| Parameter |
Value |
| Designation |
P/2022 O2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-01-07T02:42:09.590400Z |
| Orbit solution date (soln_date, UTC) |
2023-04-21T18:43:49Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
19.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-07-21T09:38:06.057600Z |
| Discovery magnitude (MPC) |
20.85 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-10-21.0000000 |
| e |
0.72168447 |
| q (au) |
1.756806 |
| a (au) |
6.312283 |
| i (deg) |
9.425474 |
| Ω (om, deg) |
330.499830 |
| ω (w, deg) |
48.642131 |
| M (ma, deg) |
355.145488 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.985 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.985 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:29:38.46 |
-00:13:03.3 |
HIP 56056 |
8.83 |
| 2026-09-20 12:00 |
11:29:51.80 |
-00:14:36.7 |
HIP 56056 |
9.95 |
| 2026-09-21 00:00 |
11:30:05.13 |
-00:16:10.1 |
HIP 56056 |
12.13 |
| 2026-09-21 12:00 |
11:30:18.45 |
-00:17:43.5 |
HIP 56056 |
14.91 |
| 2026-09-22 00:00 |
11:30:31.76 |
-00:19:16.9 |
HIP 56056 |
18.01 |
| 2026-09-22 12:00 |
11:30:45.05 |
-00:20:50.3 |
HIP 56056 |
21.29 |
| 2026-09-23 00:00 |
11:30:58.33 |
-00:22:23.7 |
HIP 56282 |
20.21 |
| 2026-09-23 12:00 |
11:31:11.59 |
-00:23:57.1 |
HIP 56282 |
16.77 |
| 2026-09-24 00:00 |
11:31:24.84 |
-00:25:30.5 |
HIP 56282 |
13.45 |
| 2026-09-24 12:00 |
11:31:38.07 |
-00:27:03.9 |
HIP 56282 |
10.36 |
| 2026-09-25 00:00 |
11:31:51.29 |
-00:28:37.3 |
HIP 56282 |
7.79 |
| 2026-09-25 12:00 |
11:32:04.49 |
-00:30:10.7 |
HIP 56282 |
6.38 |
| 2026-09-26 00:00 |
11:32:17.67 |
-00:31:44.1 |
HIP 56282 |
6.88 |
| 2026-09-26 12:00 |
11:32:30.84 |
-00:33:17.4 |
HIP 56282 |
8.97 |
| 2026-09-27 00:00 |
11:32:43.99 |
-00:34:50.8 |
HIP 56282 |
11.84 |
| 2026-09-27 12:00 |
11:32:57.12 |
-00:36:24.1 |
HIP 56282 |
15.04 |
| 2026-09-28 00:00 |
11:33:10.23 |
-00:37:57.3 |
HIP 56282 |
18.39 |
| 2026-09-28 12:00 |
11:33:23.33 |
-00:39:30.6 |
HIP 56282 |
21.83 |
| 2026-09-29 00:00 |
11:33:36.40 |
-00:41:03.8 |
HIP 56282 |
25.32 |
| 2026-09-29 12:00 |
11:33:49.45 |
-00:42:37.0 |
HIP 56282 |
28.83 |
| 2026-09-30 00:00 |
11:34:02.48 |
-00:44:10.1 |
HIP 56282 |
32.37 |
| 2026-09-30 12:00 |
11:34:15.49 |
-00:45:43.2 |
HIP 56282 |
35.91 |
| 2026-10-01 00:00 |
11:34:28.48 |
-00:47:16.3 |
HIP 56647 |
37.17 |
| 2026-10-01 12:00 |
11:34:41.45 |
-00:48:49.2 |
HIP 56647 |
33.87 |
| 2026-10-02 00:00 |
11:34:54.40 |
-00:50:22.2 |
HIP 56647 |
30.64 |
| 2026-10-02 12:00 |
11:35:07.32 |
-00:51:55.1 |
HIP 56647 |
27.51 |
| 2026-10-03 00:00 |
11:35:20.21 |
-00:53:27.9 |
HIP 56647 |
24.51 |
| 2026-10-03 12:00 |
11:35:33.09 |
-00:55:00.7 |
HIP 56647 |
21.69 |
| 2026-10-04 00:00 |
11:35:45.93 |
-00:56:33.3 |
HIP 56647 |
19.12 |
| 2026-10-04 12:00 |
11:35:58.76 |
-00:58:06.0 |
HIP 56647 |
16.93 |
| 2026-10-05 00:00 |
11:36:11.55 |
-00:59:38.5 |
HIP 56647 |
15.26 |
| 2026-10-05 12:00 |
11:36:24.32 |
-01:01:11.0 |
HIP 56677 |
13.65 |
| 2026-10-06 00:00 |
11:36:37.06 |
-01:02:43.4 |
HIP 56677 |
10.18 |
| 2026-10-06 12:00 |
11:36:49.78 |
-01:04:15.7 |
HIP 56677 |
6.79 |
| 2026-10-07 00:00 |
11:37:02.46 |
-01:05:47.9 |
HIP 56677 |
3.69 |
| 2026-10-07 12:00 |
11:37:15.12 |
-01:07:20.0 |
HIP 56677 |
2.44 |
| 2026-10-08 00:00 |
11:37:27.75 |
-01:08:52.0 |
HIP 56677 |
4.79 |
| 2026-10-08 12:00 |
11:37:40.35 |
-01:10:23.9 |
HIP 56677 |
8.03 |
| 2026-10-09 00:00 |
11:37:52.91 |
-01:11:55.7 |
HIP 56677 |
11.41 |
| 2026-10-09 12:00 |
11:38:05.45 |
-01:13:27.3 |
HIP 56677 |
14.84 |
| 2026-10-10 00:00 |
11:38:17.95 |
-01:14:58.9 |
HIP 56677 |
18.29 |
| 2026-10-10 12:00 |
11:38:30.42 |
-01:16:30.4 |
HIP 56691 |
20.24 |
| 2026-10-11 00:00 |
11:38:42.85 |
-01:18:01.7 |
HIP 56738 |
21.00 |