| Parameter |
Value |
| Designation |
C/2023 V5 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-12-13T21:25:38.058240Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:53Z |
| Obs used |
148 |
| NEO |
- |
| M1 |
21.400 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-11-06T03:26:34.857600Z |
| Discovery magnitude (MPC) |
17.40 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-11-07.0000000 |
| e |
1.00813865 |
| q (au) |
0.846019 |
| a (au) |
-103.950734 |
| i (deg) |
73.557595 |
| Ω (om, deg) |
31.524093 |
| ω (w, deg) |
56.987549 |
| M (ma, deg) |
-0.034309 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
6.000 |
| gf |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:24:52.95 |
-32:08:19.2 |
HIP 65539 |
29.21 |
| 2026-07-29 12:00 |
13:24:56.17 |
-32:07:52.0 |
HIP 65539 |
29.23 |
| 2026-07-30 00:00 |
13:24:59.48 |
-32:07:25.5 |
HIP 65539 |
29.26 |
| 2026-07-30 12:00 |
13:25:02.88 |
-32:06:59.7 |
HIP 65539 |
29.29 |
| 2026-07-31 00:00 |
13:25:06.39 |
-32:06:34.6 |
HIP 65539 |
29.32 |
| 2026-07-31 12:00 |
13:25:09.98 |
-32:06:10.1 |
HIP 65539 |
29.36 |
| 2026-08-01 00:00 |
13:25:13.67 |
-32:05:46.3 |
HIP 65539 |
29.41 |
| 2026-08-01 12:00 |
13:25:17.46 |
-32:05:23.2 |
HIP 65539 |
29.47 |
| 2026-08-02 00:00 |
13:25:21.34 |
-32:05:00.7 |
HIP 65539 |
29.53 |
| 2026-08-02 12:00 |
13:25:25.31 |
-32:04:39.0 |
HIP 65539 |
29.60 |
| 2026-08-03 00:00 |
13:25:29.37 |
-32:04:17.9 |
HIP 65539 |
29.69 |
| 2026-08-03 12:00 |
13:25:33.52 |
-32:03:57.5 |
HIP 65539 |
29.79 |
| 2026-08-04 00:00 |
13:25:37.77 |
-32:03:37.7 |
HIP 65539 |
29.90 |
| 2026-08-04 12:00 |
13:25:42.10 |
-32:03:18.7 |
HIP 65539 |
30.03 |
| 2026-08-05 00:00 |
13:25:46.53 |
-32:03:00.3 |
HIP 65539 |
30.18 |
| 2026-08-05 12:00 |
13:25:51.05 |
-32:02:42.6 |
HIP 65539 |
30.34 |
| 2026-08-06 00:00 |
13:25:55.65 |
-32:02:25.6 |
HIP 65539 |
30.52 |
| 2026-08-06 12:00 |
13:26:00.35 |
-32:02:09.3 |
HIP 65539 |
30.73 |
| 2026-08-07 00:00 |
13:26:05.13 |
-32:01:53.7 |
HIP 65539 |
30.95 |
| 2026-08-07 12:00 |
13:26:10.00 |
-32:01:38.7 |
HIP 65539 |
31.19 |
| 2026-08-08 00:00 |
13:26:14.96 |
-32:01:24.4 |
HIP 65539 |
31.46 |
| 2026-08-08 12:00 |
13:26:20.00 |
-32:01:10.9 |
HIP 65539 |
31.75 |
| 2026-08-09 00:00 |
13:26:25.13 |
-32:00:58.0 |
HIP 65539 |
32.07 |
| 2026-08-09 12:00 |
13:26:30.35 |
-32:00:45.7 |
HIP 65539 |
32.42 |
| 2026-08-10 00:00 |
13:26:35.65 |
-32:00:34.2 |
HIP 65539 |
32.79 |
| 2026-08-10 12:00 |
13:26:41.04 |
-32:00:23.4 |
HIP 65539 |
33.18 |
| 2026-08-11 00:00 |
13:26:46.51 |
-32:00:13.2 |
HIP 65567 |
33.28 |
| 2026-08-11 12:00 |
13:26:52.07 |
-32:00:03.8 |
HIP 65567 |
33.22 |
| 2026-08-12 00:00 |
13:26:57.71 |
-31:59:55.0 |
HIP 65567 |
33.23 |
| 2026-08-12 12:00 |
13:27:03.43 |
-31:59:46.9 |
HIP 65567 |
33.29 |
| 2026-08-13 00:00 |
13:27:09.23 |
-31:59:39.5 |
HIP 65567 |
33.41 |
| 2026-08-13 12:00 |
13:27:15.11 |
-31:59:32.8 |
HIP 65787 |
32.79 |
| 2026-08-14 00:00 |
13:27:21.08 |
-31:59:26.7 |
HIP 65787 |
31.77 |
| 2026-08-14 12:00 |
13:27:27.12 |
-31:59:21.4 |
HIP 65787 |
30.77 |
| 2026-08-15 00:00 |
13:27:33.25 |
-31:59:16.7 |
HIP 65787 |
29.79 |
| 2026-08-15 12:00 |
13:27:39.45 |
-31:59:12.7 |
HIP 65787 |
28.83 |
| 2026-08-16 00:00 |
13:27:45.73 |
-31:59:09.4 |
HIP 65787 |
27.89 |
| 2026-08-16 12:00 |
13:27:52.09 |
-31:59:06.8 |
HIP 65787 |
26.99 |
| 2026-08-17 00:00 |
13:27:58.52 |
-31:59:04.9 |
HIP 65787 |
26.13 |
| 2026-08-17 12:00 |
13:28:05.03 |
-31:59:03.6 |
HIP 65787 |
25.31 |
| 2026-08-18 00:00 |
13:28:11.62 |
-31:59:03.0 |
HIP 65787 |
24.54 |
| 2026-08-18 12:00 |
13:28:18.28 |
-31:59:03.1 |
HIP 65787 |
23.83 |
| 2026-08-19 00:00 |
13:28:25.02 |
-31:59:03.9 |
HIP 65787 |
23.19 |