| Parameter |
Value |
| Designation |
P/2020 K9 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-11T15:05:58.525440Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:04Z |
| Obs used |
133 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-22T10:22:34.176000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-08-21.0000000 |
| e |
0.32212437 |
| q (au) |
2.849537 |
| a (au) |
4.203629 |
| i (deg) |
23.202607 |
| Ω (om, deg) |
166.242195 |
| ω (w, deg) |
196.834702 |
| M (ma, deg) |
340.029714 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.359 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.359 |
| n |
2.000 |
| gf |
0.987 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
13:26:07.09 |
+09:13:46.8 |
HIP 65646 |
20.69 |
| 2026-05-12 12:00 |
13:25:54.87 |
+09:14:48.4 |
HIP 65646 |
23.79 |
| 2026-05-13 00:00 |
13:25:42.78 |
+09:15:48.5 |
HIP 65490 |
22.55 |
| 2026-05-13 12:00 |
13:25:30.79 |
+09:16:47.0 |
HIP 65490 |
21.06 |
| 2026-05-14 00:00 |
13:25:18.93 |
+09:17:43.9 |
HIP 65490 |
19.97 |
| 2026-05-14 12:00 |
13:25:07.19 |
+09:18:39.3 |
HIP 65490 |
19.34 |
| 2026-05-15 00:00 |
13:24:55.57 |
+09:19:33.0 |
HIP 65490 |
19.19 |
| 2026-05-15 12:00 |
13:24:44.08 |
+09:20:25.2 |
HIP 65490 |
19.52 |
| 2026-05-16 00:00 |
13:24:32.71 |
+09:21:15.8 |
HIP 65490 |
20.28 |
| 2026-05-16 12:00 |
13:24:21.47 |
+09:22:04.8 |
HIP 65490 |
21.41 |
| 2026-05-17 00:00 |
13:24:10.36 |
+09:22:52.2 |
HIP 65490 |
22.85 |
| 2026-05-17 12:00 |
13:23:59.38 |
+09:23:38.0 |
HIP 65490 |
24.53 |
| 2026-05-18 00:00 |
13:23:48.54 |
+09:24:22.2 |
HIP 65490 |
26.38 |
| 2026-05-18 12:00 |
13:23:37.83 |
+09:25:04.8 |
HIP 65490 |
28.37 |
| 2026-05-19 00:00 |
13:23:27.25 |
+09:25:45.9 |
HIP 65490 |
30.45 |
| 2026-05-19 12:00 |
13:23:16.81 |
+09:26:25.4 |
HIP 65490 |
32.60 |
| 2026-05-20 00:00 |
13:23:06.51 |
+09:27:03.2 |
HIP 65490 |
34.79 |
| 2026-05-20 12:00 |
13:22:56.35 |
+09:27:39.5 |
HIP 65263 |
35.31 |
| 2026-05-21 00:00 |
13:22:46.33 |
+09:28:14.3 |
HIP 65263 |
35.51 |
| 2026-05-21 12:00 |
13:22:36.46 |
+09:28:47.4 |
HIP 65263 |
35.85 |
| 2026-05-22 00:00 |
13:22:26.72 |
+09:29:19.0 |
HIP 65133 |
35.73 |
| 2026-05-22 12:00 |
13:22:17.14 |
+09:29:49.0 |
HIP 65133 |
33.81 |
| 2026-05-23 00:00 |
13:22:07.70 |
+09:30:17.4 |
HIP 65133 |
32.01 |
| 2026-05-23 12:00 |
13:21:58.40 |
+09:30:44.3 |
HIP 65133 |
30.32 |
| 2026-05-24 00:00 |
13:21:49.26 |
+09:31:09.7 |
HIP 65133 |
28.77 |
| 2026-05-24 12:00 |
13:21:40.26 |
+09:31:33.4 |
HIP 65133 |
27.36 |
| 2026-05-25 00:00 |
13:21:31.41 |
+09:31:55.7 |
HIP 65133 |
26.11 |
| 2026-05-25 12:00 |
13:21:22.72 |
+09:32:16.4 |
HIP 65133 |
25.03 |
| 2026-05-26 00:00 |
13:21:14.17 |
+09:32:35.5 |
HIP 65133 |
24.13 |
| 2026-05-26 12:00 |
13:21:05.78 |
+09:32:53.2 |
HIP 65133 |
23.42 |
| 2026-05-27 00:00 |
13:20:57.55 |
+09:33:09.3 |
HIP 65133 |
22.91 |
| 2026-05-27 12:00 |
13:20:49.46 |
+09:33:23.8 |
HIP 65133 |
22.60 |
| 2026-05-28 00:00 |
13:20:41.54 |
+09:33:36.9 |
HIP 65133 |
22.48 |
| 2026-05-28 12:00 |
13:20:33.76 |
+09:33:48.5 |
HIP 64989 |
20.88 |
| 2026-05-29 00:00 |
13:20:26.15 |
+09:33:58.5 |
HIP 64989 |
19.17 |
| 2026-05-29 12:00 |
13:20:18.69 |
+09:34:07.1 |
HIP 64989 |
17.52 |
| 2026-05-30 00:00 |
13:20:11.39 |
+09:34:14.1 |
HIP 64989 |
15.94 |
| 2026-05-30 12:00 |
13:20:04.25 |
+09:34:19.7 |
HIP 64989 |
14.44 |
| 2026-05-31 00:00 |
13:19:57.27 |
+09:34:23.8 |
HIP 64989 |
13.02 |
| 2026-05-31 12:00 |
13:19:50.45 |
+09:34:26.4 |
HIP 64989 |
11.69 |
| 2026-06-01 00:00 |
13:19:43.79 |
+09:34:27.5 |
HIP 64989 |
10.48 |
| 2026-06-01 12:00 |
13:19:37.29 |
+09:34:27.2 |
HIP 64989 |
9.40 |
| 2026-06-02 00:00 |
13:19:30.96 |
+09:34:25.4 |
HIP 64989 |
8.49 |