445P/Lemmon-PANSTARRS
| 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) |
| 2026-02-03 00:00 |
10:10:34.70 |
+11:46:05.9 |
HIP 49925 |
21.88 |
| 2026-02-03 12:00 |
10:10:19.11 |
+11:47:35.5 |
HIP 49925 |
23.68 |
| 2026-02-04 00:00 |
10:10:03.44 |
+11:49:05.5 |
HIP 49925 |
26.02 |
| 2026-02-04 12:00 |
10:09:47.69 |
+11:50:35.8 |
HIP 49669 |
22.14 |
| 2026-02-05 00:00 |
10:09:31.88 |
+11:52:06.4 |
HIP 49669 |
17.98 |
| 2026-02-05 12:00 |
10:09:16.00 |
+11:53:37.2 |
HIP 49669 |
13.82 |
| 2026-02-06 00:00 |
10:09:00.05 |
+11:55:08.4 |
HIP 49669 |
9.64 |
| 2026-02-06 12:00 |
10:08:44.03 |
+11:56:39.8 |
HIP 49669 |
5.45 |
| 2026-02-07 00:00 |
10:08:27.96 |
+11:58:11.4 |
HIP 49669 |
1.35 |
| 2026-02-07 12:00 |
10:08:11.83 |
+11:59:43.2 |
HIP 49669 |
3.10 |
| 2026-02-08 00:00 |
10:07:55.64 |
+12:01:15.3 |
HIP 49669 |
7.31 |
| 2026-02-08 12:00 |
10:07:39.40 |
+12:02:47.5 |
HIP 49669 |
11.55 |
| 2026-02-09 00:00 |
10:07:23.11 |
+12:04:19.9 |
HIP 49669 |
15.82 |
| 2026-02-09 12:00 |
10:07:06.77 |
+12:05:52.5 |
HIP 49669 |
20.10 |
| 2026-02-10 00:00 |
10:06:50.38 |
+12:07:25.2 |
HIP 49669 |
24.39 |
| 2026-02-10 12:00 |
10:06:33.95 |
+12:08:58.1 |
HIP 49433 |
28.27 |
| 2026-02-11 00:00 |
10:06:17.49 |
+12:10:31.0 |
HIP 49433 |
24.85 |
| 2026-02-11 12:00 |
10:06:00.98 |
+12:12:04.1 |
HIP 49433 |
21.75 |
| 2026-02-12 00:00 |
10:05:44.44 |
+12:13:37.3 |
HIP 49433 |
19.12 |
| 2026-02-12 12:00 |
10:05:27.86 |
+12:15:10.5 |
HIP 49433 |
17.19 |
| 2026-02-13 00:00 |
10:05:11.26 |
+12:16:43.8 |
HIP 49433 |
16.21 |
| 2026-02-13 12:00 |
10:04:54.63 |
+12:18:17.1 |
HIP 49433 |
16.38 |
| 2026-02-14 00:00 |
10:04:37.97 |
+12:19:50.4 |
HIP 49433 |
17.65 |
| 2026-02-14 12:00 |
10:04:21.30 |
+12:21:23.8 |
HIP 49300 |
16.43 |
| 2026-02-15 00:00 |
10:04:04.60 |
+12:22:57.1 |
HIP 49300 |
16.23 |
| 2026-02-15 12:00 |
10:03:47.89 |
+12:24:30.4 |
HIP 49300 |
17.18 |
| 2026-02-16 00:00 |
10:03:31.17 |
+12:26:03.7 |
HIP 49300 |
19.11 |
| 2026-02-16 12:00 |
10:03:14.44 |
+12:27:36.9 |
HIP 49300 |
21.75 |
| 2026-02-17 00:00 |
10:02:57.70 |
+12:29:10.0 |
HIP 49158 |
20.87 |
| 2026-02-17 12:00 |
10:02:40.95 |
+12:30:43.1 |
HIP 49158 |
19.39 |
| 2026-02-18 00:00 |
10:02:24.21 |
+12:32:16.0 |
HIP 49158 |
18.83 |
| 2026-02-18 12:00 |
10:02:07.46 |
+12:33:48.8 |
HIP 49158 |
19.27 |
| 2026-02-19 00:00 |
10:01:50.72 |
+12:35:21.5 |
HIP 49158 |
20.65 |
| 2026-02-19 12:00 |
10:01:33.99 |
+12:36:54.1 |
HIP 49158 |
22.79 |
| 2026-02-20 00:00 |
10:01:17.27 |
+12:38:26.4 |
HIP 49158 |
25.50 |
| 2026-02-20 12:00 |
10:01:00.56 |
+12:39:58.6 |
HIP 49158 |
28.62 |
| 2026-02-21 00:00 |
10:00:43.86 |
+12:41:30.6 |
HIP 49158 |
32.02 |
| 2026-02-21 12:00 |
10:00:27.19 |
+12:43:02.3 |
HIP 49158 |
35.63 |
| 2026-02-22 00:00 |
10:00:10.53 |
+12:44:33.8 |
HIP 48883 |
33.71 |
| 2026-02-22 12:00 |
09:59:53.90 |
+12:46:05.1 |
HIP 48883 |
31.27 |
| 2026-02-23 00:00 |
09:59:37.30 |
+12:47:36.1 |
HIP 48883 |
29.26 |
| 2026-02-23 12:00 |
09:59:20.73 |
+12:49:06.9 |
HIP 48883 |
27.80 |
| 2026-02-24 00:00 |
09:59:04.19 |
+12:50:37.3 |
HIP 48883 |
26.95 |