C/2014 W5 (Lemmon-PANSTARRS)
| Parameter |
Value |
| Designation |
C/2014 W5 (Lemmon-PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-02-10T14:39:44.758080Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-02-12.0000000 |
| e |
0.97912661 |
| q (au) |
2.398527 |
| a (au) |
114.908335 |
| i (deg) |
145.492823 |
| Ω (om, deg) |
245.338804 |
| ω (w, deg) |
281.258140 |
| M (ma, deg) |
359.709053 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.915 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.915 |
| n |
2.000 |
| gf |
0.978 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
9.998 |
| 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) |
| 2026-02-03 00:00 |
13:16:40.50 |
+26:33:00.2 |
HIP 64907 |
26.13 |
| 2026-02-03 12:00 |
13:16:37.92 |
+26:33:56.3 |
HIP 64907 |
27.15 |
| 2026-02-04 00:00 |
13:16:35.30 |
+26:34:52.4 |
HIP 64907 |
28.18 |
| 2026-02-04 12:00 |
13:16:32.63 |
+26:35:48.5 |
HIP 64907 |
29.23 |
| 2026-02-05 00:00 |
13:16:29.92 |
+26:36:44.8 |
HIP 64907 |
30.29 |
| 2026-02-05 12:00 |
13:16:27.16 |
+26:37:41.0 |
HIP 64907 |
31.36 |
| 2026-02-06 00:00 |
13:16:24.36 |
+26:38:37.3 |
HIP 64907 |
32.44 |
| 2026-02-06 12:00 |
13:16:21.51 |
+26:39:33.7 |
HIP 64907 |
33.54 |
| 2026-02-07 00:00 |
13:16:18.62 |
+26:40:30.0 |
HIP 64907 |
34.64 |
| 2026-02-07 12:00 |
13:16:15.69 |
+26:41:26.4 |
HIP 64907 |
35.76 |
| 2026-02-08 00:00 |
13:16:12.71 |
+26:42:22.8 |
HIP 64907 |
36.88 |
| 2026-02-08 12:00 |
13:16:09.69 |
+26:43:19.2 |
HIP 64907 |
38.01 |
| 2026-02-09 00:00 |
13:16:06.62 |
+26:44:15.7 |
HIP 64907 |
39.15 |
| 2026-02-09 12:00 |
13:16:03.51 |
+26:45:12.1 |
HIP 64907 |
40.30 |
| 2026-02-10 00:00 |
13:16:00.36 |
+26:46:08.6 |
HIP 64907 |
41.46 |
| 2026-02-10 12:00 |
13:15:57.17 |
+26:47:05.0 |
HIP 64907 |
42.63 |
| 2026-02-11 00:00 |
13:15:53.93 |
+26:48:01.4 |
HIP 64463 |
41.88 |
| 2026-02-11 12:00 |
13:15:50.65 |
+26:48:57.9 |
HIP 64463 |
41.05 |
| 2026-02-12 00:00 |
13:15:47.32 |
+26:49:54.3 |
HIP 64463 |
40.22 |
| 2026-02-12 12:00 |
13:15:43.95 |
+26:50:50.7 |
HIP 64463 |
39.41 |
| 2026-02-13 00:00 |
13:15:40.55 |
+26:51:47.0 |
HIP 64463 |
38.61 |
| 2026-02-13 12:00 |
13:15:37.10 |
+26:52:43.4 |
HIP 64463 |
37.83 |
| 2026-02-14 00:00 |
13:15:33.60 |
+26:53:39.7 |
HIP 64463 |
37.05 |
| 2026-02-14 12:00 |
13:15:30.07 |
+26:54:35.9 |
HIP 64463 |
36.30 |
| 2026-02-15 00:00 |
13:15:26.49 |
+26:55:32.2 |
HIP 64463 |
35.55 |
| 2026-02-15 12:00 |
13:15:22.88 |
+26:56:28.3 |
HIP 64463 |
34.83 |
| 2026-02-16 00:00 |
13:15:19.22 |
+26:57:24.5 |
HIP 64463 |
34.13 |
| 2026-02-16 12:00 |
13:15:15.52 |
+26:58:20.5 |
HIP 64463 |
33.45 |
| 2026-02-17 00:00 |
13:15:11.78 |
+26:59:16.5 |
HIP 64463 |
32.80 |
| 2026-02-17 12:00 |
13:15:08.01 |
+27:00:12.5 |
HIP 64463 |
32.17 |
| 2026-02-18 00:00 |
13:15:04.19 |
+27:01:08.3 |
HIP 64463 |
31.57 |
| 2026-02-18 12:00 |
13:15:00.33 |
+27:02:04.1 |
HIP 64463 |
31.00 |
| 2026-02-19 00:00 |
13:14:56.44 |
+27:02:59.8 |
HIP 64463 |
30.47 |
| 2026-02-19 12:00 |
13:14:52.50 |
+27:03:55.4 |
HIP 64463 |
29.97 |
| 2026-02-20 00:00 |
13:14:48.53 |
+27:04:51.0 |
HIP 64463 |
29.51 |
| 2026-02-20 12:00 |
13:14:44.52 |
+27:05:46.4 |
HIP 64463 |
29.09 |
| 2026-02-21 00:00 |
13:14:40.47 |
+27:06:41.7 |
HIP 64516 |
28.46 |
| 2026-02-21 12:00 |
13:14:36.38 |
+27:07:36.9 |
HIP 64516 |
27.18 |
| 2026-02-22 00:00 |
13:14:32.26 |
+27:08:32.1 |
HIP 64516 |
25.90 |
| 2026-02-22 12:00 |
13:14:28.09 |
+27:09:27.1 |
HIP 64516 |
24.62 |
| 2026-02-23 00:00 |
13:14:23.90 |
+27:10:21.9 |
HIP 64516 |
23.33 |
| 2026-02-23 12:00 |
13:14:19.66 |
+27:11:16.7 |
HIP 64516 |
22.05 |
| 2026-02-24 00:00 |
13:14:15.39 |
+27:12:11.3 |
HIP 64516 |
20.76 |