| Parameter |
Value |
| Designation |
C/2016 T3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-09-06T23:30:05.921280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:27Z |
| Obs used |
436 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-06-25.0000000 |
| e |
0.98138749 |
| q (au) |
2.649481 |
| a (au) |
142.349476 |
| i (deg) |
22.675960 |
| Ω (om, deg) |
271.748362 |
| ω (w, deg) |
194.677924 |
| M (ma, deg) |
359.957068 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.344 + 2.067\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.344 |
| n |
2.067 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2016-10-10 |
2017-09-06 |
+7.4124 |
-4.382 |
| 2017-09-17 |
2018-04-18 |
+5.6541 |
-2.485 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
16:17:26.49 |
-31:28:08.5 |
HIP 79873 |
13.19 |
| 2026-06-01 12:00 |
16:17:20.53 |
-31:27:50.8 |
HIP 79873 |
14.35 |
| 2026-06-02 00:00 |
16:17:14.58 |
-31:27:33.0 |
HIP 79873 |
15.54 |
| 2026-06-02 12:00 |
16:17:08.64 |
-31:27:15.0 |
HIP 79873 |
16.75 |
| 2026-06-03 00:00 |
16:17:02.71 |
-31:26:56.9 |
HIP 79873 |
17.97 |
| 2026-06-03 12:00 |
16:16:56.78 |
-31:26:38.7 |
HIP 79873 |
19.20 |
| 2026-06-04 00:00 |
16:16:50.87 |
-31:26:20.4 |
HIP 79860 |
20.39 |
| 2026-06-04 12:00 |
16:16:44.96 |
-31:26:01.9 |
HIP 79860 |
21.57 |
| 2026-06-05 00:00 |
16:16:39.06 |
-31:25:43.3 |
HIP 79860 |
22.76 |
| 2026-06-05 12:00 |
16:16:33.17 |
-31:25:24.6 |
HIP 79860 |
23.97 |
| 2026-06-06 00:00 |
16:16:27.29 |
-31:25:05.7 |
HIP 79860 |
25.18 |
| 2026-06-06 12:00 |
16:16:21.43 |
-31:24:46.8 |
HIP 79860 |
26.40 |
| 2026-06-07 00:00 |
16:16:15.57 |
-31:24:27.7 |
HIP 79860 |
27.62 |
| 2026-06-07 12:00 |
16:16:09.73 |
-31:24:08.5 |
HIP 79860 |
28.85 |
| 2026-06-08 00:00 |
16:16:03.90 |
-31:23:49.2 |
HIP 79578 |
28.70 |
| 2026-06-08 12:00 |
16:15:58.08 |
-31:23:29.8 |
HIP 79578 |
27.86 |
| 2026-06-09 00:00 |
16:15:52.28 |
-31:23:10.2 |
HIP 79578 |
27.07 |
| 2026-06-09 12:00 |
16:15:46.49 |
-31:22:50.6 |
HIP 79578 |
26.32 |
| 2026-06-10 00:00 |
16:15:40.72 |
-31:22:30.8 |
HIP 79578 |
25.61 |
| 2026-06-10 12:00 |
16:15:34.96 |
-31:22:11.0 |
HIP 79578 |
24.95 |
| 2026-06-11 00:00 |
16:15:29.22 |
-31:21:51.0 |
HIP 79578 |
24.34 |
| 2026-06-11 12:00 |
16:15:23.49 |
-31:21:30.9 |
HIP 79578 |
23.79 |
| 2026-06-12 00:00 |
16:15:17.78 |
-31:21:10.8 |
HIP 79578 |
23.30 |
| 2026-06-12 12:00 |
16:15:12.09 |
-31:20:50.5 |
HIP 79578 |
22.87 |
| 2026-06-13 00:00 |
16:15:06.41 |
-31:20:30.1 |
HIP 79578 |
22.50 |
| 2026-06-13 12:00 |
16:15:00.76 |
-31:20:09.7 |
HIP 79578 |
22.21 |
| 2026-06-14 00:00 |
16:14:55.12 |
-31:19:49.1 |
HIP 79578 |
21.98 |
| 2026-06-14 12:00 |
16:14:49.51 |
-31:19:28.5 |
HIP 79578 |
21.83 |
| 2026-06-15 00:00 |
16:14:43.91 |
-31:19:07.7 |
HIP 79578 |
21.75 |
| 2026-06-15 12:00 |
16:14:38.33 |
-31:18:46.9 |
HIP 79578 |
21.74 |
| 2026-06-16 00:00 |
16:14:32.78 |
-31:18:26.0 |
HIP 79578 |
21.80 |
| 2026-06-16 12:00 |
16:14:27.25 |
-31:18:05.0 |
HIP 79578 |
21.94 |
| 2026-06-17 00:00 |
16:14:21.74 |
-31:17:43.9 |
HIP 79578 |
22.15 |
| 2026-06-17 12:00 |
16:14:16.25 |
-31:17:22.7 |
HIP 79578 |
22.42 |
| 2026-06-18 00:00 |
16:14:10.79 |
-31:17:01.5 |
HIP 79578 |
22.76 |
| 2026-06-18 12:00 |
16:14:05.35 |
-31:16:40.2 |
HIP 79578 |
23.16 |
| 2026-06-19 00:00 |
16:13:59.93 |
-31:16:18.8 |
HIP 79578 |
23.61 |
| 2026-06-19 12:00 |
16:13:54.54 |
-31:15:57.3 |
HIP 79578 |
24.12 |
| 2026-06-20 00:00 |
16:13:49.17 |
-31:15:35.8 |
HIP 79578 |
24.67 |
| 2026-06-20 12:00 |
16:13:43.83 |
-31:15:14.2 |
HIP 79578 |
25.27 |
| 2026-06-21 00:00 |
16:13:38.52 |
-31:14:52.5 |
HIP 79578 |
25.91 |
| 2026-06-21 12:00 |
16:13:33.23 |
-31:14:30.7 |
HIP 79578 |
26.59 |
| 2026-06-22 00:00 |
16:13:27.97 |
-31:14:08.9 |
HIP 79454 |
27.26 |