255P/Levy
| 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) |
| 2026-02-03 00:00 |
20:05:22.34 |
-16:05:16.4 |
HIP 98947 |
17.12 |
| 2026-02-03 12:00 |
20:05:49.18 |
-16:03:31.3 |
HIP 98993 |
18.16 |
| 2026-02-04 00:00 |
20:06:15.99 |
-16:01:45.9 |
HIP 98993 |
17.68 |
| 2026-02-04 12:00 |
20:06:42.78 |
-16:00:00.0 |
HIP 98993 |
19.60 |
| 2026-02-05 00:00 |
20:07:09.54 |
-15:58:13.8 |
HIP 98993 |
23.34 |
| 2026-02-05 12:00 |
20:07:36.28 |
-15:56:27.2 |
HIP 99224 |
18.80 |
| 2026-02-06 00:00 |
20:08:02.99 |
-15:54:40.2 |
HIP 99224 |
13.22 |
| 2026-02-06 12:00 |
20:08:29.67 |
-15:52:52.8 |
HIP 99224 |
9.21 |
| 2026-02-07 00:00 |
20:08:56.32 |
-15:51:05.1 |
HIP 99224 |
9.13 |
| 2026-02-07 12:00 |
20:09:22.95 |
-15:49:16.9 |
HIP 99224 |
13.06 |
| 2026-02-08 00:00 |
20:09:49.54 |
-15:47:28.5 |
HIP 99224 |
18.60 |
| 2026-02-08 12:00 |
20:10:16.11 |
-15:45:39.6 |
HIP 99491 |
18.14 |
| 2026-02-09 00:00 |
20:10:42.64 |
-15:43:50.4 |
HIP 99491 |
13.36 |
| 2026-02-09 12:00 |
20:11:09.14 |
-15:42:00.8 |
HIP 99491 |
10.78 |
| 2026-02-10 00:00 |
20:11:35.60 |
-15:40:10.9 |
HIP 99474 |
11.17 |
| 2026-02-10 12:00 |
20:12:02.04 |
-15:38:20.6 |
HIP 99474 |
13.56 |
| 2026-02-11 00:00 |
20:12:28.44 |
-15:36:29.9 |
HIP 99651 |
16.85 |
| 2026-02-11 12:00 |
20:12:54.80 |
-15:34:39.0 |
HIP 99651 |
11.05 |
| 2026-02-12 00:00 |
20:13:21.13 |
-15:32:47.6 |
HIP 99651 |
6.92 |
| 2026-02-12 12:00 |
20:13:47.42 |
-15:30:55.9 |
HIP 99651 |
7.79 |
| 2026-02-13 00:00 |
20:14:13.67 |
-15:29:03.9 |
HIP 99773 |
10.32 |
| 2026-02-13 12:00 |
20:14:39.88 |
-15:27:11.5 |
HIP 99773 |
7.21 |
| 2026-02-14 00:00 |
20:15:06.05 |
-15:25:18.8 |
HIP 99773 |
9.16 |
| 2026-02-14 12:00 |
20:15:32.18 |
-15:23:25.8 |
HIP 99773 |
14.23 |
| 2026-02-15 00:00 |
20:15:58.28 |
-15:21:32.5 |
HIP 99947 |
15.68 |
| 2026-02-15 12:00 |
20:16:24.32 |
-15:19:38.8 |
HIP 99947 |
10.20 |
| 2026-02-16 00:00 |
20:16:50.33 |
-15:17:44.8 |
HIP 99947 |
6.95 |
| 2026-02-16 12:00 |
20:17:16.29 |
-15:15:50.4 |
HIP 99947 |
8.84 |
| 2026-02-17 00:00 |
20:17:42.21 |
-15:13:55.8 |
HIP 99947 |
13.91 |
| 2026-02-17 12:00 |
20:18:08.08 |
-15:12:00.9 |
HIP 99947 |
19.85 |
| 2026-02-18 00:00 |
20:18:33.91 |
-15:10:05.6 |
HIP 100244 |
20.92 |
| 2026-02-18 12:00 |
20:18:59.68 |
-15:08:10.1 |
HIP 100244 |
14.50 |
| 2026-02-19 00:00 |
20:19:25.41 |
-15:06:14.2 |
HIP 100244 |
8.26 |
| 2026-02-19 12:00 |
20:19:51.09 |
-15:04:18.1 |
HIP 100244 |
3.24 |
| 2026-02-20 00:00 |
20:20:16.72 |
-15:02:21.6 |
HIP 100244 |
6.09 |
| 2026-02-20 12:00 |
20:20:42.30 |
-15:00:24.9 |
HIP 100244 |
12.15 |
| 2026-02-21 00:00 |
20:21:07.83 |
-14:58:27.9 |
HIP 100345 |
11.71 |
| 2026-02-21 12:00 |
20:21:33.30 |
-14:56:30.6 |
HIP 100345 |
12.45 |
| 2026-02-22 00:00 |
20:21:58.72 |
-14:54:33.0 |
HIP 100345 |
15.99 |
| 2026-02-22 12:00 |
20:22:24.09 |
-14:52:35.2 |
HIP 100345 |
20.96 |
| 2026-02-23 00:00 |
20:22:49.40 |
-14:50:37.1 |
HIP 100345 |
26.55 |
| 2026-02-23 12:00 |
20:23:14.66 |
-14:48:38.7 |
HIP 100345 |
32.44 |
| 2026-02-24 00:00 |
20:23:39.86 |
-14:46:40.1 |
HIP 100556 |
31.46 |