C/2016 T1 (Matheny)
| 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) |
| 2026-02-03 00:00 |
07:50:43.09 |
-31:07:18.5 |
HIP 38244 |
13.66 |
| 2026-02-03 12:00 |
07:50:36.36 |
-31:06:43.9 |
HIP 38244 |
13.36 |
| 2026-02-04 00:00 |
07:50:29.66 |
-31:06:08.7 |
HIP 38244 |
13.25 |
| 2026-02-04 12:00 |
07:50:22.98 |
-31:05:32.9 |
HIP 38244 |
13.33 |
| 2026-02-05 00:00 |
07:50:16.32 |
-31:04:56.6 |
HIP 38244 |
13.60 |
| 2026-02-05 12:00 |
07:50:09.68 |
-31:04:19.8 |
HIP 38244 |
14.04 |
| 2026-02-06 00:00 |
07:50:03.06 |
-31:03:42.5 |
HIP 38244 |
14.64 |
| 2026-02-06 12:00 |
07:49:56.47 |
-31:03:04.6 |
HIP 38244 |
15.38 |
| 2026-02-07 00:00 |
07:49:49.90 |
-31:02:26.3 |
HIP 38244 |
16.24 |
| 2026-02-07 12:00 |
07:49:43.36 |
-31:01:47.4 |
HIP 38244 |
17.21 |
| 2026-02-08 00:00 |
07:49:36.85 |
-31:01:07.9 |
HIP 38244 |
18.26 |
| 2026-02-08 12:00 |
07:49:30.35 |
-31:00:28.0 |
HIP 38110 |
19.02 |
| 2026-02-09 00:00 |
07:49:23.89 |
-30:59:47.6 |
HIP 38110 |
17.66 |
| 2026-02-09 12:00 |
07:49:17.45 |
-30:59:06.6 |
HIP 38110 |
16.32 |
| 2026-02-10 00:00 |
07:49:11.04 |
-30:58:25.2 |
HIP 38110 |
15.02 |
| 2026-02-10 12:00 |
07:49:04.66 |
-30:57:43.2 |
HIP 38110 |
13.76 |
| 2026-02-11 00:00 |
07:48:58.30 |
-30:57:00.8 |
HIP 38110 |
12.56 |
| 2026-02-11 12:00 |
07:48:51.98 |
-30:56:17.9 |
HIP 38110 |
11.43 |
| 2026-02-12 00:00 |
07:48:45.68 |
-30:55:34.5 |
HIP 38110 |
10.40 |
| 2026-02-12 12:00 |
07:48:39.41 |
-30:54:50.6 |
HIP 38110 |
9.50 |
| 2026-02-13 00:00 |
07:48:33.18 |
-30:54:06.2 |
HIP 38110 |
8.77 |
| 2026-02-13 12:00 |
07:48:26.97 |
-30:53:21.3 |
HIP 38110 |
8.25 |
| 2026-02-14 00:00 |
07:48:20.80 |
-30:52:36.0 |
HIP 38110 |
7.99 |
| 2026-02-14 12:00 |
07:48:14.65 |
-30:51:50.2 |
HIP 38110 |
8.00 |
| 2026-02-15 00:00 |
07:48:08.54 |
-30:51:03.9 |
HIP 38110 |
8.28 |
| 2026-02-15 12:00 |
07:48:02.47 |
-30:50:17.2 |
HIP 38110 |
8.81 |
| 2026-02-16 00:00 |
07:47:56.42 |
-30:49:30.0 |
HIP 38110 |
9.55 |
| 2026-02-16 12:00 |
07:47:50.41 |
-30:48:42.4 |
HIP 38110 |
10.45 |
| 2026-02-17 00:00 |
07:47:44.44 |
-30:47:54.3 |
HIP 38110 |
11.47 |
| 2026-02-17 12:00 |
07:47:38.50 |
-30:47:05.8 |
HIP 38110 |
12.58 |
| 2026-02-18 00:00 |
07:47:32.59 |
-30:46:16.8 |
HIP 38029 |
13.38 |
| 2026-02-18 12:00 |
07:47:26.72 |
-30:45:27.5 |
HIP 38029 |
12.68 |
| 2026-02-19 00:00 |
07:47:20.88 |
-30:44:37.6 |
HIP 38029 |
12.12 |
| 2026-02-19 12:00 |
07:47:15.09 |
-30:43:47.4 |
HIP 38029 |
11.72 |
| 2026-02-20 00:00 |
07:47:09.33 |
-30:42:56.7 |
HIP 38029 |
11.49 |
| 2026-02-20 12:00 |
07:47:03.60 |
-30:42:05.7 |
HIP 38029 |
11.45 |
| 2026-02-21 00:00 |
07:46:57.92 |
-30:41:14.2 |
HIP 38029 |
11.59 |
| 2026-02-21 12:00 |
07:46:52.27 |
-30:40:22.3 |
HIP 38029 |
11.90 |
| 2026-02-22 00:00 |
07:46:46.66 |
-30:39:30.0 |
HIP 38029 |
12.38 |
| 2026-02-22 12:00 |
07:46:41.09 |
-30:38:37.3 |
HIP 38029 |
13.00 |
| 2026-02-23 00:00 |
07:46:35.56 |
-30:37:44.3 |
HIP 38029 |
13.75 |
| 2026-02-23 12:00 |
07:46:30.07 |
-30:36:50.8 |
HIP 38029 |
14.60 |
| 2026-02-24 00:00 |
07:46:24.62 |
-30:35:57.0 |
HIP 38029 |
15.53 |