| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
21:09:18.35 |
-08:34:24.0 |
HIP 104300 |
24.28 |
| 2026-06-03 00:00 |
21:09:14.34 |
-08:33:16.1 |
HIP 104300 |
22.96 |
| 2026-06-03 12:00 |
21:09:10.07 |
-08:32:09.2 |
HIP 104300 |
21.62 |
| 2026-06-04 00:00 |
21:09:05.56 |
-08:31:03.2 |
HIP 104300 |
20.24 |
| 2026-06-04 12:00 |
21:09:00.79 |
-08:29:58.1 |
HIP 104300 |
18.84 |
| 2026-06-05 00:00 |
21:08:55.78 |
-08:28:54.1 |
HIP 104300 |
17.41 |
| 2026-06-05 12:00 |
21:08:50.51 |
-08:27:50.9 |
HIP 104300 |
15.96 |
| 2026-06-06 00:00 |
21:08:44.99 |
-08:26:48.8 |
HIP 104300 |
14.50 |
| 2026-06-06 12:00 |
21:08:39.22 |
-08:25:47.6 |
HIP 104300 |
13.04 |
| 2026-06-07 00:00 |
21:08:33.19 |
-08:24:47.4 |
HIP 104300 |
11.60 |
| 2026-06-07 12:00 |
21:08:26.91 |
-08:23:48.3 |
HIP 104300 |
10.20 |
| 2026-06-08 00:00 |
21:08:20.38 |
-08:22:50.1 |
HIP 104300 |
8.90 |
| 2026-06-08 12:00 |
21:08:13.58 |
-08:21:52.9 |
HIP 104300 |
7.78 |
| 2026-06-09 00:00 |
21:08:06.54 |
-08:20:56.8 |
HIP 104300 |
6.96 |
| 2026-06-09 12:00 |
21:07:59.23 |
-08:20:01.7 |
HIP 104300 |
6.60 |
| 2026-06-10 00:00 |
21:07:51.67 |
-08:19:07.6 |
HIP 104300 |
6.82 |
| 2026-06-10 12:00 |
21:07:43.85 |
-08:18:14.6 |
HIP 104272 |
6.01 |
| 2026-06-11 00:00 |
21:07:35.77 |
-08:17:22.6 |
HIP 104272 |
4.04 |
| 2026-06-11 12:00 |
21:07:27.43 |
-08:16:31.7 |
HIP 104272 |
2.45 |
| 2026-06-12 00:00 |
21:07:18.83 |
-08:15:41.8 |
HIP 104272 |
2.44 |
| 2026-06-12 12:00 |
21:07:09.98 |
-08:14:53.0 |
HIP 104272 |
4.11 |
| 2026-06-13 00:00 |
21:07:00.86 |
-08:14:05.3 |
HIP 104272 |
6.29 |
| 2026-06-13 12:00 |
21:06:51.48 |
-08:13:18.7 |
HIP 104272 |
8.65 |
| 2026-06-14 00:00 |
21:06:41.85 |
-08:12:33.2 |
HIP 104271 |
11.01 |
| 2026-06-14 12:00 |
21:06:31.95 |
-08:11:48.8 |
HIP 104271 |
13.26 |
| 2026-06-15 00:00 |
21:06:21.79 |
-08:11:05.5 |
HIP 104271 |
15.68 |
| 2026-06-15 12:00 |
21:06:11.37 |
-08:10:23.3 |
HIP 104122 |
15.49 |
| 2026-06-16 00:00 |
21:06:00.69 |
-08:09:42.3 |
HIP 104122 |
15.00 |
| 2026-06-16 12:00 |
21:05:49.76 |
-08:09:02.3 |
HIP 104122 |
14.98 |
| 2026-06-17 00:00 |
21:05:38.56 |
-08:08:23.5 |
HIP 104122 |
15.45 |
| 2026-06-17 12:00 |
21:05:27.10 |
-08:07:45.8 |
HIP 104122 |
16.39 |
| 2026-06-18 00:00 |
21:05:15.38 |
-08:07:09.3 |
HIP 104122 |
17.78 |
| 2026-06-18 12:00 |
21:05:03.41 |
-08:06:33.9 |
HIP 104122 |
19.53 |
| 2026-06-19 00:00 |
21:04:51.17 |
-08:05:59.6 |
HIP 104122 |
21.58 |
| 2026-06-19 12:00 |
21:04:38.68 |
-08:05:26.5 |
HIP 104122 |
23.88 |
| 2026-06-20 00:00 |
21:04:25.93 |
-08:04:54.5 |
HIP 103904 |
25.28 |
| 2026-06-20 12:00 |
21:04:12.93 |
-08:04:23.7 |
HIP 103904 |
22.65 |
| 2026-06-21 00:00 |
21:03:59.67 |
-08:03:54.1 |
HIP 103904 |
20.19 |
| 2026-06-21 12:00 |
21:03:46.15 |
-08:03:25.6 |
HIP 103904 |
17.99 |
| 2026-06-22 00:00 |
21:03:32.38 |
-08:02:58.3 |
HIP 103904 |
16.19 |