| Parameter |
Value |
| Designation |
351P/Wiegert-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-03-26T14:53:45.628800Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:43:05Z |
| Obs used |
315 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
18.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-08-22.0000000 |
| e |
0.29492996 |
| q (au) |
3.130422 |
| a (au) |
4.439874 |
| i (deg) |
12.776645 |
| Ω (om, deg) |
283.405061 |
| ω (w, deg) |
352.656240 |
| M (ma, deg) |
298.619005 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.665 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.665 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.503 |
| 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) |
| 2026-05-12 00:00 |
23:47:22.81 |
+09:40:33.8 |
HIP 117236 |
17.18 |
| 2026-05-12 12:00 |
23:47:50.14 |
+09:44:46.8 |
HIP 117461 |
18.34 |
| 2026-05-13 00:00 |
23:48:17.35 |
+09:48:59.5 |
HIP 117461 |
10.60 |
| 2026-05-13 12:00 |
23:48:44.46 |
+09:53:11.8 |
HIP 117461 |
3.74 |
| 2026-05-14 00:00 |
23:49:11.45 |
+09:57:23.8 |
HIP 117461 |
6.32 |
| 2026-05-14 12:00 |
23:49:38.34 |
+10:01:35.4 |
HIP 117468 |
13.36 |
| 2026-05-15 00:00 |
23:50:05.11 |
+10:05:46.6 |
HIP 117468 |
15.53 |
| 2026-05-15 12:00 |
23:50:31.78 |
+10:09:57.5 |
HIP 117468 |
20.60 |
| 2026-05-16 00:00 |
23:50:58.33 |
+10:14:08.0 |
HIP 117468 |
26.97 |
| 2026-05-16 12:00 |
23:51:24.77 |
+10:18:18.1 |
HIP 117468 |
33.88 |
| 2026-05-17 00:00 |
23:51:51.09 |
+10:22:27.8 |
HIP 117730 |
36.19 |
| 2026-05-17 12:00 |
23:52:17.30 |
+10:26:37.2 |
HIP 117730 |
30.61 |
| 2026-05-18 00:00 |
23:52:43.39 |
+10:30:46.1 |
HIP 117730 |
26.12 |
| 2026-05-18 12:00 |
23:53:09.36 |
+10:34:54.6 |
HIP 117730 |
23.32 |
| 2026-05-19 00:00 |
23:53:35.22 |
+10:39:02.7 |
HIP 117730 |
22.81 |
| 2026-05-19 12:00 |
23:54:00.95 |
+10:43:10.4 |
HIP 117909 |
21.94 |
| 2026-05-20 00:00 |
23:54:26.57 |
+10:47:17.7 |
HIP 117909 |
22.40 |
| 2026-05-20 12:00 |
23:54:52.07 |
+10:51:24.5 |
HIP 118019 |
22.21 |
| 2026-05-21 00:00 |
23:55:17.44 |
+10:55:31.0 |
HIP 118019 |
15.66 |
| 2026-05-21 12:00 |
23:55:42.70 |
+10:59:36.9 |
HIP 118019 |
10.45 |
| 2026-05-22 00:00 |
23:56:07.83 |
+11:03:42.5 |
HIP 118019 |
9.15 |
| 2026-05-22 12:00 |
23:56:32.84 |
+11:07:47.5 |
HIP 118019 |
12.94 |
| 2026-05-23 00:00 |
23:56:57.72 |
+11:11:52.2 |
HIP 118019 |
18.95 |
| 2026-05-23 12:00 |
23:57:22.49 |
+11:15:56.3 |
HIP 118133 |
13.81 |
| 2026-05-24 00:00 |
23:57:47.12 |
+11:20:00.1 |
HIP 118133 |
8.47 |
| 2026-05-24 12:00 |
23:58:11.63 |
+11:24:03.3 |
HIP 118133 |
7.63 |
| 2026-05-25 00:00 |
23:58:36.01 |
+11:28:06.1 |
HIP 118133 |
12.21 |
| 2026-05-25 12:00 |
23:59:00.27 |
+11:32:08.4 |
HIP 118318 |
14.99 |
| 2026-05-26 00:00 |
23:59:24.40 |
+11:36:10.2 |
HIP 118318 |
7.84 |
| 2026-05-26 12:00 |
23:59:48.40 |
+11:40:11.5 |
HIP 118318 |
0.75 |
| 2026-05-27 00:00 |
00:00:12.26 |
+11:44:12.4 |
HIP 118318 |
6.38 |
| 2026-05-27 12:00 |
00:00:36.00 |
+11:48:12.8 |
HIP 118318 |
13.43 |
| 2026-05-28 00:00 |
00:00:59.61 |
+11:52:12.6 |
HIP 118318 |
20.46 |
| 2026-05-28 12:00 |
00:01:23.09 |
+11:56:12.0 |
HIP 36 |
24.42 |
| 2026-05-29 00:00 |
00:01:46.43 |
+12:00:10.9 |
HIP 36 |
25.48 |
| 2026-05-29 12:00 |
00:02:09.64 |
+12:04:09.2 |
HIP 283 |
26.24 |
| 2026-05-30 00:00 |
00:02:32.72 |
+12:08:07.0 |
HIP 283 |
19.39 |
| 2026-05-30 12:00 |
00:02:55.66 |
+12:12:04.4 |
HIP 283 |
12.64 |
| 2026-05-31 00:00 |
00:03:18.47 |
+12:16:01.1 |
HIP 283 |
6.14 |
| 2026-05-31 12:00 |
00:03:41.13 |
+12:19:57.4 |
HIP 283 |
2.97 |
| 2026-06-01 00:00 |
00:04:03.67 |
+12:23:53.1 |
HIP 283 |
8.46 |
| 2026-06-01 12:00 |
00:04:26.06 |
+12:27:48.3 |
HIP 283 |
14.99 |
| 2026-06-02 00:00 |
00:04:48.31 |
+12:31:43.0 |
HIP 491 |
15.74 |