| Parameter |
Value |
| Designation |
255P/Levy |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-10-07T09:13:57.613440Z |
| Orbit solution date (soln_date, UTC) |
2021-10-18T22:42:54Z |
| Obs used |
503 |
| NEO |
Yes |
| M1 |
11.500 |
| K1 |
38.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-12-22.0000000 |
| e |
0.67200978 |
| q (au) |
0.992018 |
| a (au) |
3.024534 |
| i (deg) |
18.333043 |
| Ω (om, deg) |
279.780048 |
| ω (w, deg) |
179.592955 |
| M (ma, deg) |
82.561191 |
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) |
| 2026-05-12 00:00 |
21:08:28.48 |
-09:36:00.2 |
HIP 104331 |
26.71 |
| 2026-05-12 12:00 |
21:08:34.31 |
-09:34:19.1 |
HIP 104331 |
25.45 |
| 2026-05-13 00:00 |
21:08:39.92 |
-09:32:38.7 |
HIP 104331 |
24.32 |
| 2026-05-13 12:00 |
21:08:45.33 |
-09:30:58.9 |
HIP 104331 |
23.32 |
| 2026-05-14 00:00 |
21:08:50.52 |
-09:29:19.8 |
HIP 104331 |
22.46 |
| 2026-05-14 12:00 |
21:08:55.51 |
-09:27:41.2 |
HIP 104331 |
21.75 |
| 2026-05-15 00:00 |
21:09:00.28 |
-09:26:03.4 |
HIP 104331 |
21.19 |
| 2026-05-15 12:00 |
21:09:04.84 |
-09:24:26.1 |
HIP 104331 |
20.78 |
| 2026-05-16 00:00 |
21:09:09.18 |
-09:22:49.5 |
HIP 104331 |
20.52 |
| 2026-05-16 12:00 |
21:09:13.31 |
-09:21:13.6 |
HIP 104331 |
20.40 |
| 2026-05-17 00:00 |
21:09:17.22 |
-09:19:38.4 |
HIP 104331 |
20.41 |
| 2026-05-17 12:00 |
21:09:20.92 |
-09:18:03.9 |
HIP 104331 |
20.55 |
| 2026-05-18 00:00 |
21:09:24.39 |
-09:16:30.0 |
HIP 104331 |
20.80 |
| 2026-05-18 12:00 |
21:09:27.64 |
-09:14:56.9 |
HIP 104557 |
20.53 |
| 2026-05-19 00:00 |
21:09:30.68 |
-09:13:24.4 |
HIP 104557 |
20.36 |
| 2026-05-19 12:00 |
21:09:33.49 |
-09:11:52.7 |
HIP 104557 |
20.38 |
| 2026-05-20 00:00 |
21:09:36.07 |
-09:10:21.7 |
HIP 104557 |
20.58 |
| 2026-05-20 12:00 |
21:09:38.44 |
-09:08:51.4 |
HIP 104557 |
20.94 |
| 2026-05-21 00:00 |
21:09:40.57 |
-09:07:21.9 |
HIP 104557 |
21.45 |
| 2026-05-21 12:00 |
21:09:42.49 |
-09:05:53.1 |
HIP 104557 |
22.09 |
| 2026-05-22 00:00 |
21:09:44.17 |
-09:04:25.1 |
HIP 104557 |
22.85 |
| 2026-05-22 12:00 |
21:09:45.63 |
-09:02:57.8 |
HIP 104557 |
23.71 |
| 2026-05-23 00:00 |
21:09:46.86 |
-09:01:31.3 |
HIP 104557 |
24.66 |
| 2026-05-23 12:00 |
21:09:47.86 |
-09:00:05.6 |
HIP 104557 |
25.67 |
| 2026-05-24 00:00 |
21:09:48.63 |
-08:58:40.6 |
HIP 104557 |
26.75 |
| 2026-05-24 12:00 |
21:09:49.17 |
-08:57:16.4 |
HIP 104557 |
27.87 |
| 2026-05-25 00:00 |
21:09:49.47 |
-08:55:53.1 |
HIP 104557 |
29.04 |
| 2026-05-25 12:00 |
21:09:49.55 |
-08:54:30.5 |
HIP 104331 |
30.21 |
| 2026-05-26 00:00 |
21:09:49.39 |
-08:53:08.7 |
HIP 104331 |
30.90 |
| 2026-05-26 12:00 |
21:09:48.99 |
-08:51:47.8 |
HIP 104331 |
31.58 |
| 2026-05-27 00:00 |
21:09:48.36 |
-08:50:27.6 |
HIP 104331 |
32.24 |
| 2026-05-27 12:00 |
21:09:47.50 |
-08:49:08.3 |
HIP 104331 |
32.89 |
| 2026-05-28 00:00 |
21:09:46.39 |
-08:47:49.9 |
HIP 104331 |
33.53 |
| 2026-05-28 12:00 |
21:09:45.05 |
-08:46:32.2 |
HIP 104331 |
34.16 |
| 2026-05-29 00:00 |
21:09:43.47 |
-08:45:15.5 |
HIP 104331 |
34.77 |
| 2026-05-29 12:00 |
21:09:41.65 |
-08:43:59.6 |
HIP 104300 |
33.77 |
| 2026-05-30 00:00 |
21:09:39.59 |
-08:42:44.5 |
HIP 104300 |
32.68 |
| 2026-05-30 12:00 |
21:09:37.29 |
-08:41:30.3 |
HIP 104300 |
31.57 |
| 2026-05-31 00:00 |
21:09:34.74 |
-08:40:17.0 |
HIP 104300 |
30.42 |
| 2026-05-31 12:00 |
21:09:31.96 |
-08:39:04.6 |
HIP 104300 |
29.25 |
| 2026-06-01 00:00 |
21:09:28.92 |
-08:37:53.1 |
HIP 104300 |
28.05 |
| 2026-06-01 12:00 |
21:09:25.65 |
-08:36:42.5 |
HIP 104300 |
26.83 |
| 2026-06-02 00:00 |
21:09:22.12 |
-08:35:32.8 |
HIP 104300 |
25.57 |