| 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) |
| 2026-03-26 00:00 |
20:46:40.42 |
-12:42:23.0 |
HIP 102493 |
8.62 |
| 2026-03-26 12:00 |
20:47:00.71 |
-12:40:15.8 |
HIP 102493 |
13.74 |
| 2026-03-27 00:00 |
20:47:20.89 |
-12:38:08.6 |
HIP 102569 |
14.98 |
| 2026-03-27 12:00 |
20:47:40.96 |
-12:36:01.4 |
HIP 102664 |
12.11 |
| 2026-03-28 00:00 |
20:48:00.92 |
-12:33:54.2 |
HIP 102664 |
7.50 |
| 2026-03-28 12:00 |
20:48:20.77 |
-12:31:47.1 |
HIP 102664 |
4.72 |
| 2026-03-29 00:00 |
20:48:40.52 |
-12:29:40.0 |
HIP 102664 |
6.63 |
| 2026-03-29 12:00 |
20:49:00.15 |
-12:27:32.9 |
HIP 102738 |
9.14 |
| 2026-03-30 00:00 |
20:49:19.66 |
-12:25:25.8 |
HIP 102738 |
11.83 |
| 2026-03-30 12:00 |
20:49:39.07 |
-12:23:18.8 |
HIP 102738 |
15.82 |
| 2026-03-31 00:00 |
20:49:58.36 |
-12:21:11.8 |
HIP 102891 |
15.62 |
| 2026-03-31 12:00 |
20:50:17.54 |
-12:19:04.9 |
HIP 102891 |
14.83 |
| 2026-04-01 00:00 |
20:50:36.60 |
-12:16:58.0 |
HIP 102891 |
15.77 |
| 2026-04-01 12:00 |
20:50:55.55 |
-12:14:51.2 |
HIP 102891 |
18.15 |
| 2026-04-02 00:00 |
20:51:14.37 |
-12:12:44.4 |
HIP 102891 |
21.48 |
| 2026-04-02 12:00 |
20:51:33.08 |
-12:10:37.7 |
HIP 102891 |
25.38 |
| 2026-04-03 00:00 |
20:51:51.67 |
-12:08:31.1 |
HIP 102891 |
29.60 |
| 2026-04-03 12:00 |
20:52:10.15 |
-12:06:24.5 |
HIP 103151 |
28.48 |
| 2026-04-04 00:00 |
20:52:28.50 |
-12:04:18.0 |
HIP 103151 |
25.44 |
| 2026-04-04 12:00 |
20:52:46.72 |
-12:02:11.6 |
HIP 103151 |
23.09 |
| 2026-04-05 00:00 |
20:53:04.83 |
-12:00:05.3 |
HIP 103151 |
21.65 |
| 2026-04-05 12:00 |
20:53:22.81 |
-11:57:59.2 |
HIP 103125 |
19.16 |
| 2026-04-06 00:00 |
20:53:40.67 |
-11:55:53.1 |
HIP 103125 |
16.60 |
| 2026-04-06 12:00 |
20:53:58.40 |
-11:53:47.1 |
HIP 103125 |
15.20 |
| 2026-04-07 00:00 |
20:54:16.01 |
-11:51:41.2 |
HIP 103125 |
15.24 |
| 2026-04-07 12:00 |
20:54:33.48 |
-11:49:35.4 |
HIP 103125 |
16.69 |
| 2026-04-08 00:00 |
20:54:50.83 |
-11:47:29.8 |
HIP 103125 |
19.22 |
| 2026-04-08 12:00 |
20:55:08.05 |
-11:45:24.3 |
HIP 103125 |
22.44 |
| 2026-04-09 00:00 |
20:55:25.14 |
-11:43:19.0 |
HIP 103280 |
24.46 |
| 2026-04-09 12:00 |
20:55:42.09 |
-11:41:13.7 |
HIP 103280 |
22.78 |
| 2026-04-10 00:00 |
20:55:58.92 |
-11:39:08.7 |
HIP 103280 |
21.97 |
| 2026-04-10 12:00 |
20:56:15.60 |
-11:37:03.8 |
HIP 103280 |
22.10 |
| 2026-04-11 00:00 |
20:56:32.16 |
-11:34:59.0 |
HIP 103280 |
23.14 |
| 2026-04-11 12:00 |
20:56:48.57 |
-11:32:54.5 |
HIP 103280 |
24.95 |
| 2026-04-12 00:00 |
20:57:04.85 |
-11:30:50.0 |
HIP 103280 |
27.37 |
| 2026-04-12 12:00 |
20:57:20.99 |
-11:28:45.8 |
HIP 103280 |
30.23 |
| 2026-04-13 00:00 |
20:57:36.99 |
-11:26:41.8 |
HIP 103487 |
31.20 |
| 2026-04-13 12:00 |
20:57:52.85 |
-11:24:38.0 |
HIP 103487 |
32.74 |
| 2026-04-14 00:00 |
20:58:08.57 |
-11:22:34.3 |
HIP 103487 |
34.76 |
| 2026-04-14 12:00 |
20:58:24.14 |
-11:20:30.9 |
HIP 103671 |
34.83 |
| 2026-04-15 00:00 |
20:58:39.57 |
-11:18:27.7 |
HIP 103671 |
30.56 |
| 2026-04-15 12:00 |
20:58:54.85 |
-11:16:24.7 |
HIP 103671 |
26.33 |
| 2026-04-16 00:00 |
20:59:09.99 |
-11:14:22.0 |
HIP 103671 |
22.14 |