| 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) |
| 2026-05-12 00:00 |
09:14:37.51 |
-49:34:58.1 |
HIP 45250 |
14.69 |
| 2026-05-12 12:00 |
09:14:37.89 |
-49:33:53.8 |
HIP 45250 |
15.36 |
| 2026-05-13 00:00 |
09:14:38.34 |
-49:32:49.7 |
HIP 45250 |
16.08 |
| 2026-05-13 12:00 |
09:14:38.84 |
-49:31:45.7 |
HIP 45250 |
16.84 |
| 2026-05-14 00:00 |
09:14:39.42 |
-49:30:42.0 |
HIP 45250 |
17.64 |
| 2026-05-14 12:00 |
09:14:40.05 |
-49:29:38.4 |
HIP 45250 |
18.47 |
| 2026-05-15 00:00 |
09:14:40.76 |
-49:28:35.0 |
HIP 45250 |
19.33 |
| 2026-05-15 12:00 |
09:14:41.52 |
-49:27:31.8 |
HIP 45250 |
20.22 |
| 2026-05-16 00:00 |
09:14:42.36 |
-49:26:28.8 |
HIP 45522 |
20.81 |
| 2026-05-16 12:00 |
09:14:43.25 |
-49:25:26.0 |
HIP 45522 |
21.12 |
| 2026-05-17 00:00 |
09:14:44.21 |
-49:24:23.5 |
HIP 45533 |
21.19 |
| 2026-05-17 12:00 |
09:14:45.23 |
-49:23:21.1 |
HIP 45533 |
20.75 |
| 2026-05-18 00:00 |
09:14:46.32 |
-49:22:19.0 |
HIP 45533 |
20.34 |
| 2026-05-18 12:00 |
09:14:47.46 |
-49:21:17.1 |
HIP 45533 |
19.97 |
| 2026-05-19 00:00 |
09:14:48.67 |
-49:20:15.4 |
HIP 45264 |
19.32 |
| 2026-05-19 12:00 |
09:14:49.95 |
-49:19:14.0 |
HIP 45264 |
18.70 |
| 2026-05-20 00:00 |
09:14:51.28 |
-49:18:12.8 |
HIP 45264 |
18.13 |
| 2026-05-20 12:00 |
09:14:52.68 |
-49:17:11.9 |
HIP 45264 |
17.62 |
| 2026-05-21 00:00 |
09:14:54.14 |
-49:16:11.2 |
HIP 45264 |
17.16 |
| 2026-05-21 12:00 |
09:14:55.66 |
-49:15:10.8 |
HIP 45264 |
16.77 |
| 2026-05-22 00:00 |
09:14:57.24 |
-49:14:10.6 |
HIP 45264 |
16.45 |
| 2026-05-22 12:00 |
09:14:58.88 |
-49:13:10.7 |
HIP 45264 |
16.19 |
| 2026-05-23 00:00 |
09:15:00.58 |
-49:12:11.1 |
HIP 45264 |
16.01 |
| 2026-05-23 12:00 |
09:15:02.35 |
-49:11:11.7 |
HIP 45264 |
15.91 |
| 2026-05-24 00:00 |
09:15:04.17 |
-49:10:12.6 |
HIP 45264 |
15.88 |
| 2026-05-24 12:00 |
09:15:06.05 |
-49:09:13.8 |
HIP 45264 |
15.93 |
| 2026-05-25 00:00 |
09:15:07.99 |
-49:08:15.3 |
HIP 45264 |
16.06 |
| 2026-05-25 12:00 |
09:15:09.99 |
-49:07:17.1 |
HIP 45264 |
16.26 |
| 2026-05-26 00:00 |
09:15:12.05 |
-49:06:19.2 |
HIP 45264 |
16.53 |
| 2026-05-26 12:00 |
09:15:14.16 |
-49:05:21.5 |
HIP 45264 |
16.87 |
| 2026-05-27 00:00 |
09:15:16.34 |
-49:04:24.2 |
HIP 45264 |
17.27 |
| 2026-05-27 12:00 |
09:15:18.57 |
-49:03:27.2 |
HIP 45264 |
17.73 |
| 2026-05-28 00:00 |
09:15:20.86 |
-49:02:30.5 |
HIP 45264 |
18.24 |
| 2026-05-28 12:00 |
09:15:23.21 |
-49:01:34.1 |
HIP 45264 |
18.81 |
| 2026-05-29 00:00 |
09:15:25.61 |
-49:00:38.0 |
HIP 45264 |
19.42 |
| 2026-05-29 12:00 |
09:15:28.07 |
-48:59:42.2 |
HIP 45264 |
20.07 |
| 2026-05-30 00:00 |
09:15:30.58 |
-48:58:46.8 |
HIP 45264 |
20.75 |
| 2026-05-30 12:00 |
09:15:33.16 |
-48:57:51.6 |
HIP 45264 |
21.47 |
| 2026-05-31 00:00 |
09:15:35.78 |
-48:56:56.9 |
HIP 45264 |
22.21 |
| 2026-05-31 12:00 |
09:15:38.47 |
-48:56:02.4 |
HIP 45470 |
21.98 |
| 2026-06-01 00:00 |
09:15:41.20 |
-48:55:08.3 |
HIP 45470 |
21.03 |
| 2026-06-01 12:00 |
09:15:44.00 |
-48:54:14.5 |
HIP 45470 |
20.09 |
| 2026-06-02 00:00 |
09:15:46.84 |
-48:53:21.1 |
HIP 45470 |
19.16 |