| Parameter |
Value |
| Designation |
P/2018 VN2 (Leonard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-06-05T13:08:23.697600Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:18Z |
| Obs used |
178 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
18.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-07-30.0000000 |
| e |
0.47805718 |
| q (au) |
2.120598 |
| a (au) |
4.062894 |
| i (deg) |
18.238839 |
| Ω (om, deg) |
226.523835 |
| ω (w, deg) |
138.752403 |
| M (ma, deg) |
94.530258 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:23:01.61 |
+26:19:57.5 |
HIP 6434 |
14.81 |
| 2026-07-29 12:00 |
01:23:42.62 |
+26:23:32.7 |
HIP 6434 |
17.78 |
| 2026-07-30 00:00 |
01:24:23.41 |
+26:27:05.3 |
HIP 6434 |
24.60 |
| 2026-07-30 12:00 |
01:25:03.98 |
+26:30:35.3 |
HIP 6678 |
23.53 |
| 2026-07-31 00:00 |
01:25:44.32 |
+26:34:02.7 |
HIP 6678 |
18.68 |
| 2026-07-31 12:00 |
01:26:24.44 |
+26:37:27.5 |
HIP 6678 |
18.18 |
| 2026-08-01 00:00 |
01:27:04.32 |
+26:40:49.6 |
HIP 6678 |
22.24 |
| 2026-08-01 12:00 |
01:27:43.97 |
+26:44:09.1 |
HIP 6678 |
28.94 |
| 2026-08-02 00:00 |
01:28:23.38 |
+26:47:25.9 |
HIP 6736 |
35.23 |
| 2026-08-02 12:00 |
01:29:02.55 |
+26:50:39.9 |
HIP 7049 |
32.66 |
| 2026-08-03 00:00 |
01:29:41.47 |
+26:53:51.3 |
HIP 7049 |
29.50 |
| 2026-08-03 12:00 |
01:30:20.15 |
+26:56:59.8 |
HIP 7049 |
29.05 |
| 2026-08-04 00:00 |
01:30:58.58 |
+27:00:05.6 |
HIP 7049 |
31.36 |
| 2026-08-04 12:00 |
01:31:36.75 |
+27:03:08.6 |
HIP 7287 |
32.32 |
| 2026-08-05 00:00 |
01:32:14.66 |
+27:06:08.7 |
HIP 7287 |
23.36 |
| 2026-08-05 12:00 |
01:32:52.31 |
+27:09:06.0 |
HIP 7287 |
14.48 |
| 2026-08-06 00:00 |
01:33:29.70 |
+27:12:00.4 |
HIP 7287 |
5.68 |
| 2026-08-06 12:00 |
01:34:06.82 |
+27:14:51.8 |
HIP 7287 |
3.08 |
| 2026-08-07 00:00 |
01:34:43.67 |
+27:17:40.4 |
HIP 7287 |
11.72 |
| 2026-08-07 12:00 |
01:35:20.24 |
+27:20:26.0 |
HIP 7482 |
15.04 |
| 2026-08-08 00:00 |
01:35:56.54 |
+27:23:08.5 |
HIP 7482 |
10.69 |
| 2026-08-08 12:00 |
01:36:32.55 |
+27:25:48.1 |
HIP 7482 |
12.06 |
| 2026-08-09 00:00 |
01:37:08.27 |
+27:28:24.7 |
HIP 7482 |
17.77 |
| 2026-08-09 12:00 |
01:37:43.71 |
+27:30:58.1 |
HIP 7708 |
24.71 |
| 2026-08-10 00:00 |
01:38:18.85 |
+27:33:28.5 |
HIP 7708 |
17.11 |
| 2026-08-10 12:00 |
01:38:53.70 |
+27:35:55.8 |
HIP 7708 |
10.50 |
| 2026-08-11 00:00 |
01:39:28.25 |
+27:38:19.9 |
HIP 7708 |
7.71 |
| 2026-08-11 12:00 |
01:40:02.49 |
+27:40:40.8 |
HIP 7708 |
11.66 |
| 2026-08-12 00:00 |
01:40:36.43 |
+27:42:58.5 |
HIP 7708 |
18.34 |
| 2026-08-12 12:00 |
01:41:10.06 |
+27:45:13.1 |
HIP 7708 |
25.62 |
| 2026-08-13 00:00 |
01:41:43.37 |
+27:47:24.3 |
HIP 8043 |
20.63 |
| 2026-08-13 12:00 |
01:42:16.37 |
+27:49:32.3 |
HIP 8043 |
13.13 |
| 2026-08-14 00:00 |
01:42:49.06 |
+27:51:37.0 |
HIP 8043 |
5.97 |
| 2026-08-14 12:00 |
01:43:21.42 |
+27:53:38.3 |
HIP 8043 |
3.36 |
| 2026-08-15 00:00 |
01:43:53.45 |
+27:55:36.3 |
HIP 8069 |
8.10 |
| 2026-08-15 12:00 |
01:44:25.16 |
+27:57:31.0 |
HIP 8069 |
11.42 |
| 2026-08-16 00:00 |
01:44:56.54 |
+27:59:22.2 |
HIP 8069 |
17.27 |
| 2026-08-16 12:00 |
01:45:27.59 |
+28:01:10.0 |
HIP 8069 |
23.78 |
| 2026-08-17 00:00 |
01:45:58.30 |
+28:02:54.3 |
HIP 8153 |
28.69 |
| 2026-08-17 12:00 |
01:46:28.67 |
+28:04:35.2 |
HIP 8356 |
29.15 |
| 2026-08-18 00:00 |
01:46:58.70 |
+28:06:12.6 |
HIP 8356 |
24.58 |
| 2026-08-18 12:00 |
01:47:28.39 |
+28:07:46.5 |
HIP 8356 |
21.33 |
| 2026-08-19 00:00 |
01:47:57.73 |
+28:09:16.8 |
HIP 8356 |
19.93 |