| Parameter |
Value |
| Designation |
116P/Wild 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-01-11T12:37:31.860480Z |
| Orbit solution date (soln_date, UTC) |
2024-09-13T12:15:05Z |
| Obs used |
4667 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
17.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-04-16.0000000 |
| e |
0.37227703 |
| q (au) |
2.187086 |
| a (au) |
3.484158 |
| i (deg) |
3.607844 |
| Ω (om, deg) |
20.991856 |
| ω (w, deg) |
173.310727 |
| M (ma, deg) |
14.469123 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.718 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.718 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.870 |
| k |
0.999 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-12-05 |
2024-09-04 |
+8.4097 |
-3.455 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:11:46.48 |
+19:18:10.6 |
HIP 14929 |
24.19 |
| 2026-09-20 12:00 |
03:11:39.65 |
+19:18:03.5 |
HIP 14929 |
24.86 |
| 2026-09-21 00:00 |
03:11:32.59 |
+19:17:55.5 |
HIP 14929 |
25.63 |
| 2026-09-21 12:00 |
03:11:25.28 |
+19:17:46.6 |
HIP 14838 |
25.99 |
| 2026-09-22 00:00 |
03:11:17.74 |
+19:17:36.7 |
HIP 14672 |
24.89 |
| 2026-09-22 12:00 |
03:11:09.96 |
+19:17:25.9 |
HIP 14672 |
23.14 |
| 2026-09-23 00:00 |
03:11:01.95 |
+19:17:14.2 |
HIP 14672 |
21.35 |
| 2026-09-23 12:00 |
03:10:53.71 |
+19:17:01.5 |
HIP 14672 |
19.55 |
| 2026-09-24 00:00 |
03:10:45.23 |
+19:16:47.9 |
HIP 14672 |
17.72 |
| 2026-09-24 12:00 |
03:10:36.51 |
+19:16:33.4 |
HIP 14672 |
15.90 |
| 2026-09-25 00:00 |
03:10:27.57 |
+19:16:17.9 |
HIP 14672 |
14.11 |
| 2026-09-25 12:00 |
03:10:18.39 |
+19:16:01.4 |
HIP 14672 |
12.38 |
| 2026-09-26 00:00 |
03:10:08.98 |
+19:15:44.0 |
HIP 14672 |
10.79 |
| 2026-09-26 12:00 |
03:09:59.33 |
+19:15:25.7 |
HIP 14672 |
9.44 |
| 2026-09-27 00:00 |
03:09:49.46 |
+19:15:06.4 |
HIP 14672 |
8.50 |
| 2026-09-27 12:00 |
03:09:39.36 |
+19:14:46.1 |
HIP 14672 |
8.15 |
| 2026-09-28 00:00 |
03:09:29.03 |
+19:14:24.9 |
HIP 14672 |
8.53 |
| 2026-09-28 12:00 |
03:09:18.47 |
+19:14:02.8 |
HIP 14672 |
9.59 |
| 2026-09-29 00:00 |
03:09:07.68 |
+19:13:39.6 |
HIP 14672 |
11.17 |
| 2026-09-29 12:00 |
03:08:56.66 |
+19:13:15.6 |
HIP 14672 |
13.12 |
| 2026-09-30 00:00 |
03:08:45.42 |
+19:12:50.5 |
HIP 14672 |
15.32 |
| 2026-09-30 12:00 |
03:08:33.96 |
+19:12:24.5 |
HIP 14672 |
17.71 |
| 2026-10-01 00:00 |
03:08:22.27 |
+19:11:57.6 |
HIP 14493 |
19.64 |
| 2026-10-01 12:00 |
03:08:10.35 |
+19:11:29.6 |
HIP 14493 |
17.54 |
| 2026-10-02 00:00 |
03:07:58.22 |
+19:11:00.8 |
HIP 14493 |
15.65 |
| 2026-10-02 12:00 |
03:07:45.86 |
+19:10:30.9 |
HIP 14493 |
14.10 |
| 2026-10-03 00:00 |
03:07:33.28 |
+19:10:00.1 |
HIP 14493 |
13.02 |
| 2026-10-03 12:00 |
03:07:20.49 |
+19:09:28.3 |
HIP 14493 |
12.60 |
| 2026-10-04 00:00 |
03:07:07.47 |
+19:08:55.6 |
HIP 14493 |
12.94 |
| 2026-10-04 12:00 |
03:06:54.25 |
+19:08:21.9 |
HIP 14493 |
14.01 |
| 2026-10-05 00:00 |
03:06:40.80 |
+19:07:47.3 |
HIP 14493 |
15.69 |
| 2026-10-05 12:00 |
03:06:27.15 |
+19:07:11.6 |
HIP 14493 |
17.85 |
| 2026-10-06 00:00 |
03:06:13.28 |
+19:06:35.1 |
HIP 14493 |
20.36 |
| 2026-10-06 12:00 |
03:05:59.20 |
+19:05:57.5 |
HIP 14493 |
23.12 |
| 2026-10-07 00:00 |
03:05:44.91 |
+19:05:19.1 |
HIP 14391 |
23.83 |
| 2026-10-07 12:00 |
03:05:30.42 |
+19:04:39.6 |
HIP 14391 |
23.24 |
| 2026-10-08 00:00 |
03:05:15.72 |
+19:03:59.2 |
HIP 14391 |
23.16 |
| 2026-10-08 12:00 |
03:05:00.82 |
+19:03:17.9 |
HIP 14391 |
23.63 |
| 2026-10-09 00:00 |
03:04:45.72 |
+19:02:35.6 |
HIP 14391 |
24.63 |
| 2026-10-09 12:00 |
03:04:30.43 |
+19:01:52.4 |
HIP 14391 |
26.12 |
| 2026-10-10 00:00 |
03:04:14.93 |
+19:01:08.3 |
HIP 14140 |
27.52 |
| 2026-10-10 12:00 |
03:03:59.24 |
+19:00:23.2 |
HIP 14140 |
23.99 |
| 2026-10-11 00:00 |
03:03:43.37 |
+18:59:37.2 |
HIP 14140 |
20.52 |