| Parameter |
Value |
| Designation |
445P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-19T02:37:51.418560Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:58Z |
| Obs used |
308 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
6.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
1998-11-22T06:48:55.008000Z |
| Discovery magnitude (MPC) |
21.10 V |
| Discovery observatory (MPC) |
691 · Steward Observatory, Kitt Peak-Spacewatch |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-12-24.0000000 |
| e |
0.41248906 |
| q (au) |
2.383958 |
| a (au) |
4.057726 |
| i (deg) |
1.088174 |
| Ω (om, deg) |
126.549865 |
| ω (w, deg) |
213.725650 |
| M (ma, deg) |
199.131293 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.751 + 2.907\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.751 |
| n |
2.907 |
| gf |
1.000 |
| gb |
-0.864 |
| k |
0.999 |
| 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) |
| 2026-05-12 00:00 |
09:41:21.66 |
+14:22:29.9 |
HIP 47503 |
15.44 |
| 2026-05-12 12:00 |
09:41:27.41 |
+14:22:00.1 |
HIP 47503 |
15.38 |
| 2026-05-13 00:00 |
09:41:33.31 |
+14:21:29.5 |
HIP 47503 |
15.47 |
| 2026-05-13 12:00 |
09:41:39.37 |
+14:20:58.2 |
HIP 47503 |
15.72 |
| 2026-05-14 00:00 |
09:41:45.58 |
+14:20:26.0 |
HIP 47503 |
16.12 |
| 2026-05-14 12:00 |
09:41:51.95 |
+14:19:53.0 |
HIP 47503 |
16.68 |
| 2026-05-15 00:00 |
09:41:58.47 |
+14:19:19.3 |
HIP 47503 |
17.40 |
| 2026-05-15 12:00 |
09:42:05.14 |
+14:18:44.8 |
HIP 47503 |
18.27 |
| 2026-05-16 00:00 |
09:42:11.97 |
+14:18:09.5 |
HIP 47503 |
19.27 |
| 2026-05-16 12:00 |
09:42:18.95 |
+14:17:33.4 |
HIP 47503 |
20.40 |
| 2026-05-17 00:00 |
09:42:26.08 |
+14:16:56.5 |
HIP 47503 |
21.65 |
| 2026-05-17 12:00 |
09:42:33.35 |
+14:16:18.9 |
HIP 47723 |
22.76 |
| 2026-05-18 00:00 |
09:42:40.78 |
+14:15:40.5 |
HIP 47723 |
20.99 |
| 2026-05-18 12:00 |
09:42:48.36 |
+14:15:01.3 |
HIP 47723 |
19.22 |
| 2026-05-19 00:00 |
09:42:56.08 |
+14:14:21.4 |
HIP 47723 |
17.46 |
| 2026-05-19 12:00 |
09:43:03.95 |
+14:13:40.7 |
HIP 47723 |
15.72 |
| 2026-05-20 00:00 |
09:43:11.96 |
+14:12:59.3 |
HIP 47723 |
14.02 |
| 2026-05-20 12:00 |
09:43:20.12 |
+14:12:17.1 |
HIP 47723 |
12.40 |
| 2026-05-21 00:00 |
09:43:28.43 |
+14:11:34.1 |
HIP 47723 |
10.93 |
| 2026-05-21 12:00 |
09:43:36.87 |
+14:10:50.4 |
HIP 47723 |
9.69 |
| 2026-05-22 00:00 |
09:43:45.46 |
+14:10:06.0 |
HIP 47723 |
8.81 |
| 2026-05-22 12:00 |
09:43:54.19 |
+14:09:20.9 |
HIP 47723 |
8.42 |
| 2026-05-23 00:00 |
09:44:03.06 |
+14:08:35.0 |
HIP 47723 |
8.64 |
| 2026-05-23 12:00 |
09:44:12.07 |
+14:07:48.4 |
HIP 47723 |
9.43 |
| 2026-05-24 00:00 |
09:44:21.22 |
+14:07:01.0 |
HIP 47723 |
10.70 |
| 2026-05-24 12:00 |
09:44:30.50 |
+14:06:13.0 |
HIP 47723 |
12.32 |
| 2026-05-25 00:00 |
09:44:39.92 |
+14:05:24.2 |
HIP 47723 |
14.19 |
| 2026-05-25 12:00 |
09:44:49.48 |
+14:04:34.7 |
HIP 47723 |
16.24 |
| 2026-05-26 00:00 |
09:44:59.17 |
+14:03:44.5 |
HIP 47723 |
18.42 |
| 2026-05-26 12:00 |
09:45:08.99 |
+14:02:53.6 |
HIP 47723 |
20.70 |
| 2026-05-27 00:00 |
09:45:18.95 |
+14:02:02.0 |
HIP 47723 |
23.06 |
| 2026-05-27 12:00 |
09:45:29.04 |
+14:01:09.7 |
HIP 47994 |
23.14 |
| 2026-05-28 00:00 |
09:45:39.26 |
+14:00:16.7 |
HIP 47994 |
21.09 |
| 2026-05-28 12:00 |
09:45:49.61 |
+13:59:23.0 |
HIP 47994 |
19.15 |
| 2026-05-29 00:00 |
09:46:00.09 |
+13:58:28.7 |
HIP 47994 |
17.39 |
| 2026-05-29 12:00 |
09:46:10.70 |
+13:57:33.6 |
HIP 47994 |
15.88 |
| 2026-05-30 00:00 |
09:46:21.43 |
+13:56:37.9 |
HIP 47994 |
14.71 |
| 2026-05-30 12:00 |
09:46:32.30 |
+13:55:41.4 |
HIP 47994 |
13.99 |
| 2026-05-31 00:00 |
09:46:43.29 |
+13:54:44.3 |
HIP 47994 |
13.81 |
| 2026-05-31 12:00 |
09:46:54.40 |
+13:53:46.6 |
HIP 47994 |
14.21 |
| 2026-06-01 00:00 |
09:47:05.64 |
+13:52:48.1 |
HIP 47994 |
15.17 |
| 2026-06-01 12:00 |
09:47:17.00 |
+13:51:49.0 |
HIP 47994 |
16.60 |
| 2026-06-02 00:00 |
09:47:28.48 |
+13:50:49.3 |
HIP 47994 |
18.41 |