| Parameter |
Value |
| Designation |
356P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-12-17T00:38:21.903360Z |
| Orbit solution date (soln_date, UTC) |
2026-08-13T11:42:22Z |
| Obs used |
220 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
25.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-07-21.0000000 |
| e |
0.35413268 |
| q (au) |
2.689567 |
| a (au) |
4.164271 |
| i (deg) |
9.629230 |
| Ω (om, deg) |
160.803355 |
| ω (w, deg) |
226.153472 |
| M (ma, deg) |
25.049310 |
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) |
| 2026-09-20 00:00 |
04:54:13.88 |
+11:44:57.7 |
HIP 22831 |
13.25 |
| 2026-09-20 12:00 |
04:54:34.09 |
+11:43:23.1 |
HIP 22875 |
9.99 |
| 2026-09-21 00:00 |
04:54:53.99 |
+11:41:47.6 |
HIP 22875 |
6.04 |
| 2026-09-21 12:00 |
04:55:13.57 |
+11:40:11.1 |
HIP 22875 |
5.10 |
| 2026-09-22 00:00 |
04:55:32.83 |
+11:38:33.8 |
HIP 22875 |
8.12 |
| 2026-09-22 12:00 |
04:55:51.76 |
+11:36:55.5 |
HIP 22875 |
12.43 |
| 2026-09-23 00:00 |
04:56:10.37 |
+11:35:16.4 |
HIP 22875 |
17.02 |
| 2026-09-23 12:00 |
04:56:28.66 |
+11:33:36.4 |
HIP 23045 |
13.79 |
| 2026-09-24 00:00 |
04:56:46.62 |
+11:31:55.5 |
HIP 23045 |
9.15 |
| 2026-09-24 12:00 |
04:57:04.24 |
+11:30:13.7 |
HIP 23045 |
4.75 |
| 2026-09-25 00:00 |
04:57:21.54 |
+11:28:31.2 |
HIP 23045 |
2.13 |
| 2026-09-25 12:00 |
04:57:38.51 |
+11:26:47.7 |
HIP 23045 |
5.27 |
| 2026-09-26 00:00 |
04:57:55.14 |
+11:25:03.5 |
HIP 23045 |
9.51 |
| 2026-09-26 12:00 |
04:58:11.43 |
+11:23:18.5 |
HIP 23045 |
13.80 |
| 2026-09-27 00:00 |
04:58:27.39 |
+11:21:32.6 |
HIP 23045 |
18.07 |
| 2026-09-27 12:00 |
04:58:43.00 |
+11:19:46.0 |
HIP 23045 |
22.27 |
| 2026-09-28 00:00 |
04:58:58.28 |
+11:17:58.6 |
HIP 23045 |
26.42 |
| 2026-09-28 12:00 |
04:59:13.21 |
+11:16:10.4 |
HIP 23045 |
30.49 |
| 2026-09-29 00:00 |
04:59:27.80 |
+11:14:21.5 |
HIP 23303 |
26.82 |
| 2026-09-29 12:00 |
04:59:42.05 |
+11:12:31.9 |
HIP 23303 |
23.13 |
| 2026-09-30 00:00 |
04:59:55.94 |
+11:10:41.5 |
HIP 23303 |
19.58 |
| 2026-09-30 12:00 |
05:00:09.48 |
+11:08:50.4 |
HIP 23303 |
16.22 |
| 2026-10-01 00:00 |
05:00:22.68 |
+11:06:58.6 |
HIP 23303 |
13.12 |
| 2026-10-01 12:00 |
05:00:35.52 |
+11:05:06.1 |
HIP 23303 |
10.44 |
| 2026-10-02 00:00 |
05:00:48.00 |
+11:03:13.0 |
HIP 23303 |
8.51 |
| 2026-10-02 12:00 |
05:01:00.13 |
+11:01:19.2 |
HIP 23303 |
7.80 |
| 2026-10-03 00:00 |
05:01:11.89 |
+10:59:24.7 |
HIP 23303 |
8.53 |
| 2026-10-03 12:00 |
05:01:23.30 |
+10:57:29.6 |
HIP 23303 |
10.34 |
| 2026-10-04 00:00 |
05:01:34.35 |
+10:55:33.9 |
HIP 23303 |
12.72 |
| 2026-10-04 12:00 |
05:01:45.03 |
+10:53:37.7 |
HIP 23303 |
15.36 |
| 2026-10-05 00:00 |
05:01:55.34 |
+10:51:40.8 |
HIP 23485 |
15.00 |
| 2026-10-05 12:00 |
05:02:05.29 |
+10:49:43.3 |
HIP 23485 |
13.68 |
| 2026-10-06 00:00 |
05:02:14.87 |
+10:47:45.4 |
HIP 23485 |
13.06 |
| 2026-10-06 12:00 |
05:02:24.08 |
+10:45:46.8 |
HIP 23485 |
13.20 |
| 2026-10-07 00:00 |
05:02:32.92 |
+10:43:47.8 |
HIP 23485 |
14.04 |
| 2026-10-07 12:00 |
05:02:41.39 |
+10:41:48.3 |
HIP 23485 |
15.42 |
| 2026-10-08 00:00 |
05:02:49.49 |
+10:39:48.3 |
HIP 23485 |
17.20 |
| 2026-10-08 12:00 |
05:02:57.21 |
+10:37:47.8 |
HIP 23544 |
18.26 |
| 2026-10-09 00:00 |
05:03:04.56 |
+10:35:46.9 |
HIP 23544 |
18.73 |
| 2026-10-09 12:00 |
05:03:11.53 |
+10:33:45.6 |
HIP 23544 |
19.62 |
| 2026-10-10 00:00 |
05:03:18.12 |
+10:31:43.9 |
HIP 23544 |
20.84 |
| 2026-10-10 12:00 |
05:03:24.34 |
+10:29:41.8 |
HIP 23544 |
22.34 |
| 2026-10-11 00:00 |
05:03:30.18 |
+10:27:39.3 |
HIP 23599 |
21.53 |