| Parameter |
Value |
| Designation |
C/2016 T2 (Matheny) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-12-29T02:20:01.553280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:27Z |
| Obs used |
178 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-11-29.0000000 |
| e |
0.98125057 |
| q (au) |
1.907813 |
| a (au) |
101.753121 |
| i (deg) |
81.311131 |
| Ω (om, deg) |
339.099229 |
| ω (w, deg) |
92.280552 |
| M (ma, deg) |
359.971099 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.146 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.146 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.879 |
| k |
0.986 |
| δ90 |
9.999 |
| 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) |
| 2026-07-29 00:00 |
09:25:40.37 |
-48:01:03.2 |
HIP 46206 |
4.61 |
| 2026-07-29 12:00 |
09:25:47.07 |
-48:01:05.4 |
HIP 46206 |
5.62 |
| 2026-07-30 00:00 |
09:25:53.79 |
-48:01:08.2 |
HIP 46206 |
6.67 |
| 2026-07-30 12:00 |
09:26:00.52 |
-48:01:11.4 |
HIP 46206 |
7.74 |
| 2026-07-31 00:00 |
09:26:07.26 |
-48:01:15.3 |
HIP 46206 |
8.82 |
| 2026-07-31 12:00 |
09:26:14.01 |
-48:01:19.6 |
HIP 46206 |
9.91 |
| 2026-08-01 00:00 |
09:26:20.76 |
-48:01:24.5 |
HIP 46206 |
11.01 |
| 2026-08-01 12:00 |
09:26:27.53 |
-48:01:30.0 |
HIP 46206 |
12.12 |
| 2026-08-02 00:00 |
09:26:34.30 |
-48:01:36.0 |
HIP 46206 |
13.23 |
| 2026-08-02 12:00 |
09:26:41.08 |
-48:01:42.5 |
HIP 46206 |
14.34 |
| 2026-08-03 00:00 |
09:26:47.87 |
-48:01:49.6 |
HIP 46206 |
15.46 |
| 2026-08-03 12:00 |
09:26:54.67 |
-48:01:57.2 |
HIP 46206 |
16.59 |
| 2026-08-04 00:00 |
09:27:01.47 |
-48:02:05.4 |
HIP 46206 |
17.71 |
| 2026-08-04 12:00 |
09:27:08.28 |
-48:02:14.1 |
HIP 46206 |
18.84 |
| 2026-08-05 00:00 |
09:27:15.09 |
-48:02:23.4 |
HIP 46206 |
19.97 |
| 2026-08-05 12:00 |
09:27:21.91 |
-48:02:33.2 |
HIP 46277 |
20.83 |
| 2026-08-06 00:00 |
09:27:28.74 |
-48:02:43.5 |
HIP 46277 |
21.66 |
| 2026-08-06 12:00 |
09:27:35.57 |
-48:02:54.4 |
HIP 46277 |
22.53 |
| 2026-08-07 00:00 |
09:27:42.40 |
-48:03:05.8 |
HIP 46277 |
23.43 |
| 2026-08-07 12:00 |
09:27:49.24 |
-48:03:17.8 |
HIP 46277 |
24.36 |
| 2026-08-08 00:00 |
09:27:56.08 |
-48:03:30.3 |
HIP 46277 |
25.32 |
| 2026-08-08 12:00 |
09:28:02.93 |
-48:03:43.3 |
HIP 46277 |
26.30 |
| 2026-08-09 00:00 |
09:28:09.78 |
-48:03:56.9 |
HIP 46277 |
27.30 |
| 2026-08-09 12:00 |
09:28:16.63 |
-48:04:11.0 |
HIP 46277 |
28.32 |
| 2026-08-10 00:00 |
09:28:23.48 |
-48:04:25.7 |
HIP 46277 |
29.35 |
| 2026-08-10 12:00 |
09:28:30.33 |
-48:04:40.9 |
HIP 46709 |
29.19 |
| 2026-08-11 00:00 |
09:28:37.18 |
-48:04:56.7 |
HIP 46709 |
28.16 |
| 2026-08-11 12:00 |
09:28:44.04 |
-48:05:12.9 |
HIP 46709 |
27.14 |
| 2026-08-12 00:00 |
09:28:50.89 |
-48:05:29.8 |
HIP 46709 |
26.13 |
| 2026-08-12 12:00 |
09:28:57.75 |
-48:05:47.1 |
HIP 46709 |
25.14 |
| 2026-08-13 00:00 |
09:29:04.60 |
-48:06:05.0 |
HIP 46709 |
24.18 |
| 2026-08-13 12:00 |
09:29:11.45 |
-48:06:23.5 |
HIP 46709 |
23.24 |
| 2026-08-14 00:00 |
09:29:18.30 |
-48:06:42.4 |
HIP 46709 |
22.32 |
| 2026-08-14 12:00 |
09:29:25.15 |
-48:07:01.9 |
HIP 46709 |
21.44 |
| 2026-08-15 00:00 |
09:29:31.99 |
-48:07:22.0 |
HIP 46709 |
20.60 |
| 2026-08-15 12:00 |
09:29:38.83 |
-48:07:42.5 |
HIP 46709 |
19.79 |
| 2026-08-16 00:00 |
09:29:45.67 |
-48:08:03.6 |
HIP 46709 |
19.03 |
| 2026-08-16 12:00 |
09:29:52.50 |
-48:08:25.2 |
HIP 46709 |
18.33 |
| 2026-08-17 00:00 |
09:29:59.33 |
-48:08:47.4 |
HIP 46709 |
17.68 |
| 2026-08-17 12:00 |
09:30:06.16 |
-48:09:10.1 |
HIP 46709 |
17.10 |
| 2026-08-18 00:00 |
09:30:12.98 |
-48:09:33.3 |
HIP 46709 |
16.60 |
| 2026-08-18 12:00 |
09:30:19.79 |
-48:09:57.0 |
HIP 46709 |
16.17 |
| 2026-08-19 00:00 |
09:30:26.59 |
-48:10:21.2 |
HIP 46709 |
15.84 |