| Parameter |
Value |
| Designation |
449P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-23T14:34:44.742720Z |
| Orbit solution date (soln_date, UTC) |
2024-02-25T22:13:10Z |
| Obs used |
294 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
37.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
1987-03-23T09:59:28.320000Z |
| Discovery magnitude (MPC) |
17.50 T |
| Discovery observatory (MPC) |
260 · Siding Spring Observatory-DSS |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-10-20.0000000 |
| e |
0.47899106 |
| q (au) |
1.874781 |
| a (au) |
3.598367 |
| i (deg) |
15.459226 |
| Ω (om, deg) |
242.570978 |
| ω (w, deg) |
176.651702 |
| M (ma, deg) |
355.002928 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.886 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.886 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.800 |
| k |
0.993 |
| 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) |
| 2026-03-26 00:00 |
19:59:27.75 |
-10:15:28.9 |
HIP 98344 |
10.25 |
| 2026-03-26 12:00 |
19:59:50.17 |
-10:12:50.6 |
HIP 98416 |
15.42 |
| 2026-03-27 00:00 |
20:00:12.46 |
-10:10:12.0 |
HIP 98416 |
14.17 |
| 2026-03-27 12:00 |
20:00:34.61 |
-10:07:33.1 |
HIP 98416 |
15.39 |
| 2026-03-28 00:00 |
20:00:56.63 |
-10:04:53.9 |
HIP 98569 |
15.86 |
| 2026-03-28 12:00 |
20:01:18.52 |
-10:02:14.3 |
HIP 98569 |
17.59 |
| 2026-03-29 00:00 |
20:01:40.28 |
-09:59:34.4 |
HIP 98569 |
20.95 |
| 2026-03-29 12:00 |
20:02:01.91 |
-09:56:54.2 |
HIP 98569 |
25.30 |
| 2026-03-30 00:00 |
20:02:23.39 |
-09:54:13.8 |
HIP 98573 |
29.00 |
| 2026-03-30 12:00 |
20:02:44.75 |
-09:51:33.0 |
HIP 98573 |
29.96 |
| 2026-03-31 00:00 |
20:03:05.96 |
-09:48:51.9 |
HIP 98857 |
30.10 |
| 2026-03-31 12:00 |
20:03:27.04 |
-09:46:10.5 |
HIP 98857 |
24.72 |
| 2026-04-01 00:00 |
20:03:47.98 |
-09:43:28.8 |
HIP 98857 |
19.61 |
| 2026-04-01 12:00 |
20:04:08.78 |
-09:40:46.9 |
HIP 98857 |
15.03 |
| 2026-04-02 00:00 |
20:04:29.44 |
-09:38:04.6 |
HIP 98857 |
11.59 |
| 2026-04-02 12:00 |
20:04:49.96 |
-09:35:22.1 |
HIP 98857 |
10.44 |
| 2026-04-03 00:00 |
20:05:10.33 |
-09:32:39.4 |
HIP 98857 |
12.19 |
| 2026-04-03 12:00 |
20:05:30.56 |
-09:29:56.3 |
HIP 98857 |
15.89 |
| 2026-04-04 00:00 |
20:05:50.65 |
-09:27:13.0 |
HIP 98857 |
20.47 |
| 2026-04-04 12:00 |
20:06:10.59 |
-09:24:29.5 |
HIP 98857 |
25.46 |
| 2026-04-05 00:00 |
20:06:30.39 |
-09:21:45.7 |
HIP 99085 |
27.63 |
| 2026-04-05 12:00 |
20:06:50.03 |
-09:19:01.7 |
HIP 99085 |
24.21 |
| 2026-04-06 00:00 |
20:07:09.53 |
-09:16:17.4 |
HIP 99085 |
21.70 |
| 2026-04-06 12:00 |
20:07:28.88 |
-09:13:32.9 |
HIP 99085 |
20.39 |
| 2026-04-07 00:00 |
20:07:48.07 |
-09:10:48.1 |
HIP 99085 |
20.51 |
| 2026-04-07 12:00 |
20:08:07.12 |
-09:08:03.2 |
HIP 99085 |
21.99 |
| 2026-04-08 00:00 |
20:08:26.01 |
-09:05:18.0 |
HIP 99085 |
24.59 |
| 2026-04-08 12:00 |
20:08:44.74 |
-09:02:32.7 |
HIP 99085 |
27.97 |
| 2026-04-09 00:00 |
20:09:03.32 |
-08:59:47.1 |
HIP 99085 |
31.86 |
| 2026-04-09 12:00 |
20:09:21.74 |
-08:57:01.3 |
HIP 99457 |
27.53 |
| 2026-04-10 00:00 |
20:09:40.00 |
-08:54:15.4 |
HIP 99457 |
22.56 |
| 2026-04-10 12:00 |
20:09:58.11 |
-08:51:29.3 |
HIP 99457 |
17.80 |
| 2026-04-11 00:00 |
20:10:16.05 |
-08:48:43.0 |
HIP 99457 |
13.47 |
| 2026-04-11 12:00 |
20:10:33.83 |
-08:45:56.5 |
HIP 99457 |
10.07 |
| 2026-04-12 00:00 |
20:10:51.45 |
-08:43:09.8 |
HIP 99457 |
8.69 |
| 2026-04-12 12:00 |
20:11:08.90 |
-08:40:23.1 |
HIP 99457 |
10.16 |
| 2026-04-13 00:00 |
20:11:26.19 |
-08:37:36.1 |
HIP 99457 |
13.54 |
| 2026-04-13 12:00 |
20:11:43.31 |
-08:34:49.1 |
HIP 99457 |
17.74 |
| 2026-04-14 00:00 |
20:12:00.26 |
-08:32:01.9 |
HIP 99457 |
22.28 |
| 2026-04-14 12:00 |
20:12:17.04 |
-08:29:14.5 |
HIP 99558 |
23.71 |
| 2026-04-15 00:00 |
20:12:33.66 |
-08:26:27.1 |
HIP 99558 |
21.40 |
| 2026-04-15 12:00 |
20:12:50.10 |
-08:23:39.5 |
HIP 99558 |
20.06 |
| 2026-04-16 00:00 |
20:13:06.36 |
-08:20:51.9 |
HIP 99558 |
19.86 |