| 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) |
| 2026-05-12 00:00 |
07:42:13.56 |
-27:54:47.8 |
HIP 37554 |
11.35 |
| 2026-05-12 12:00 |
07:42:15.76 |
-27:53:55.2 |
HIP 37554 |
10.38 |
| 2026-05-13 00:00 |
07:42:18.00 |
-27:53:02.9 |
HIP 37554 |
9.43 |
| 2026-05-13 12:00 |
07:42:20.28 |
-27:52:10.9 |
HIP 37554 |
8.49 |
| 2026-05-14 00:00 |
07:42:22.60 |
-27:51:19.3 |
HIP 37554 |
7.57 |
| 2026-05-14 12:00 |
07:42:24.96 |
-27:50:28.0 |
HIP 37554 |
6.68 |
| 2026-05-15 00:00 |
07:42:27.37 |
-27:49:37.0 |
HIP 37554 |
5.83 |
| 2026-05-15 12:00 |
07:42:29.81 |
-27:48:46.4 |
HIP 37554 |
5.05 |
| 2026-05-16 00:00 |
07:42:32.30 |
-27:47:56.2 |
HIP 37554 |
4.36 |
| 2026-05-16 12:00 |
07:42:34.82 |
-27:47:06.3 |
HIP 37554 |
3.83 |
| 2026-05-17 00:00 |
07:42:37.39 |
-27:46:16.8 |
HIP 37554 |
3.52 |
| 2026-05-17 12:00 |
07:42:39.99 |
-27:45:27.6 |
HIP 37554 |
3.49 |
| 2026-05-18 00:00 |
07:42:42.64 |
-27:44:38.8 |
HIP 37554 |
3.75 |
| 2026-05-18 12:00 |
07:42:45.32 |
-27:43:50.4 |
HIP 37554 |
4.24 |
| 2026-05-19 00:00 |
07:42:48.05 |
-27:43:02.4 |
HIP 37611 |
4.43 |
| 2026-05-19 12:00 |
07:42:50.81 |
-27:42:14.7 |
HIP 37611 |
3.46 |
| 2026-05-20 00:00 |
07:42:53.61 |
-27:41:27.4 |
HIP 37611 |
2.49 |
| 2026-05-20 12:00 |
07:42:56.44 |
-27:40:40.4 |
HIP 37611 |
1.57 |
| 2026-05-21 00:00 |
07:42:59.32 |
-27:39:53.9 |
HIP 37611 |
0.85 |
| 2026-05-21 12:00 |
07:43:02.23 |
-27:39:07.7 |
HIP 37611 |
0.99 |
| 2026-05-22 00:00 |
07:43:05.18 |
-27:38:21.9 |
HIP 37611 |
1.80 |
| 2026-05-22 12:00 |
07:43:08.16 |
-27:37:36.6 |
HIP 37611 |
2.74 |
| 2026-05-23 00:00 |
07:43:11.18 |
-27:36:51.6 |
HIP 37611 |
3.71 |
| 2026-05-23 12:00 |
07:43:14.24 |
-27:36:06.9 |
HIP 37611 |
4.69 |
| 2026-05-24 00:00 |
07:43:17.33 |
-27:35:22.7 |
HIP 37611 |
5.69 |
| 2026-05-24 12:00 |
07:43:20.46 |
-27:34:38.9 |
HIP 37611 |
6.68 |
| 2026-05-25 00:00 |
07:43:23.62 |
-27:33:55.5 |
HIP 37611 |
7.68 |
| 2026-05-25 12:00 |
07:43:26.82 |
-27:33:12.4 |
HIP 37611 |
8.68 |
| 2026-05-26 00:00 |
07:43:30.05 |
-27:32:29.8 |
HIP 37611 |
9.68 |
| 2026-05-26 12:00 |
07:43:33.32 |
-27:31:47.6 |
HIP 37611 |
10.68 |
| 2026-05-27 00:00 |
07:43:36.62 |
-27:31:05.8 |
HIP 37611 |
11.68 |
| 2026-05-27 12:00 |
07:43:39.95 |
-27:30:24.3 |
HIP 37611 |
12.68 |
| 2026-05-28 00:00 |
07:43:43.32 |
-27:29:43.3 |
HIP 37611 |
13.69 |
| 2026-05-28 12:00 |
07:43:46.72 |
-27:29:02.7 |
HIP 37715 |
14.63 |
| 2026-05-29 00:00 |
07:43:50.15 |
-27:28:22.5 |
HIP 37715 |
15.00 |
| 2026-05-29 12:00 |
07:43:53.61 |
-27:27:42.8 |
HIP 37715 |
15.41 |
| 2026-05-30 00:00 |
07:43:57.11 |
-27:27:03.4 |
HIP 37715 |
15.88 |
| 2026-05-30 12:00 |
07:44:00.63 |
-27:26:24.4 |
HIP 37715 |
16.38 |
| 2026-05-31 00:00 |
07:44:04.19 |
-27:25:45.9 |
HIP 37646 |
16.61 |
| 2026-05-31 12:00 |
07:44:07.78 |
-27:25:07.8 |
HIP 37646 |
16.41 |
| 2026-06-01 00:00 |
07:44:11.40 |
-27:24:30.1 |
HIP 37646 |
16.28 |
| 2026-06-01 12:00 |
07:44:15.05 |
-27:23:52.8 |
HIP 37646 |
16.22 |
| 2026-06-02 00:00 |
07:44:18.74 |
-27:23:15.9 |
HIP 37646 |
16.24 |