| Parameter |
Value |
| Designation |
C/2014 L5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-11-26T09:05:17.537280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:55Z |
| Obs used |
75 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-09-05.0000000 |
| e |
1.00264316 |
| q (au) |
6.203169 |
| a (au) |
-2346.877572 |
| i (deg) |
122.805134 |
| Ω (om, deg) |
35.683472 |
| ω (w, deg) |
45.611210 |
| M (ma, deg) |
-0.000714 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.237 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.237 |
| n |
6.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:53:38.86 |
-03:53:45.1 |
HIP 72739 |
21.96 |
| 2026-09-20 12:00 |
14:53:41.38 |
-03:54:16.3 |
HIP 72739 |
22.39 |
| 2026-09-21 00:00 |
14:53:43.93 |
-03:54:47.6 |
HIP 72739 |
22.85 |
| 2026-09-21 12:00 |
14:53:46.50 |
-03:55:18.9 |
HIP 72739 |
23.33 |
| 2026-09-22 00:00 |
14:53:49.10 |
-03:55:50.2 |
HIP 72739 |
23.84 |
| 2026-09-22 12:00 |
14:53:51.72 |
-03:56:21.5 |
HIP 72739 |
24.38 |
| 2026-09-23 00:00 |
14:53:54.37 |
-03:56:52.8 |
HIP 72990 |
24.69 |
| 2026-09-23 12:00 |
14:53:57.05 |
-03:57:24.1 |
HIP 72990 |
24.68 |
| 2026-09-24 00:00 |
14:53:59.75 |
-03:57:55.5 |
HIP 72990 |
24.70 |
| 2026-09-24 12:00 |
14:54:02.48 |
-03:58:26.8 |
HIP 72990 |
24.74 |
| 2026-09-25 00:00 |
14:54:05.23 |
-03:58:58.2 |
HIP 72990 |
24.81 |
| 2026-09-25 12:00 |
14:54:08.01 |
-03:59:29.5 |
HIP 72990 |
24.91 |
| 2026-09-26 00:00 |
14:54:10.82 |
-04:00:00.9 |
HIP 72990 |
25.03 |
| 2026-09-26 12:00 |
14:54:13.65 |
-04:00:32.2 |
HIP 72990 |
25.18 |
| 2026-09-27 00:00 |
14:54:16.50 |
-04:01:03.6 |
HIP 72990 |
25.36 |
| 2026-09-27 12:00 |
14:54:19.38 |
-04:01:35.0 |
HIP 73014 |
25.32 |
| 2026-09-28 00:00 |
14:54:22.28 |
-04:02:06.3 |
HIP 73014 |
24.48 |
| 2026-09-28 12:00 |
14:54:25.20 |
-04:02:37.7 |
HIP 73014 |
23.64 |
| 2026-09-29 00:00 |
14:54:28.15 |
-04:03:09.0 |
HIP 73014 |
22.80 |
| 2026-09-29 12:00 |
14:54:31.13 |
-04:03:40.4 |
HIP 73014 |
21.96 |
| 2026-09-30 00:00 |
14:54:34.12 |
-04:04:11.7 |
HIP 73014 |
21.12 |
| 2026-09-30 12:00 |
14:54:37.14 |
-04:04:43.0 |
HIP 73014 |
20.29 |
| 2026-10-01 00:00 |
14:54:40.18 |
-04:05:14.3 |
HIP 73014 |
19.47 |
| 2026-10-01 12:00 |
14:54:43.25 |
-04:05:45.6 |
HIP 73014 |
18.65 |
| 2026-10-02 00:00 |
14:54:46.33 |
-04:06:16.9 |
HIP 73014 |
17.84 |
| 2026-10-02 12:00 |
14:54:49.44 |
-04:06:48.2 |
HIP 73014 |
17.04 |
| 2026-10-03 00:00 |
14:54:52.57 |
-04:07:19.4 |
HIP 73014 |
16.25 |
| 2026-10-03 12:00 |
14:54:55.72 |
-04:07:50.6 |
HIP 73014 |
15.48 |
| 2026-10-04 00:00 |
14:54:58.90 |
-04:08:21.9 |
HIP 73014 |
14.72 |
| 2026-10-04 12:00 |
14:55:02.09 |
-04:08:53.0 |
HIP 73014 |
13.99 |
| 2026-10-05 00:00 |
14:55:05.31 |
-04:09:24.2 |
HIP 73014 |
13.29 |
| 2026-10-05 12:00 |
14:55:08.54 |
-04:09:55.3 |
HIP 73014 |
12.61 |
| 2026-10-06 00:00 |
14:55:11.80 |
-04:10:26.4 |
HIP 73014 |
11.98 |
| 2026-10-06 12:00 |
14:55:15.08 |
-04:10:57.5 |
HIP 73014 |
11.39 |
| 2026-10-07 00:00 |
14:55:18.37 |
-04:11:28.6 |
HIP 73014 |
10.86 |
| 2026-10-07 12:00 |
14:55:21.69 |
-04:11:59.6 |
HIP 73014 |
10.39 |
| 2026-10-08 00:00 |
14:55:25.02 |
-04:12:30.6 |
HIP 73014 |
10.00 |
| 2026-10-08 12:00 |
14:55:28.38 |
-04:13:01.5 |
HIP 73014 |
9.69 |
| 2026-10-09 00:00 |
14:55:31.75 |
-04:13:32.4 |
HIP 73014 |
9.48 |
| 2026-10-09 12:00 |
14:55:35.14 |
-04:14:03.3 |
HIP 73014 |
9.37 |
| 2026-10-10 00:00 |
14:55:38.55 |
-04:14:34.1 |
HIP 73014 |
9.37 |
| 2026-10-10 12:00 |
14:55:41.98 |
-04:15:04.9 |
HIP 73014 |
9.47 |
| 2026-10-11 00:00 |
14:55:45.43 |
-04:15:35.6 |
HIP 73014 |
9.68 |