| Parameter |
Value |
| Designation |
356P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-12-17T02:14:08.306880Z |
| Orbit solution date (soln_date, UTC) |
2025-09-16T12:43:07Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
25.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-02-13.0000000 |
| e |
0.35414993 |
| q (au) |
2.689674 |
| a (au) |
4.164548 |
| i (deg) |
9.629239 |
| Ω (om, deg) |
160.807857 |
| ω (w, deg) |
226.167708 |
| M (ma, deg) |
6.715560 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.412 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.412 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.913 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-03-26 00:00 |
00:26:51.11 |
-00:26:39.3 |
HIP 2100 |
23.93 |
| 2026-03-26 12:00 |
00:27:41.95 |
-00:22:04.4 |
HIP 2100 |
25.01 |
| 2026-03-27 00:00 |
00:28:32.81 |
-00:17:29.7 |
HIP 2333 |
19.61 |
| 2026-03-27 12:00 |
00:29:23.68 |
-00:12:55.1 |
HIP 2333 |
9.30 |
| 2026-03-28 00:00 |
00:30:14.57 |
-00:08:20.6 |
HIP 2333 |
12.41 |
| 2026-03-28 12:00 |
00:31:05.47 |
-00:03:46.3 |
HIP 2333 |
24.23 |
| 2026-03-29 00:00 |
00:31:56.39 |
+00:00:47.9 |
HIP 2585 |
30.57 |
| 2026-03-29 12:00 |
00:32:47.33 |
+00:05:21.9 |
HIP 2585 |
32.11 |
| 2026-03-30 00:00 |
00:33:38.28 |
+00:09:55.8 |
HIP 2585 |
38.64 |
| 2026-03-30 12:00 |
00:34:29.24 |
+00:14:29.6 |
HIP 2706 |
45.69 |
| 2026-03-31 00:00 |
00:35:20.22 |
+00:19:03.1 |
HIP 2982 |
39.89 |
| 2026-03-31 12:00 |
00:36:11.22 |
+00:23:36.5 |
HIP 2982 |
26.62 |
| 2026-04-01 00:00 |
00:37:02.23 |
+00:28:09.7 |
HIP 2982 |
13.87 |
| 2026-04-01 12:00 |
00:37:53.26 |
+00:32:42.7 |
HIP 2982 |
6.52 |
| 2026-04-02 00:00 |
00:38:44.30 |
+00:37:15.5 |
HIP 2982 |
16.12 |
| 2026-04-02 12:00 |
00:39:35.35 |
+00:41:48.1 |
HIP 3055 |
19.08 |
| 2026-04-03 00:00 |
00:40:26.42 |
+00:46:20.5 |
HIP 3055 |
26.69 |
| 2026-04-03 12:00 |
00:41:17.51 |
+00:50:52.6 |
HIP 3296 |
15.37 |
| 2026-04-04 00:00 |
00:42:08.61 |
+00:55:24.6 |
HIP 3296 |
6.22 |
| 2026-04-04 12:00 |
00:42:59.72 |
+00:59:56.3 |
HIP 3302 |
13.80 |
| 2026-04-05 00:00 |
00:43:50.85 |
+01:04:27.7 |
HIP 3302 |
26.03 |
| 2026-04-05 12:00 |
00:44:41.99 |
+01:08:59.0 |
HIP 3481 |
37.66 |
| 2026-04-06 00:00 |
00:45:33.15 |
+01:13:29.9 |
HIP 3655 |
26.68 |
| 2026-04-06 12:00 |
00:46:24.32 |
+01:18:00.6 |
HIP 3655 |
15.74 |
| 2026-04-07 00:00 |
00:47:15.51 |
+01:22:31.1 |
HIP 3655 |
12.31 |
| 2026-04-07 12:00 |
00:48:06.71 |
+01:27:01.2 |
HIP 3655 |
20.58 |
| 2026-04-08 00:00 |
00:48:57.92 |
+01:31:31.1 |
HIP 3793 |
30.91 |
| 2026-04-08 12:00 |
00:49:49.15 |
+01:36:00.7 |
HIP 3793 |
38.78 |
| 2026-04-09 00:00 |
00:50:40.39 |
+01:40:30.0 |
HIP 4203 |
46.74 |
| 2026-04-09 12:00 |
00:51:31.64 |
+01:44:58.9 |
HIP 4203 |
33.18 |
| 2026-04-10 00:00 |
00:52:22.91 |
+01:49:27.6 |
HIP 4203 |
19.63 |
| 2026-04-10 12:00 |
00:53:14.19 |
+01:53:55.9 |
HIP 4203 |
6.17 |
| 2026-04-11 00:00 |
00:54:05.49 |
+01:58:23.9 |
HIP 4203 |
7.70 |
| 2026-04-11 12:00 |
00:54:56.79 |
+02:02:51.6 |
HIP 4203 |
21.19 |
| 2026-04-12 00:00 |
00:55:48.11 |
+02:07:18.9 |
HIP 4504 |
28.55 |
| 2026-04-12 12:00 |
00:56:39.44 |
+02:11:45.8 |
HIP 4504 |
16.83 |
| 2026-04-13 00:00 |
00:57:30.78 |
+02:16:12.4 |
HIP 4504 |
10.96 |
| 2026-04-13 12:00 |
00:58:22.14 |
+02:20:38.7 |
HIP 4529 |
10.30 |
| 2026-04-14 00:00 |
00:59:13.50 |
+02:25:04.5 |
HIP 4564 |
16.54 |
| 2026-04-14 12:00 |
01:00:04.88 |
+02:29:29.9 |
HIP 4677 |
8.48 |
| 2026-04-15 00:00 |
01:00:56.27 |
+02:33:55.0 |
HIP 4738 |
1.76 |
| 2026-04-15 12:00 |
01:01:47.67 |
+02:38:19.6 |
HIP 4825 |
7.40 |
| 2026-04-16 00:00 |
01:02:39.08 |
+02:42:43.9 |
HIP 4825 |
14.90 |