| 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 · University of Arizona 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
$$
M_a = (7.351 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.351 |
| n |
6.000 |
| gf |
0.871 |
| gb |
-0.912 |
| k |
1.000 |
| δ90 |
5.456 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
02:42:51.99 |
-24:18:35.2 |
HIP 12797 |
22.97 |
| 2026-06-03 00:00 |
02:43:02.35 |
-24:18:45.4 |
HIP 12797 |
20.66 |
| 2026-06-03 12:00 |
02:43:12.66 |
-24:18:56.4 |
HIP 12797 |
18.37 |
| 2026-06-04 00:00 |
02:43:22.94 |
-24:19:08.0 |
HIP 12797 |
16.11 |
| 2026-06-04 12:00 |
02:43:33.19 |
-24:19:20.4 |
HIP 12797 |
13.87 |
| 2026-06-05 00:00 |
02:43:43.40 |
-24:19:33.6 |
HIP 12797 |
11.67 |
| 2026-06-05 12:00 |
02:43:53.57 |
-24:19:47.4 |
HIP 12797 |
9.55 |
| 2026-06-06 00:00 |
02:44:03.71 |
-24:20:02.0 |
HIP 12797 |
7.54 |
| 2026-06-06 12:00 |
02:44:13.81 |
-24:20:17.3 |
HIP 12797 |
5.76 |
| 2026-06-07 00:00 |
02:44:23.87 |
-24:20:33.3 |
HIP 12797 |
4.50 |
| 2026-06-07 12:00 |
02:44:33.89 |
-24:20:50.1 |
HIP 12797 |
4.22 |
| 2026-06-08 00:00 |
02:44:43.87 |
-24:21:07.6 |
HIP 12797 |
5.08 |
| 2026-06-08 12:00 |
02:44:53.82 |
-24:21:25.8 |
HIP 12797 |
6.64 |
| 2026-06-09 00:00 |
02:45:03.72 |
-24:21:44.7 |
HIP 12797 |
8.52 |
| 2026-06-09 12:00 |
02:45:13.58 |
-24:22:04.3 |
HIP 12797 |
10.54 |
| 2026-06-10 00:00 |
02:45:23.41 |
-24:22:24.7 |
HIP 12797 |
12.64 |
| 2026-06-10 12:00 |
02:45:33.19 |
-24:22:45.8 |
HIP 12797 |
14.77 |
| 2026-06-11 00:00 |
02:45:42.93 |
-24:23:07.6 |
HIP 12864 |
16.65 |
| 2026-06-11 12:00 |
02:45:52.62 |
-24:23:30.1 |
HIP 12864 |
17.04 |
| 2026-06-12 00:00 |
02:46:02.28 |
-24:23:53.4 |
HIP 12864 |
17.69 |
| 2026-06-12 12:00 |
02:46:11.89 |
-24:24:17.4 |
HIP 12864 |
18.58 |
| 2026-06-13 00:00 |
02:46:21.45 |
-24:24:42.1 |
HIP 12864 |
19.66 |
| 2026-06-13 12:00 |
02:46:30.98 |
-24:25:07.5 |
HIP 12864 |
20.90 |
| 2026-06-14 00:00 |
02:46:40.46 |
-24:25:33.7 |
HIP 12864 |
22.28 |
| 2026-06-14 12:00 |
02:46:49.89 |
-24:26:00.5 |
HIP 12864 |
23.76 |
| 2026-06-15 00:00 |
02:46:59.28 |
-24:26:28.1 |
HIP 13066 |
25.27 |
| 2026-06-15 12:00 |
02:47:08.62 |
-24:26:56.4 |
HIP 13066 |
23.81 |
| 2026-06-16 00:00 |
02:47:17.91 |
-24:27:25.4 |
HIP 13066 |
22.45 |
| 2026-06-16 12:00 |
02:47:27.16 |
-24:27:55.1 |
HIP 13066 |
21.22 |
| 2026-06-17 00:00 |
02:47:36.36 |
-24:28:25.5 |
HIP 13134 |
19.82 |
| 2026-06-17 12:00 |
02:47:45.51 |
-24:28:56.7 |
HIP 13134 |
17.72 |
| 2026-06-18 00:00 |
02:47:54.61 |
-24:29:28.5 |
HIP 13134 |
15.62 |
| 2026-06-18 12:00 |
02:48:03.66 |
-24:30:01.1 |
HIP 13134 |
13.55 |
| 2026-06-19 00:00 |
02:48:12.67 |
-24:30:34.3 |
HIP 13134 |
11.50 |
| 2026-06-19 12:00 |
02:48:21.62 |
-24:31:08.3 |
HIP 13134 |
9.49 |
| 2026-06-20 00:00 |
02:48:30.52 |
-24:31:42.9 |
HIP 13134 |
7.53 |
| 2026-06-20 12:00 |
02:48:39.38 |
-24:32:18.3 |
HIP 13134 |
5.68 |
| 2026-06-21 00:00 |
02:48:48.18 |
-24:32:54.3 |
HIP 13134 |
4.07 |
| 2026-06-21 12:00 |
02:48:56.93 |
-24:33:31.0 |
HIP 13134 |
3.08 |
| 2026-06-22 00:00 |
02:49:05.63 |
-24:34:08.4 |
HIP 13134 |
3.32 |