358P/PANSTARRS
| 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 |
0.999 |
| 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) |
| 2026-02-03 00:00 |
13:17:18.17 |
+05:47:04.0 |
HIP 64795 |
11.06 |
| 2026-02-03 12:00 |
13:17:18.88 |
+05:48:37.6 |
HIP 64795 |
10.05 |
| 2026-02-04 00:00 |
13:17:19.32 |
+05:50:12.7 |
HIP 64795 |
9.12 |
| 2026-02-04 12:00 |
13:17:19.49 |
+05:51:49.3 |
HIP 64795 |
8.31 |
| 2026-02-05 00:00 |
13:17:19.39 |
+05:53:27.3 |
HIP 64795 |
7.70 |
| 2026-02-05 12:00 |
13:17:19.03 |
+05:55:06.8 |
HIP 64795 |
7.33 |
| 2026-02-06 00:00 |
13:17:18.39 |
+05:56:47.7 |
HIP 64795 |
7.26 |
| 2026-02-06 12:00 |
13:17:17.48 |
+05:58:30.1 |
HIP 64795 |
7.53 |
| 2026-02-07 00:00 |
13:17:16.30 |
+06:00:14.0 |
HIP 64795 |
8.12 |
| 2026-02-07 12:00 |
13:17:14.85 |
+06:01:59.2 |
HIP 64795 |
8.99 |
| 2026-02-08 00:00 |
13:17:13.13 |
+06:03:45.9 |
HIP 64795 |
10.08 |
| 2026-02-08 12:00 |
13:17:11.13 |
+06:05:34.0 |
HIP 64795 |
11.36 |
| 2026-02-09 00:00 |
13:17:08.86 |
+06:07:23.4 |
HIP 64795 |
12.77 |
| 2026-02-09 12:00 |
13:17:06.32 |
+06:09:14.3 |
HIP 64795 |
14.30 |
| 2026-02-10 00:00 |
13:17:03.50 |
+06:11:06.5 |
HIP 64795 |
15.94 |
| 2026-02-10 12:00 |
13:17:00.41 |
+06:13:00.0 |
HIP 64795 |
17.66 |
| 2026-02-11 00:00 |
13:16:57.05 |
+06:14:54.9 |
HIP 64768 |
17.43 |
| 2026-02-11 12:00 |
13:16:53.41 |
+06:16:51.1 |
HIP 64768 |
15.30 |
| 2026-02-12 00:00 |
13:16:49.50 |
+06:18:48.6 |
HIP 64768 |
13.11 |
| 2026-02-12 12:00 |
13:16:45.32 |
+06:20:47.4 |
HIP 64768 |
10.88 |
| 2026-02-13 00:00 |
13:16:40.86 |
+06:22:47.5 |
HIP 64768 |
8.59 |
| 2026-02-13 12:00 |
13:16:36.12 |
+06:24:48.8 |
HIP 64768 |
6.25 |
| 2026-02-14 00:00 |
13:16:31.12 |
+06:26:51.4 |
HIP 64768 |
3.86 |
| 2026-02-14 12:00 |
13:16:25.84 |
+06:28:55.1 |
HIP 64768 |
1.44 |
| 2026-02-15 00:00 |
13:16:20.29 |
+06:31:00.1 |
HIP 64768 |
1.16 |
| 2026-02-15 12:00 |
13:16:14.46 |
+06:33:06.3 |
HIP 64768 |
3.67 |
| 2026-02-16 00:00 |
13:16:08.36 |
+06:35:13.6 |
HIP 64768 |
6.28 |
| 2026-02-16 12:00 |
13:16:01.99 |
+06:37:22.1 |
HIP 64768 |
8.94 |
| 2026-02-17 00:00 |
13:15:55.35 |
+06:39:31.7 |
HIP 64768 |
11.65 |
| 2026-02-17 12:00 |
13:15:48.44 |
+06:41:42.3 |
HIP 64768 |
14.43 |
| 2026-02-18 00:00 |
13:15:41.26 |
+06:43:54.1 |
HIP 64768 |
17.26 |
| 2026-02-18 12:00 |
13:15:33.81 |
+06:46:06.9 |
HIP 64768 |
20.14 |
| 2026-02-19 00:00 |
13:15:26.10 |
+06:48:20.8 |
HIP 64768 |
23.08 |
| 2026-02-19 12:00 |
13:15:18.11 |
+06:50:35.7 |
HIP 64768 |
26.07 |
| 2026-02-20 00:00 |
13:15:09.86 |
+06:52:51.5 |
HIP 64768 |
29.12 |
| 2026-02-20 12:00 |
13:15:01.34 |
+06:55:08.4 |
HIP 64768 |
32.22 |
| 2026-02-21 00:00 |
13:14:52.56 |
+06:57:26.1 |
HIP 64675 |
32.92 |
| 2026-02-21 12:00 |
13:14:43.52 |
+06:59:44.8 |
HIP 64675 |
31.28 |
| 2026-02-22 00:00 |
13:14:34.22 |
+07:02:04.4 |
HIP 64675 |
29.90 |
| 2026-02-22 12:00 |
13:14:24.66 |
+07:04:24.8 |
HIP 64675 |
28.85 |
| 2026-02-23 00:00 |
13:14:14.83 |
+07:06:46.1 |
HIP 64675 |
28.18 |
| 2026-02-23 12:00 |
13:14:04.75 |
+07:09:08.2 |
HIP 64675 |
27.95 |
| 2026-02-24 00:00 |
13:13:54.42 |
+07:11:31.1 |
HIP 64675 |
28.17 |