| 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 · University of Arizona 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
$$
M_a = (14.360 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.360 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 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 |
| 2026-06-02 12:00 |
13:19:24.78 |
+09:34:22.2 |
HIP 64989 |
7.79 |
| 2026-06-03 00:00 |
13:19:18.77 |
+09:34:17.5 |
HIP 64989 |
7.31 |
| 2026-06-03 12:00 |
13:19:12.92 |
+09:34:11.3 |
HIP 64989 |
7.10 |
| 2026-06-04 00:00 |
13:19:07.24 |
+09:34:03.8 |
HIP 64989 |
7.15 |
| 2026-06-04 12:00 |
13:19:01.72 |
+09:33:54.8 |
HIP 64989 |
7.42 |
| 2026-06-05 00:00 |
13:18:56.37 |
+09:33:44.4 |
HIP 64989 |
7.89 |
| 2026-06-05 12:00 |
13:18:51.18 |
+09:33:32.5 |
HIP 64989 |
8.50 |
| 2026-06-06 00:00 |
13:18:46.16 |
+09:33:19.3 |
HIP 64989 |
9.20 |
| 2026-06-06 12:00 |
13:18:41.30 |
+09:33:04.6 |
HIP 64989 |
9.96 |
| 2026-06-07 00:00 |
13:18:36.62 |
+09:32:48.6 |
HIP 64989 |
10.76 |
| 2026-06-07 12:00 |
13:18:32.10 |
+09:32:31.1 |
HIP 64989 |
11.58 |
| 2026-06-08 00:00 |
13:18:27.74 |
+09:32:12.3 |
HIP 64989 |
12.41 |
| 2026-06-08 12:00 |
13:18:23.56 |
+09:31:52.1 |
HIP 64989 |
13.23 |
| 2026-06-09 00:00 |
13:18:19.54 |
+09:31:30.5 |
HIP 64989 |
14.04 |
| 2026-06-09 12:00 |
13:18:15.70 |
+09:31:07.6 |
HIP 64989 |
14.83 |
| 2026-06-10 00:00 |
13:18:12.02 |
+09:30:43.3 |
HIP 64989 |
15.61 |
| 2026-06-10 12:00 |
13:18:08.51 |
+09:30:17.6 |
HIP 64989 |
16.36 |
| 2026-06-11 00:00 |
13:18:05.18 |
+09:29:50.6 |
HIP 64989 |
17.09 |
| 2026-06-11 12:00 |
13:18:02.01 |
+09:29:22.2 |
HIP 64989 |
17.80 |
| 2026-06-12 00:00 |
13:17:59.01 |
+09:28:52.6 |
HIP 64792 |
18.16 |
| 2026-06-12 12:00 |
13:17:56.19 |
+09:28:21.6 |
HIP 64792 |
17.38 |
| 2026-06-13 00:00 |
13:17:53.54 |
+09:27:49.2 |
HIP 64792 |
16.65 |
| 2026-06-13 12:00 |
13:17:51.05 |
+09:27:15.6 |
HIP 64792 |
15.97 |
| 2026-06-14 00:00 |
13:17:48.74 |
+09:26:40.7 |
HIP 64792 |
15.35 |
| 2026-06-14 12:00 |
13:17:46.61 |
+09:26:04.4 |
HIP 64792 |
14.79 |
| 2026-06-15 00:00 |
13:17:44.64 |
+09:25:26.9 |
HIP 64792 |
14.29 |
| 2026-06-15 12:00 |
13:17:42.85 |
+09:24:48.1 |
HIP 64792 |
13.86 |
| 2026-06-16 00:00 |
13:17:41.23 |
+09:24:08.1 |
HIP 64792 |
13.51 |
| 2026-06-16 12:00 |
13:17:39.78 |
+09:23:26.8 |
HIP 64792 |
13.24 |
| 2026-06-17 00:00 |
13:17:38.51 |
+09:22:44.2 |
HIP 64792 |
13.05 |
| 2026-06-17 12:00 |
13:17:37.40 |
+09:22:00.4 |
HIP 64792 |
12.96 |
| 2026-06-18 00:00 |
13:17:36.47 |
+09:21:15.4 |
HIP 64792 |
12.96 |
| 2026-06-18 12:00 |
13:17:35.72 |
+09:20:29.1 |
HIP 64792 |
13.06 |
| 2026-06-19 00:00 |
13:17:35.13 |
+09:19:41.7 |
HIP 64792 |
13.25 |
| 2026-06-19 12:00 |
13:17:34.72 |
+09:18:53.0 |
HIP 64792 |
13.53 |
| 2026-06-20 00:00 |
13:17:34.48 |
+09:18:03.1 |
HIP 64792 |
13.90 |
| 2026-06-20 12:00 |
13:17:34.41 |
+09:17:12.1 |
HIP 64792 |
14.35 |
| 2026-06-21 00:00 |
13:17:34.51 |
+09:16:19.9 |
HIP 64792 |
14.89 |
| 2026-06-21 12:00 |
13:17:34.78 |
+09:15:26.5 |
HIP 64792 |
15.50 |
| 2026-06-22 00:00 |
13:17:35.23 |
+09:14:32.0 |
HIP 64806 |
15.55 |