| Parameter |
Value |
| Designation |
C/2016 VZ18 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-03-07T09:07:19.603200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:28Z |
| Obs used |
351 |
| NEO |
- |
| M1 |
18.400 |
| K1 |
9.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-02-20.0000000 |
| e |
0.99532240 |
| q (au) |
0.910266 |
| a (au) |
194.601204 |
| i (deg) |
24.035635 |
| Ω (om, deg) |
98.954808 |
| ω (w, deg) |
36.386221 |
| M (ma, deg) |
359.994416 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.990 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.990 |
| 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) |
| 2026-09-20 00:00 |
19:31:20.43 |
-27:53:20.6 |
HIP 96124 |
19.26 |
| 2026-09-20 12:00 |
19:31:18.60 |
-27:53:18.7 |
HIP 96124 |
19.64 |
| 2026-09-21 00:00 |
19:31:16.80 |
-27:53:16.7 |
HIP 96124 |
20.02 |
| 2026-09-21 12:00 |
19:31:15.06 |
-27:53:14.6 |
HIP 96124 |
20.39 |
| 2026-09-22 00:00 |
19:31:13.35 |
-27:53:12.3 |
HIP 96124 |
20.75 |
| 2026-09-22 12:00 |
19:31:11.70 |
-27:53:10.0 |
HIP 96124 |
21.10 |
| 2026-09-23 00:00 |
19:31:10.09 |
-27:53:07.5 |
HIP 96124 |
21.45 |
| 2026-09-23 12:00 |
19:31:08.52 |
-27:53:05.0 |
HIP 96124 |
21.79 |
| 2026-09-24 00:00 |
19:31:07.00 |
-27:53:02.3 |
HIP 96124 |
22.11 |
| 2026-09-24 12:00 |
19:31:05.53 |
-27:52:59.5 |
HIP 96124 |
22.43 |
| 2026-09-25 00:00 |
19:31:04.10 |
-27:52:56.5 |
HIP 96124 |
22.75 |
| 2026-09-25 12:00 |
19:31:02.72 |
-27:52:53.5 |
HIP 95887 |
22.61 |
| 2026-09-26 00:00 |
19:31:01.38 |
-27:52:50.4 |
HIP 95887 |
22.40 |
| 2026-09-26 12:00 |
19:31:00.09 |
-27:52:47.1 |
HIP 95887 |
22.19 |
| 2026-09-27 00:00 |
19:30:58.85 |
-27:52:43.8 |
HIP 95887 |
22.00 |
| 2026-09-27 12:00 |
19:30:57.66 |
-27:52:40.3 |
HIP 95887 |
21.80 |
| 2026-09-28 00:00 |
19:30:56.51 |
-27:52:36.7 |
HIP 95887 |
21.62 |
| 2026-09-28 12:00 |
19:30:55.40 |
-27:52:33.0 |
HIP 95887 |
21.44 |
| 2026-09-29 00:00 |
19:30:54.34 |
-27:52:29.2 |
HIP 95887 |
21.26 |
| 2026-09-29 12:00 |
19:30:53.33 |
-27:52:25.3 |
HIP 95887 |
21.09 |
| 2026-09-30 00:00 |
19:30:52.37 |
-27:52:21.3 |
HIP 95887 |
20.93 |
| 2026-09-30 12:00 |
19:30:51.45 |
-27:52:17.1 |
HIP 95887 |
20.76 |
| 2026-10-01 00:00 |
19:30:50.58 |
-27:52:12.9 |
HIP 95887 |
20.61 |
| 2026-10-01 12:00 |
19:30:49.76 |
-27:52:08.6 |
HIP 95887 |
20.45 |
| 2026-10-02 00:00 |
19:30:48.98 |
-27:52:04.1 |
HIP 95887 |
20.31 |
| 2026-10-02 12:00 |
19:30:48.25 |
-27:51:59.6 |
HIP 95887 |
20.16 |
| 2026-10-03 00:00 |
19:30:47.57 |
-27:51:54.9 |
HIP 95887 |
20.02 |
| 2026-10-03 12:00 |
19:30:46.93 |
-27:51:50.1 |
HIP 95887 |
19.89 |
| 2026-10-04 00:00 |
19:30:46.35 |
-27:51:45.3 |
HIP 95887 |
19.75 |
| 2026-10-04 12:00 |
19:30:45.80 |
-27:51:40.3 |
HIP 95887 |
19.62 |
| 2026-10-05 00:00 |
19:30:45.31 |
-27:51:35.2 |
HIP 95887 |
19.50 |
| 2026-10-05 12:00 |
19:30:44.86 |
-27:51:30.1 |
HIP 95887 |
19.38 |
| 2026-10-06 00:00 |
19:30:44.47 |
-27:51:24.8 |
HIP 95887 |
19.26 |
| 2026-10-06 12:00 |
19:30:44.11 |
-27:51:19.4 |
HIP 95887 |
19.14 |
| 2026-10-07 00:00 |
19:30:43.81 |
-27:51:13.9 |
HIP 95887 |
19.03 |
| 2026-10-07 12:00 |
19:30:43.55 |
-27:51:08.3 |
HIP 95887 |
18.92 |
| 2026-10-08 00:00 |
19:30:43.34 |
-27:51:02.6 |
HIP 95887 |
18.82 |
| 2026-10-08 12:00 |
19:30:43.18 |
-27:50:56.9 |
HIP 95887 |
18.71 |
| 2026-10-09 00:00 |
19:30:43.07 |
-27:50:51.0 |
HIP 95887 |
18.62 |
| 2026-10-09 12:00 |
19:30:43.00 |
-27:50:45.0 |
HIP 95887 |
18.52 |
| 2026-10-10 00:00 |
19:30:42.98 |
-27:50:38.9 |
HIP 95887 |
18.43 |
| 2026-10-10 12:00 |
19:30:43.01 |
-27:50:32.7 |
HIP 95887 |
18.34 |
| 2026-10-11 00:00 |
19:30:43.09 |
-27:50:26.4 |
HIP 95887 |
18.26 |