| Parameter |
Value |
| Designation |
C/2014 S3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-13T07:42:24.215040Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-10-08.0000000 |
| e |
0.97675738 |
| q (au) |
2.049265 |
| a (au) |
88.168442 |
| i (deg) |
169.320625 |
| Ω (om, deg) |
356.051072 |
| ω (w, deg) |
293.142060 |
| M (ma, deg) |
0.066286 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.884 + 3.181\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.884 |
| n |
3.181 |
| gf |
0.984 |
| gb |
-0.557 |
| k |
0.999 |
| δ90 |
9.807 |
| 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) |
| 2026-09-20 00:00 |
18:02:12.38 |
-12:47:55.4 |
HIP 88301 |
21.27 |
| 2026-09-20 12:00 |
18:02:11.87 |
-12:48:07.6 |
HIP 88301 |
21.04 |
| 2026-09-21 00:00 |
18:02:11.40 |
-12:48:19.8 |
HIP 88301 |
20.82 |
| 2026-09-21 12:00 |
18:02:10.96 |
-12:48:32.0 |
HIP 88301 |
20.60 |
| 2026-09-22 00:00 |
18:02:10.57 |
-12:48:44.2 |
HIP 88301 |
20.39 |
| 2026-09-22 12:00 |
18:02:10.21 |
-12:48:56.4 |
HIP 88301 |
20.17 |
| 2026-09-23 00:00 |
18:02:09.89 |
-12:49:08.6 |
HIP 88301 |
19.96 |
| 2026-09-23 12:00 |
18:02:09.61 |
-12:49:20.7 |
HIP 88301 |
19.75 |
| 2026-09-24 00:00 |
18:02:09.37 |
-12:49:32.9 |
HIP 88301 |
19.54 |
| 2026-09-24 12:00 |
18:02:09.17 |
-12:49:45.0 |
HIP 88301 |
19.33 |
| 2026-09-25 00:00 |
18:02:09.01 |
-12:49:57.1 |
HIP 88301 |
19.13 |
| 2026-09-25 12:00 |
18:02:08.89 |
-12:50:09.2 |
HIP 88301 |
18.92 |
| 2026-09-26 00:00 |
18:02:08.80 |
-12:50:21.3 |
HIP 88301 |
18.72 |
| 2026-09-26 12:00 |
18:02:08.76 |
-12:50:33.4 |
HIP 88301 |
18.52 |
| 2026-09-27 00:00 |
18:02:08.75 |
-12:50:45.5 |
HIP 88301 |
18.32 |
| 2026-09-27 12:00 |
18:02:08.78 |
-12:50:57.5 |
HIP 88301 |
18.12 |
| 2026-09-28 00:00 |
18:02:08.85 |
-12:51:09.6 |
HIP 88301 |
17.93 |
| 2026-09-28 12:00 |
18:02:08.96 |
-12:51:21.6 |
HIP 88301 |
17.74 |
| 2026-09-29 00:00 |
18:02:09.11 |
-12:51:33.6 |
HIP 88301 |
17.55 |
| 2026-09-29 12:00 |
18:02:09.29 |
-12:51:45.6 |
HIP 88301 |
17.36 |
| 2026-09-30 00:00 |
18:02:09.51 |
-12:51:57.5 |
HIP 88301 |
17.17 |
| 2026-09-30 12:00 |
18:02:09.78 |
-12:52:09.4 |
HIP 88301 |
16.99 |
| 2026-10-01 00:00 |
18:02:10.08 |
-12:52:21.4 |
HIP 88301 |
16.81 |
| 2026-10-01 12:00 |
18:02:10.41 |
-12:52:33.2 |
HIP 88301 |
16.63 |
| 2026-10-02 00:00 |
18:02:10.79 |
-12:52:45.1 |
HIP 88301 |
16.45 |
| 2026-10-02 12:00 |
18:02:11.20 |
-12:52:56.9 |
HIP 88301 |
16.28 |
| 2026-10-03 00:00 |
18:02:11.66 |
-12:53:08.8 |
HIP 88301 |
16.12 |
| 2026-10-03 12:00 |
18:02:12.15 |
-12:53:20.5 |
HIP 88301 |
15.95 |
| 2026-10-04 00:00 |
18:02:12.67 |
-12:53:32.3 |
HIP 88301 |
15.79 |
| 2026-10-04 12:00 |
18:02:13.24 |
-12:53:44.0 |
HIP 88301 |
15.64 |
| 2026-10-05 00:00 |
18:02:13.84 |
-12:53:55.7 |
HIP 88301 |
15.49 |
| 2026-10-05 12:00 |
18:02:14.49 |
-12:54:07.4 |
HIP 88301 |
15.35 |
| 2026-10-06 00:00 |
18:02:15.17 |
-12:54:19.0 |
HIP 88301 |
15.21 |
| 2026-10-06 12:00 |
18:02:15.88 |
-12:54:30.6 |
HIP 88301 |
15.08 |
| 2026-10-07 00:00 |
18:02:16.64 |
-12:54:42.2 |
HIP 88301 |
14.95 |
| 2026-10-07 12:00 |
18:02:17.43 |
-12:54:53.8 |
HIP 88301 |
14.84 |
| 2026-10-08 00:00 |
18:02:18.26 |
-12:55:05.3 |
HIP 88301 |
14.73 |
| 2026-10-08 12:00 |
18:02:19.12 |
-12:55:16.7 |
HIP 88301 |
14.63 |
| 2026-10-09 00:00 |
18:02:20.03 |
-12:55:28.2 |
HIP 88301 |
14.54 |
| 2026-10-09 12:00 |
18:02:20.97 |
-12:55:39.6 |
HIP 88301 |
14.45 |
| 2026-10-10 00:00 |
18:02:21.95 |
-12:55:50.9 |
HIP 88301 |
14.38 |
| 2026-10-10 12:00 |
18:02:22.96 |
-12:56:02.2 |
HIP 88301 |
14.32 |
| 2026-10-11 00:00 |
18:02:24.01 |
-12:56:13.5 |
HIP 88301 |
14.27 |