| Parameter |
Value |
| Designation |
P/2024 OC2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-10-09T07:52:40.143360Z |
| Orbit solution date (soln_date, UTC) |
2025-01-14T17:42:19Z |
| Obs used |
43 |
| NEO |
Yes |
| M1 |
20.700 |
| K1 |
14.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-08-20.0000000 |
| e |
0.77423172 |
| q (au) |
0.592825 |
| a (au) |
2.625811 |
| i (deg) |
7.671223 |
| Ω (om, deg) |
136.619189 |
| ω (w, deg) |
258.539659 |
| M (ma, deg) |
348.342092 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
13:13:57.56 |
-00:16:04.8 |
HIP 64571 |
2.21 |
| 2026-07-29 12:00 |
13:14:09.27 |
-00:17:56.0 |
HIP 64571 |
2.67 |
| 2026-07-30 00:00 |
13:14:21.11 |
-00:19:47.9 |
HIP 64571 |
5.81 |
| 2026-07-30 12:00 |
13:14:33.10 |
-00:21:40.4 |
HIP 64571 |
9.25 |
| 2026-07-31 00:00 |
13:14:45.22 |
-00:23:33.5 |
HIP 64571 |
12.77 |
| 2026-07-31 12:00 |
13:14:57.48 |
-00:25:27.1 |
HIP 64571 |
16.34 |
| 2026-08-01 00:00 |
13:15:09.87 |
-00:27:21.4 |
HIP 64571 |
19.96 |
| 2026-08-01 12:00 |
13:15:22.40 |
-00:29:16.2 |
HIP 64571 |
23.62 |
| 2026-08-02 00:00 |
13:15:35.07 |
-00:31:11.5 |
HIP 64571 |
27.31 |
| 2026-08-02 12:00 |
13:15:47.87 |
-00:33:07.4 |
HIP 64838 |
26.57 |
| 2026-08-03 00:00 |
13:16:00.80 |
-00:35:03.9 |
HIP 64838 |
22.94 |
| 2026-08-03 12:00 |
13:16:13.87 |
-00:37:00.9 |
HIP 64838 |
19.33 |
| 2026-08-04 00:00 |
13:16:27.06 |
-00:38:58.4 |
HIP 64838 |
15.79 |
| 2026-08-04 12:00 |
13:16:40.39 |
-00:40:56.4 |
HIP 64838 |
12.38 |
| 2026-08-05 00:00 |
13:16:53.85 |
-00:42:55.0 |
HIP 64838 |
9.31 |
| 2026-08-05 12:00 |
13:17:07.43 |
-00:44:54.1 |
HIP 64838 |
7.10 |
| 2026-08-06 00:00 |
13:17:21.14 |
-00:46:53.7 |
HIP 64838 |
6.70 |
| 2026-08-06 12:00 |
13:17:34.98 |
-00:48:53.8 |
HIP 64838 |
8.43 |
| 2026-08-07 00:00 |
13:17:48.95 |
-00:50:54.5 |
HIP 64838 |
11.39 |
| 2026-08-07 12:00 |
13:18:03.04 |
-00:52:55.6 |
HIP 64838 |
14.88 |
| 2026-08-08 00:00 |
13:18:17.26 |
-00:54:57.2 |
HIP 64838 |
18.64 |
| 2026-08-08 12:00 |
13:18:31.60 |
-00:56:59.2 |
HIP 64968 |
20.30 |
| 2026-08-09 00:00 |
13:18:46.07 |
-00:59:01.8 |
HIP 64968 |
17.40 |
| 2026-08-09 12:00 |
13:19:00.66 |
-01:01:04.8 |
HIP 64968 |
15.09 |
| 2026-08-10 00:00 |
13:19:15.37 |
-01:03:08.2 |
HIP 64968 |
13.70 |
| 2026-08-10 12:00 |
13:19:30.20 |
-01:05:12.2 |
HIP 64968 |
13.55 |
| 2026-08-11 00:00 |
13:19:45.15 |
-01:07:16.5 |
HIP 64968 |
14.69 |
| 2026-08-11 12:00 |
13:20:00.22 |
-01:09:21.3 |
HIP 64968 |
16.90 |
| 2026-08-12 00:00 |
13:20:15.41 |
-01:11:26.6 |
HIP 64968 |
19.83 |
| 2026-08-12 12:00 |
13:20:30.71 |
-01:13:32.2 |
HIP 64968 |
23.24 |
| 2026-08-13 00:00 |
13:20:46.13 |
-01:15:38.3 |
HIP 65083 |
24.36 |
| 2026-08-13 12:00 |
13:21:01.67 |
-01:17:44.8 |
HIP 65083 |
23.54 |
| 2026-08-14 00:00 |
13:21:17.32 |
-01:19:51.7 |
HIP 65083 |
23.54 |
| 2026-08-14 12:00 |
13:21:33.09 |
-01:21:59.0 |
HIP 65083 |
24.38 |
| 2026-08-15 00:00 |
13:21:48.97 |
-01:24:06.7 |
HIP 65083 |
26.00 |
| 2026-08-15 12:00 |
13:22:04.96 |
-01:26:14.7 |
HIP 65083 |
28.27 |
| 2026-08-16 00:00 |
13:22:21.06 |
-01:28:23.2 |
HIP 65083 |
31.06 |
| 2026-08-16 12:00 |
13:22:37.27 |
-01:30:32.0 |
HIP 65083 |
34.26 |
| 2026-08-17 00:00 |
13:22:53.58 |
-01:32:41.1 |
HIP 65083 |
37.77 |
| 2026-08-17 12:00 |
13:23:10.01 |
-01:34:50.6 |
HIP 65397 |
35.35 |
| 2026-08-18 00:00 |
13:23:26.55 |
-01:37:00.5 |
HIP 65397 |
31.69 |
| 2026-08-18 12:00 |
13:23:43.18 |
-01:39:10.7 |
HIP 65397 |
28.32 |
| 2026-08-19 00:00 |
13:23:59.93 |
-01:41:21.2 |
HIP 65397 |
25.35 |