| Parameter |
Value |
| Designation |
486P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-04-03T20:04:11.291520Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:43:23Z |
| Obs used |
737 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
6.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-06-14T10:08:30.048000Z |
| Discovery magnitude (MPC) |
18.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-10-21.0000000 |
| e |
0.36396355 |
| q (au) |
2.308216 |
| a (au) |
3.629062 |
| i (deg) |
2.209421 |
| Ω (om, deg) |
219.032259 |
| ω (w, deg) |
93.965161 |
| M (ma, deg) |
284.321405 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.515 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.515 |
| n |
6.000 |
| gf |
0.861 |
| gb |
-0.802 |
| k |
0.974 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:59:56.39 |
+21:55:07.3 |
HIP 23167 |
16.57 |
| 2026-07-29 12:00 |
05:00:28.88 |
+21:55:42.6 |
HIP 23167 |
23.08 |
| 2026-07-30 00:00 |
05:01:01.26 |
+21:56:17.3 |
HIP 23167 |
30.06 |
| 2026-07-30 12:00 |
05:01:33.52 |
+21:56:51.3 |
HIP 23497 |
30.30 |
| 2026-07-31 00:00 |
05:02:05.65 |
+21:57:24.7 |
HIP 23497 |
26.05 |
| 2026-07-31 12:00 |
05:02:37.66 |
+21:57:57.5 |
HIP 23497 |
23.48 |
| 2026-08-01 00:00 |
05:03:09.54 |
+21:58:29.7 |
HIP 23497 |
23.11 |
| 2026-08-01 12:00 |
05:03:41.30 |
+21:59:01.3 |
HIP 23592 |
22.49 |
| 2026-08-02 00:00 |
05:04:12.93 |
+21:59:32.2 |
HIP 23656 |
20.57 |
| 2026-08-02 12:00 |
05:04:44.43 |
+22:00:02.6 |
HIP 23656 |
17.06 |
| 2026-08-03 00:00 |
05:05:15.80 |
+22:00:32.3 |
HIP 23656 |
16.30 |
| 2026-08-03 12:00 |
05:05:47.05 |
+22:01:01.5 |
HIP 23656 |
18.61 |
| 2026-08-04 00:00 |
05:06:18.16 |
+22:01:30.0 |
HIP 23656 |
23.05 |
| 2026-08-04 12:00 |
05:06:49.14 |
+22:01:57.9 |
HIP 23909 |
23.67 |
| 2026-08-05 00:00 |
05:07:19.99 |
+22:02:25.3 |
HIP 23909 |
18.50 |
| 2026-08-05 12:00 |
05:07:50.70 |
+22:02:52.1 |
HIP 23909 |
15.06 |
| 2026-08-06 00:00 |
05:08:21.28 |
+22:03:18.2 |
HIP 23909 |
14.60 |
| 2026-08-06 12:00 |
05:08:51.72 |
+22:03:43.8 |
HIP 23909 |
17.31 |
| 2026-08-07 00:00 |
05:09:22.02 |
+22:04:08.8 |
HIP 24063 |
12.47 |
| 2026-08-07 12:00 |
05:09:52.18 |
+22:04:33.2 |
HIP 24063 |
6.03 |
| 2026-08-08 00:00 |
05:10:22.20 |
+22:04:57.1 |
HIP 24063 |
3.89 |
| 2026-08-08 12:00 |
05:10:52.08 |
+22:05:20.4 |
HIP 24158 |
6.20 |
| 2026-08-09 00:00 |
05:11:21.82 |
+22:05:43.1 |
HIP 24158 |
1.59 |
| 2026-08-09 12:00 |
05:11:51.41 |
+22:06:05.2 |
HIP 24158 |
7.82 |
| 2026-08-10 00:00 |
05:12:20.86 |
+22:06:26.8 |
HIP 24158 |
14.60 |
| 2026-08-10 12:00 |
05:12:50.16 |
+22:06:47.8 |
HIP 24285 |
17.07 |
| 2026-08-11 00:00 |
05:13:19.31 |
+22:07:08.3 |
HIP 24285 |
19.26 |
| 2026-08-11 12:00 |
05:13:48.31 |
+22:07:28.2 |
HIP 24285 |
23.25 |
| 2026-08-12 00:00 |
05:14:17.16 |
+22:07:47.6 |
HIP 24512 |
18.78 |
| 2026-08-12 12:00 |
05:14:45.86 |
+22:08:06.4 |
HIP 24512 |
13.20 |
| 2026-08-13 00:00 |
05:15:14.41 |
+22:08:24.7 |
HIP 24512 |
9.21 |
| 2026-08-13 12:00 |
05:15:42.80 |
+22:08:42.4 |
HIP 24512 |
9.09 |
| 2026-08-14 00:00 |
05:16:11.03 |
+22:08:59.7 |
HIP 24512 |
12.90 |
| 2026-08-14 12:00 |
05:16:39.11 |
+22:09:16.3 |
HIP 24512 |
18.29 |
| 2026-08-15 00:00 |
05:17:07.03 |
+22:09:32.5 |
HIP 24512 |
24.20 |
| 2026-08-15 12:00 |
05:17:34.78 |
+22:09:48.2 |
HIP 24822 |
23.91 |
| 2026-08-16 00:00 |
05:18:02.38 |
+22:10:03.3 |
HIP 24822 |
17.70 |
| 2026-08-16 12:00 |
05:18:29.82 |
+22:10:17.9 |
HIP 24822 |
11.73 |
| 2026-08-17 00:00 |
05:18:57.09 |
+22:10:32.0 |
HIP 24822 |
6.54 |
| 2026-08-17 12:00 |
05:19:24.20 |
+22:10:45.7 |
HIP 24822 |
5.26 |
| 2026-08-18 00:00 |
05:19:51.15 |
+22:10:58.8 |
HIP 24822 |
9.53 |
| 2026-08-18 12:00 |
05:20:17.93 |
+22:11:11.4 |
HIP 24822 |
15.19 |
| 2026-08-19 00:00 |
05:20:44.54 |
+22:11:23.5 |
HIP 25070 |
17.78 |