| 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) |
| 2026-07-29 00:00 |
11:26:26.28 |
-06:54:04.0 |
HIP 55969 |
35.05 |
| 2026-07-29 12:00 |
11:26:29.75 |
-06:54:25.6 |
HIP 55969 |
34.18 |
| 2026-07-30 00:00 |
11:26:33.24 |
-06:54:47.4 |
HIP 55969 |
33.30 |
| 2026-07-30 12:00 |
11:26:36.76 |
-06:55:09.5 |
HIP 55969 |
32.42 |
| 2026-07-31 00:00 |
11:26:40.31 |
-06:55:31.9 |
HIP 55969 |
31.53 |
| 2026-07-31 12:00 |
11:26:43.88 |
-06:55:54.5 |
HIP 55969 |
30.64 |
| 2026-08-01 00:00 |
11:26:47.48 |
-06:56:17.3 |
HIP 55969 |
29.75 |
| 2026-08-01 12:00 |
11:26:51.10 |
-06:56:40.4 |
HIP 55969 |
28.85 |
| 2026-08-02 00:00 |
11:26:54.75 |
-06:57:03.8 |
HIP 55969 |
27.96 |
| 2026-08-02 12:00 |
11:26:58.42 |
-06:57:27.4 |
HIP 55969 |
27.06 |
| 2026-08-03 00:00 |
11:27:02.12 |
-06:57:51.2 |
HIP 55969 |
26.16 |
| 2026-08-03 12:00 |
11:27:05.84 |
-06:58:15.3 |
HIP 55969 |
25.26 |
| 2026-08-04 00:00 |
11:27:09.58 |
-06:58:39.6 |
HIP 55969 |
24.37 |
| 2026-08-04 12:00 |
11:27:13.35 |
-06:59:04.1 |
HIP 55969 |
23.48 |
| 2026-08-05 00:00 |
11:27:17.15 |
-06:59:28.9 |
HIP 55969 |
22.59 |
| 2026-08-05 12:00 |
11:27:20.97 |
-06:59:53.9 |
HIP 55969 |
21.71 |
| 2026-08-06 00:00 |
11:27:24.81 |
-07:00:19.2 |
HIP 55969 |
20.83 |
| 2026-08-06 12:00 |
11:27:28.67 |
-07:00:44.7 |
HIP 55969 |
19.97 |
| 2026-08-07 00:00 |
11:27:32.56 |
-07:01:10.4 |
HIP 55969 |
19.11 |
| 2026-08-07 12:00 |
11:27:36.47 |
-07:01:36.4 |
HIP 55969 |
18.28 |
| 2026-08-08 00:00 |
11:27:40.40 |
-07:02:02.6 |
HIP 55969 |
17.46 |
| 2026-08-08 12:00 |
11:27:44.35 |
-07:02:29.1 |
HIP 55969 |
16.66 |
| 2026-08-09 00:00 |
11:27:48.32 |
-07:02:55.8 |
HIP 55969 |
15.89 |
| 2026-08-09 12:00 |
11:27:52.32 |
-07:03:22.7 |
HIP 55969 |
15.16 |
| 2026-08-10 00:00 |
11:27:56.34 |
-07:03:49.8 |
HIP 55969 |
14.46 |
| 2026-08-10 12:00 |
11:28:00.38 |
-07:04:17.2 |
HIP 55969 |
13.81 |
| 2026-08-11 00:00 |
11:28:04.43 |
-07:04:44.8 |
HIP 55969 |
13.22 |
| 2026-08-11 12:00 |
11:28:08.51 |
-07:05:12.6 |
HIP 55969 |
12.69 |
| 2026-08-12 00:00 |
11:28:12.61 |
-07:05:40.6 |
HIP 55969 |
12.23 |
| 2026-08-12 12:00 |
11:28:16.73 |
-07:06:08.9 |
HIP 55969 |
11.86 |
| 2026-08-13 00:00 |
11:28:20.87 |
-07:06:37.4 |
HIP 55969 |
11.59 |
| 2026-08-13 12:00 |
11:28:25.03 |
-07:07:06.1 |
HIP 55969 |
11.42 |
| 2026-08-14 00:00 |
11:28:29.20 |
-07:07:35.0 |
HIP 55969 |
11.36 |
| 2026-08-14 12:00 |
11:28:33.40 |
-07:08:04.1 |
HIP 55969 |
11.42 |
| 2026-08-15 00:00 |
11:28:37.61 |
-07:08:33.5 |
HIP 55969 |
11.59 |
| 2026-08-15 12:00 |
11:28:41.84 |
-07:09:03.1 |
HIP 55969 |
11.87 |
| 2026-08-16 00:00 |
11:28:46.09 |
-07:09:32.9 |
HIP 55969 |
12.25 |
| 2026-08-16 12:00 |
11:28:50.36 |
-07:10:02.8 |
HIP 55969 |
12.73 |
| 2026-08-17 00:00 |
11:28:54.64 |
-07:10:33.0 |
HIP 55969 |
13.30 |
| 2026-08-17 12:00 |
11:28:58.94 |
-07:11:03.5 |
HIP 55969 |
13.95 |
| 2026-08-18 00:00 |
11:29:03.26 |
-07:11:34.1 |
HIP 55969 |
14.66 |
| 2026-08-18 12:00 |
11:29:07.59 |
-07:12:04.9 |
HIP 55969 |
15.44 |
| 2026-08-19 00:00 |
11:29:11.94 |
-07:12:35.9 |
HIP 55969 |
16.27 |