| Parameter |
Value |
| Designation |
C/2016 N4 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-09-16T14:17:55.443840Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:42:28Z |
| Obs used |
2084 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-09-11.0000000 |
| e |
0.99939359 |
| q (au) |
3.199121 |
| a (au) |
5275.516225 |
| i (deg) |
72.557241 |
| Ω (om, deg) |
354.031309 |
| ω (w, deg) |
55.954990 |
| M (ma, deg) |
359.999986 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.927 + 2.762\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.927 |
| n |
2.762 |
| gf |
1.000 |
| gb |
-0.817 |
| 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 |
| 2015-09-11 |
2016-10-30 |
+2.0258 |
-1.477 |
| 2016-10-30 |
2017-09-16 |
-2.1552 |
+0.913 |
| 2017-09-16 |
2020-03-26 |
+1.1161 |
-0.650 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
11:23:40.60 |
-06:43:21.3 |
HIP 55635 |
25.64 |
| 2026-06-01 12:00 |
11:23:39.68 |
-06:43:10.9 |
HIP 55635 |
25.84 |
| 2026-06-02 00:00 |
11:23:38.80 |
-06:43:00.7 |
HIP 55635 |
26.03 |
| 2026-06-02 12:00 |
11:23:37.96 |
-06:42:50.8 |
HIP 55635 |
26.22 |
| 2026-06-03 00:00 |
11:23:37.17 |
-06:42:41.2 |
HIP 55635 |
26.41 |
| 2026-06-03 12:00 |
11:23:36.42 |
-06:42:31.8 |
HIP 55635 |
26.59 |
| 2026-06-04 00:00 |
11:23:35.72 |
-06:42:22.6 |
HIP 55635 |
26.77 |
| 2026-06-04 12:00 |
11:23:35.06 |
-06:42:13.8 |
HIP 55635 |
26.94 |
| 2026-06-05 00:00 |
11:23:34.45 |
-06:42:05.2 |
HIP 55635 |
27.10 |
| 2026-06-05 12:00 |
11:23:33.87 |
-06:41:56.8 |
HIP 55635 |
27.26 |
| 2026-06-06 00:00 |
11:23:33.35 |
-06:41:48.7 |
HIP 55635 |
27.42 |
| 2026-06-06 12:00 |
11:23:32.86 |
-06:41:40.9 |
HIP 55635 |
27.56 |
| 2026-06-07 00:00 |
11:23:32.42 |
-06:41:33.4 |
HIP 55635 |
27.71 |
| 2026-06-07 12:00 |
11:23:32.03 |
-06:41:26.1 |
HIP 55635 |
27.84 |
| 2026-06-08 00:00 |
11:23:31.68 |
-06:41:19.1 |
HIP 55635 |
27.97 |
| 2026-06-08 12:00 |
11:23:31.37 |
-06:41:12.4 |
HIP 55635 |
28.10 |
| 2026-06-09 00:00 |
11:23:31.11 |
-06:41:06.0 |
HIP 55635 |
28.21 |
| 2026-06-09 12:00 |
11:23:30.89 |
-06:40:59.8 |
HIP 55635 |
28.32 |
| 2026-06-10 00:00 |
11:23:30.71 |
-06:40:53.9 |
HIP 55635 |
28.43 |
| 2026-06-10 12:00 |
11:23:30.58 |
-06:40:48.2 |
HIP 55635 |
28.53 |
| 2026-06-11 00:00 |
11:23:30.49 |
-06:40:42.9 |
HIP 55635 |
28.62 |
| 2026-06-11 12:00 |
11:23:30.45 |
-06:40:37.8 |
HIP 55635 |
28.70 |
| 2026-06-12 00:00 |
11:23:30.45 |
-06:40:33.0 |
HIP 55635 |
28.78 |
| 2026-06-12 12:00 |
11:23:30.49 |
-06:40:28.5 |
HIP 55635 |
28.85 |
| 2026-06-13 00:00 |
11:23:30.57 |
-06:40:24.3 |
HIP 55635 |
28.92 |
| 2026-06-13 12:00 |
11:23:30.70 |
-06:40:20.3 |
HIP 55635 |
28.98 |
| 2026-06-14 00:00 |
11:23:30.88 |
-06:40:16.6 |
HIP 55635 |
29.03 |
| 2026-06-14 12:00 |
11:23:31.09 |
-06:40:13.2 |
HIP 55635 |
29.08 |
| 2026-06-15 00:00 |
11:23:31.35 |
-06:40:10.1 |
HIP 55635 |
29.12 |
| 2026-06-15 12:00 |
11:23:31.66 |
-06:40:07.3 |
HIP 55635 |
29.15 |
| 2026-06-16 00:00 |
11:23:32.00 |
-06:40:04.7 |
HIP 55635 |
29.18 |
| 2026-06-16 12:00 |
11:23:32.39 |
-06:40:02.5 |
HIP 55635 |
29.20 |
| 2026-06-17 00:00 |
11:23:32.82 |
-06:40:00.5 |
HIP 55635 |
29.22 |
| 2026-06-17 12:00 |
11:23:33.30 |
-06:39:58.8 |
HIP 55635 |
29.23 |
| 2026-06-18 00:00 |
11:23:33.82 |
-06:39:57.4 |
HIP 55635 |
29.23 |
| 2026-06-18 12:00 |
11:23:34.38 |
-06:39:56.3 |
HIP 55635 |
29.23 |
| 2026-06-19 00:00 |
11:23:34.98 |
-06:39:55.4 |
HIP 55635 |
29.22 |
| 2026-06-19 12:00 |
11:23:35.62 |
-06:39:54.9 |
HIP 55635 |
29.21 |
| 2026-06-20 00:00 |
11:23:36.31 |
-06:39:54.6 |
HIP 55635 |
29.19 |
| 2026-06-20 12:00 |
11:23:37.04 |
-06:39:54.7 |
HIP 55635 |
29.17 |
| 2026-06-21 00:00 |
11:23:37.81 |
-06:39:55.0 |
HIP 55635 |
29.14 |
| 2026-06-21 12:00 |
11:23:38.62 |
-06:39:55.6 |
HIP 55635 |
29.11 |
| 2026-06-22 00:00 |
11:23:39.48 |
-06:39:56.4 |
HIP 55635 |
29.07 |