P/2020 K9 (Lemmon-PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
13:57:22.11 |
+01:55:40.1 |
HIP 68250 |
22.76 |
| 2026-02-03 12:00 |
13:57:25.79 |
+01:57:21.0 |
HIP 68250 |
20.88 |
| 2026-02-04 00:00 |
13:57:29.31 |
+01:59:03.0 |
HIP 68250 |
19.02 |
| 2026-02-04 12:00 |
13:57:32.64 |
+02:00:46.2 |
HIP 68250 |
17.19 |
| 2026-02-05 00:00 |
13:57:35.80 |
+02:02:30.6 |
HIP 68250 |
15.40 |
| 2026-02-05 12:00 |
13:57:38.79 |
+02:04:16.1 |
HIP 68250 |
13.66 |
| 2026-02-06 00:00 |
13:57:41.60 |
+02:06:02.7 |
HIP 68250 |
12.00 |
| 2026-02-06 12:00 |
13:57:44.23 |
+02:07:50.5 |
HIP 68250 |
10.45 |
| 2026-02-07 00:00 |
13:57:46.68 |
+02:09:39.4 |
HIP 68250 |
9.07 |
| 2026-02-07 12:00 |
13:57:48.95 |
+02:11:29.4 |
HIP 68250 |
7.96 |
| 2026-02-08 00:00 |
13:57:51.05 |
+02:13:20.5 |
HIP 68250 |
7.24 |
| 2026-02-08 12:00 |
13:57:52.96 |
+02:15:12.8 |
HIP 68250 |
7.04 |
| 2026-02-09 00:00 |
13:57:54.70 |
+02:17:06.2 |
HIP 68250 |
7.41 |
| 2026-02-09 12:00 |
13:57:56.25 |
+02:19:00.7 |
HIP 68250 |
8.28 |
| 2026-02-10 00:00 |
13:57:57.63 |
+02:20:56.3 |
HIP 68250 |
9.51 |
| 2026-02-10 12:00 |
13:57:58.82 |
+02:22:53.0 |
HIP 68250 |
11.00 |
| 2026-02-11 00:00 |
13:57:59.84 |
+02:24:50.7 |
HIP 68250 |
12.65 |
| 2026-02-11 12:00 |
13:58:00.67 |
+02:26:49.6 |
HIP 68250 |
14.42 |
| 2026-02-12 00:00 |
13:58:01.32 |
+02:28:49.5 |
HIP 68250 |
16.27 |
| 2026-02-12 12:00 |
13:58:01.78 |
+02:30:50.6 |
HIP 68236 |
16.23 |
| 2026-02-13 00:00 |
13:58:02.07 |
+02:32:52.6 |
HIP 68236 |
14.20 |
| 2026-02-13 12:00 |
13:58:02.17 |
+02:34:55.7 |
HIP 68236 |
12.15 |
| 2026-02-14 00:00 |
13:58:02.09 |
+02:36:59.9 |
HIP 68236 |
10.10 |
| 2026-02-14 12:00 |
13:58:01.83 |
+02:39:05.1 |
HIP 68236 |
8.05 |
| 2026-02-15 00:00 |
13:58:01.38 |
+02:41:11.3 |
HIP 68236 |
6.01 |
| 2026-02-15 12:00 |
13:58:00.75 |
+02:43:18.6 |
HIP 68236 |
4.05 |
| 2026-02-16 00:00 |
13:57:59.94 |
+02:45:26.8 |
HIP 68236 |
2.42 |
| 2026-02-16 12:00 |
13:57:58.94 |
+02:47:36.1 |
HIP 68236 |
2.18 |
| 2026-02-17 00:00 |
13:57:57.76 |
+02:49:46.3 |
HIP 68236 |
3.66 |
| 2026-02-17 12:00 |
13:57:56.40 |
+02:51:57.5 |
HIP 68236 |
5.65 |
| 2026-02-18 00:00 |
13:57:54.85 |
+02:54:09.7 |
HIP 68236 |
7.80 |
| 2026-02-18 12:00 |
13:57:53.12 |
+02:56:22.9 |
HIP 68236 |
10.02 |
| 2026-02-19 00:00 |
13:57:51.21 |
+02:58:37.0 |
HIP 68236 |
12.29 |
| 2026-02-19 12:00 |
13:57:49.11 |
+03:00:52.0 |
HIP 68236 |
14.59 |
| 2026-02-20 00:00 |
13:57:46.83 |
+03:03:08.0 |
HIP 68236 |
16.92 |
| 2026-02-20 12:00 |
13:57:44.37 |
+03:05:24.8 |
HIP 68110 |
17.08 |
| 2026-02-21 00:00 |
13:57:41.73 |
+03:07:42.6 |
HIP 68110 |
17.47 |
| 2026-02-21 12:00 |
13:57:38.91 |
+03:10:01.3 |
HIP 68110 |
18.13 |
| 2026-02-22 00:00 |
13:57:35.90 |
+03:12:20.8 |
HIP 68110 |
19.06 |
| 2026-02-22 12:00 |
13:57:32.71 |
+03:14:41.2 |
HIP 68110 |
20.22 |
| 2026-02-23 00:00 |
13:57:29.34 |
+03:17:02.5 |
HIP 68110 |
21.59 |
| 2026-02-23 12:00 |
13:57:25.80 |
+03:19:24.6 |
HIP 68110 |
23.15 |
| 2026-02-24 00:00 |
13:57:22.07 |
+03:21:47.5 |
HIP 68110 |
24.85 |