| Parameter |
Value |
| Designation |
C/2024 G5 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-09-06T23:37:33.974400Z |
| Orbit solution date (soln_date, UTC) |
2024-05-07T20:12:02Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
14.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-04-05T03:09:00.950400Z |
| Discovery magnitude (MPC) |
20.83 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-03-23.0000000 |
| e |
0.99442966 |
| q (au) |
2.952917 |
| a (au) |
530.114505 |
| i (deg) |
50.390198 |
| Ω (om, deg) |
316.398824 |
| ω (w, deg) |
209.557081 |
| M (ma, deg) |
359.986435 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.344 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.344 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
18:03:52.33 |
-65:58:45.5 |
HIP 88509 |
12.19 |
| 2026-07-29 12:00 |
18:03:30.14 |
-65:55:51.6 |
HIP 88509 |
10.48 |
| 2026-07-30 00:00 |
18:03:08.31 |
-65:52:56.5 |
HIP 88509 |
9.88 |
| 2026-07-30 12:00 |
18:02:46.83 |
-65:50:00.3 |
HIP 88509 |
10.56 |
| 2026-07-31 00:00 |
18:02:25.71 |
-65:47:03.1 |
HIP 88509 |
12.31 |
| 2026-07-31 12:00 |
18:02:04.95 |
-65:44:04.7 |
HIP 88509 |
14.76 |
| 2026-08-01 00:00 |
18:01:44.55 |
-65:41:05.3 |
HIP 88509 |
17.61 |
| 2026-08-01 12:00 |
18:01:24.51 |
-65:38:04.9 |
HIP 88509 |
20.69 |
| 2026-08-02 00:00 |
18:01:04.82 |
-65:35:03.5 |
HIP 88509 |
23.91 |
| 2026-08-02 12:00 |
18:00:45.49 |
-65:32:01.2 |
HIP 88509 |
27.23 |
| 2026-08-03 00:00 |
18:00:26.53 |
-65:28:57.9 |
HIP 87822 |
28.82 |
| 2026-08-03 12:00 |
18:00:07.92 |
-65:25:53.6 |
HIP 87878 |
26.98 |
| 2026-08-04 00:00 |
17:59:49.68 |
-65:22:48.4 |
HIP 87878 |
23.47 |
| 2026-08-04 12:00 |
17:59:31.79 |
-65:19:42.4 |
HIP 87878 |
20.02 |
| 2026-08-05 00:00 |
17:59:14.27 |
-65:16:35.5 |
HIP 87878 |
16.67 |
| 2026-08-05 12:00 |
17:58:57.11 |
-65:13:27.7 |
HIP 87878 |
13.46 |
| 2026-08-06 00:00 |
17:58:40.30 |
-65:10:19.1 |
HIP 87878 |
10.55 |
| 2026-08-06 12:00 |
17:58:23.86 |
-65:07:09.7 |
HIP 87878 |
8.24 |
| 2026-08-07 00:00 |
17:58:07.78 |
-65:03:59.5 |
HIP 87878 |
7.13 |
| 2026-08-07 12:00 |
17:57:52.06 |
-65:00:48.6 |
HIP 87878 |
7.74 |
| 2026-08-08 00:00 |
17:57:36.70 |
-64:57:36.9 |
HIP 87878 |
9.76 |
| 2026-08-08 12:00 |
17:57:21.70 |
-64:54:24.5 |
HIP 87858 |
6.86 |
| 2026-08-09 00:00 |
17:57:07.06 |
-64:51:11.4 |
HIP 87858 |
3.29 |
| 2026-08-09 12:00 |
17:56:52.78 |
-64:47:57.6 |
HIP 87858 |
0.38 |
| 2026-08-10 00:00 |
17:56:38.86 |
-64:44:43.2 |
HIP 87858 |
3.86 |
| 2026-08-10 12:00 |
17:56:25.30 |
-64:41:28.1 |
HIP 87858 |
7.42 |
| 2026-08-11 00:00 |
17:56:12.10 |
-64:38:12.5 |
HIP 87858 |
10.97 |
| 2026-08-11 12:00 |
17:55:59.25 |
-64:34:56.2 |
HIP 87858 |
14.52 |
| 2026-08-12 00:00 |
17:55:46.77 |
-64:31:39.3 |
HIP 87858 |
18.06 |
| 2026-08-12 12:00 |
17:55:34.64 |
-64:28:21.9 |
HIP 87501 |
20.67 |
| 2026-08-13 00:00 |
17:55:22.86 |
-64:25:04.0 |
HIP 87501 |
21.25 |
| 2026-08-13 12:00 |
17:55:11.45 |
-64:21:45.6 |
HIP 87501 |
22.41 |
| 2026-08-14 00:00 |
17:55:00.38 |
-64:18:26.7 |
HIP 87600 |
22.64 |
| 2026-08-14 12:00 |
17:54:49.68 |
-64:15:07.3 |
HIP 87600 |
19.13 |
| 2026-08-15 00:00 |
17:54:39.32 |
-64:11:47.4 |
HIP 87600 |
15.63 |
| 2026-08-15 12:00 |
17:54:29.31 |
-64:08:27.2 |
HIP 87600 |
12.15 |
| 2026-08-16 00:00 |
17:54:19.66 |
-64:05:06.5 |
HIP 87600 |
8.70 |
| 2026-08-16 12:00 |
17:54:10.35 |
-64:01:45.5 |
HIP 87600 |
5.35 |
| 2026-08-17 00:00 |
17:54:01.39 |
-63:58:24.0 |
HIP 87600 |
2.51 |
| 2026-08-17 12:00 |
17:53:52.78 |
-63:55:02.3 |
HIP 87600 |
2.92 |
| 2026-08-18 00:00 |
17:53:44.51 |
-63:51:40.2 |
HIP 87600 |
5.94 |
| 2026-08-18 12:00 |
17:53:36.59 |
-63:48:17.8 |
HIP 87600 |
9.29 |
| 2026-08-19 00:00 |
17:53:29.01 |
-63:44:55.1 |
HIP 87600 |
12.72 |