486P/Leonard
Metadata
| Parameter | Value |
|---|---|
| Designation | 486P/Leonard |
| Type | P |
| Perihelion (tp_cal, UTC) | 2025-04-03T20:01:30.216000Z |
| Orbit solution date (soln_date, UTC) | 2025-12-23T12:42:37Z |
| Obs used | 734 |
| NEO | - |
| M1 | 14.500 |
| K1 | 7.000 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2018-06-14T10:08:30.048000Z |
| Discovery magnitude (MPC) | 18.50 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-10-17.0000000 |
| e | 0.36396766 |
| q (au) | 2.308198 |
| a (au) | 3.629058 |
| i (deg) | 2.209416 |
| Ω (om, deg) | 219.032314 |
| ω (w, deg) | 93.965412 |
| M (ma, deg) | 283.751299 |
Magnitude
Scatter + Global Linear
$$ M_a = (12.035 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 12.035 |
| n | 6.000 |
| gf | 0.876 |
| gb | -0.750 |
| k | 0.908 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2025-05-30 | 2025-12-06 | -22.1903 | +8.816 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 01:07:20.54 | +07:17:28.5 | HIP 5382 | 26.56 |
| 2026-02-03 12:00 | 01:07:56.11 | +07:20:52.1 | HIP 5382 | 17.38 |
| 2026-02-04 00:00 | 01:08:31.77 | +07:24:16.2 | HIP 5382 | 8.76 |
| 2026-02-04 12:00 | 01:09:07.53 | +07:27:40.6 | HIP 5382 | 5.58 |
| 2026-02-05 00:00 | 01:09:43.37 | +07:31:05.5 | HIP 5382 | 12.90 |
| 2026-02-05 12:00 | 01:10:19.30 | +07:34:30.7 | HIP 5562 | 21.19 |
| 2026-02-06 00:00 | 01:10:55.32 | +07:37:56.3 | HIP 5562 | 13.12 |
| 2026-02-06 12:00 | 01:11:31.42 | +07:41:22.2 | HIP 5562 | 8.85 |
| 2026-02-07 00:00 | 01:12:07.61 | +07:44:48.4 | HIP 5562 | 12.98 |
| 2026-02-07 12:00 | 01:12:43.89 | +07:48:15.1 | HIP 5737 | 20.21 |
| 2026-02-08 00:00 | 01:13:20.25 | +07:51:42.0 | HIP 5743 | 18.08 |
| 2026-02-08 12:00 | 01:13:56.70 | +07:55:09.3 | HIP 5743 | 20.65 |
| 2026-02-09 00:00 | 01:14:33.23 | +07:58:36.8 | HIP 5743 | 26.71 |
| 2026-02-09 12:00 | 01:15:09.84 | +08:02:04.7 | HIP 5995 | 29.45 |
| 2026-02-10 00:00 | 01:15:46.53 | +08:05:32.9 | HIP 5995 | 22.22 |
| 2026-02-10 12:00 | 01:16:23.31 | +08:09:01.3 | HIP 5995 | 17.57 |
| 2026-02-11 00:00 | 01:17:00.17 | +08:12:30.1 | HIP 5995 | 17.72 |
| 2026-02-11 12:00 | 01:17:37.10 | +08:15:59.1 | HIP 5995 | 22.59 |
| 2026-02-12 00:00 | 01:18:14.12 | +08:19:28.4 | HIP 6195 | 18.85 |
| 2026-02-12 12:00 | 01:18:51.22 | +08:22:57.9 | HIP 6195 | 9.21 |
| 2026-02-13 00:00 | 01:19:28.39 | +08:26:27.7 | HIP 6195 | 2.68 |
| 2026-02-13 12:00 | 01:20:05.64 | +08:29:57.7 | HIP 6195 | 11.11 |
| 2026-02-14 00:00 | 01:20:42.96 | +08:33:27.9 | HIP 6372 | 17.20 |
| 2026-02-14 12:00 | 01:21:20.37 | +08:36:58.4 | HIP 6372 | 8.89 |
| 2026-02-15 00:00 | 01:21:57.84 | +08:40:29.1 | HIP 6372 | 7.61 |
| 2026-02-15 12:00 | 01:22:35.39 | +08:44:00.0 | HIP 6372 | 15.28 |
| 2026-02-16 00:00 | 01:23:13.02 | +08:47:31.0 | HIP 6462 | 23.80 |
| 2026-02-16 12:00 | 01:23:50.71 | +08:51:02.3 | HIP 6462 | 22.95 |
| 2026-02-17 00:00 | 01:24:28.48 | +08:54:33.7 | HIP 6462 | 26.19 |
| 2026-02-17 12:00 | 01:25:06.32 | +08:58:05.3 | HIP 6462 | 32.32 |
| 2026-02-18 00:00 | 01:25:44.23 | +09:01:37.0 | HIP 6738 | 29.45 |
| 2026-02-18 12:00 | 01:26:22.21 | +09:05:08.9 | HIP 6720 | 26.77 |
| 2026-02-19 00:00 | 01:27:00.26 | +09:08:40.9 | HIP 6720 | 24.45 |
| 2026-02-19 12:00 | 01:27:38.38 | +09:12:13.1 | HIP 6720 | 26.09 |
| 2026-02-20 00:00 | 01:28:16.56 | +09:15:45.4 | HIP 6720 | 31.08 |
| 2026-02-20 12:00 | 01:28:54.81 | +09:19:17.8 | HIP 7041 | 37.88 |
| 2026-02-21 00:00 | 01:29:33.13 | +09:22:50.3 | HIP 7041 | 28.86 |
| 2026-02-21 12:00 | 01:30:11.51 | +09:26:22.8 | HIP 7041 | 20.82 |
| 2026-02-22 00:00 | 01:30:49.95 | +09:29:55.5 | HIP 7041 | 15.45 |
| 2026-02-22 12:00 | 01:31:28.46 | +09:33:28.2 | HIP 7041 | 15.77 |
| 2026-02-23 00:00 | 01:32:07.03 | +09:37:01.0 | HIP 7041 | 21.55 |
| 2026-02-23 12:00 | 01:32:45.66 | +09:40:33.9 | HIP 7131 | 22.75 |
| 2026-02-24 00:00 | 01:33:24.35 | +09:44:06.8 | HIP 7131 | 27.09 |