| Parameter |
Value |
| Designation |
C/2014 W11 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-06-17T08:54:15.324480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:04Z |
| Obs used |
1038 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
6.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-06-01.0000000 |
| e |
0.65023088 |
| q (au) |
3.426807 |
| a (au) |
9.797339 |
| i (deg) |
12.706625 |
| Ω (om, deg) |
295.942382 |
| ω (w, deg) |
225.644803 |
| M (ma, deg) |
359.473841 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.093 + 3.562\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.093 |
| n |
3.562 |
| 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 |
| 2014-10-22 |
2015-06-12 |
+82.2821 |
-44.843 |
| 2015-06-27 |
2017-05-27 |
+12.3719 |
-7.898 |
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 |
21:56:58.40 |
-00:16:39.7 |
HIP 108406 |
23.63 |
| 2026-06-01 12:00 |
21:56:57.78 |
-00:16:11.6 |
HIP 108406 |
24.12 |
| 2026-06-02 00:00 |
21:56:57.09 |
-00:15:43.8 |
HIP 108406 |
24.61 |
| 2026-06-02 12:00 |
21:56:56.34 |
-00:15:16.4 |
HIP 108406 |
25.10 |
| 2026-06-03 00:00 |
21:56:55.53 |
-00:14:49.3 |
HIP 108406 |
25.60 |
| 2026-06-03 12:00 |
21:56:54.65 |
-00:14:22.7 |
HIP 108406 |
26.10 |
| 2026-06-04 00:00 |
21:56:53.71 |
-00:13:56.3 |
HIP 108406 |
26.59 |
| 2026-06-04 12:00 |
21:56:52.71 |
-00:13:30.3 |
HIP 108406 |
27.09 |
| 2026-06-05 00:00 |
21:56:51.64 |
-00:13:04.7 |
HIP 108406 |
27.59 |
| 2026-06-05 12:00 |
21:56:50.51 |
-00:12:39.5 |
HIP 108406 |
28.10 |
| 2026-06-06 00:00 |
21:56:49.32 |
-00:12:14.6 |
HIP 108406 |
28.60 |
| 2026-06-06 12:00 |
21:56:48.07 |
-00:11:50.1 |
HIP 108406 |
29.11 |
| 2026-06-07 00:00 |
21:56:46.75 |
-00:11:25.9 |
HIP 108406 |
29.62 |
| 2026-06-07 12:00 |
21:56:45.37 |
-00:11:02.2 |
HIP 108406 |
30.13 |
| 2026-06-08 00:00 |
21:56:43.93 |
-00:10:38.8 |
HIP 108299 |
30.49 |
| 2026-06-08 12:00 |
21:56:42.43 |
-00:10:15.7 |
HIP 108299 |
30.81 |
| 2026-06-09 00:00 |
21:56:40.86 |
-00:09:53.1 |
HIP 108253 |
30.45 |
| 2026-06-09 12:00 |
21:56:39.24 |
-00:09:30.8 |
HIP 108253 |
29.94 |
| 2026-06-10 00:00 |
21:56:37.55 |
-00:09:08.9 |
HIP 108253 |
29.44 |
| 2026-06-10 12:00 |
21:56:35.79 |
-00:08:47.4 |
HIP 108253 |
28.94 |
| 2026-06-11 00:00 |
21:56:33.98 |
-00:08:26.3 |
HIP 108253 |
28.45 |
| 2026-06-11 12:00 |
21:56:32.10 |
-00:08:05.5 |
HIP 108253 |
27.96 |
| 2026-06-12 00:00 |
21:56:30.16 |
-00:07:45.2 |
HIP 108253 |
27.47 |
| 2026-06-12 12:00 |
21:56:28.16 |
-00:07:25.2 |
HIP 108253 |
26.98 |
| 2026-06-13 00:00 |
21:56:26.10 |
-00:07:05.6 |
HIP 108253 |
26.51 |
| 2026-06-13 12:00 |
21:56:23.98 |
-00:06:46.4 |
HIP 108253 |
26.04 |
| 2026-06-14 00:00 |
21:56:21.79 |
-00:06:27.6 |
HIP 108253 |
25.58 |
| 2026-06-14 12:00 |
21:56:19.55 |
-00:06:09.2 |
HIP 108253 |
25.12 |
| 2026-06-15 00:00 |
21:56:17.24 |
-00:05:51.2 |
HIP 108253 |
24.68 |
| 2026-06-15 12:00 |
21:56:14.87 |
-00:05:33.6 |
HIP 108253 |
24.25 |
| 2026-06-16 00:00 |
21:56:12.44 |
-00:05:16.4 |
HIP 108253 |
23.84 |
| 2026-06-16 12:00 |
21:56:09.95 |
-00:04:59.5 |
HIP 108253 |
23.44 |
| 2026-06-17 00:00 |
21:56:07.40 |
-00:04:43.1 |
HIP 108253 |
23.05 |
| 2026-06-17 12:00 |
21:56:04.79 |
-00:04:27.1 |
HIP 108253 |
22.69 |
| 2026-06-18 00:00 |
21:56:02.12 |
-00:04:11.4 |
HIP 108253 |
22.35 |
| 2026-06-18 12:00 |
21:55:59.40 |
-00:03:56.2 |
HIP 108253 |
22.03 |
| 2026-06-19 00:00 |
21:55:56.61 |
-00:03:41.4 |
HIP 108253 |
21.74 |
| 2026-06-19 12:00 |
21:55:53.76 |
-00:03:27.0 |
HIP 108253 |
21.47 |
| 2026-06-20 00:00 |
21:55:50.86 |
-00:03:12.9 |
HIP 108253 |
21.23 |
| 2026-06-20 12:00 |
21:55:47.89 |
-00:02:59.3 |
HIP 108253 |
21.03 |
| 2026-06-21 00:00 |
21:55:44.87 |
-00:02:46.1 |
HIP 108253 |
20.86 |
| 2026-06-21 12:00 |
21:55:41.79 |
-00:02:33.3 |
HIP 108253 |
20.73 |
| 2026-06-22 00:00 |
21:55:38.65 |
-00:02:20.8 |
HIP 108253 |
20.64 |