| Parameter |
Value |
| Designation |
C/2016 T1 (Matheny) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-02-01T15:36:06.151680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
130 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-11-25.0000000 |
| e |
0.98175990 |
| q (au) |
2.300016 |
| a (au) |
126.096668 |
| i (deg) |
129.818033 |
| Ω (om, deg) |
56.230143 |
| ω (w, deg) |
137.346507 |
| M (ma, deg) |
359.952215 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.392 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.392 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:00:10.34 |
-28:06:07.6 |
HIP 39001 |
20.63 |
| 2026-09-20 12:00 |
08:00:12.64 |
-28:06:58.7 |
HIP 39062 |
21.17 |
| 2026-09-21 00:00 |
08:00:14.89 |
-28:07:49.9 |
HIP 39062 |
20.63 |
| 2026-09-21 12:00 |
08:00:17.10 |
-28:08:41.4 |
HIP 39062 |
20.13 |
| 2026-09-22 00:00 |
08:00:19.27 |
-28:09:33.0 |
HIP 39062 |
19.65 |
| 2026-09-22 12:00 |
08:00:21.40 |
-28:10:24.8 |
HIP 39062 |
19.20 |
| 2026-09-23 00:00 |
08:00:23.48 |
-28:11:16.7 |
HIP 39062 |
18.79 |
| 2026-09-23 12:00 |
08:00:25.53 |
-28:12:08.9 |
HIP 39062 |
18.41 |
| 2026-09-24 00:00 |
08:00:27.54 |
-28:13:01.1 |
HIP 39062 |
18.07 |
| 2026-09-24 12:00 |
08:00:29.50 |
-28:13:53.6 |
HIP 39062 |
17.77 |
| 2026-09-25 00:00 |
08:00:31.42 |
-28:14:46.2 |
HIP 39062 |
17.50 |
| 2026-09-25 12:00 |
08:00:33.30 |
-28:15:38.9 |
HIP 39062 |
17.28 |
| 2026-09-26 00:00 |
08:00:35.13 |
-28:16:31.8 |
HIP 39062 |
17.11 |
| 2026-09-26 12:00 |
08:00:36.93 |
-28:17:24.8 |
HIP 39062 |
16.97 |
| 2026-09-27 00:00 |
08:00:38.68 |
-28:18:18.0 |
HIP 39269 |
16.71 |
| 2026-09-27 12:00 |
08:00:40.39 |
-28:19:11.3 |
HIP 39269 |
16.05 |
| 2026-09-28 00:00 |
08:00:42.05 |
-28:20:04.7 |
HIP 39269 |
15.42 |
| 2026-09-28 12:00 |
08:00:43.67 |
-28:20:58.2 |
HIP 39269 |
14.84 |
| 2026-09-29 00:00 |
08:00:45.25 |
-28:21:51.9 |
HIP 39269 |
14.32 |
| 2026-09-29 12:00 |
08:00:46.78 |
-28:22:45.7 |
HIP 39269 |
13.84 |
| 2026-09-30 00:00 |
08:00:48.27 |
-28:23:39.7 |
HIP 39269 |
13.43 |
| 2026-09-30 12:00 |
08:00:49.72 |
-28:24:33.7 |
HIP 39269 |
13.09 |
| 2026-10-01 00:00 |
08:00:51.12 |
-28:25:27.8 |
HIP 39269 |
12.82 |
| 2026-10-01 12:00 |
08:00:52.48 |
-28:26:22.1 |
HIP 39269 |
12.63 |
| 2026-10-02 00:00 |
08:00:53.79 |
-28:27:16.4 |
HIP 39269 |
12.51 |
| 2026-10-02 12:00 |
08:00:55.06 |
-28:28:10.9 |
HIP 39269 |
12.48 |
| 2026-10-03 00:00 |
08:00:56.28 |
-28:29:05.5 |
HIP 39269 |
12.53 |
| 2026-10-03 12:00 |
08:00:57.45 |
-28:30:00.1 |
HIP 39269 |
12.66 |
| 2026-10-04 00:00 |
08:00:58.58 |
-28:30:54.8 |
HIP 39269 |
12.86 |
| 2026-10-04 12:00 |
08:00:59.67 |
-28:31:49.7 |
HIP 39269 |
13.15 |
| 2026-10-05 00:00 |
08:01:00.71 |
-28:32:44.6 |
HIP 39269 |
13.50 |
| 2026-10-05 12:00 |
08:01:01.70 |
-28:33:39.5 |
HIP 39269 |
13.91 |
| 2026-10-06 00:00 |
08:01:02.65 |
-28:34:34.6 |
HIP 39269 |
14.39 |
| 2026-10-06 12:00 |
08:01:03.55 |
-28:35:29.7 |
HIP 39269 |
14.91 |
| 2026-10-07 00:00 |
08:01:04.40 |
-28:36:24.9 |
HIP 39269 |
15.48 |
| 2026-10-07 12:00 |
08:01:05.20 |
-28:37:20.1 |
HIP 39269 |
16.10 |
| 2026-10-08 00:00 |
08:01:05.96 |
-28:38:15.4 |
HIP 39269 |
16.75 |
| 2026-10-08 12:00 |
08:01:06.67 |
-28:39:10.8 |
HIP 39269 |
17.43 |
| 2026-10-09 00:00 |
08:01:07.34 |
-28:40:06.1 |
HIP 39269 |
18.14 |
| 2026-10-09 12:00 |
08:01:07.95 |
-28:41:01.6 |
HIP 39086 |
18.17 |
| 2026-10-10 00:00 |
08:01:08.52 |
-28:41:57.0 |
HIP 39086 |
18.16 |
| 2026-10-10 12:00 |
08:01:09.04 |
-28:42:52.6 |
HIP 39086 |
18.19 |
| 2026-10-11 00:00 |
08:01:09.51 |
-28:43:48.1 |
HIP 39086 |
18.25 |