| 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) |
| 2026-07-29 00:00 |
16:08:39.99 |
-30:46:30.1 |
HIP 79029 |
14.71 |
| 2026-07-29 12:00 |
16:08:37.76 |
-30:46:08.9 |
HIP 79029 |
14.12 |
| 2026-07-30 00:00 |
16:08:35.58 |
-30:45:47.7 |
HIP 79029 |
13.54 |
| 2026-07-30 12:00 |
16:08:33.45 |
-30:45:26.6 |
HIP 79029 |
12.96 |
| 2026-07-31 00:00 |
16:08:31.38 |
-30:45:05.5 |
HIP 79029 |
12.40 |
| 2026-07-31 12:00 |
16:08:29.35 |
-30:44:44.6 |
HIP 79029 |
11.84 |
| 2026-08-01 00:00 |
16:08:27.37 |
-30:44:23.7 |
HIP 79029 |
11.29 |
| 2026-08-01 12:00 |
16:08:25.44 |
-30:44:02.9 |
HIP 79029 |
10.75 |
| 2026-08-02 00:00 |
16:08:23.56 |
-30:43:42.2 |
HIP 79029 |
10.22 |
| 2026-08-02 12:00 |
16:08:21.74 |
-30:43:21.6 |
HIP 79029 |
9.70 |
| 2026-08-03 00:00 |
16:08:19.96 |
-30:43:01.1 |
HIP 79029 |
9.19 |
| 2026-08-03 12:00 |
16:08:18.24 |
-30:42:40.6 |
HIP 79029 |
8.69 |
| 2026-08-04 00:00 |
16:08:16.56 |
-30:42:20.3 |
HIP 79029 |
8.19 |
| 2026-08-04 12:00 |
16:08:14.94 |
-30:42:00.0 |
HIP 79029 |
7.71 |
| 2026-08-05 00:00 |
16:08:13.37 |
-30:41:39.8 |
HIP 79029 |
7.23 |
| 2026-08-05 12:00 |
16:08:11.85 |
-30:41:19.8 |
HIP 79029 |
6.76 |
| 2026-08-06 00:00 |
16:08:10.38 |
-30:40:59.8 |
HIP 79029 |
6.30 |
| 2026-08-06 12:00 |
16:08:08.97 |
-30:40:39.9 |
HIP 79029 |
5.86 |
| 2026-08-07 00:00 |
16:08:07.60 |
-30:40:20.1 |
HIP 79029 |
5.42 |
| 2026-08-07 12:00 |
16:08:06.29 |
-30:40:00.4 |
HIP 79029 |
4.99 |
| 2026-08-08 00:00 |
16:08:05.03 |
-30:39:40.8 |
HIP 79029 |
4.56 |
| 2026-08-08 12:00 |
16:08:03.83 |
-30:39:21.3 |
HIP 79029 |
4.15 |
| 2026-08-09 00:00 |
16:08:02.67 |
-30:39:02.0 |
HIP 79029 |
3.76 |
| 2026-08-09 12:00 |
16:08:01.57 |
-30:38:42.7 |
HIP 79029 |
3.37 |
| 2026-08-10 00:00 |
16:08:00.52 |
-30:38:23.5 |
HIP 79029 |
2.99 |
| 2026-08-10 12:00 |
16:07:59.52 |
-30:38:04.5 |
HIP 79029 |
2.63 |
| 2026-08-11 00:00 |
16:07:58.58 |
-30:37:45.5 |
HIP 79029 |
2.29 |
| 2026-08-11 12:00 |
16:07:57.68 |
-30:37:26.7 |
HIP 79029 |
1.98 |
| 2026-08-12 00:00 |
16:07:56.85 |
-30:37:07.9 |
HIP 79029 |
1.69 |
| 2026-08-12 12:00 |
16:07:56.06 |
-30:36:49.3 |
HIP 79029 |
1.46 |
| 2026-08-13 00:00 |
16:07:55.33 |
-30:36:30.8 |
HIP 79029 |
1.28 |
| 2026-08-13 12:00 |
16:07:54.65 |
-30:36:12.4 |
HIP 79029 |
1.20 |
| 2026-08-14 00:00 |
16:07:54.02 |
-30:35:54.1 |
HIP 79029 |
1.22 |
| 2026-08-14 12:00 |
16:07:53.45 |
-30:35:36.0 |
HIP 79029 |
1.33 |
| 2026-08-15 00:00 |
16:07:52.93 |
-30:35:18.0 |
HIP 79029 |
1.51 |
| 2026-08-15 12:00 |
16:07:52.46 |
-30:35:00.0 |
HIP 79029 |
1.73 |
| 2026-08-16 00:00 |
16:07:52.05 |
-30:34:42.2 |
HIP 79029 |
1.98 |
| 2026-08-16 12:00 |
16:07:51.69 |
-30:34:24.6 |
HIP 79029 |
2.25 |
| 2026-08-17 00:00 |
16:07:51.38 |
-30:34:07.0 |
HIP 79029 |
2.52 |
| 2026-08-17 12:00 |
16:07:51.12 |
-30:33:49.6 |
HIP 79012 |
2.61 |
| 2026-08-18 00:00 |
16:07:50.92 |
-30:33:32.3 |
HIP 79012 |
2.58 |
| 2026-08-18 12:00 |
16:07:50.77 |
-30:33:15.1 |
HIP 79012 |
2.59 |
| 2026-08-19 00:00 |
16:07:50.68 |
-30:32:58.1 |
HIP 79012 |
2.64 |