| 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) |
| 2026-03-26 00:00 |
13:48:38.51 |
+06:00:25.0 |
HIP 67461 |
23.84 |
| 2026-03-26 12:00 |
13:48:25.55 |
+06:03:08.0 |
HIP 67291 |
21.15 |
| 2026-03-27 00:00 |
13:48:12.48 |
+06:05:50.7 |
HIP 67291 |
16.97 |
| 2026-03-27 12:00 |
13:47:59.31 |
+06:08:33.1 |
HIP 67291 |
12.83 |
| 2026-03-28 00:00 |
13:47:46.05 |
+06:11:15.1 |
HIP 67291 |
8.78 |
| 2026-03-28 12:00 |
13:47:32.68 |
+06:13:56.8 |
HIP 67291 |
5.09 |
| 2026-03-29 00:00 |
13:47:19.23 |
+06:16:38.2 |
HIP 67291 |
3.38 |
| 2026-03-29 12:00 |
13:47:05.68 |
+06:19:19.1 |
HIP 67246 |
2.68 |
| 2026-03-30 00:00 |
13:46:52.04 |
+06:21:59.7 |
HIP 67246 |
1.64 |
| 2026-03-30 12:00 |
13:46:38.31 |
+06:24:39.8 |
HIP 67246 |
5.97 |
| 2026-03-31 00:00 |
13:46:24.50 |
+06:27:19.5 |
HIP 67246 |
10.32 |
| 2026-03-31 12:00 |
13:46:10.60 |
+06:29:58.8 |
HIP 67246 |
14.67 |
| 2026-04-01 00:00 |
13:45:56.63 |
+06:32:37.5 |
HIP 67246 |
19.04 |
| 2026-04-01 12:00 |
13:45:42.57 |
+06:35:15.8 |
HIP 67246 |
23.41 |
| 2026-04-02 00:00 |
13:45:28.44 |
+06:37:53.5 |
HIP 67246 |
27.80 |
| 2026-04-02 12:00 |
13:45:14.23 |
+06:40:30.7 |
HIP 67246 |
32.19 |
| 2026-04-03 00:00 |
13:44:59.95 |
+06:43:07.3 |
HIP 66921 |
36.02 |
| 2026-04-03 12:00 |
13:44:45.60 |
+06:45:43.3 |
HIP 66921 |
31.64 |
| 2026-04-04 00:00 |
13:44:31.18 |
+06:48:18.8 |
HIP 66921 |
27.26 |
| 2026-04-04 12:00 |
13:44:16.70 |
+06:50:53.6 |
HIP 66921 |
22.89 |
| 2026-04-05 00:00 |
13:44:02.15 |
+06:53:27.8 |
HIP 66921 |
18.54 |
| 2026-04-05 12:00 |
13:43:47.54 |
+06:56:01.3 |
HIP 66921 |
14.23 |
| 2026-04-06 00:00 |
13:43:32.87 |
+06:58:34.1 |
HIP 66921 |
10.01 |
| 2026-04-06 12:00 |
13:43:18.15 |
+07:01:06.3 |
HIP 66921 |
6.10 |
| 2026-04-07 00:00 |
13:43:03.37 |
+07:03:37.7 |
HIP 66921 |
3.70 |
| 2026-04-07 12:00 |
13:42:48.54 |
+07:06:08.3 |
HIP 66921 |
5.45 |
| 2026-04-08 00:00 |
13:42:33.67 |
+07:08:38.3 |
HIP 66921 |
9.24 |
| 2026-04-08 12:00 |
13:42:18.74 |
+07:11:07.4 |
HIP 66921 |
13.44 |
| 2026-04-09 00:00 |
13:42:03.77 |
+07:13:35.7 |
HIP 66921 |
17.77 |
| 2026-04-09 12:00 |
13:41:48.76 |
+07:16:03.2 |
HIP 66788 |
21.95 |
| 2026-04-10 00:00 |
13:41:33.71 |
+07:18:29.9 |
HIP 66788 |
18.56 |
| 2026-04-10 12:00 |
13:41:18.63 |
+07:20:55.7 |
HIP 66788 |
15.72 |
| 2026-04-11 00:00 |
13:41:03.51 |
+07:23:20.7 |
HIP 66788 |
13.79 |
| 2026-04-11 12:00 |
13:40:48.36 |
+07:25:44.7 |
HIP 66788 |
13.16 |
| 2026-04-12 00:00 |
13:40:33.18 |
+07:28:07.9 |
HIP 66661 |
11.26 |
| 2026-04-12 12:00 |
13:40:17.97 |
+07:30:30.1 |
HIP 66661 |
10.47 |
| 2026-04-13 00:00 |
13:40:02.74 |
+07:32:51.3 |
HIP 66661 |
11.47 |
| 2026-04-13 12:00 |
13:39:47.49 |
+07:35:11.6 |
HIP 66661 |
13.88 |
| 2026-04-14 00:00 |
13:39:32.22 |
+07:37:30.9 |
HIP 66661 |
17.11 |
| 2026-04-14 12:00 |
13:39:16.93 |
+07:39:49.1 |
HIP 66661 |
20.78 |
| 2026-04-15 00:00 |
13:39:01.63 |
+07:42:06.4 |
HIP 66661 |
24.69 |
| 2026-04-15 12:00 |
13:38:46.32 |
+07:44:22.6 |
HIP 66413 |
27.10 |
| 2026-04-16 00:00 |
13:38:31.00 |
+07:46:37.7 |
HIP 66413 |
23.26 |