| 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) |
| 2026-07-29 00:00 |
20:36:31.21 |
-08:23:53.2 |
HIP 101813 |
22.74 |
| 2026-07-29 12:00 |
20:36:03.68 |
-08:24:50.9 |
HIP 101813 |
28.94 |
| 2026-07-30 00:00 |
20:35:36.10 |
-08:25:49.4 |
HIP 101580 |
34.85 |
| 2026-07-30 12:00 |
20:35:08.46 |
-08:26:48.8 |
HIP 101580 |
33.43 |
| 2026-07-31 00:00 |
20:34:40.78 |
-08:27:49.1 |
HIP 101580 |
33.40 |
| 2026-07-31 12:00 |
20:34:13.05 |
-08:28:50.2 |
HIP 101351 |
31.52 |
| 2026-08-01 00:00 |
20:33:45.29 |
-08:29:52.1 |
HIP 101309 |
24.99 |
| 2026-08-01 12:00 |
20:33:17.49 |
-08:30:54.8 |
HIP 101309 |
18.45 |
| 2026-08-02 00:00 |
20:32:49.66 |
-08:31:58.3 |
HIP 101309 |
12.36 |
| 2026-08-02 12:00 |
20:32:21.81 |
-08:33:02.6 |
HIP 101309 |
7.89 |
| 2026-08-03 00:00 |
20:31:53.94 |
-08:34:07.7 |
HIP 101309 |
8.31 |
| 2026-08-03 12:00 |
20:31:26.05 |
-08:35:13.5 |
HIP 101309 |
13.18 |
| 2026-08-04 00:00 |
20:30:58.15 |
-08:36:20.0 |
HIP 101309 |
19.39 |
| 2026-08-04 12:00 |
20:30:30.25 |
-08:37:27.4 |
HIP 101024 |
24.55 |
| 2026-08-05 00:00 |
20:30:02.34 |
-08:38:35.4 |
HIP 101024 |
17.75 |
| 2026-08-05 12:00 |
20:29:34.44 |
-08:39:44.1 |
HIP 101024 |
11.19 |
| 2026-08-06 00:00 |
20:29:06.55 |
-08:40:53.5 |
HIP 101024 |
5.77 |
| 2026-08-06 12:00 |
20:28:38.67 |
-08:42:03.6 |
HIP 101024 |
6.25 |
| 2026-08-07 00:00 |
20:28:10.81 |
-08:43:14.4 |
HIP 101024 |
11.94 |
| 2026-08-07 12:00 |
20:27:42.97 |
-08:44:25.8 |
HIP 101024 |
18.54 |
| 2026-08-08 00:00 |
20:27:15.16 |
-08:45:37.8 |
HIP 101024 |
25.34 |
| 2026-08-08 12:00 |
20:26:47.38 |
-08:46:50.5 |
HIP 100680 |
30.37 |
| 2026-08-09 00:00 |
20:26:19.64 |
-08:48:03.7 |
HIP 100680 |
23.58 |
| 2026-08-09 12:00 |
20:25:51.94 |
-08:49:17.6 |
HIP 100680 |
16.95 |
| 2026-08-10 00:00 |
20:25:24.29 |
-08:50:32.0 |
HIP 100680 |
10.76 |
| 2026-08-10 12:00 |
20:24:56.70 |
-08:51:47.0 |
HIP 100680 |
6.37 |
| 2026-08-11 00:00 |
20:24:29.16 |
-08:53:02.5 |
HIP 100680 |
7.85 |
| 2026-08-11 12:00 |
20:24:01.68 |
-08:54:18.5 |
HIP 100680 |
13.35 |
| 2026-08-12 00:00 |
20:23:34.28 |
-08:55:35.0 |
HIP 100482 |
15.52 |
| 2026-08-12 12:00 |
20:23:06.94 |
-08:56:52.0 |
HIP 100482 |
8.81 |
| 2026-08-13 00:00 |
20:22:39.69 |
-08:58:09.5 |
HIP 100482 |
2.94 |
| 2026-08-13 12:00 |
20:22:12.52 |
-08:59:27.5 |
HIP 100482 |
5.77 |
| 2026-08-14 00:00 |
20:21:45.44 |
-09:00:45.8 |
HIP 100482 |
12.28 |
| 2026-08-14 12:00 |
20:21:18.45 |
-09:02:04.6 |
HIP 100482 |
18.98 |
| 2026-08-15 00:00 |
20:20:51.56 |
-09:03:23.8 |
HIP 100482 |
25.71 |
| 2026-08-15 12:00 |
20:20:24.77 |
-09:04:43.3 |
HIP 100482 |
32.43 |
| 2026-08-16 00:00 |
20:19:58.09 |
-09:06:03.3 |
HIP 100031 |
36.43 |
| 2026-08-16 12:00 |
20:19:31.52 |
-09:07:23.5 |
HIP 100031 |
31.17 |
| 2026-08-17 00:00 |
20:19:05.07 |
-09:08:44.1 |
HIP 100031 |
26.58 |
| 2026-08-17 12:00 |
20:18:38.74 |
-09:10:05.0 |
HIP 100031 |
23.06 |
| 2026-08-18 00:00 |
20:18:12.54 |
-09:11:26.2 |
HIP 100031 |
21.11 |
| 2026-08-18 12:00 |
20:17:46.47 |
-09:12:47.7 |
HIP 100031 |
21.15 |
| 2026-08-19 00:00 |
20:17:20.53 |
-09:14:09.4 |
HIP 100031 |
23.13 |