| Parameter |
Value |
| Designation |
C/2022 R3 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-05T07:22:22.114560Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:44:29Z |
| Obs used |
355 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-09-15T08:35:14.697600Z |
| Discovery magnitude (MPC) |
18.96 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-08-01.0000000 |
| e |
1.00075876 |
| q (au) |
5.128952 |
| a (au) |
-6759.666695 |
| i (deg) |
43.082904 |
| Ω (om, deg) |
8.238598 |
| ω (w, deg) |
72.866685 |
| M (ma, deg) |
0.000264 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.040 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.040 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.844 |
| k |
0.800 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2023-08-17 |
2024-05-13 |
-12.5844 |
+9.340 |
| 2024-05-13 |
2026-02-25 |
-19.7422 |
+16.108 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
11:50:39.33 |
+19:13:51.7 |
HIP 57666 |
22.79 |
| 2026-03-26 12:00 |
11:50:28.05 |
+19:13:55.6 |
HIP 57666 |
21.27 |
| 2026-03-27 00:00 |
11:50:16.79 |
+19:13:58.7 |
HIP 57666 |
19.99 |
| 2026-03-27 12:00 |
11:50:05.57 |
+19:14:01.1 |
HIP 57666 |
18.98 |
| 2026-03-28 00:00 |
11:49:54.37 |
+19:14:02.8 |
HIP 57666 |
18.30 |
| 2026-03-28 12:00 |
11:49:43.21 |
+19:14:03.8 |
HIP 57666 |
17.97 |
| 2026-03-29 00:00 |
11:49:32.08 |
+19:14:04.1 |
HIP 57666 |
18.01 |
| 2026-03-29 12:00 |
11:49:20.99 |
+19:14:03.7 |
HIP 57666 |
18.42 |
| 2026-03-30 00:00 |
11:49:09.93 |
+19:14:02.6 |
HIP 57666 |
19.16 |
| 2026-03-30 12:00 |
11:48:58.92 |
+19:14:00.7 |
HIP 57666 |
20.21 |
| 2026-03-31 00:00 |
11:48:47.94 |
+19:13:58.1 |
HIP 57666 |
21.50 |
| 2026-03-31 12:00 |
11:48:37.00 |
+19:13:54.8 |
HIP 57503 |
20.74 |
| 2026-04-01 00:00 |
11:48:26.10 |
+19:13:50.8 |
HIP 57503 |
18.25 |
| 2026-04-01 12:00 |
11:48:15.24 |
+19:13:46.0 |
HIP 57503 |
15.81 |
| 2026-04-02 00:00 |
11:48:04.43 |
+19:13:40.5 |
HIP 57503 |
13.42 |
| 2026-04-02 12:00 |
11:47:53.66 |
+19:13:34.2 |
HIP 57503 |
11.12 |
| 2026-04-03 00:00 |
11:47:42.93 |
+19:13:27.3 |
HIP 57503 |
8.97 |
| 2026-04-03 12:00 |
11:47:32.26 |
+19:13:19.6 |
HIP 57503 |
7.09 |
| 2026-04-04 00:00 |
11:47:21.63 |
+19:13:11.1 |
HIP 57503 |
5.75 |
| 2026-04-04 12:00 |
11:47:11.05 |
+19:13:01.9 |
HIP 57503 |
5.34 |
| 2026-04-05 00:00 |
11:47:00.51 |
+19:12:52.0 |
HIP 57503 |
6.06 |
| 2026-04-05 12:00 |
11:46:50.03 |
+19:12:41.3 |
HIP 57503 |
7.57 |
| 2026-04-06 00:00 |
11:46:39.60 |
+19:12:29.9 |
HIP 57503 |
9.49 |
| 2026-04-06 12:00 |
11:46:29.23 |
+19:12:17.7 |
HIP 57503 |
11.62 |
| 2026-04-07 00:00 |
11:46:18.91 |
+19:12:04.8 |
HIP 57503 |
13.85 |
| 2026-04-07 12:00 |
11:46:08.64 |
+19:11:51.1 |
HIP 57503 |
16.14 |
| 2026-04-08 00:00 |
11:45:58.43 |
+19:11:36.7 |
HIP 57503 |
18.45 |
| 2026-04-08 12:00 |
11:45:48.27 |
+19:11:21.6 |
HIP 57503 |
20.79 |
| 2026-04-09 00:00 |
11:45:38.18 |
+19:11:05.6 |
HIP 57307 |
20.80 |
| 2026-04-09 12:00 |
11:45:28.14 |
+19:10:49.0 |
HIP 57307 |
20.20 |
| 2026-04-10 00:00 |
11:45:18.16 |
+19:10:31.5 |
HIP 57307 |
19.88 |
| 2026-04-10 12:00 |
11:45:08.25 |
+19:10:13.3 |
HIP 57307 |
19.85 |
| 2026-04-11 00:00 |
11:44:58.39 |
+19:09:54.4 |
HIP 57307 |
20.11 |
| 2026-04-11 12:00 |
11:44:48.60 |
+19:09:34.7 |
HIP 57307 |
20.65 |
| 2026-04-12 00:00 |
11:44:38.88 |
+19:09:14.2 |
HIP 57307 |
21.44 |
| 2026-04-12 12:00 |
11:44:29.22 |
+19:08:53.0 |
HIP 57307 |
22.45 |
| 2026-04-13 00:00 |
11:44:19.62 |
+19:08:31.0 |
HIP 57307 |
23.65 |
| 2026-04-13 12:00 |
11:44:10.09 |
+19:08:08.3 |
HIP 57307 |
25.00 |
| 2026-04-14 00:00 |
11:44:00.63 |
+19:07:44.8 |
HIP 57307 |
26.48 |
| 2026-04-14 12:00 |
11:43:51.24 |
+19:07:20.5 |
HIP 57121 |
27.14 |
| 2026-04-15 00:00 |
11:43:41.92 |
+19:06:55.5 |
HIP 57121 |
25.46 |
| 2026-04-15 12:00 |
11:43:32.67 |
+19:06:29.7 |
HIP 57121 |
23.86 |
| 2026-04-16 00:00 |
11:43:23.49 |
+19:06:03.2 |
HIP 57121 |
22.38 |