| Parameter |
Value |
| Designation |
363P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-03-22T13:30:17.461440Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:16Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-25.0000000 |
| e |
0.55752671 |
| q (au) |
1.506711 |
| a (au) |
3.405202 |
| i (deg) |
3.974829 |
| Ω (om, deg) |
169.924921 |
| ω (w, deg) |
315.265579 |
| M (ma, deg) |
217.333360 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.388 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.388 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
18:09:19.34 |
-17:23:53.1 |
HIP 89025 |
23.38 |
| 2026-05-12 12:00 |
18:09:04.82 |
-17:23:34.0 |
HIP 88816 |
23.18 |
| 2026-05-13 00:00 |
18:08:50.07 |
-17:23:15.2 |
HIP 88816 |
20.31 |
| 2026-05-13 12:00 |
18:08:35.10 |
-17:22:56.6 |
HIP 88816 |
17.65 |
| 2026-05-14 00:00 |
18:08:19.89 |
-17:22:38.4 |
HIP 88816 |
15.35 |
| 2026-05-14 12:00 |
18:08:04.47 |
-17:22:20.4 |
HIP 88816 |
13.63 |
| 2026-05-15 00:00 |
18:07:48.82 |
-17:22:02.8 |
HIP 88816 |
12.79 |
| 2026-05-15 12:00 |
18:07:32.95 |
-17:21:45.5 |
HIP 88816 |
13.03 |
| 2026-05-16 00:00 |
18:07:16.87 |
-17:21:28.4 |
HIP 88816 |
14.35 |
| 2026-05-16 12:00 |
18:07:00.57 |
-17:21:11.7 |
HIP 88816 |
16.52 |
| 2026-05-17 00:00 |
18:06:44.06 |
-17:20:55.3 |
HIP 88816 |
19.29 |
| 2026-05-17 12:00 |
18:06:27.34 |
-17:20:39.2 |
HIP 88816 |
22.46 |
| 2026-05-18 00:00 |
18:06:10.41 |
-17:20:23.4 |
HIP 88816 |
25.91 |
| 2026-05-18 12:00 |
18:05:53.28 |
-17:20:07.9 |
HIP 88504 |
21.95 |
| 2026-05-19 00:00 |
18:05:35.95 |
-17:19:52.7 |
HIP 88504 |
17.84 |
| 2026-05-19 12:00 |
18:05:18.42 |
-17:19:37.8 |
HIP 88504 |
13.70 |
| 2026-05-20 00:00 |
18:05:00.70 |
-17:19:23.2 |
HIP 88504 |
9.56 |
| 2026-05-20 12:00 |
18:04:42.79 |
-17:19:08.9 |
HIP 88504 |
5.51 |
| 2026-05-21 00:00 |
18:04:24.68 |
-17:18:55.0 |
HIP 88504 |
2.42 |
| 2026-05-21 12:00 |
18:04:06.39 |
-17:18:41.3 |
HIP 88504 |
4.38 |
| 2026-05-22 00:00 |
18:03:47.92 |
-17:18:28.0 |
HIP 88504 |
8.44 |
| 2026-05-22 12:00 |
18:03:29.28 |
-17:18:14.9 |
HIP 88409 |
8.60 |
| 2026-05-23 00:00 |
18:03:10.45 |
-17:18:02.2 |
HIP 88409 |
6.87 |
| 2026-05-23 12:00 |
18:02:51.45 |
-17:17:49.8 |
HIP 88409 |
7.82 |
| 2026-05-24 00:00 |
18:02:32.29 |
-17:17:37.6 |
HIP 88409 |
10.81 |
| 2026-05-24 12:00 |
18:02:12.95 |
-17:17:25.8 |
HIP 88258 |
14.35 |
| 2026-05-25 00:00 |
18:01:53.46 |
-17:17:14.3 |
HIP 88258 |
10.66 |
| 2026-05-25 12:00 |
18:01:33.80 |
-17:17:03.1 |
HIP 88258 |
8.06 |
| 2026-05-26 00:00 |
18:01:13.99 |
-17:16:52.2 |
HIP 88258 |
7.77 |
| 2026-05-26 12:00 |
18:00:54.02 |
-17:16:41.6 |
HIP 88258 |
10.07 |
| 2026-05-27 00:00 |
18:00:33.91 |
-17:16:31.3 |
HIP 88258 |
13.74 |
| 2026-05-27 12:00 |
18:00:13.64 |
-17:16:21.3 |
HIP 88258 |
17.99 |
| 2026-05-28 00:00 |
17:59:53.24 |
-17:16:11.7 |
HIP 88258 |
22.51 |
| 2026-05-28 12:00 |
17:59:32.69 |
-17:16:02.3 |
HIP 88258 |
27.19 |
| 2026-05-29 00:00 |
17:59:12.01 |
-17:15:53.2 |
HIP 88019 |
25.46 |
| 2026-05-29 12:00 |
17:58:51.20 |
-17:15:44.4 |
HIP 88019 |
24.39 |
| 2026-05-30 00:00 |
17:58:30.25 |
-17:15:35.9 |
HIP 88019 |
24.32 |
| 2026-05-30 12:00 |
17:58:09.19 |
-17:15:27.8 |
HIP 88019 |
25.27 |
| 2026-05-31 00:00 |
17:57:47.99 |
-17:15:19.9 |
HIP 88019 |
27.17 |
| 2026-05-31 12:00 |
17:57:26.68 |
-17:15:12.3 |
HIP 88019 |
29.83 |
| 2026-06-01 00:00 |
17:57:05.26 |
-17:15:05.0 |
HIP 88019 |
33.09 |
| 2026-06-01 12:00 |
17:56:43.72 |
-17:14:58.0 |
HIP 87894 |
36.18 |
| 2026-06-02 00:00 |
17:56:22.07 |
-17:14:51.4 |
HIP 87625 |
35.57 |