| 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 |
-0.552 |
| 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) |
| 2026-03-26 00:00 |
07:42:21.77 |
-29:33:44.3 |
HIP 37639 |
18.29 |
| 2026-03-26 12:00 |
07:42:19.27 |
-29:32:37.0 |
HIP 37639 |
17.99 |
| 2026-03-27 00:00 |
07:42:16.82 |
-29:31:29.7 |
HIP 37639 |
17.77 |
| 2026-03-27 12:00 |
07:42:14.42 |
-29:30:22.3 |
HIP 37639 |
17.62 |
| 2026-03-28 00:00 |
07:42:12.08 |
-29:29:14.8 |
HIP 37639 |
17.55 |
| 2026-03-28 12:00 |
07:42:09.78 |
-29:28:07.3 |
HIP 37639 |
17.55 |
| 2026-03-29 00:00 |
07:42:07.55 |
-29:26:59.8 |
HIP 37639 |
17.63 |
| 2026-03-29 12:00 |
07:42:05.36 |
-29:25:52.2 |
HIP 37639 |
17.78 |
| 2026-03-30 00:00 |
07:42:03.23 |
-29:24:44.6 |
HIP 37639 |
18.00 |
| 2026-03-30 12:00 |
07:42:01.15 |
-29:23:37.0 |
HIP 37639 |
18.29 |
| 2026-03-31 00:00 |
07:41:59.13 |
-29:22:29.4 |
HIP 37639 |
18.64 |
| 2026-03-31 12:00 |
07:41:57.16 |
-29:21:21.8 |
HIP 37639 |
19.05 |
| 2026-04-01 00:00 |
07:41:55.24 |
-29:20:14.2 |
HIP 37639 |
19.52 |
| 2026-04-01 12:00 |
07:41:53.38 |
-29:19:06.5 |
HIP 37639 |
20.04 |
| 2026-04-02 00:00 |
07:41:51.56 |
-29:17:58.9 |
HIP 37639 |
20.60 |
| 2026-04-02 12:00 |
07:41:49.81 |
-29:16:51.3 |
HIP 37639 |
21.20 |
| 2026-04-03 00:00 |
07:41:48.10 |
-29:15:43.7 |
HIP 37639 |
21.84 |
| 2026-04-03 12:00 |
07:41:46.45 |
-29:14:36.1 |
HIP 37639 |
22.51 |
| 2026-04-04 00:00 |
07:41:44.85 |
-29:13:28.5 |
HIP 37639 |
23.22 |
| 2026-04-04 12:00 |
07:41:43.31 |
-29:12:21.0 |
HIP 37639 |
23.94 |
| 2026-04-05 00:00 |
07:41:41.82 |
-29:11:13.5 |
HIP 37639 |
24.70 |
| 2026-04-05 12:00 |
07:41:40.38 |
-29:10:06.0 |
HIP 37641 |
25.38 |
| 2026-04-06 00:00 |
07:41:39.00 |
-29:08:58.6 |
HIP 37641 |
26.08 |
| 2026-04-06 12:00 |
07:41:37.67 |
-29:07:51.2 |
HIP 37315 |
26.14 |
| 2026-04-07 00:00 |
07:41:36.39 |
-29:06:43.9 |
HIP 37315 |
26.05 |
| 2026-04-07 12:00 |
07:41:35.17 |
-29:05:36.7 |
HIP 37315 |
26.02 |
| 2026-04-08 00:00 |
07:41:34.00 |
-29:04:29.4 |
HIP 37314 |
25.62 |
| 2026-04-08 12:00 |
07:41:32.88 |
-29:03:22.3 |
HIP 37314 |
25.25 |
| 2026-04-09 00:00 |
07:41:31.81 |
-29:02:15.2 |
HIP 37314 |
24.94 |
| 2026-04-09 12:00 |
07:41:30.80 |
-29:01:08.2 |
HIP 37314 |
24.68 |
| 2026-04-10 00:00 |
07:41:29.84 |
-29:00:01.3 |
HIP 37314 |
24.49 |
| 2026-04-10 12:00 |
07:41:28.94 |
-28:58:54.5 |
HIP 37314 |
24.36 |
| 2026-04-11 00:00 |
07:41:28.09 |
-28:57:47.7 |
HIP 37314 |
24.30 |
| 2026-04-11 12:00 |
07:41:27.29 |
-28:56:41.1 |
HIP 37314 |
24.29 |
| 2026-04-12 00:00 |
07:41:26.54 |
-28:55:34.5 |
HIP 37314 |
24.36 |
| 2026-04-12 12:00 |
07:41:25.85 |
-28:54:28.1 |
HIP 37314 |
24.48 |
| 2026-04-13 00:00 |
07:41:25.21 |
-28:53:21.7 |
HIP 37314 |
24.66 |
| 2026-04-13 12:00 |
07:41:24.62 |
-28:52:15.5 |
HIP 37314 |
24.90 |
| 2026-04-14 00:00 |
07:41:24.08 |
-28:51:09.4 |
HIP 37314 |
25.20 |
| 2026-04-14 12:00 |
07:41:23.60 |
-28:50:03.4 |
HIP 37314 |
25.56 |
| 2026-04-15 00:00 |
07:41:23.17 |
-28:48:57.6 |
HIP 37314 |
25.96 |
| 2026-04-15 12:00 |
07:41:22.79 |
-28:47:51.8 |
HIP 37314 |
26.41 |
| 2026-04-16 00:00 |
07:41:22.47 |
-28:46:46.2 |
HIP 37314 |
26.91 |