| 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) |
| 2026-03-26 00:00 |
11:45:38.96 |
-29:44:47.4 |
HIP 57271 |
15.37 |
| 2026-03-26 12:00 |
11:45:33.27 |
-29:44:16.8 |
HIP 57271 |
14.65 |
| 2026-03-27 00:00 |
11:45:27.59 |
-29:43:45.9 |
HIP 57271 |
14.02 |
| 2026-03-27 12:00 |
11:45:21.92 |
-29:43:14.7 |
HIP 57271 |
13.50 |
| 2026-03-28 00:00 |
11:45:16.26 |
-29:42:43.1 |
HIP 57271 |
13.11 |
| 2026-03-28 12:00 |
11:45:10.61 |
-29:42:11.3 |
HIP 57271 |
12.85 |
| 2026-03-29 00:00 |
11:45:04.98 |
-29:41:39.2 |
HIP 57271 |
12.73 |
| 2026-03-29 12:00 |
11:44:59.35 |
-29:41:06.7 |
HIP 57271 |
12.75 |
| 2026-03-30 00:00 |
11:44:53.74 |
-29:40:34.0 |
HIP 57271 |
12.92 |
| 2026-03-30 12:00 |
11:44:48.14 |
-29:40:01.0 |
HIP 57217 |
12.16 |
| 2026-03-31 00:00 |
11:44:42.55 |
-29:39:27.7 |
HIP 57217 |
11.31 |
| 2026-03-31 12:00 |
11:44:36.97 |
-29:38:54.1 |
HIP 57217 |
10.57 |
| 2026-04-01 00:00 |
11:44:31.41 |
-29:38:20.3 |
HIP 57200 |
9.90 |
| 2026-04-01 12:00 |
11:44:25.87 |
-29:37:46.2 |
HIP 57200 |
8.92 |
| 2026-04-02 00:00 |
11:44:20.33 |
-29:37:11.8 |
HIP 57200 |
8.03 |
| 2026-04-02 12:00 |
11:44:14.82 |
-29:36:37.1 |
HIP 57200 |
7.29 |
| 2026-04-03 00:00 |
11:44:09.32 |
-29:36:02.2 |
HIP 57200 |
6.74 |
| 2026-04-03 12:00 |
11:44:03.83 |
-29:35:27.0 |
HIP 57200 |
6.43 |
| 2026-04-04 00:00 |
11:43:58.36 |
-29:34:51.5 |
HIP 57200 |
6.38 |
| 2026-04-04 12:00 |
11:43:52.91 |
-29:34:15.8 |
HIP 57200 |
6.62 |
| 2026-04-05 00:00 |
11:43:47.47 |
-29:33:39.8 |
HIP 57200 |
7.10 |
| 2026-04-05 12:00 |
11:43:42.05 |
-29:33:03.6 |
HIP 57200 |
7.79 |
| 2026-04-06 00:00 |
11:43:36.65 |
-29:32:27.1 |
HIP 57200 |
8.62 |
| 2026-04-06 12:00 |
11:43:31.27 |
-29:31:50.4 |
HIP 57200 |
9.57 |
| 2026-04-07 00:00 |
11:43:25.90 |
-29:31:13.4 |
HIP 57200 |
10.61 |
| 2026-04-07 12:00 |
11:43:20.56 |
-29:30:36.2 |
HIP 57200 |
11.70 |
| 2026-04-08 00:00 |
11:43:15.23 |
-29:29:58.8 |
HIP 57118 |
12.06 |
| 2026-04-08 12:00 |
11:43:09.93 |
-29:29:21.1 |
HIP 57118 |
11.73 |
| 2026-04-09 00:00 |
11:43:04.64 |
-29:28:43.2 |
HIP 57118 |
11.55 |
| 2026-04-09 12:00 |
11:42:59.38 |
-29:28:05.1 |
HIP 57118 |
11.53 |
| 2026-04-10 00:00 |
11:42:54.13 |
-29:27:26.8 |
HIP 57118 |
11.65 |
| 2026-04-10 12:00 |
11:42:48.91 |
-29:26:48.2 |
HIP 57118 |
11.93 |
| 2026-04-11 00:00 |
11:42:43.71 |
-29:26:09.4 |
HIP 57118 |
12.34 |
| 2026-04-11 12:00 |
11:42:38.53 |
-29:25:30.4 |
HIP 57118 |
12.87 |
| 2026-04-12 00:00 |
11:42:33.37 |
-29:24:51.2 |
HIP 57118 |
13.52 |
| 2026-04-12 12:00 |
11:42:28.24 |
-29:24:11.8 |
HIP 57118 |
14.25 |
| 2026-04-13 00:00 |
11:42:23.13 |
-29:23:32.2 |
HIP 57118 |
15.06 |
| 2026-04-13 12:00 |
11:42:18.04 |
-29:22:52.4 |
HIP 57118 |
15.94 |
| 2026-04-14 00:00 |
11:42:12.98 |
-29:22:12.4 |
HIP 57118 |
16.88 |
| 2026-04-14 12:00 |
11:42:07.94 |
-29:21:32.2 |
HIP 57001 |
16.19 |
| 2026-04-15 00:00 |
11:42:02.93 |
-29:20:51.9 |
HIP 57001 |
14.91 |
| 2026-04-15 12:00 |
11:41:57.94 |
-29:20:11.3 |
HIP 57001 |
13.64 |
| 2026-04-16 00:00 |
11:41:52.98 |
-29:19:30.6 |
HIP 57001 |
12.37 |