396P/Leonard
| Parameter |
Value |
| Designation |
396P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-08-29T03:15:14.060160Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T23:29:36Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-05-09.0000000 |
| e |
0.41780395 |
| q (au) |
3.983116 |
| a (au) |
6.841537 |
| i (deg) |
5.434040 |
| Ω (om, deg) |
136.663398 |
| ω (w, deg) |
8.678978 |
| M (ma, deg) |
333.720604 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.411 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.411 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.855 |
| k |
0.998 |
| 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) |
| 2026-02-03 00:00 |
20:19:43.98 |
-18:16:12.6 |
HIP 100334 |
17.88 |
| 2026-02-03 12:00 |
20:19:59.14 |
-18:15:25.6 |
HIP 100334 |
14.27 |
| 2026-02-04 00:00 |
20:20:14.28 |
-18:14:38.6 |
HIP 100334 |
10.71 |
| 2026-02-04 12:00 |
20:20:29.39 |
-18:13:51.5 |
HIP 100334 |
7.28 |
| 2026-02-05 00:00 |
20:20:44.49 |
-18:13:04.4 |
HIP 100334 |
4.28 |
| 2026-02-05 12:00 |
20:20:59.56 |
-18:12:17.3 |
HIP 100334 |
3.25 |
| 2026-02-06 00:00 |
20:21:14.61 |
-18:11:30.1 |
HIP 100334 |
5.44 |
| 2026-02-06 12:00 |
20:21:29.64 |
-18:10:42.8 |
HIP 100334 |
8.68 |
| 2026-02-07 00:00 |
20:21:44.64 |
-18:09:55.6 |
HIP 100334 |
12.15 |
| 2026-02-07 12:00 |
20:21:59.62 |
-18:09:08.3 |
HIP 100334 |
15.70 |
| 2026-02-08 00:00 |
20:22:14.57 |
-18:08:21.0 |
HIP 100533 |
17.57 |
| 2026-02-08 12:00 |
20:22:29.50 |
-18:07:33.6 |
HIP 100533 |
15.86 |
| 2026-02-09 00:00 |
20:22:44.40 |
-18:06:46.2 |
HIP 100533 |
14.85 |
| 2026-02-09 12:00 |
20:22:59.27 |
-18:05:58.9 |
HIP 100533 |
14.71 |
| 2026-02-10 00:00 |
20:23:14.12 |
-18:05:11.4 |
HIP 100533 |
15.43 |
| 2026-02-10 12:00 |
20:23:28.94 |
-18:04:24.0 |
HIP 100533 |
16.91 |
| 2026-02-11 00:00 |
20:23:43.73 |
-18:03:36.6 |
HIP 100533 |
18.96 |
| 2026-02-11 12:00 |
20:23:58.49 |
-18:02:49.1 |
HIP 100703 |
18.68 |
| 2026-02-12 00:00 |
20:24:13.22 |
-18:02:01.7 |
HIP 100703 |
15.57 |
| 2026-02-12 12:00 |
20:24:27.92 |
-18:01:14.2 |
HIP 100703 |
12.73 |
| 2026-02-13 00:00 |
20:24:42.59 |
-18:00:26.8 |
HIP 100703 |
10.35 |
| 2026-02-13 12:00 |
20:24:57.22 |
-17:59:39.3 |
HIP 100703 |
8.82 |
| 2026-02-14 00:00 |
20:25:11.83 |
-17:58:51.8 |
HIP 100703 |
8.60 |
| 2026-02-14 12:00 |
20:25:26.40 |
-17:58:04.4 |
HIP 100703 |
9.77 |
| 2026-02-15 00:00 |
20:25:40.94 |
-17:57:17.0 |
HIP 100703 |
11.92 |
| 2026-02-15 12:00 |
20:25:55.44 |
-17:56:29.5 |
HIP 100703 |
14.62 |
| 2026-02-16 00:00 |
20:26:09.91 |
-17:55:42.1 |
HIP 100703 |
17.61 |
| 2026-02-16 12:00 |
20:26:24.34 |
-17:54:54.7 |
HIP 100703 |
20.76 |
| 2026-02-17 00:00 |
20:26:38.73 |
-17:54:07.4 |
HIP 100931 |
19.53 |
| 2026-02-17 12:00 |
20:26:53.09 |
-17:53:20.0 |
HIP 100931 |
17.05 |
| 2026-02-18 00:00 |
20:27:07.41 |
-17:52:32.7 |
HIP 100931 |
14.98 |
| 2026-02-18 12:00 |
20:27:21.69 |
-17:51:45.4 |
HIP 100931 |
13.51 |
| 2026-02-19 00:00 |
20:27:35.93 |
-17:50:58.2 |
HIP 100931 |
12.85 |
| 2026-02-19 12:00 |
20:27:50.14 |
-17:50:11.0 |
HIP 100931 |
13.12 |
| 2026-02-20 00:00 |
20:28:04.30 |
-17:49:23.8 |
HIP 101027 |
11.28 |
| 2026-02-20 12:00 |
20:28:18.42 |
-17:48:36.7 |
HIP 101027 |
7.91 |
| 2026-02-21 00:00 |
20:28:32.50 |
-17:47:49.6 |
HIP 101027 |
4.66 |
| 2026-02-21 12:00 |
20:28:46.54 |
-17:47:02.6 |
HIP 101027 |
2.15 |
| 2026-02-22 00:00 |
20:29:00.53 |
-17:46:15.6 |
HIP 101027 |
3.32 |
| 2026-02-22 12:00 |
20:29:14.49 |
-17:45:28.7 |
HIP 101027 |
6.39 |
| 2026-02-23 00:00 |
20:29:28.39 |
-17:44:41.9 |
HIP 101027 |
9.68 |
| 2026-02-23 12:00 |
20:29:42.26 |
-17:43:55.1 |
HIP 101027 |
13.01 |
| 2026-02-24 00:00 |
20:29:56.07 |
-17:43:08.3 |
HIP 101040 |
16.18 |