| Parameter |
Value |
| Designation |
C/2016 N6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-07-18T04:53:54.179520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
3071 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-02-01.0000000 |
| e |
0.99865186 |
| q (au) |
2.669116 |
| a (au) |
1979.851996 |
| i (deg) |
105.830421 |
| Ω (om, deg) |
298.977675 |
| ω (w, deg) |
162.803199 |
| M (ma, deg) |
359.998129 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.902 + 3.333\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.902 |
| n |
3.333 |
| gf |
1.000 |
| gb |
-0.687 |
| k |
0.800 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2016-06-27 |
2016-10-28 |
+38.9147 |
-31.451 |
| 2016-10-28 |
2018-06-20 |
+1.1594 |
-0.936 |
| 2018-08-28 |
2019-01-14 |
+13.3133 |
-6.770 |
| 2019-01-14 |
2020-12-12 |
-0.7531 |
+0.155 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
00:35:33.77 |
-61:03:19.1 |
HIP 2881 |
6.85 |
| 2026-05-12 12:00 |
00:35:40.75 |
-61:03:59.4 |
HIP 2881 |
6.10 |
| 2026-05-13 00:00 |
00:35:47.67 |
-61:04:40.2 |
HIP 2881 |
5.46 |
| 2026-05-13 12:00 |
00:35:54.53 |
-61:05:21.7 |
HIP 2881 |
5.00 |
| 2026-05-14 00:00 |
00:36:01.34 |
-61:06:03.7 |
HIP 2881 |
4.75 |
| 2026-05-14 12:00 |
00:36:08.08 |
-61:06:46.3 |
HIP 2881 |
4.75 |
| 2026-05-15 00:00 |
00:36:14.77 |
-61:07:29.5 |
HIP 2881 |
5.00 |
| 2026-05-15 12:00 |
00:36:21.40 |
-61:08:13.2 |
HIP 2881 |
5.47 |
| 2026-05-16 00:00 |
00:36:27.96 |
-61:08:57.5 |
HIP 2881 |
6.11 |
| 2026-05-16 12:00 |
00:36:34.47 |
-61:09:42.4 |
HIP 2881 |
6.87 |
| 2026-05-17 00:00 |
00:36:40.91 |
-61:10:27.9 |
HIP 2881 |
7.72 |
| 2026-05-17 12:00 |
00:36:47.29 |
-61:11:13.9 |
HIP 2881 |
8.62 |
| 2026-05-18 00:00 |
00:36:53.61 |
-61:12:00.4 |
HIP 2881 |
9.58 |
| 2026-05-18 12:00 |
00:36:59.86 |
-61:12:47.6 |
HIP 2881 |
10.56 |
| 2026-05-19 00:00 |
00:37:06.05 |
-61:13:35.2 |
HIP 2881 |
11.57 |
| 2026-05-19 12:00 |
00:37:12.18 |
-61:14:23.4 |
HIP 2881 |
12.59 |
| 2026-05-20 00:00 |
00:37:18.23 |
-61:15:12.2 |
HIP 2881 |
13.64 |
| 2026-05-20 12:00 |
00:37:24.23 |
-61:16:01.5 |
HIP 2881 |
14.69 |
| 2026-05-21 00:00 |
00:37:30.15 |
-61:16:51.3 |
HIP 2881 |
15.75 |
| 2026-05-21 12:00 |
00:37:36.01 |
-61:17:41.7 |
HIP 2881 |
16.82 |
| 2026-05-22 00:00 |
00:37:41.81 |
-61:18:32.6 |
HIP 2881 |
17.90 |
| 2026-05-22 12:00 |
00:37:47.53 |
-61:19:24.0 |
HIP 2881 |
18.98 |
| 2026-05-23 00:00 |
00:37:53.19 |
-61:20:16.0 |
HIP 2881 |
20.07 |
| 2026-05-23 12:00 |
00:37:58.77 |
-61:21:08.5 |
HIP 2881 |
21.16 |
| 2026-05-24 00:00 |
00:38:04.29 |
-61:22:01.4 |
HIP 2881 |
22.26 |
| 2026-05-24 12:00 |
00:38:09.74 |
-61:22:54.9 |
HIP 2881 |
23.36 |
| 2026-05-25 00:00 |
00:38:15.11 |
-61:23:48.9 |
HIP 2881 |
24.46 |
| 2026-05-25 12:00 |
00:38:20.42 |
-61:24:43.4 |
HIP 2881 |
25.57 |
| 2026-05-26 00:00 |
00:38:25.65 |
-61:25:38.5 |
HIP 2881 |
26.68 |
| 2026-05-26 12:00 |
00:38:30.82 |
-61:26:34.0 |
HIP 3303 |
26.27 |
| 2026-05-27 00:00 |
00:38:35.91 |
-61:27:30.0 |
HIP 3303 |
25.85 |
| 2026-05-27 12:00 |
00:38:40.92 |
-61:28:26.4 |
HIP 3303 |
25.49 |
| 2026-05-28 00:00 |
00:38:45.87 |
-61:29:23.4 |
HIP 3303 |
25.18 |
| 2026-05-28 12:00 |
00:38:50.74 |
-61:30:20.9 |
HIP 3303 |
24.93 |
| 2026-05-29 00:00 |
00:38:55.54 |
-61:31:18.8 |
HIP 3303 |
24.73 |
| 2026-05-29 12:00 |
00:39:00.26 |
-61:32:17.2 |
HIP 3303 |
24.60 |
| 2026-05-30 00:00 |
00:39:04.91 |
-61:33:16.1 |
HIP 3303 |
24.53 |
| 2026-05-30 12:00 |
00:39:09.48 |
-61:34:15.5 |
HIP 3303 |
24.53 |
| 2026-05-31 00:00 |
00:39:13.97 |
-61:35:15.3 |
HIP 3303 |
24.59 |
| 2026-05-31 12:00 |
00:39:18.39 |
-61:36:15.6 |
HIP 3303 |
24.72 |
| 2026-06-01 00:00 |
00:39:22.73 |
-61:37:16.3 |
HIP 3303 |
24.90 |
| 2026-06-01 12:00 |
00:39:27.00 |
-61:38:17.5 |
HIP 3303 |
25.16 |
| 2026-06-02 00:00 |
00:39:31.18 |
-61:39:19.2 |
HIP 3303 |
25.47 |