C/2014 F3 (Sheppard-Trujillo)
| Parameter |
Value |
| Designation |
C/2014 F3 (Sheppard-Trujillo) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-05-18T09:14:56.149440Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:14Z |
| Obs used |
100 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-10.0000000 |
| e |
0.64217219 |
| q (au) |
5.704144 |
| a (au) |
15.941031 |
| i (deg) |
6.568810 |
| Ω (om, deg) |
326.803827 |
| ω (w, deg) |
2.927768 |
| M (ma, deg) |
356.122619 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.814 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.814 |
| n |
2.000 |
| gf |
0.887 |
| gb |
-0.936 |
| k |
1.000 |
| δ90 |
3.631 |
| 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 |
| 2014-03-26 |
2020-09-16 |
-6.4566 |
+5.035 |
| 2021-07-09 |
2024-11-25 |
-15.6318 |
+11.981 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:09:45.09 |
+27:42:23.5 |
HIP 19219 |
36.35 |
| 2026-02-03 12:00 |
04:09:44.46 |
+27:42:00.9 |
HIP 19382 |
36.03 |
| 2026-02-04 00:00 |
04:09:43.95 |
+27:41:38.6 |
HIP 19382 |
35.64 |
| 2026-02-04 12:00 |
04:09:43.55 |
+27:41:16.6 |
HIP 19382 |
35.26 |
| 2026-02-05 00:00 |
04:09:43.26 |
+27:40:54.8 |
HIP 19382 |
34.90 |
| 2026-02-05 12:00 |
04:09:43.08 |
+27:40:33.3 |
HIP 19382 |
34.54 |
| 2026-02-06 00:00 |
04:09:43.01 |
+27:40:12.1 |
HIP 19382 |
34.19 |
| 2026-02-06 12:00 |
04:09:43.05 |
+27:39:51.1 |
HIP 19382 |
33.85 |
| 2026-02-07 00:00 |
04:09:43.21 |
+27:39:30.3 |
HIP 19382 |
33.52 |
| 2026-02-07 12:00 |
04:09:43.48 |
+27:39:09.9 |
HIP 19382 |
33.21 |
| 2026-02-08 00:00 |
04:09:43.86 |
+27:38:49.7 |
HIP 19382 |
32.90 |
| 2026-02-08 12:00 |
04:09:44.35 |
+27:38:29.7 |
HIP 19382 |
32.61 |
| 2026-02-09 00:00 |
04:09:44.95 |
+27:38:10.1 |
HIP 19382 |
32.32 |
| 2026-02-09 12:00 |
04:09:45.66 |
+27:37:50.7 |
HIP 19382 |
32.05 |
| 2026-02-10 00:00 |
04:09:46.49 |
+27:37:31.6 |
HIP 19382 |
31.79 |
| 2026-02-10 12:00 |
04:09:47.43 |
+27:37:12.7 |
HIP 19382 |
31.55 |
| 2026-02-11 00:00 |
04:09:48.47 |
+27:36:54.2 |
HIP 19382 |
31.32 |
| 2026-02-11 12:00 |
04:09:49.63 |
+27:36:35.9 |
HIP 19382 |
31.11 |
| 2026-02-12 00:00 |
04:09:50.90 |
+27:36:17.9 |
HIP 19382 |
30.91 |
| 2026-02-12 12:00 |
04:09:52.29 |
+27:36:00.1 |
HIP 19382 |
30.72 |
| 2026-02-13 00:00 |
04:09:53.78 |
+27:35:42.7 |
HIP 19382 |
30.56 |
| 2026-02-13 12:00 |
04:09:55.38 |
+27:35:25.5 |
HIP 19382 |
30.41 |
| 2026-02-14 00:00 |
04:09:57.10 |
+27:35:08.6 |
HIP 19382 |
30.29 |
| 2026-02-14 12:00 |
04:09:58.92 |
+27:34:52.0 |
HIP 19382 |
30.18 |
| 2026-02-15 00:00 |
04:10:00.85 |
+27:34:35.7 |
HIP 19382 |
30.09 |
| 2026-02-15 12:00 |
04:10:02.90 |
+27:34:19.7 |
HIP 19382 |
30.03 |
| 2026-02-16 00:00 |
04:10:05.06 |
+27:34:03.9 |
HIP 19382 |
29.99 |
| 2026-02-16 12:00 |
04:10:07.32 |
+27:33:48.5 |
HIP 19382 |
29.98 |
| 2026-02-17 00:00 |
04:10:09.70 |
+27:33:33.3 |
HIP 19382 |
29.99 |
| 2026-02-17 12:00 |
04:10:12.18 |
+27:33:18.4 |
HIP 19382 |
30.04 |
| 2026-02-18 00:00 |
04:10:14.77 |
+27:33:03.8 |
HIP 19382 |
30.10 |
| 2026-02-18 12:00 |
04:10:17.48 |
+27:32:49.5 |
HIP 19382 |
30.20 |
| 2026-02-19 00:00 |
04:10:20.29 |
+27:32:35.5 |
HIP 19382 |
30.33 |
| 2026-02-19 12:00 |
04:10:23.21 |
+27:32:21.8 |
HIP 19382 |
30.49 |
| 2026-02-20 00:00 |
04:10:26.23 |
+27:32:08.4 |
HIP 19382 |
30.68 |
| 2026-02-20 12:00 |
04:10:29.37 |
+27:31:55.2 |
HIP 19592 |
30.14 |
| 2026-02-21 00:00 |
04:10:32.61 |
+27:31:42.4 |
HIP 19592 |
29.52 |
| 2026-02-21 12:00 |
04:10:35.96 |
+27:31:29.9 |
HIP 19592 |
28.89 |
| 2026-02-22 00:00 |
04:10:39.42 |
+27:31:17.6 |
HIP 19592 |
28.26 |
| 2026-02-22 12:00 |
04:10:42.98 |
+27:31:05.6 |
HIP 19592 |
27.63 |
| 2026-02-23 00:00 |
04:10:46.65 |
+27:30:54.0 |
HIP 19592 |
27.00 |
| 2026-02-23 12:00 |
04:10:50.43 |
+27:30:42.6 |
HIP 19592 |
26.37 |
| 2026-02-24 00:00 |
04:10:54.31 |
+27:30:31.5 |
HIP 19592 |
25.75 |