71 |
+24:04:18.6 |
HIP 58621 |
9.88 |
| 2026-02-15 12:00 |
12:01:28.12 |
+24:06:50.2 |
HIP 58621 |
6.67 |
| 2026-02-16 00:00 |
12:01:18.43 |
+24:09:21.6 |
HIP 58621 |
3.71 |
| 2026-02-16 12:00 |
12:01:08.64 |
+24:11:52.6 |
HIP 58621 |
2.37 |
| 2026-02-17 00:00 |
12:00:58.75 |
+24:14:23.2 |
HIP 58621 |
4.50 |
| 2026-02-17 12:00 |
12:00:48.76 |
+24:16:53.6 |
HIP 58621 |
7.61 |
| 2026-02-18 00:00 |
12:00:38.67 |
+24:19:23.5 |
HIP 58621 |
10.90 |
| 2026-02-18 12:00 |
12:00:28.48 |
+24:21:53.1 |
HIP 58621 |
14.25 |
| 2026-02-19 00:00 |
12:00:18.21 |
+24:24:22.3 |
HIP 58621 |
17.64 |
| 2026-02-19 12:00 |
12:00:07.84 |
+24:26:51.0 |
HIP 58454 |
16.41 |
| 2026-02-20 00:00 |
11:59:57.37 |
+24:29:19.3 |
HIP 58454 |
13.00 |
| 2026-02-20 12:00 |
11:59:46.82 |
+24:31:47.2 |
HIP 58454 |
9.58 |
| 2026-02-21 00:00 |
11:59:36.18 |
+24:34:14.6 |
HIP 58454 |
6.18 |
| 2026-02-21 12:00 |
11:59:25.46 |
+24:36:41.5 |
HIP 58454 |
2.87 |
| 2026-02-22 00:00 |
11:59:14.65 |
+24:39:07.8 |
HIP 58454 |
1.47 |
| 2026-02-22 12:00 |
11:59:03.76 |
+24:41:33.7 |
HIP 58454 |
4.48 |
| 2026-02-23 00:00 |
11:58:52.78 |
+24:43:59.0 |
HIP 58454 |
7.88 |
| 2026-02-23 12:00 |
11:58:41.73 |
+24:46:23.7 |
HIP 58454 |
11.33 |
| 2026-02-24 00:00 |
11:58:30.60 |
+24:48:47.9 |
HIP 58454 |
14.80 |