| Parameter |
Value |
| Designation |
457P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-05-04T06:45:39.692160Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:13:03Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
36.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2016-07-03T13:38:06.950400Z |
| Discovery magnitude (MPC) |
23.20 T |
| Discovery observatory (MPC) |
T09 · Subaru Telescope, Maunakea |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-13.0000000 |
| e |
0.11977371 |
| q (au) |
2.329381 |
| a (au) |
2.646344 |
| i (deg) |
5.222268 |
| Ω (om, deg) |
176.012536 |
| ω (w, deg) |
104.953942 |
| M (ma, deg) |
355.127619 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.721 |
| k |
0.978 |
| 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) |
| 2026-09-20 00:00 |
07:38:18.76 |
+16:47:53.4 |
HIP 37151 |
16.94 |
| 2026-09-20 12:00 |
07:38:53.89 |
+16:46:00.3 |
HIP 37151 |
21.83 |
| 2026-09-21 00:00 |
07:39:28.87 |
+16:44:06.9 |
HIP 37436 |
24.64 |
| 2026-09-21 12:00 |
07:40:03.70 |
+16:42:13.2 |
HIP 37436 |
18.02 |
| 2026-09-22 00:00 |
07:40:38.37 |
+16:40:19.2 |
HIP 37436 |
13.75 |
| 2026-09-22 12:00 |
07:41:12.89 |
+16:38:25.0 |
HIP 37436 |
14.08 |
| 2026-09-23 00:00 |
07:41:47.24 |
+16:36:30.5 |
HIP 37436 |
18.73 |
| 2026-09-23 12:00 |
07:42:21.44 |
+16:34:35.7 |
HIP 37436 |
25.39 |
| 2026-09-24 00:00 |
07:42:55.48 |
+16:32:40.8 |
HIP 37662 |
19.17 |
| 2026-09-24 12:00 |
07:43:29.36 |
+16:30:45.6 |
HIP 37662 |
14.29 |
| 2026-09-25 00:00 |
07:44:03.07 |
+16:28:50.1 |
HIP 37662 |
13.41 |
| 2026-09-25 12:00 |
07:44:36.62 |
+16:26:54.5 |
HIP 37662 |
17.11 |
| 2026-09-26 00:00 |
07:45:10.01 |
+16:24:58.6 |
HIP 37911 |
14.27 |
| 2026-09-26 12:00 |
07:45:43.23 |
+16:23:02.6 |
HIP 37911 |
7.05 |
| 2026-09-27 00:00 |
07:46:16.29 |
+16:21:06.3 |
HIP 37911 |
5.47 |
| 2026-09-27 12:00 |
07:46:49.18 |
+16:19:09.9 |
HIP 37911 |
11.94 |
| 2026-09-28 00:00 |
07:47:21.89 |
+16:17:13.3 |
HIP 37911 |
19.65 |
| 2026-09-28 12:00 |
07:47:54.44 |
+16:15:16.5 |
HIP 37911 |
27.54 |
| 2026-09-29 00:00 |
07:48:26.82 |
+16:13:19.6 |
HIP 38026 |
33.45 |
| 2026-09-29 12:00 |
07:48:59.03 |
+16:11:22.6 |
HIP 38284 |
27.31 |
| 2026-09-30 00:00 |
07:49:31.06 |
+16:09:25.4 |
HIP 38284 |
19.74 |
| 2026-09-30 12:00 |
07:50:02.91 |
+16:07:28.1 |
HIP 38284 |
12.66 |
| 2026-10-01 00:00 |
07:50:34.59 |
+16:05:30.7 |
HIP 38284 |
7.47 |
| 2026-10-01 12:00 |
07:51:06.09 |
+16:03:33.2 |
HIP 38284 |
8.61 |
| 2026-10-02 00:00 |
07:51:37.41 |
+16:01:35.6 |
HIP 38288 |
14.44 |
| 2026-10-02 12:00 |
07:52:08.55 |
+15:59:37.9 |
HIP 38288 |
21.39 |
| 2026-10-03 00:00 |
07:52:39.50 |
+15:57:40.1 |
HIP 38519 |
17.27 |
| 2026-10-03 12:00 |
07:53:10.27 |
+15:55:42.3 |
HIP 38519 |
12.71 |
| 2026-10-04 00:00 |
07:53:40.86 |
+15:53:44.4 |
HIP 38578 |
9.35 |
| 2026-10-04 12:00 |
07:54:11.25 |
+15:51:46.5 |
HIP 38578 |
10.90 |
| 2026-10-05 00:00 |
07:54:41.46 |
+15:49:48.6 |
HIP 38578 |
16.25 |
| 2026-10-05 12:00 |
07:55:11.48 |
+15:47:50.6 |
HIP 38578 |
22.82 |
| 2026-10-06 00:00 |
07:55:41.30 |
+15:45:52.7 |
HIP 38848 |
18.87 |
| 2026-10-06 12:00 |
07:56:10.93 |
+15:43:54.7 |
HIP 38848 |
12.20 |
| 2026-10-07 00:00 |
07:56:40.36 |
+15:41:56.8 |
HIP 38848 |
7.15 |
| 2026-10-07 12:00 |
07:57:09.59 |
+15:39:59.0 |
HIP 38848 |
7.83 |
| 2026-10-08 00:00 |
07:57:38.63 |
+15:38:01.1 |
HIP 38848 |
13.31 |
| 2026-10-08 12:00 |
07:58:07.46 |
+15:36:03.4 |
HIP 38848 |
19.93 |
| 2026-10-09 00:00 |
07:58:36.10 |
+15:34:05.7 |
HIP 39052 |
16.56 |
| 2026-10-09 12:00 |
07:59:04.52 |
+15:32:08.0 |
HIP 39052 |
11.11 |
| 2026-10-10 00:00 |
07:59:32.74 |
+15:30:10.5 |
HIP 39052 |
8.59 |
| 2026-10-10 12:00 |
08:00:00.76 |
+15:28:13.1 |
HIP 39052 |
11.11 |
| 2026-10-11 00:00 |
08:00:28.56 |
+15:26:15.8 |
HIP 39125 |
15.12 |