| Parameter |
Value |
| Designation |
C/2022 K1 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-12-17T08:14:51.092160Z |
| Orbit solution date (soln_date, UTC) |
2022-09-27T15:43:04Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
14.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-05-30T09:54:41.385600Z |
| Discovery magnitude (MPC) |
19.70 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-07-11.0000000 |
| e |
1.00269066 |
| q (au) |
3.986818 |
| a (au) |
-1481.722941 |
| i (deg) |
41.979828 |
| Ω (om, deg) |
136.294011 |
| ω (w, deg) |
142.639740 |
| M (ma, deg) |
0.003554 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.388 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.388 |
| n |
6.000 |
| gf |
0.858 |
| gb |
-0.912 |
| k |
1.000 |
| δ90 |
4.584 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:34:59.80 |
-24:22:42.3 |
HIP 12141 |
34.32 |
| 2026-05-12 12:00 |
02:35:11.24 |
-24:22:21.3 |
HIP 12141 |
32.54 |
| 2026-05-13 00:00 |
02:35:22.67 |
-24:22:01.1 |
HIP 12141 |
30.89 |
| 2026-05-13 12:00 |
02:35:34.08 |
-24:21:41.5 |
HIP 12141 |
29.40 |
| 2026-05-14 00:00 |
02:35:45.48 |
-24:21:22.7 |
HIP 12141 |
28.08 |
| 2026-05-14 12:00 |
02:35:56.86 |
-24:21:04.6 |
HIP 12141 |
26.97 |
| 2026-05-15 00:00 |
02:36:08.22 |
-24:20:47.2 |
HIP 12141 |
26.09 |
| 2026-05-15 12:00 |
02:36:19.56 |
-24:20:30.6 |
HIP 12141 |
25.46 |
| 2026-05-16 00:00 |
02:36:30.89 |
-24:20:14.6 |
HIP 12141 |
25.10 |
| 2026-05-16 12:00 |
02:36:42.20 |
-24:19:59.4 |
HIP 12141 |
25.01 |
| 2026-05-17 00:00 |
02:36:53.48 |
-24:19:44.9 |
HIP 12141 |
25.21 |
| 2026-05-17 12:00 |
02:37:04.75 |
-24:19:31.2 |
HIP 12141 |
25.67 |
| 2026-05-18 00:00 |
02:37:16.00 |
-24:19:18.2 |
HIP 12360 |
25.23 |
| 2026-05-18 12:00 |
02:37:27.23 |
-24:19:05.9 |
HIP 12360 |
22.69 |
| 2026-05-19 00:00 |
02:37:38.43 |
-24:18:54.3 |
HIP 12360 |
20.15 |
| 2026-05-19 12:00 |
02:37:49.61 |
-24:18:43.4 |
HIP 12360 |
17.63 |
| 2026-05-20 00:00 |
02:38:00.78 |
-24:18:33.3 |
HIP 12360 |
15.11 |
| 2026-05-20 12:00 |
02:38:11.91 |
-24:18:23.9 |
HIP 12360 |
12.62 |
| 2026-05-21 00:00 |
02:38:23.03 |
-24:18:15.3 |
HIP 12360 |
10.15 |
| 2026-05-21 12:00 |
02:38:34.12 |
-24:18:07.3 |
HIP 12360 |
7.73 |
| 2026-05-22 00:00 |
02:38:45.19 |
-24:18:00.1 |
HIP 12360 |
5.41 |
| 2026-05-22 12:00 |
02:38:56.23 |
-24:17:53.7 |
HIP 12360 |
3.40 |
| 2026-05-23 00:00 |
02:39:07.24 |
-24:17:47.9 |
HIP 12360 |
2.52 |
| 2026-05-23 12:00 |
02:39:18.24 |
-24:17:42.9 |
HIP 12360 |
3.70 |
| 2026-05-24 00:00 |
02:39:29.20 |
-24:17:38.6 |
HIP 12360 |
5.79 |
| 2026-05-24 12:00 |
02:39:40.14 |
-24:17:35.1 |
HIP 12360 |
8.10 |
| 2026-05-25 00:00 |
02:39:51.05 |
-24:17:32.2 |
HIP 12360 |
10.49 |
| 2026-05-25 12:00 |
02:40:01.93 |
-24:17:30.1 |
HIP 12425 |
11.44 |
| 2026-05-26 00:00 |
02:40:12.79 |
-24:17:28.7 |
HIP 12466 |
10.28 |
| 2026-05-26 12:00 |
02:40:23.62 |
-24:17:28.1 |
HIP 12466 |
9.51 |
| 2026-05-27 00:00 |
02:40:34.41 |
-24:17:28.2 |
HIP 12466 |
9.37 |
| 2026-05-27 12:00 |
02:40:45.18 |
-24:17:29.0 |
HIP 12466 |
9.87 |
| 2026-05-28 00:00 |
02:40:55.92 |
-24:17:30.5 |
HIP 12466 |
10.91 |
| 2026-05-28 12:00 |
02:41:06.63 |
-24:17:32.7 |
HIP 12521 |
12.21 |
| 2026-05-29 00:00 |
02:41:17.31 |
-24:17:35.7 |
HIP 12521 |
12.34 |
| 2026-05-29 12:00 |
02:41:27.96 |
-24:17:39.4 |
HIP 12521 |
12.92 |
| 2026-05-30 00:00 |
02:41:38.58 |
-24:17:43.9 |
HIP 12521 |
13.89 |
| 2026-05-30 12:00 |
02:41:49.17 |
-24:17:49.0 |
HIP 12521 |
15.17 |
| 2026-05-31 00:00 |
02:41:59.72 |
-24:17:54.9 |
HIP 12521 |
16.69 |
| 2026-05-31 12:00 |
02:42:10.24 |
-24:18:01.5 |
HIP 12521 |
18.39 |
| 2026-06-01 00:00 |
02:42:20.73 |
-24:18:08.8 |
HIP 12521 |
20.21 |
| 2026-06-01 12:00 |
02:42:31.18 |
-24:18:16.9 |
HIP 12521 |
22.14 |
| 2026-06-02 00:00 |
02:42:41.61 |
-24:18:25.7 |
HIP 12521 |
24.13 |