| Parameter |
Value |
| Designation |
356P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-12-17T01:18:02.404800Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:35Z |
| Obs used |
220 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
26.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-05-26.0000000 |
| e |
0.35414402 |
| q (au) |
2.689612 |
| a (au) |
4.164414 |
| i (deg) |
9.629137 |
| Ω (om, deg) |
160.805393 |
| ω (w, deg) |
226.159766 |
| M (ma, deg) |
18.550090 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.411 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.411 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.913 |
| 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) |
| 2026-07-29 00:00 |
03:54:53.31 |
+12:37:51.9 |
HIP 18322 |
8.95 |
| 2026-07-29 12:00 |
03:55:36.64 |
+12:38:33.9 |
HIP 18322 |
12.77 |
| 2026-07-30 00:00 |
03:56:19.84 |
+12:39:14.4 |
HIP 18322 |
21.65 |
| 2026-07-30 12:00 |
03:57:02.91 |
+12:39:53.5 |
HIP 18549 |
16.73 |
| 2026-07-31 00:00 |
03:57:45.85 |
+12:40:31.1 |
HIP 18549 |
7.57 |
| 2026-07-31 12:00 |
03:58:28.66 |
+12:41:07.4 |
HIP 18549 |
7.39 |
| 2026-08-01 00:00 |
03:59:11.34 |
+12:41:42.1 |
HIP 18549 |
16.43 |
| 2026-08-01 12:00 |
03:59:53.88 |
+12:42:15.5 |
HIP 18724 |
17.20 |
| 2026-08-02 00:00 |
04:00:36.29 |
+12:42:47.4 |
HIP 18724 |
13.41 |
| 2026-08-02 12:00 |
04:01:18.55 |
+12:43:17.9 |
HIP 18724 |
16.65 |
| 2026-08-03 00:00 |
04:02:00.68 |
+12:43:46.9 |
HIP 18724 |
24.20 |
| 2026-08-03 12:00 |
04:02:42.67 |
+12:44:14.5 |
HIP 18937 |
15.44 |
| 2026-08-04 00:00 |
04:03:24.51 |
+12:44:40.7 |
HIP 18937 |
9.43 |
| 2026-08-04 12:00 |
04:04:06.22 |
+12:45:05.4 |
HIP 18937 |
12.16 |
| 2026-08-05 00:00 |
04:04:47.77 |
+12:45:28.7 |
HIP 19003 |
16.61 |
| 2026-08-05 12:00 |
04:05:29.18 |
+12:45:50.5 |
HIP 19003 |
23.07 |
| 2026-08-06 00:00 |
04:06:10.44 |
+12:46:10.9 |
HIP 19180 |
24.38 |
| 2026-08-06 12:00 |
04:06:51.55 |
+12:46:29.9 |
HIP 19180 |
23.10 |
| 2026-08-07 00:00 |
04:07:32.51 |
+12:46:47.4 |
HIP 19180 |
25.95 |
| 2026-08-07 12:00 |
04:08:13.31 |
+12:47:03.5 |
HIP 19325 |
27.07 |
| 2026-08-08 00:00 |
04:08:53.96 |
+12:47:18.1 |
HIP 19325 |
27.56 |
| 2026-08-08 12:00 |
04:09:34.45 |
+12:47:31.3 |
HIP 19325 |
31.32 |
| 2026-08-09 00:00 |
04:10:14.78 |
+12:47:43.1 |
HIP 19325 |
37.34 |
| 2026-08-09 12:00 |
04:10:54.95 |
+12:47:53.5 |
HIP 19649 |
32.37 |
| 2026-08-10 00:00 |
04:11:34.96 |
+12:48:02.4 |
HIP 19649 |
25.70 |
| 2026-08-10 12:00 |
04:12:14.80 |
+12:48:09.8 |
HIP 19649 |
21.52 |
| 2026-08-11 00:00 |
04:12:54.47 |
+12:48:15.9 |
HIP 19736 |
13.83 |
| 2026-08-11 12:00 |
04:13:33.98 |
+12:48:20.5 |
HIP 19736 |
4.97 |
| 2026-08-12 00:00 |
04:14:13.31 |
+12:48:23.7 |
HIP 19736 |
6.54 |
| 2026-08-12 12:00 |
04:14:52.47 |
+12:48:25.4 |
HIP 19808 |
14.88 |
| 2026-08-13 00:00 |
04:15:31.46 |
+12:48:25.8 |
HIP 19808 |
17.73 |
| 2026-08-13 12:00 |
04:16:10.28 |
+12:48:24.7 |
HIP 19808 |
24.22 |
| 2026-08-14 00:00 |
04:16:48.91 |
+12:48:22.2 |
HIP 20098 |
28.88 |
| 2026-08-14 12:00 |
04:17:27.37 |
+12:48:18.3 |
HIP 20098 |
21.22 |
| 2026-08-15 00:00 |
04:18:05.64 |
+12:48:13.0 |
HIP 20098 |
15.57 |
| 2026-08-15 12:00 |
04:18:43.74 |
+12:48:06.3 |
HIP 20098 |
14.41 |
| 2026-08-16 00:00 |
04:19:21.65 |
+12:47:58.2 |
HIP 20187 |
11.14 |
| 2026-08-16 12:00 |
04:19:59.37 |
+12:47:48.7 |
HIP 20187 |
11.72 |
| 2026-08-17 00:00 |
04:20:36.91 |
+12:47:37.8 |
HIP 20187 |
17.84 |
| 2026-08-17 12:00 |
04:21:14.25 |
+12:47:25.5 |
HIP 20397 |
20.37 |
| 2026-08-18 00:00 |
04:21:51.41 |
+12:47:11.8 |
HIP 20397 |
16.82 |
| 2026-08-18 12:00 |
04:22:28.37 |
+12:46:56.7 |
HIP 20397 |
17.72 |
| 2026-08-19 00:00 |
04:23:05.15 |
+12:46:40.3 |
HIP 20540 |
18.59 |