| 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) |
| 2026-09-20 00:00 |
19:57:02.33 |
-10:39:19.6 |
HIP 98059 |
21.69 |
| 2026-09-20 12:00 |
19:56:52.09 |
-10:40:28.3 |
HIP 98059 |
18.92 |
| 2026-09-21 00:00 |
19:56:42.14 |
-10:41:36.3 |
HIP 98059 |
16.23 |
| 2026-09-21 12:00 |
19:56:32.51 |
-10:42:43.8 |
HIP 98059 |
13.61 |
| 2026-09-22 00:00 |
19:56:23.18 |
-10:43:50.7 |
HIP 98059 |
11.07 |
| 2026-09-22 12:00 |
19:56:14.16 |
-10:44:57.0 |
HIP 98059 |
8.60 |
| 2026-09-23 00:00 |
19:56:05.44 |
-10:46:02.6 |
HIP 98059 |
6.22 |
| 2026-09-23 12:00 |
19:55:57.03 |
-10:47:07.7 |
HIP 98059 |
3.95 |
| 2026-09-24 00:00 |
19:55:48.93 |
-10:48:12.1 |
HIP 98059 |
1.90 |
| 2026-09-24 12:00 |
19:55:41.14 |
-10:49:15.8 |
HIP 98059 |
1.33 |
| 2026-09-25 00:00 |
19:55:33.66 |
-10:50:18.9 |
HIP 98059 |
3.03 |
| 2026-09-25 12:00 |
19:55:26.48 |
-10:51:21.4 |
HIP 98059 |
5.00 |
| 2026-09-26 00:00 |
19:55:19.61 |
-10:52:23.2 |
HIP 98059 |
6.94 |
| 2026-09-26 12:00 |
19:55:13.05 |
-10:53:24.3 |
HIP 98059 |
8.84 |
| 2026-09-27 00:00 |
19:55:06.80 |
-10:54:24.8 |
HIP 98059 |
10.67 |
| 2026-09-27 12:00 |
19:55:00.85 |
-10:55:24.6 |
HIP 98059 |
12.43 |
| 2026-09-28 00:00 |
19:54:55.21 |
-10:56:23.7 |
HIP 98059 |
14.13 |
| 2026-09-28 12:00 |
19:54:49.88 |
-10:57:22.1 |
HIP 98059 |
15.76 |
| 2026-09-29 00:00 |
19:54:44.86 |
-10:58:19.8 |
HIP 98059 |
17.32 |
| 2026-09-29 12:00 |
19:54:40.15 |
-10:59:16.8 |
HIP 98059 |
18.82 |
| 2026-09-30 00:00 |
19:54:35.74 |
-11:00:13.1 |
HIP 98059 |
20.25 |
| 2026-09-30 12:00 |
19:54:31.65 |
-11:01:08.7 |
HIP 98059 |
21.61 |
| 2026-10-01 00:00 |
19:54:27.85 |
-11:02:03.5 |
HIP 98059 |
22.90 |
| 2026-10-01 12:00 |
19:54:24.37 |
-11:02:57.7 |
HIP 98059 |
24.13 |
| 2026-10-02 00:00 |
19:54:21.19 |
-11:03:51.1 |
HIP 98059 |
25.30 |
| 2026-10-02 12:00 |
19:54:18.33 |
-11:04:43.7 |
HIP 98059 |
26.40 |
| 2026-10-03 00:00 |
19:54:15.76 |
-11:05:35.6 |
HIP 98059 |
27.44 |
| 2026-10-03 12:00 |
19:54:13.51 |
-11:06:26.8 |
HIP 97801 |
27.92 |
| 2026-10-04 00:00 |
19:54:11.56 |
-11:07:17.2 |
HIP 97801 |
27.76 |
| 2026-10-04 12:00 |
19:54:09.92 |
-11:08:06.8 |
HIP 97801 |
27.69 |
| 2026-10-05 00:00 |
19:54:08.58 |
-11:08:55.6 |
HIP 97801 |
27.72 |
| 2026-10-05 12:00 |
19:54:07.55 |
-11:09:43.7 |
HIP 97801 |
27.83 |
| 2026-10-06 00:00 |
19:54:06.83 |
-11:10:31.0 |
HIP 97801 |
28.03 |
| 2026-10-06 12:00 |
19:54:06.41 |
-11:11:17.5 |
HIP 97794 |
27.98 |
| 2026-10-07 00:00 |
19:54:06.29 |
-11:12:03.1 |
HIP 97794 |
27.67 |
| 2026-10-07 12:00 |
19:54:06.48 |
-11:12:48.0 |
HIP 97794 |
27.45 |
| 2026-10-08 00:00 |
19:54:06.98 |
-11:13:32.1 |
HIP 97794 |
27.33 |
| 2026-10-08 12:00 |
19:54:07.77 |
-11:14:15.3 |
HIP 97794 |
27.30 |
| 2026-10-09 00:00 |
19:54:08.87 |
-11:14:57.7 |
HIP 97794 |
27.37 |
| 2026-10-09 12:00 |
19:54:10.27 |
-11:15:39.3 |
HIP 97794 |
27.53 |
| 2026-10-10 00:00 |
19:54:11.98 |
-11:16:20.0 |
HIP 97794 |
27.79 |
| 2026-10-10 12:00 |
19:54:13.98 |
-11:17:00.0 |
HIP 97794 |
28.15 |
| 2026-10-11 00:00 |
19:54:16.28 |
-11:17:38.9 |
HIP 97794 |
28.60 |