| Parameter |
Value |
| Designation |
C/2014 R3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-08T05:34:28.655040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:59Z |
| Obs used |
830 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
8.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-04-03.0000000 |
| e |
0.99948030 |
| q (au) |
7.275646 |
| a (au) |
13999.773040 |
| i (deg) |
90.839681 |
| Ω (om, deg) |
334.108495 |
| ω (w, deg) |
113.426046 |
| M (ma, deg) |
0.000141 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.083 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.083 |
| n |
6.000 |
| gf |
0.858 |
| gb |
-0.825 |
| k |
0.809 |
| δ90 |
9.997 |
| 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 |
| 2014-09-06 |
2016-08-05 |
+27.2337 |
-23.512 |
| 2016-08-10 |
2020-02-27 |
+1.4894 |
-1.473 |
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 |
09:15:27.42 |
-26:26:32.6 |
HIP 45331 |
20.84 |
| 2026-07-29 12:00 |
09:15:32.56 |
-26:26:54.4 |
HIP 45331 |
21.93 |
| 2026-07-30 00:00 |
09:15:37.71 |
-26:27:16.6 |
HIP 45331 |
23.03 |
| 2026-07-30 12:00 |
09:15:42.87 |
-26:27:39.3 |
HIP 45331 |
24.16 |
| 2026-07-31 00:00 |
09:15:48.03 |
-26:28:02.4 |
HIP 45331 |
25.29 |
| 2026-07-31 12:00 |
09:15:53.20 |
-26:28:26.0 |
HIP 45331 |
26.44 |
| 2026-08-01 00:00 |
09:15:58.37 |
-26:28:50.1 |
HIP 45331 |
27.60 |
| 2026-08-01 12:00 |
09:16:03.55 |
-26:29:14.6 |
HIP 45331 |
28.78 |
| 2026-08-02 00:00 |
09:16:08.73 |
-26:29:39.5 |
HIP 45331 |
29.96 |
| 2026-08-02 12:00 |
09:16:13.92 |
-26:30:04.9 |
HIP 45331 |
31.15 |
| 2026-08-03 00:00 |
09:16:19.12 |
-26:30:30.7 |
HIP 45331 |
32.35 |
| 2026-08-03 12:00 |
09:16:24.31 |
-26:30:57.0 |
HIP 45331 |
33.56 |
| 2026-08-04 00:00 |
09:16:29.51 |
-26:31:23.7 |
HIP 45331 |
34.77 |
| 2026-08-04 12:00 |
09:16:34.72 |
-26:31:50.9 |
HIP 45331 |
35.99 |
| 2026-08-05 00:00 |
09:16:39.93 |
-26:32:18.5 |
HIP 45708 |
36.50 |
| 2026-08-05 12:00 |
09:16:45.14 |
-26:32:46.5 |
HIP 45708 |
35.67 |
| 2026-08-06 00:00 |
09:16:50.35 |
-26:33:15.0 |
HIP 45708 |
34.88 |
| 2026-08-06 12:00 |
09:16:55.56 |
-26:33:44.0 |
HIP 45708 |
34.11 |
| 2026-08-07 00:00 |
09:17:00.78 |
-26:34:13.4 |
HIP 45708 |
33.39 |
| 2026-08-07 12:00 |
09:17:06.00 |
-26:34:43.2 |
HIP 45708 |
32.69 |
| 2026-08-08 00:00 |
09:17:11.21 |
-26:35:13.5 |
HIP 45708 |
32.04 |
| 2026-08-08 12:00 |
09:17:16.43 |
-26:35:44.2 |
HIP 45708 |
31.43 |
| 2026-08-09 00:00 |
09:17:21.65 |
-26:36:15.3 |
HIP 45708 |
30.87 |
| 2026-08-09 12:00 |
09:17:26.87 |
-26:36:46.9 |
HIP 45708 |
30.35 |
| 2026-08-10 00:00 |
09:17:32.09 |
-26:37:18.9 |
HIP 45708 |
29.89 |
| 2026-08-10 12:00 |
09:17:37.31 |
-26:37:51.4 |
HIP 45708 |
29.48 |
| 2026-08-11 00:00 |
09:17:42.52 |
-26:38:24.3 |
HIP 45708 |
29.13 |
| 2026-08-11 12:00 |
09:17:47.74 |
-26:38:57.6 |
HIP 45708 |
28.84 |
| 2026-08-12 00:00 |
09:17:52.95 |
-26:39:31.4 |
HIP 45708 |
28.61 |
| 2026-08-12 12:00 |
09:17:58.16 |
-26:40:05.6 |
HIP 45708 |
28.44 |
| 2026-08-13 00:00 |
09:18:03.37 |
-26:40:40.2 |
HIP 45780 |
27.24 |
| 2026-08-13 12:00 |
09:18:08.57 |
-26:41:15.2 |
HIP 45780 |
26.03 |
| 2026-08-14 00:00 |
09:18:13.77 |
-26:41:50.7 |
HIP 45780 |
24.83 |
| 2026-08-14 12:00 |
09:18:18.97 |
-26:42:26.6 |
HIP 45780 |
23.64 |
| 2026-08-15 00:00 |
09:18:24.16 |
-26:43:02.9 |
HIP 45780 |
22.46 |
| 2026-08-15 12:00 |
09:18:29.35 |
-26:43:39.7 |
HIP 45780 |
21.31 |
| 2026-08-16 00:00 |
09:18:34.53 |
-26:44:16.9 |
HIP 45780 |
20.17 |
| 2026-08-16 12:00 |
09:18:39.71 |
-26:44:54.4 |
HIP 45780 |
19.06 |
| 2026-08-17 00:00 |
09:18:44.88 |
-26:45:32.4 |
HIP 45780 |
17.97 |
| 2026-08-17 12:00 |
09:18:50.05 |
-26:46:10.9 |
HIP 45780 |
16.93 |
| 2026-08-18 00:00 |
09:18:55.21 |
-26:46:49.7 |
HIP 45780 |
15.92 |
| 2026-08-18 12:00 |
09:19:00.36 |
-26:47:28.9 |
HIP 45780 |
14.97 |
| 2026-08-19 00:00 |
09:19:05.50 |
-26:48:08.6 |
HIP 45786 |
14.06 |