| Parameter |
Value |
| Designation |
358P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-11-11T04:28:15.360960Z |
| Orbit solution date (soln_date, UTC) |
2024-03-05T09:31:37Z |
| Obs used |
252 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
30.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-08-02.0000000 |
| e |
0.23889221 |
| q (au) |
2.394903 |
| a (au) |
3.146602 |
| i (deg) |
11.060250 |
| Ω (om, deg) |
85.702465 |
| ω (w, deg) |
299.772862 |
| M (ma, deg) |
277.680859 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.358 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.358 |
| n |
6.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
13:37:53.50 |
-02:06:35.2 |
HIP 66499 |
1.23 |
| 2026-09-25 12:00 |
13:38:24.15 |
-02:10:10.0 |
HIP 66499 |
9.10 |
| 2026-09-26 00:00 |
13:38:54.85 |
-02:13:44.6 |
HIP 66499 |
17.53 |
| 2026-09-26 12:00 |
13:39:25.59 |
-02:17:19.0 |
HIP 66686 |
12.88 |
| 2026-09-27 00:00 |
13:39:56.38 |
-02:20:53.2 |
HIP 66686 |
4.42 |
| 2026-09-27 12:00 |
13:40:27.23 |
-02:24:27.2 |
HIP 66686 |
4.12 |
| 2026-09-28 00:00 |
13:40:58.11 |
-02:28:01.0 |
HIP 66686 |
12.60 |
| 2026-09-28 12:00 |
13:41:29.05 |
-02:31:34.5 |
HIP 66686 |
21.11 |
| 2026-09-29 00:00 |
13:42:00.03 |
-02:35:07.9 |
HIP 66922 |
15.27 |
| 2026-09-29 12:00 |
13:42:31.06 |
-02:38:40.9 |
HIP 66922 |
12.07 |
| 2026-09-30 00:00 |
13:43:02.13 |
-02:42:13.8 |
HIP 66922 |
14.26 |
| 2026-09-30 12:00 |
13:43:33.25 |
-02:45:46.4 |
HIP 66922 |
20.17 |
| 2026-10-01 00:00 |
13:44:04.42 |
-02:49:18.8 |
HIP 66922 |
27.50 |
| 2026-10-01 12:00 |
13:44:35.63 |
-02:52:50.9 |
HIP 67099 |
27.47 |
| 2026-10-02 00:00 |
13:45:06.88 |
-02:56:22.8 |
HIP 67099 |
22.55 |
| 2026-10-02 12:00 |
13:45:38.18 |
-02:59:54.4 |
HIP 67099 |
20.22 |
| 2026-10-03 00:00 |
13:46:09.52 |
-03:03:25.8 |
HIP 67099 |
21.38 |
| 2026-10-03 12:00 |
13:46:40.90 |
-03:06:56.9 |
HIP 67099 |
25.55 |
| 2026-10-04 00:00 |
13:47:12.33 |
-03:10:27.8 |
HIP 67385 |
29.46 |
| 2026-10-04 12:00 |
13:47:43.80 |
-03:13:58.4 |
HIP 67387 |
23.83 |
| 2026-10-05 00:00 |
13:48:15.31 |
-03:17:28.7 |
HIP 67387 |
16.94 |
| 2026-10-05 12:00 |
13:48:46.86 |
-03:20:58.7 |
HIP 67387 |
12.42 |
| 2026-10-06 00:00 |
13:49:18.45 |
-03:24:28.5 |
HIP 67387 |
13.05 |
| 2026-10-06 12:00 |
13:49:50.09 |
-03:27:57.9 |
HIP 67387 |
18.32 |
| 2026-10-07 00:00 |
13:50:21.76 |
-03:31:27.1 |
HIP 67387 |
25.50 |
| 2026-10-07 12:00 |
13:50:53.47 |
-03:34:56.0 |
HIP 67387 |
33.39 |
| 2026-10-08 00:00 |
13:51:25.22 |
-03:38:24.6 |
HIP 67785 |
27.31 |
| 2026-10-08 12:00 |
13:51:57.01 |
-03:41:52.8 |
HIP 67785 |
20.94 |
| 2026-10-09 00:00 |
13:52:28.83 |
-03:45:20.8 |
HIP 67785 |
16.76 |
| 2026-10-09 12:00 |
13:53:00.70 |
-03:48:48.4 |
HIP 67785 |
16.53 |
| 2026-10-10 00:00 |
13:53:32.59 |
-03:52:15.7 |
HIP 67785 |
20.39 |
| 2026-10-10 12:00 |
13:54:04.53 |
-03:55:42.7 |
HIP 67785 |
26.62 |
| 2026-10-11 00:00 |
13:54:36.50 |
-03:59:09.4 |
HIP 67991 |
26.15 |
| 2026-10-11 12:00 |
13:55:08.50 |
-04:02:35.7 |
HIP 67991 |
20.17 |
| 2026-10-12 00:00 |
13:55:40.54 |
-04:06:01.7 |
HIP 67991 |
16.76 |
| 2026-10-12 12:00 |
13:56:12.61 |
-04:09:27.3 |
HIP 67991 |
17.50 |
| 2026-10-13 00:00 |
13:56:44.71 |
-04:12:52.6 |
HIP 68221 |
21.06 |
| 2026-10-13 12:00 |
13:57:16.84 |
-04:16:17.5 |
HIP 68221 |
12.43 |
| 2026-10-14 00:00 |
13:57:49.01 |
-04:19:42.1 |
HIP 68221 |
4.18 |
| 2026-10-14 12:00 |
13:58:21.21 |
-04:23:06.3 |
HIP 68221 |
5.69 |
| 2026-10-15 00:00 |
13:58:53.43 |
-04:26:30.1 |
HIP 68221 |
14.12 |
| 2026-10-15 12:00 |
13:59:25.69 |
-04:29:53.6 |
HIP 68221 |
22.77 |
| 2026-10-16 00:00 |
13:59:57.98 |
-04:33:16.7 |
HIP 68221 |
31.47 |