| Parameter |
Value |
| Designation |
302P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-03-08T21:40:03.639360Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:34Z |
| Obs used |
993 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
16.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-08-18.0000000 |
| e |
0.23011984 |
| q (au) |
3.288834 |
| a (au) |
4.271878 |
| i (deg) |
6.033733 |
| Ω (om, deg) |
121.724408 |
| ω (w, deg) |
208.543535 |
| M (ma, deg) |
296.494117 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.397 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.397 |
| n |
6.000 |
| gf |
0.913 |
| gb |
-0.909 |
| k |
1.000 |
| δ90 |
4.998 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-03-27 |
2024-12-03 |
+19.3467 |
-9.989 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
03:14:48.18 |
+13:08:28.0 |
HIP 15113 |
1.72 |
| 2026-06-01 12:00 |
03:15:23.98 |
+13:10:45.3 |
HIP 15113 |
7.34 |
| 2026-06-02 00:00 |
03:15:59.75 |
+13:13:01.8 |
HIP 15113 |
16.33 |
| 2026-06-02 12:00 |
03:16:35.48 |
+13:15:17.7 |
HIP 15113 |
25.32 |
| 2026-06-03 00:00 |
03:17:11.18 |
+13:17:32.7 |
HIP 15375 |
32.14 |
| 2026-06-03 12:00 |
03:17:46.85 |
+13:19:47.1 |
HIP 15508 |
30.58 |
| 2026-06-04 00:00 |
03:18:22.48 |
+13:22:00.7 |
HIP 15508 |
21.78 |
| 2026-06-04 12:00 |
03:18:58.08 |
+13:24:13.6 |
HIP 15508 |
13.21 |
| 2026-06-05 00:00 |
03:19:33.64 |
+13:26:25.7 |
HIP 15508 |
5.87 |
| 2026-06-05 12:00 |
03:20:09.16 |
+13:28:37.1 |
HIP 15508 |
7.30 |
| 2026-06-06 00:00 |
03:20:44.65 |
+13:30:47.7 |
HIP 15662 |
15.08 |
| 2026-06-06 12:00 |
03:21:20.10 |
+13:32:57.6 |
HIP 15662 |
9.02 |
| 2026-06-07 00:00 |
03:21:55.51 |
+13:35:06.8 |
HIP 15662 |
9.65 |
| 2026-06-07 12:00 |
03:22:30.88 |
+13:37:15.2 |
HIP 15662 |
16.18 |
| 2026-06-08 00:00 |
03:23:06.22 |
+13:39:22.9 |
HIP 15822 |
15.58 |
| 2026-06-08 12:00 |
03:23:41.51 |
+13:41:29.8 |
HIP 15822 |
9.12 |
| 2026-06-09 00:00 |
03:24:16.77 |
+13:43:35.9 |
HIP 15822 |
8.92 |
| 2026-06-09 12:00 |
03:24:51.98 |
+13:45:41.4 |
HIP 15975 |
14.75 |
| 2026-06-10 00:00 |
03:25:27.15 |
+13:47:46.0 |
HIP 15975 |
11.08 |
| 2026-06-10 12:00 |
03:26:02.28 |
+13:49:49.9 |
HIP 15975 |
13.50 |
| 2026-06-11 00:00 |
03:26:37.36 |
+13:51:53.0 |
HIP 15975 |
19.87 |
| 2026-06-11 12:00 |
03:27:12.40 |
+13:53:55.4 |
HIP 15975 |
27.58 |
| 2026-06-12 00:00 |
03:27:47.40 |
+13:55:57.0 |
HIP 16007 |
32.13 |
| 2026-06-12 12:00 |
03:28:22.35 |
+13:57:57.9 |
HIP 16304 |
31.58 |
| 2026-06-13 00:00 |
03:28:57.25 |
+13:59:57.9 |
HIP 16304 |
23.57 |
| 2026-06-13 12:00 |
03:29:32.10 |
+14:01:57.2 |
HIP 16304 |
16.31 |
| 2026-06-14 00:00 |
03:30:06.91 |
+14:03:55.8 |
HIP 16304 |
11.29 |
| 2026-06-14 12:00 |
03:30:41.67 |
+14:05:53.6 |
HIP 16304 |
11.80 |
| 2026-06-15 00:00 |
03:31:16.38 |
+14:07:50.5 |
HIP 16359 |
12.44 |
| 2026-06-15 12:00 |
03:31:51.03 |
+14:09:46.8 |
HIP 16445 |
9.66 |
| 2026-06-16 00:00 |
03:32:25.64 |
+14:11:42.2 |
HIP 16445 |
12.09 |
| 2026-06-16 12:00 |
03:33:00.19 |
+14:13:36.9 |
HIP 16445 |
18.62 |
| 2026-06-17 00:00 |
03:33:34.69 |
+14:15:30.8 |
HIP 16671 |
15.07 |
| 2026-06-17 12:00 |
03:34:09.14 |
+14:17:23.9 |
HIP 16671 |
9.03 |
| 2026-06-18 00:00 |
03:34:43.53 |
+14:19:16.2 |
HIP 16671 |
9.06 |
| 2026-06-18 12:00 |
03:35:17.86 |
+14:21:07.7 |
HIP 16748 |
10.91 |
| 2026-06-19 00:00 |
03:35:52.14 |
+14:22:58.5 |
HIP 16748 |
13.76 |
| 2026-06-19 12:00 |
03:36:26.36 |
+14:24:48.5 |
HIP 16748 |
20.09 |
| 2026-06-20 00:00 |
03:37:00.53 |
+14:26:37.7 |
HIP 16748 |
27.59 |
| 2026-06-20 12:00 |
03:37:34.63 |
+14:28:26.1 |
HIP 17068 |
27.85 |
| 2026-06-21 00:00 |
03:38:08.68 |
+14:30:13.8 |
HIP 17068 |
19.65 |
| 2026-06-21 12:00 |
03:38:42.66 |
+14:32:00.6 |
HIP 17068 |
11.78 |
| 2026-06-22 00:00 |
03:39:16.59 |
+14:33:46.7 |
HIP 17068 |
5.77 |