| 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) |
| 2026-09-25 00:00 |
17:25:35.56 |
-18:58:12.0 |
HIP 85224 |
12.21 |
| 2026-09-25 12:00 |
17:25:50.60 |
-18:58:57.4 |
HIP 85224 |
15.66 |
| 2026-09-26 00:00 |
17:26:05.80 |
-18:59:42.7 |
HIP 85224 |
19.22 |
| 2026-09-26 12:00 |
17:26:21.17 |
-19:00:27.8 |
HIP 85224 |
22.84 |
| 2026-09-27 00:00 |
17:26:36.70 |
-19:01:12.9 |
HIP 85446 |
19.78 |
| 2026-09-27 12:00 |
17:26:52.39 |
-19:01:57.8 |
HIP 85446 |
16.48 |
| 2026-09-28 00:00 |
17:27:08.24 |
-19:02:42.6 |
HIP 85446 |
13.43 |
| 2026-09-28 12:00 |
17:27:24.24 |
-19:03:27.3 |
HIP 85446 |
10.86 |
| 2026-09-29 00:00 |
17:27:40.41 |
-19:04:11.8 |
HIP 85446 |
9.22 |
| 2026-09-29 12:00 |
17:27:56.73 |
-19:04:56.2 |
HIP 85446 |
9.10 |
| 2026-09-30 00:00 |
17:28:13.20 |
-19:05:40.5 |
HIP 85446 |
10.58 |
| 2026-09-30 12:00 |
17:28:29.83 |
-19:06:24.6 |
HIP 85446 |
13.16 |
| 2026-10-01 00:00 |
17:28:46.62 |
-19:07:08.5 |
HIP 85446 |
16.36 |
| 2026-10-01 12:00 |
17:29:03.56 |
-19:07:52.3 |
HIP 85446 |
19.89 |
| 2026-10-02 00:00 |
17:29:20.65 |
-19:08:36.0 |
HIP 85690 |
19.01 |
| 2026-10-02 12:00 |
17:29:37.89 |
-19:09:19.5 |
HIP 85690 |
15.06 |
| 2026-10-03 00:00 |
17:29:55.28 |
-19:10:02.8 |
HIP 85690 |
11.20 |
| 2026-10-03 12:00 |
17:30:12.82 |
-19:10:46.0 |
HIP 85690 |
7.66 |
| 2026-10-04 00:00 |
17:30:30.50 |
-19:11:28.9 |
HIP 85690 |
5.19 |
| 2026-10-04 12:00 |
17:30:48.34 |
-19:12:11.7 |
HIP 85690 |
5.59 |
| 2026-10-05 00:00 |
17:31:06.32 |
-19:12:54.4 |
HIP 85690 |
8.51 |
| 2026-10-05 12:00 |
17:31:24.45 |
-19:13:36.8 |
HIP 85690 |
12.30 |
| 2026-10-06 00:00 |
17:31:42.72 |
-19:14:19.1 |
HIP 85690 |
16.39 |
| 2026-10-06 12:00 |
17:32:01.13 |
-19:15:01.1 |
HIP 85690 |
20.63 |
| 2026-10-07 00:00 |
17:32:19.69 |
-19:15:43.0 |
HIP 85690 |
24.96 |
| 2026-10-07 12:00 |
17:32:38.39 |
-19:16:24.6 |
HIP 85965 |
22.23 |
| 2026-10-08 00:00 |
17:32:57.22 |
-19:17:06.1 |
HIP 85965 |
18.22 |
| 2026-10-08 12:00 |
17:33:16.20 |
-19:17:47.3 |
HIP 85965 |
14.47 |
| 2026-10-09 00:00 |
17:33:35.32 |
-19:18:28.3 |
HIP 85965 |
11.29 |
| 2026-10-09 12:00 |
17:33:54.57 |
-19:19:09.1 |
HIP 85965 |
9.32 |
| 2026-10-10 00:00 |
17:34:13.96 |
-19:19:49.7 |
HIP 85965 |
9.40 |
| 2026-10-10 12:00 |
17:34:33.49 |
-19:20:30.1 |
HIP 85965 |
11.54 |
| 2026-10-11 00:00 |
17:34:53.15 |
-19:21:10.2 |
HIP 85965 |
14.89 |
| 2026-10-11 12:00 |
17:35:12.94 |
-19:21:50.1 |
HIP 85965 |
18.85 |
| 2026-10-12 00:00 |
17:35:32.87 |
-19:22:29.8 |
HIP 85965 |
23.11 |
| 2026-10-12 12:00 |
17:35:52.92 |
-19:23:09.2 |
HIP 85965 |
27.56 |
| 2026-10-13 00:00 |
17:36:13.11 |
-19:23:48.3 |
HIP 86208 |
26.86 |
| 2026-10-13 12:00 |
17:36:33.42 |
-19:24:27.2 |
HIP 86208 |
25.82 |
| 2026-10-14 00:00 |
17:36:53.86 |
-19:25:05.9 |
HIP 86208 |
25.65 |
| 2026-10-14 12:00 |
17:37:14.43 |
-19:25:44.3 |
HIP 86365 |
23.86 |
| 2026-10-15 00:00 |
17:37:35.12 |
-19:26:22.4 |
HIP 86365 |
19.01 |
| 2026-10-15 12:00 |
17:37:55.93 |
-19:27:00.3 |
HIP 86365 |
14.19 |
| 2026-10-16 00:00 |
17:38:16.87 |
-19:27:37.9 |
HIP 86365 |
9.46 |