449P/Leonard
| 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) |
| 2026-02-03 00:00 |
19:12:48.19 |
-14:02:22.1 |
HIP 94500 |
17.43 |
| 2026-02-03 12:00 |
19:13:19.07 |
-14:00:38.6 |
HIP 94500 |
10.08 |
| 2026-02-04 00:00 |
19:13:49.91 |
-13:58:54.4 |
HIP 94500 |
4.23 |
| 2026-02-04 12:00 |
19:14:20.71 |
-13:57:09.5 |
HIP 94500 |
7.21 |
| 2026-02-05 00:00 |
19:14:51.47 |
-13:55:24.0 |
HIP 94500 |
14.28 |
| 2026-02-05 12:00 |
19:15:22.19 |
-13:53:37.8 |
HIP 94500 |
21.75 |
| 2026-02-06 00:00 |
19:15:52.86 |
-13:51:51.0 |
HIP 94500 |
29.32 |
| 2026-02-06 12:00 |
19:16:23.49 |
-13:50:03.5 |
HIP 94500 |
36.91 |
| 2026-02-07 00:00 |
19:16:54.07 |
-13:48:15.3 |
HIP 94807 |
42.63 |
| 2026-02-07 12:00 |
19:17:24.61 |
-13:46:26.4 |
HIP 94970 |
38.55 |
| 2026-02-08 00:00 |
19:17:55.11 |
-13:44:36.9 |
HIP 94970 |
34.16 |
| 2026-02-08 12:00 |
19:18:25.55 |
-13:42:46.7 |
HIP 94970 |
31.06 |
| 2026-02-09 00:00 |
19:18:55.95 |
-13:40:55.9 |
HIP 94970 |
29.66 |
| 2026-02-09 12:00 |
19:19:26.30 |
-13:39:04.4 |
HIP 95061 |
28.57 |
| 2026-02-10 00:00 |
19:19:56.60 |
-13:37:12.3 |
HIP 95061 |
23.57 |
| 2026-02-10 12:00 |
19:20:26.85 |
-13:35:19.5 |
HIP 95061 |
20.25 |
| 2026-02-11 00:00 |
19:20:57.05 |
-13:33:26.0 |
HIP 95061 |
19.47 |
| 2026-02-11 12:00 |
19:21:27.19 |
-13:31:31.9 |
HIP 95061 |
21.51 |
| 2026-02-12 00:00 |
19:21:57.28 |
-13:29:37.1 |
HIP 95136 |
23.35 |
| 2026-02-12 12:00 |
19:22:27.32 |
-13:27:41.7 |
HIP 95317 |
19.89 |
| 2026-02-13 00:00 |
19:22:57.31 |
-13:25:45.7 |
HIP 95317 |
13.22 |
| 2026-02-13 12:00 |
19:23:27.24 |
-13:23:49.0 |
HIP 95317 |
8.23 |
| 2026-02-14 00:00 |
19:23:57.11 |
-13:21:51.7 |
HIP 95317 |
8.61 |
| 2026-02-14 12:00 |
19:24:26.92 |
-13:19:53.7 |
HIP 95317 |
13.90 |
| 2026-02-15 00:00 |
19:24:56.68 |
-13:17:55.1 |
HIP 95317 |
20.61 |
| 2026-02-15 12:00 |
19:25:26.37 |
-13:15:55.9 |
HIP 95579 |
16.86 |
| 2026-02-16 00:00 |
19:25:56.01 |
-13:13:56.1 |
HIP 95579 |
9.71 |
| 2026-02-16 12:00 |
19:26:25.59 |
-13:11:55.6 |
HIP 95579 |
4.03 |
| 2026-02-17 00:00 |
19:26:55.10 |
-13:09:54.5 |
HIP 95579 |
7.05 |
| 2026-02-17 12:00 |
19:27:24.55 |
-13:07:52.8 |
HIP 95579 |
13.94 |
| 2026-02-18 00:00 |
19:27:53.93 |
-13:05:50.4 |
HIP 95579 |
21.19 |
| 2026-02-18 12:00 |
19:28:23.25 |
-13:03:47.5 |
HIP 95579 |
28.53 |
| 2026-02-19 00:00 |
19:28:52.51 |
-13:01:43.9 |
HIP 95847 |
25.45 |
| 2026-02-19 12:00 |
19:29:21.70 |
-12:59:39.8 |
HIP 95847 |
21.23 |
| 2026-02-20 00:00 |
19:29:50.82 |
-12:57:35.0 |
HIP 95847 |
19.05 |
| 2026-02-20 12:00 |
19:30:19.87 |
-12:55:29.6 |
HIP 95847 |
19.59 |
| 2026-02-21 00:00 |
19:30:48.85 |
-12:53:23.6 |
HIP 95883 |
21.80 |
| 2026-02-21 12:00 |
19:31:17.77 |
-12:51:17.1 |
HIP 95883 |
24.74 |
| 2026-02-22 00:00 |
19:31:46.61 |
-12:49:09.9 |
HIP 95883 |
29.26 |
| 2026-02-22 12:00 |
19:32:15.38 |
-12:47:02.2 |
HIP 96265 |
33.00 |
| 2026-02-23 00:00 |
19:32:44.07 |
-12:44:53.9 |
HIP 96265 |
27.07 |
| 2026-02-23 12:00 |
19:33:12.70 |
-12:42:45.0 |
HIP 96265 |
22.03 |
| 2026-02-24 00:00 |
19:33:41.25 |
-12:40:35.5 |
HIP 96265 |
18.56 |