| 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 |
0.998 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
12:57:36.31 |
+28:26:24.1 |
HIP 63252 |
0.77 |
| 2026-06-01 12:00 |
12:57:32.91 |
+28:26:07.6 |
HIP 63252 |
1.30 |
| 2026-06-02 00:00 |
12:57:29.55 |
+28:25:50.7 |
HIP 63252 |
2.01 |
| 2026-06-02 12:00 |
12:57:26.23 |
+28:25:33.4 |
HIP 63252 |
2.75 |
| 2026-06-03 00:00 |
12:57:22.95 |
+28:25:15.8 |
HIP 63252 |
3.51 |
| 2026-06-03 12:00 |
12:57:19.71 |
+28:24:57.8 |
HIP 63252 |
4.26 |
| 2026-06-04 00:00 |
12:57:16.50 |
+28:24:39.5 |
HIP 63252 |
5.02 |
| 2026-06-04 12:00 |
12:57:13.34 |
+28:24:20.9 |
HIP 63252 |
5.77 |
| 2026-06-05 00:00 |
12:57:10.22 |
+28:24:01.8 |
HIP 63252 |
6.52 |
| 2026-06-05 12:00 |
12:57:07.14 |
+28:23:42.5 |
HIP 63252 |
7.26 |
| 2026-06-06 00:00 |
12:57:04.09 |
+28:23:22.8 |
HIP 63252 |
8.00 |
| 2026-06-06 12:00 |
12:57:01.09 |
+28:23:02.7 |
HIP 63252 |
8.73 |
| 2026-06-07 00:00 |
12:56:58.13 |
+28:22:42.3 |
HIP 63252 |
9.45 |
| 2026-06-07 12:00 |
12:56:55.21 |
+28:22:21.6 |
HIP 63252 |
10.18 |
| 2026-06-08 00:00 |
12:56:52.33 |
+28:22:00.5 |
HIP 63252 |
10.89 |
| 2026-06-08 12:00 |
12:56:49.49 |
+28:21:39.1 |
HIP 63252 |
11.60 |
| 2026-06-09 00:00 |
12:56:46.69 |
+28:21:17.4 |
HIP 63252 |
12.31 |
| 2026-06-09 12:00 |
12:56:43.93 |
+28:20:55.3 |
HIP 63252 |
13.01 |
| 2026-06-10 00:00 |
12:56:41.22 |
+28:20:33.0 |
HIP 63252 |
13.70 |
| 2026-06-10 12:00 |
12:56:38.55 |
+28:20:10.2 |
HIP 63252 |
14.39 |
| 2026-06-11 00:00 |
12:56:35.91 |
+28:19:47.2 |
HIP 63252 |
15.08 |
| 2026-06-11 12:00 |
12:56:33.32 |
+28:19:23.9 |
HIP 63252 |
15.76 |
| 2026-06-12 00:00 |
12:56:30.78 |
+28:19:00.2 |
HIP 63252 |
16.43 |
| 2026-06-12 12:00 |
12:56:28.27 |
+28:18:36.2 |
HIP 63252 |
17.10 |
| 2026-06-13 00:00 |
12:56:25.81 |
+28:18:11.9 |
HIP 63252 |
17.76 |
| 2026-06-13 12:00 |
12:56:23.39 |
+28:17:47.3 |
HIP 63039 |
17.94 |
| 2026-06-14 00:00 |
12:56:21.01 |
+28:17:22.4 |
HIP 63039 |
17.34 |
| 2026-06-14 12:00 |
12:56:18.67 |
+28:16:57.1 |
HIP 63039 |
16.76 |
| 2026-06-15 00:00 |
12:56:16.38 |
+28:16:31.6 |
HIP 63039 |
16.19 |
| 2026-06-15 12:00 |
12:56:14.13 |
+28:16:05.8 |
HIP 63039 |
15.64 |
| 2026-06-16 00:00 |
12:56:11.92 |
+28:15:39.7 |
HIP 63039 |
15.11 |
| 2026-06-16 12:00 |
12:56:09.76 |
+28:15:13.3 |
HIP 63039 |
14.59 |
| 2026-06-17 00:00 |
12:56:07.64 |
+28:14:46.6 |
HIP 63039 |
14.10 |
| 2026-06-17 12:00 |
12:56:05.56 |
+28:14:19.6 |
HIP 63039 |
13.62 |
| 2026-06-18 00:00 |
12:56:03.53 |
+28:13:52.3 |
HIP 63039 |
13.17 |
| 2026-06-18 12:00 |
12:56:01.53 |
+28:13:24.7 |
HIP 63039 |
12.75 |
| 2026-06-19 00:00 |
12:55:59.59 |
+28:12:56.9 |
HIP 63039 |
12.35 |
| 2026-06-19 12:00 |
12:55:57.68 |
+28:12:28.8 |
HIP 63039 |
11.99 |
| 2026-06-20 00:00 |
12:55:55.82 |
+28:12:00.4 |
HIP 63039 |
11.66 |
| 2026-06-20 12:00 |
12:55:54.00 |
+28:11:31.7 |
HIP 63039 |
11.36 |
| 2026-06-21 00:00 |
12:55:52.23 |
+28:11:02.8 |
HIP 63039 |
11.10 |
| 2026-06-21 12:00 |
12:55:50.50 |
+28:10:33.7 |
HIP 63039 |
10.88 |
| 2026-06-22 00:00 |
12:55:48.81 |
+28:10:04.2 |
HIP 63039 |
10.70 |