| 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 |
+8.4098 |
-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) |
| 2026-03-26 00:00 |
01:22:49.82 |
+09:00:33.0 |
HIP 6462 |
11.50 |
| 2026-03-26 12:00 |
01:23:15.48 |
+09:03:12.6 |
HIP 6462 |
8.34 |
| 2026-03-27 00:00 |
01:23:41.19 |
+09:05:52.3 |
HIP 6462 |
10.06 |
| 2026-03-27 12:00 |
01:24:06.92 |
+09:08:32.0 |
HIP 6462 |
15.09 |
| 2026-03-28 00:00 |
01:24:32.69 |
+09:11:11.8 |
HIP 6462 |
21.20 |
| 2026-03-28 12:00 |
01:24:58.50 |
+09:13:51.7 |
HIP 6462 |
27.69 |
| 2026-03-29 00:00 |
01:25:24.34 |
+09:16:31.6 |
HIP 6720 |
22.09 |
| 2026-03-29 12:00 |
01:25:50.21 |
+09:19:11.6 |
HIP 6720 |
15.85 |
| 2026-03-30 00:00 |
01:26:16.11 |
+09:21:51.6 |
HIP 6720 |
10.48 |
| 2026-03-30 12:00 |
01:26:42.05 |
+09:24:31.6 |
HIP 6720 |
8.03 |
| 2026-03-31 00:00 |
01:27:08.01 |
+09:27:11.7 |
HIP 6720 |
10.74 |
| 2026-03-31 12:00 |
01:27:34.01 |
+09:29:51.8 |
HIP 6720 |
16.20 |
| 2026-04-01 00:00 |
01:28:00.04 |
+09:32:32.0 |
HIP 6818 |
20.77 |
| 2026-04-01 12:00 |
01:28:26.10 |
+09:35:12.2 |
HIP 6818 |
20.64 |
| 2026-04-02 00:00 |
01:28:52.18 |
+09:37:52.3 |
HIP 6818 |
22.76 |
| 2026-04-02 12:00 |
01:29:18.30 |
+09:40:32.5 |
HIP 7041 |
22.23 |
| 2026-04-03 00:00 |
01:29:44.44 |
+09:43:12.8 |
HIP 7041 |
15.41 |
| 2026-04-03 12:00 |
01:30:10.61 |
+09:45:53.0 |
HIP 7041 |
8.83 |
| 2026-04-04 00:00 |
01:30:36.81 |
+09:48:33.2 |
HIP 7041 |
3.98 |
| 2026-04-04 12:00 |
01:31:03.04 |
+09:51:13.5 |
HIP 7041 |
7.17 |
| 2026-04-05 00:00 |
01:31:29.29 |
+09:53:53.7 |
HIP 7131 |
8.00 |
| 2026-04-05 12:00 |
01:31:55.56 |
+09:56:33.9 |
HIP 7131 |
2.79 |
| 2026-04-06 00:00 |
01:32:21.87 |
+09:59:14.2 |
HIP 7131 |
7.05 |
| 2026-04-06 12:00 |
01:32:48.19 |
+10:01:54.4 |
HIP 7131 |
13.78 |
| 2026-04-07 00:00 |
01:33:14.55 |
+10:04:34.6 |
HIP 7131 |
20.70 |
| 2026-04-07 12:00 |
01:33:40.92 |
+10:07:14.7 |
HIP 7392 |
25.92 |
| 2026-04-08 00:00 |
01:34:07.32 |
+10:09:54.9 |
HIP 7392 |
18.89 |
| 2026-04-08 12:00 |
01:34:33.74 |
+10:12:35.0 |
HIP 7392 |
11.87 |
| 2026-04-09 00:00 |
01:35:00.18 |
+10:15:15.1 |
HIP 7392 |
4.85 |
| 2026-04-09 12:00 |
01:35:26.65 |
+10:17:55.1 |
HIP 7392 |
2.24 |
| 2026-04-10 00:00 |
01:35:53.14 |
+10:20:35.1 |
HIP 7392 |
9.25 |
| 2026-04-10 12:00 |
01:36:19.64 |
+10:23:15.1 |
HIP 7411 |
15.45 |
| 2026-04-11 00:00 |
01:36:46.17 |
+10:25:55.0 |
HIP 7411 |
19.52 |
| 2026-04-11 12:00 |
01:37:12.72 |
+10:28:34.9 |
HIP 7620 |
20.24 |
| 2026-04-12 00:00 |
01:37:39.28 |
+10:31:14.7 |
HIP 7620 |
14.14 |
| 2026-04-12 12:00 |
01:38:05.87 |
+10:33:54.5 |
HIP 7620 |
9.46 |
| 2026-04-13 00:00 |
01:38:32.47 |
+10:36:34.1 |
HIP 7620 |
8.87 |
| 2026-04-13 12:00 |
01:38:59.09 |
+10:39:13.8 |
HIP 7620 |
12.94 |
| 2026-04-14 00:00 |
01:39:25.72 |
+10:41:53.3 |
HIP 7620 |
18.87 |
| 2026-04-14 12:00 |
01:39:52.37 |
+10:44:32.8 |
HIP 7620 |
25.39 |
| 2026-04-15 00:00 |
01:40:19.04 |
+10:47:12.2 |
HIP 7849 |
31.25 |
| 2026-04-15 12:00 |
01:40:45.72 |
+10:49:51.5 |
HIP 7849 |
27.45 |
| 2026-04-16 00:00 |
01:41:12.42 |
+10:52:30.7 |
HIP 7849 |
25.11 |