| 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 |
-0.878 |
| 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) |
| 2026-03-26 00:00 |
09:19:01.76 |
-51:15:17.7 |
HIP 45631 |
15.05 |
| 2026-03-26 12:00 |
09:18:55.92 |
-51:14:22.3 |
HIP 45631 |
13.77 |
| 2026-03-27 00:00 |
09:18:50.14 |
-51:13:26.6 |
HIP 45631 |
12.50 |
| 2026-03-27 12:00 |
09:18:44.42 |
-51:12:30.6 |
HIP 45631 |
11.22 |
| 2026-03-28 00:00 |
09:18:38.75 |
-51:11:34.2 |
HIP 45631 |
9.96 |
| 2026-03-28 12:00 |
09:18:33.15 |
-51:10:37.4 |
HIP 45631 |
8.70 |
| 2026-03-29 00:00 |
09:18:27.61 |
-51:09:40.3 |
HIP 45631 |
7.45 |
| 2026-03-29 12:00 |
09:18:22.13 |
-51:08:42.9 |
HIP 45631 |
6.21 |
| 2026-03-30 00:00 |
09:18:16.71 |
-51:07:45.2 |
HIP 45631 |
5.00 |
| 2026-03-30 12:00 |
09:18:11.35 |
-51:06:47.1 |
HIP 45631 |
3.83 |
| 2026-03-31 00:00 |
09:18:06.05 |
-51:05:48.7 |
HIP 45631 |
2.76 |
| 2026-03-31 12:00 |
09:18:00.81 |
-51:04:49.9 |
HIP 45631 |
1.95 |
| 2026-04-01 00:00 |
09:17:55.63 |
-51:03:50.9 |
HIP 45631 |
1.80 |
| 2026-04-01 12:00 |
09:17:50.52 |
-51:02:51.6 |
HIP 45631 |
2.42 |
| 2026-04-02 00:00 |
09:17:45.47 |
-51:01:51.9 |
HIP 45631 |
3.42 |
| 2026-04-02 12:00 |
09:17:40.48 |
-51:00:52.0 |
HIP 45631 |
4.55 |
| 2026-04-03 00:00 |
09:17:35.55 |
-50:59:51.8 |
HIP 45631 |
5.74 |
| 2026-04-03 12:00 |
09:17:30.69 |
-50:58:51.3 |
HIP 45631 |
6.95 |
| 2026-04-04 00:00 |
09:17:25.89 |
-50:57:50.5 |
HIP 45631 |
8.17 |
| 2026-04-04 12:00 |
09:17:21.16 |
-50:56:49.5 |
HIP 45631 |
9.40 |
| 2026-04-05 00:00 |
09:17:16.48 |
-50:55:48.2 |
HIP 45631 |
10.63 |
| 2026-04-05 12:00 |
09:17:11.88 |
-50:54:46.7 |
HIP 45631 |
11.86 |
| 2026-04-06 00:00 |
09:17:07.33 |
-50:53:44.8 |
HIP 45631 |
13.10 |
| 2026-04-06 12:00 |
09:17:02.85 |
-50:52:42.8 |
HIP 45631 |
14.33 |
| 2026-04-07 00:00 |
09:16:58.44 |
-50:51:40.5 |
HIP 45631 |
15.57 |
| 2026-04-07 12:00 |
09:16:54.09 |
-50:50:37.9 |
HIP 45631 |
16.80 |
| 2026-04-08 00:00 |
09:16:49.81 |
-50:49:35.2 |
HIP 45631 |
18.03 |
| 2026-04-08 12:00 |
09:16:45.59 |
-50:48:32.2 |
HIP 45631 |
19.26 |
| 2026-04-09 00:00 |
09:16:41.44 |
-50:47:29.0 |
HIP 45631 |
20.48 |
| 2026-04-09 12:00 |
09:16:37.35 |
-50:46:25.6 |
HIP 45631 |
21.71 |
| 2026-04-10 00:00 |
09:16:33.33 |
-50:45:21.9 |
HIP 45631 |
22.93 |
| 2026-04-10 12:00 |
09:16:29.38 |
-50:44:18.1 |
HIP 45308 |
24.04 |
| 2026-04-11 00:00 |
09:16:25.49 |
-50:43:14.1 |
HIP 45308 |
23.13 |
| 2026-04-11 12:00 |
09:16:21.67 |
-50:42:09.9 |
HIP 45308 |
22.26 |
| 2026-04-12 00:00 |
09:16:17.91 |
-50:41:05.5 |
HIP 45308 |
21.43 |
| 2026-04-12 12:00 |
09:16:14.23 |
-50:40:00.9 |
HIP 45308 |
20.66 |
| 2026-04-13 00:00 |
09:16:10.61 |
-50:38:56.2 |
HIP 45308 |
19.94 |
| 2026-04-13 12:00 |
09:16:07.06 |
-50:37:51.3 |
HIP 45308 |
19.28 |
| 2026-04-14 00:00 |
09:16:03.57 |
-50:36:46.2 |
HIP 45308 |
18.69 |
| 2026-04-14 12:00 |
09:16:00.16 |
-50:35:41.0 |
HIP 45308 |
18.17 |
| 2026-04-15 00:00 |
09:15:56.81 |
-50:34:35.6 |
HIP 45308 |
17.73 |
| 2026-04-15 12:00 |
09:15:53.53 |
-50:33:30.1 |
HIP 45308 |
17.37 |
| 2026-04-16 00:00 |
09:15:50.32 |
-50:32:24.5 |
HIP 45308 |
17.10 |