| 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) |
| 2026-06-01 00:00 |
04:52:31.46 |
+18:41:23.7 |
HIP 22654 |
18.52 |
| 2026-06-01 12:00 |
04:53:19.98 |
+18:42:40.9 |
HIP 22654 |
21.73 |
| 2026-06-02 00:00 |
04:54:08.50 |
+18:43:56.9 |
HIP 22745 |
21.87 |
| 2026-06-02 12:00 |
04:54:57.04 |
+18:45:12.0 |
HIP 22745 |
27.19 |
| 2026-06-03 00:00 |
04:55:45.59 |
+18:46:26.0 |
HIP 22745 |
35.61 |
| 2026-06-03 12:00 |
04:56:34.14 |
+18:47:39.1 |
HIP 23109 |
28.06 |
| 2026-06-04 00:00 |
04:57:22.71 |
+18:48:51.1 |
HIP 23109 |
17.57 |
| 2026-06-04 12:00 |
04:58:11.28 |
+18:50:02.0 |
HIP 23109 |
9.87 |
| 2026-06-05 00:00 |
04:58:59.87 |
+18:51:12.0 |
HIP 23109 |
12.37 |
| 2026-06-05 12:00 |
04:59:48.46 |
+18:52:20.9 |
HIP 23134 |
21.07 |
| 2026-06-06 00:00 |
05:00:37.06 |
+18:53:28.7 |
HIP 23401 |
17.72 |
| 2026-06-06 12:00 |
05:01:25.67 |
+18:54:35.6 |
HIP 23401 |
9.31 |
| 2026-06-07 00:00 |
05:02:14.28 |
+18:55:41.4 |
HIP 23401 |
11.23 |
| 2026-06-07 12:00 |
05:03:02.90 |
+18:56:46.1 |
HIP 23579 |
18.11 |
| 2026-06-08 00:00 |
05:03:51.53 |
+18:57:49.8 |
HIP 23579 |
8.94 |
| 2026-06-08 12:00 |
05:04:40.16 |
+18:58:52.5 |
HIP 23579 |
9.92 |
| 2026-06-09 00:00 |
05:05:28.80 |
+18:59:54.2 |
HIP 23579 |
19.59 |
| 2026-06-09 12:00 |
05:06:17.44 |
+19:00:54.8 |
HIP 23835 |
27.60 |
| 2026-06-10 00:00 |
05:07:06.08 |
+19:01:54.3 |
HIP 23835 |
23.71 |
| 2026-06-10 12:00 |
05:07:54.73 |
+19:02:52.8 |
HIP 23976 |
18.99 |
| 2026-06-11 00:00 |
05:08:43.38 |
+19:03:50.3 |
HIP 23976 |
9.22 |
| 2026-06-11 12:00 |
05:09:32.03 |
+19:04:46.7 |
HIP 23976 |
8.69 |
| 2026-06-12 00:00 |
05:10:20.68 |
+19:05:42.0 |
HIP 23976 |
18.22 |
| 2026-06-12 12:00 |
05:11:09.34 |
+19:06:36.3 |
HIP 23976 |
29.23 |
| 2026-06-13 00:00 |
05:11:57.99 |
+19:07:29.6 |
HIP 24284 |
34.04 |
| 2026-06-13 12:00 |
05:12:46.64 |
+19:08:21.7 |
HIP 24284 |
31.56 |
| 2026-06-14 00:00 |
05:13:35.30 |
+19:09:12.9 |
HIP 24284 |
33.16 |
| 2026-06-14 12:00 |
05:14:23.94 |
+19:10:02.9 |
HIP 24574 |
27.89 |
| 2026-06-15 00:00 |
05:15:12.59 |
+19:10:52.0 |
HIP 24574 |
16.79 |
| 2026-06-15 12:00 |
05:16:01.23 |
+19:11:39.9 |
HIP 24574 |
7.17 |
| 2026-06-16 00:00 |
05:16:49.87 |
+19:12:26.8 |
HIP 24615 |
5.72 |
| 2026-06-16 12:00 |
05:17:38.50 |
+19:13:12.6 |
HIP 24615 |
13.01 |
| 2026-06-17 00:00 |
05:18:27.12 |
+19:13:57.4 |
HIP 24615 |
23.89 |
| 2026-06-17 12:00 |
05:19:15.74 |
+19:14:41.1 |
HIP 24906 |
24.86 |
| 2026-06-18 00:00 |
05:20:04.35 |
+19:15:23.8 |
HIP 24906 |
19.58 |
| 2026-06-18 12:00 |
05:20:52.95 |
+19:16:05.3 |
HIP 24906 |
20.32 |
| 2026-06-19 00:00 |
05:21:41.55 |
+19:16:45.9 |
HIP 25134 |
22.05 |
| 2026-06-19 12:00 |
05:22:30.13 |
+19:17:25.3 |
HIP 25134 |
17.11 |
| 2026-06-20 00:00 |
05:23:18.70 |
+19:18:03.7 |
HIP 25134 |
19.06 |
| 2026-06-20 12:00 |
05:24:07.26 |
+19:18:41.1 |
HIP 25134 |
26.40 |
| 2026-06-21 00:00 |
05:24:55.81 |
+19:19:17.3 |
HIP 25134 |
35.96 |
| 2026-06-21 12:00 |
05:25:44.35 |
+19:19:52.6 |
HIP 25534 |
26.62 |
| 2026-06-22 00:00 |
05:26:32.87 |
+19:20:26.7 |
HIP 25534 |
15.29 |