| Parameter |
Value |
| Designation |
C/2015 WZ (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-04-15T19:10:55.200000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:17Z |
| Obs used |
373 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
25.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-05-03.0000000 |
| e |
0.99287381 |
| q (au) |
1.376638 |
| a (au) |
193.179952 |
| i (deg) |
134.134938 |
| Ω (om, deg) |
40.045810 |
| ω (w, deg) |
66.710648 |
| M (ma, deg) |
0.006314 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.676 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.676 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-06-01 00:00 |
11:36:42.92 |
-28:12:53.7 |
HIP 56733 |
16.21 |
| 2026-06-01 12:00 |
11:36:41.41 |
-28:12:12.8 |
HIP 56733 |
16.66 |
| 2026-06-02 00:00 |
11:36:39.94 |
-28:11:32.2 |
HIP 56733 |
17.12 |
| 2026-06-02 12:00 |
11:36:38.51 |
-28:10:51.7 |
HIP 56733 |
17.59 |
| 2026-06-03 00:00 |
11:36:37.13 |
-28:10:11.4 |
HIP 56733 |
18.06 |
| 2026-06-03 12:00 |
11:36:35.79 |
-28:09:31.2 |
HIP 56733 |
18.55 |
| 2026-06-04 00:00 |
11:36:34.50 |
-28:08:51.3 |
HIP 56733 |
19.04 |
| 2026-06-04 12:00 |
11:36:33.24 |
-28:08:11.5 |
HIP 56733 |
19.53 |
| 2026-06-05 00:00 |
11:36:32.03 |
-28:07:31.8 |
HIP 56733 |
20.03 |
| 2026-06-05 12:00 |
11:36:30.86 |
-28:06:52.4 |
HIP 56733 |
20.53 |
| 2026-06-06 00:00 |
11:36:29.74 |
-28:06:13.1 |
HIP 56733 |
21.04 |
| 2026-06-06 12:00 |
11:36:28.65 |
-28:05:34.0 |
HIP 56733 |
21.54 |
| 2026-06-07 00:00 |
11:36:27.61 |
-28:04:55.2 |
HIP 56733 |
22.05 |
| 2026-06-07 12:00 |
11:36:26.62 |
-28:04:16.5 |
HIP 56733 |
22.55 |
| 2026-06-08 00:00 |
11:36:25.66 |
-28:03:38.0 |
HIP 56733 |
23.06 |
| 2026-06-08 12:00 |
11:36:24.75 |
-28:02:59.7 |
HIP 56733 |
23.56 |
| 2026-06-09 00:00 |
11:36:23.89 |
-28:02:21.6 |
HIP 56733 |
24.06 |
| 2026-06-09 12:00 |
11:36:23.06 |
-28:01:43.7 |
HIP 56733 |
24.56 |
| 2026-06-10 00:00 |
11:36:22.28 |
-28:01:06.0 |
HIP 56733 |
25.06 |
| 2026-06-10 12:00 |
11:36:21.54 |
-28:00:28.5 |
HIP 56733 |
25.55 |
| 2026-06-11 00:00 |
11:36:20.85 |
-27:59:51.2 |
HIP 56733 |
26.04 |
| 2026-06-11 12:00 |
11:36:20.19 |
-27:59:14.2 |
HIP 56733 |
26.53 |
| 2026-06-12 00:00 |
11:36:19.58 |
-27:58:37.3 |
HIP 56733 |
27.02 |
| 2026-06-12 12:00 |
11:36:19.01 |
-27:58:00.7 |
HIP 56733 |
27.50 |
| 2026-06-13 00:00 |
11:36:18.49 |
-27:57:24.3 |
HIP 56733 |
27.97 |
| 2026-06-13 12:00 |
11:36:18.01 |
-27:56:48.1 |
HIP 56733 |
28.44 |
| 2026-06-14 00:00 |
11:36:17.57 |
-27:56:12.2 |
HIP 56733 |
28.91 |
| 2026-06-14 12:00 |
11:36:17.17 |
-27:55:36.5 |
HIP 56733 |
29.38 |
| 2026-06-15 00:00 |
11:36:16.82 |
-27:55:01.0 |
HIP 56733 |
29.84 |
| 2026-06-15 12:00 |
11:36:16.51 |
-27:54:25.7 |
HIP 56733 |
30.29 |
| 2026-06-16 00:00 |
11:36:16.24 |
-27:53:50.7 |
HIP 56733 |
30.74 |
| 2026-06-16 12:00 |
11:36:16.01 |
-27:53:16.0 |
HIP 56733 |
31.18 |
| 2026-06-17 00:00 |
11:36:15.83 |
-27:52:41.5 |
HIP 56733 |
31.62 |
| 2026-06-17 12:00 |
11:36:15.69 |
-27:52:07.2 |
HIP 56733 |
32.06 |
| 2026-06-18 00:00 |
11:36:15.59 |
-27:51:33.2 |
HIP 56733 |
32.49 |
| 2026-06-18 12:00 |
11:36:15.53 |
-27:50:59.4 |
HIP 56733 |
32.91 |
| 2026-06-19 00:00 |
11:36:15.52 |
-27:50:25.9 |
HIP 56733 |
33.33 |
| 2026-06-19 12:00 |
11:36:15.55 |
-27:49:52.6 |
HIP 56733 |
33.74 |
| 2026-06-20 00:00 |
11:36:15.61 |
-27:49:19.6 |
HIP 56733 |
34.15 |
| 2026-06-20 12:00 |
11:36:15.72 |
-27:48:46.8 |
HIP 56733 |
34.56 |
| 2026-06-21 00:00 |
11:36:15.88 |
-27:48:14.3 |
HIP 56733 |
34.95 |
| 2026-06-21 12:00 |
11:36:16.07 |
-27:47:42.1 |
HIP 56733 |
35.35 |
| 2026-06-22 00:00 |
11:36:16.30 |
-27:47:10.2 |
HIP 56733 |
35.73 |