135P/Shoemaker-Levy 8
| Parameter |
Value |
| Designation |
135P/Shoemaker-Levy 8 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1999-12-10T12:02:32.936640Z |
| Orbit solution date (soln_date, UTC) |
2024-03-14T08:42:34Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
17.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-02-21.0000000 |
| e |
0.29022851 |
| q (au) |
2.716890 |
| a (au) |
3.827837 |
| i (deg) |
6.050581 |
| Ω (om, deg) |
213.361982 |
| ω (w, deg) |
22.698035 |
| M (ma, deg) |
225.433199 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.639 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.639 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.719 |
| k |
0.800 |
| δ90 |
9.999 |
| 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 |
03:01:53.05 |
+14:20:24.8 |
HIP 14236 |
25.52 |
| 2026-02-03 12:00 |
03:02:00.48 |
+14:20:59.4 |
HIP 14236 |
23.63 |
| 2026-02-04 00:00 |
03:02:08.09 |
+14:21:34.8 |
HIP 14236 |
21.69 |
| 2026-02-04 12:00 |
03:02:15.90 |
+14:22:10.9 |
HIP 14236 |
19.71 |
| 2026-02-05 00:00 |
03:02:23.89 |
+14:22:47.9 |
HIP 14236 |
17.67 |
| 2026-02-05 12:00 |
03:02:32.08 |
+14:23:25.6 |
HIP 14236 |
15.60 |
| 2026-02-06 00:00 |
03:02:40.45 |
+14:24:04.0 |
HIP 14236 |
13.47 |
| 2026-02-06 12:00 |
03:02:49.00 |
+14:24:43.2 |
HIP 14236 |
11.30 |
| 2026-02-07 00:00 |
03:02:57.74 |
+14:25:23.2 |
HIP 14236 |
9.08 |
| 2026-02-07 12:00 |
03:03:06.67 |
+14:26:03.9 |
HIP 14236 |
6.81 |
| 2026-02-08 00:00 |
03:03:15.78 |
+14:26:45.3 |
HIP 14236 |
4.50 |
| 2026-02-08 12:00 |
03:03:25.07 |
+14:27:27.4 |
HIP 14236 |
2.15 |
| 2026-02-09 00:00 |
03:03:34.55 |
+14:28:10.3 |
HIP 14236 |
0.30 |
| 2026-02-09 12:00 |
03:03:44.20 |
+14:28:53.9 |
HIP 14236 |
2.71 |
| 2026-02-10 00:00 |
03:03:54.04 |
+14:29:38.2 |
HIP 14236 |
5.20 |
| 2026-02-10 12:00 |
03:04:04.06 |
+14:30:23.2 |
HIP 14236 |
7.74 |
| 2026-02-11 00:00 |
03:04:14.26 |
+14:31:09.0 |
HIP 14236 |
10.32 |
| 2026-02-11 12:00 |
03:04:24.63 |
+14:31:55.4 |
HIP 14236 |
12.95 |
| 2026-02-12 00:00 |
03:04:35.18 |
+14:32:42.5 |
HIP 14236 |
15.62 |
| 2026-02-12 12:00 |
03:04:45.91 |
+14:33:30.2 |
HIP 14236 |
18.33 |
| 2026-02-13 00:00 |
03:04:56.82 |
+14:34:18.7 |
HIP 14236 |
21.09 |
| 2026-02-13 12:00 |
03:05:07.90 |
+14:35:07.8 |
HIP 14404 |
21.37 |
| 2026-02-14 00:00 |
03:05:19.15 |
+14:35:57.5 |
HIP 14404 |
21.07 |
| 2026-02-14 12:00 |
03:05:30.58 |
+14:36:48.0 |
HIP 14404 |
21.15 |
| 2026-02-15 00:00 |
03:05:42.18 |
+14:37:39.0 |
HIP 14404 |
21.63 |
| 2026-02-15 12:00 |
03:05:53.95 |
+14:38:30.7 |
HIP 14404 |
22.50 |
| 2026-02-16 00:00 |
03:06:05.89 |
+14:39:23.1 |
HIP 14404 |
23.73 |
| 2026-02-16 12:00 |
03:06:18.00 |
+14:40:16.0 |
HIP 14404 |
25.29 |
| 2026-02-17 00:00 |
03:06:30.28 |
+14:41:09.6 |
HIP 14404 |
27.13 |
| 2026-02-17 12:00 |
03:06:42.73 |
+14:42:03.8 |
HIP 14404 |
29.21 |
| 2026-02-18 00:00 |
03:06:55.34 |
+14:42:58.6 |
HIP 14497 |
29.67 |
| 2026-02-18 12:00 |
03:07:08.12 |
+14:43:54.0 |
HIP 14497 |
28.37 |
| 2026-02-19 00:00 |
03:07:21.07 |
+14:44:49.9 |
HIP 14497 |
27.38 |
| 2026-02-19 12:00 |
03:07:34.18 |
+14:45:46.5 |
HIP 14497 |
26.74 |
| 2026-02-20 00:00 |
03:07:47.45 |
+14:46:43.6 |
HIP 14497 |
26.51 |
| 2026-02-20 12:00 |
03:08:00.88 |
+14:47:41.3 |
HIP 14497 |
26.71 |
| 2026-02-21 00:00 |
03:08:14.48 |
+14:48:39.6 |
HIP 14497 |
27.34 |
| 2026-02-21 12:00 |
03:08:28.23 |
+14:49:38.4 |
HIP 14497 |
28.39 |
| 2026-02-22 00:00 |
03:08:42.14 |
+14:50:37.7 |
HIP 14614 |
29.49 |
| 2026-02-22 12:00 |
03:08:56.22 |
+14:51:37.6 |
HIP 14614 |
28.64 |
| 2026-02-23 00:00 |
03:09:10.44 |
+14:52:38.0 |
HIP 14614 |
28.20 |
| 2026-02-23 12:00 |
03:09:24.82 |
+14:53:38.9 |
HIP 14614 |
28.22 |
| 2026-02-24 00:00 |
03:09:39.36 |
+14:54:40.3 |
HIP 14705 |
28.19 |