C/2016 N4 (MASTER)
| 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 |
0.997 |
| 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) |
| 2026-02-03 00:00 |
11:40:44.28 |
-08:04:26.8 |
HIP 56960 |
19.98 |
| 2026-02-03 12:00 |
11:40:39.92 |
-08:04:21.2 |
HIP 56960 |
20.00 |
| 2026-02-04 00:00 |
11:40:35.53 |
-08:04:15.3 |
HIP 56960 |
20.08 |
| 2026-02-04 12:00 |
11:40:31.11 |
-08:04:09.1 |
HIP 56960 |
20.23 |
| 2026-02-05 00:00 |
11:40:26.66 |
-08:04:02.6 |
HIP 56960 |
20.44 |
| 2026-02-05 12:00 |
11:40:22.17 |
-08:03:55.8 |
HIP 56960 |
20.72 |
| 2026-02-06 00:00 |
11:40:17.65 |
-08:03:48.7 |
HIP 56960 |
21.05 |
| 2026-02-06 12:00 |
11:40:13.10 |
-08:03:41.2 |
HIP 56960 |
21.45 |
| 2026-02-07 00:00 |
11:40:08.52 |
-08:03:33.5 |
HIP 56960 |
21.91 |
| 2026-02-07 12:00 |
11:40:03.90 |
-08:03:25.5 |
HIP 56960 |
22.42 |
| 2026-02-08 00:00 |
11:39:59.26 |
-08:03:17.1 |
HIP 56960 |
22.99 |
| 2026-02-08 12:00 |
11:39:54.58 |
-08:03:08.5 |
HIP 56960 |
23.61 |
| 2026-02-09 00:00 |
11:39:49.88 |
-08:02:59.5 |
HIP 56960 |
24.27 |
| 2026-02-09 12:00 |
11:39:45.15 |
-08:02:50.3 |
HIP 56960 |
24.99 |
| 2026-02-10 00:00 |
11:39:40.39 |
-08:02:40.7 |
HIP 56960 |
25.74 |
| 2026-02-10 12:00 |
11:39:35.59 |
-08:02:30.9 |
HIP 56960 |
26.53 |
| 2026-02-11 00:00 |
11:39:30.77 |
-08:02:20.7 |
HIP 56960 |
27.37 |
| 2026-02-11 12:00 |
11:39:25.93 |
-08:02:10.3 |
HIP 56718 |
26.49 |
| 2026-02-12 00:00 |
11:39:21.05 |
-08:01:59.6 |
HIP 56718 |
25.37 |
| 2026-02-12 12:00 |
11:39:16.15 |
-08:01:48.6 |
HIP 56718 |
24.26 |
| 2026-02-13 00:00 |
11:39:11.22 |
-08:01:37.3 |
HIP 56718 |
23.16 |
| 2026-02-13 12:00 |
11:39:06.27 |
-08:01:25.7 |
HIP 56718 |
22.07 |
| 2026-02-14 00:00 |
11:39:01.29 |
-08:01:13.8 |
HIP 56718 |
20.99 |
| 2026-02-14 12:00 |
11:38:56.28 |
-08:01:01.7 |
HIP 56718 |
19.93 |
| 2026-02-15 00:00 |
11:38:51.25 |
-08:00:49.2 |
HIP 56718 |
18.89 |
| 2026-02-15 12:00 |
11:38:46.20 |
-08:00:36.5 |
HIP 56718 |
17.87 |
| 2026-02-16 00:00 |
11:38:41.12 |
-08:00:23.5 |
HIP 56718 |
16.88 |
| 2026-02-16 12:00 |
11:38:36.01 |
-08:00:10.2 |
HIP 56718 |
15.93 |
| 2026-02-17 00:00 |
11:38:30.89 |
-07:59:56.7 |
HIP 56718 |
15.03 |
| 2026-02-17 12:00 |
11:38:25.74 |
-07:59:42.8 |
HIP 56718 |
14.19 |
| 2026-02-18 00:00 |
11:38:20.57 |
-07:59:28.8 |
HIP 56718 |
13.42 |
| 2026-02-18 12:00 |
11:38:15.37 |
-07:59:14.4 |
HIP 56718 |
12.74 |
| 2026-02-19 00:00 |
11:38:10.16 |
-07:58:59.8 |
HIP 56718 |
12.16 |
| 2026-02-19 12:00 |
11:38:04.93 |
-07:58:44.9 |
HIP 56718 |
11.70 |
| 2026-02-20 00:00 |
11:37:59.67 |
-07:58:29.7 |
HIP 56718 |
11.38 |
| 2026-02-20 12:00 |
11:37:54.40 |
-07:58:14.3 |
HIP 56718 |
11.21 |
| 2026-02-21 00:00 |
11:37:49.10 |
-07:57:58.6 |
HIP 56718 |
11.20 |
| 2026-02-21 12:00 |
11:37:43.79 |
-07:57:42.7 |
HIP 56718 |
11.36 |
| 2026-02-22 00:00 |
11:37:38.46 |
-07:57:26.5 |
HIP 56718 |
11.67 |
| 2026-02-22 12:00 |
11:37:33.11 |
-07:57:10.1 |
HIP 56718 |
12.13 |
| 2026-02-23 00:00 |
11:37:27.74 |
-07:56:53.5 |
HIP 56718 |
12.72 |
| 2026-02-23 12:00 |
11:37:22.36 |
-07:56:36.5 |
HIP 56718 |
13.43 |
| 2026-02-24 00:00 |
11:37:16.95 |
-07:56:19.4 |
HIP 56718 |
14.24 |