| 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
$$
M_a = (14.084 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.084 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.995 |
| 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 |
04:27:30.01 |
+18:50:13.2 |
HIP 20769 |
18.24 |
| 2026-06-01 12:00 |
04:27:58.83 |
+18:51:07.3 |
HIP 20769 |
21.08 |
| 2026-06-02 00:00 |
04:28:27.64 |
+18:52:01.1 |
HIP 20889 |
18.94 |
| 2026-06-02 12:00 |
04:28:56.46 |
+18:52:54.5 |
HIP 20889 |
18.51 |
| 2026-06-03 00:00 |
04:29:25.29 |
+18:53:47.4 |
HIP 20889 |
20.52 |
| 2026-06-03 12:00 |
04:29:54.12 |
+18:54:40.0 |
HIP 21089 |
18.86 |
| 2026-06-04 00:00 |
04:30:22.95 |
+18:55:32.1 |
HIP 21089 |
12.89 |
| 2026-06-04 12:00 |
04:30:51.78 |
+18:56:23.8 |
HIP 21089 |
8.43 |
| 2026-06-05 00:00 |
04:31:20.62 |
+18:57:15.1 |
HIP 21089 |
8.39 |
| 2026-06-05 12:00 |
04:31:49.45 |
+18:58:06.0 |
HIP 21089 |
12.81 |
| 2026-06-06 00:00 |
04:32:18.29 |
+18:58:56.5 |
HIP 21089 |
18.77 |
| 2026-06-06 12:00 |
04:32:47.12 |
+18:59:46.6 |
HIP 21261 |
12.98 |
| 2026-06-07 00:00 |
04:33:15.96 |
+19:00:36.2 |
HIP 21261 |
6.13 |
| 2026-06-07 12:00 |
04:33:44.79 |
+19:01:25.4 |
HIP 21261 |
0.90 |
| 2026-06-08 00:00 |
04:34:13.62 |
+19:02:14.2 |
HIP 21261 |
7.63 |
| 2026-06-08 12:00 |
04:34:42.45 |
+19:03:02.5 |
HIP 21261 |
14.49 |
| 2026-06-09 00:00 |
04:35:11.27 |
+19:03:50.5 |
HIP 21261 |
21.34 |
| 2026-06-09 12:00 |
04:35:40.09 |
+19:04:38.0 |
HIP 21467 |
23.65 |
| 2026-06-10 00:00 |
04:36:08.91 |
+19:05:25.0 |
HIP 21467 |
21.24 |
| 2026-06-10 12:00 |
04:36:37.72 |
+19:06:11.6 |
HIP 21467 |
20.90 |
| 2026-06-11 00:00 |
04:37:06.52 |
+19:06:57.8 |
HIP 21467 |
22.71 |
| 2026-06-11 12:00 |
04:37:35.32 |
+19:07:43.6 |
HIP 21687 |
25.37 |
| 2026-06-12 00:00 |
04:38:04.11 |
+19:08:28.9 |
HIP 21687 |
18.61 |
| 2026-06-12 12:00 |
04:38:32.89 |
+19:09:13.8 |
HIP 21687 |
11.95 |
| 2026-06-13 00:00 |
04:39:01.66 |
+19:09:58.2 |
HIP 21687 |
5.73 |
| 2026-06-13 12:00 |
04:39:30.43 |
+19:10:42.2 |
HIP 21687 |
4.02 |
| 2026-06-14 00:00 |
04:39:59.18 |
+19:11:25.7 |
HIP 21687 |
9.63 |
| 2026-06-14 12:00 |
04:40:27.92 |
+19:12:08.8 |
HIP 21687 |
16.20 |
| 2026-06-15 00:00 |
04:40:56.65 |
+19:12:51.5 |
HIP 21687 |
22.92 |
| 2026-06-15 12:00 |
04:41:25.36 |
+19:13:33.6 |
HIP 21831 |
22.12 |
| 2026-06-16 00:00 |
04:41:54.06 |
+19:14:15.4 |
HIP 21831 |
21.74 |
| 2026-06-16 12:00 |
04:42:22.75 |
+19:14:56.7 |
HIP 21932 |
18.93 |
| 2026-06-17 00:00 |
04:42:51.42 |
+19:15:37.5 |
HIP 21932 |
18.00 |
| 2026-06-17 12:00 |
04:43:20.07 |
+19:16:17.9 |
HIP 21932 |
19.54 |
| 2026-06-18 00:00 |
04:43:48.71 |
+19:16:57.8 |
HIP 21932 |
23.06 |
| 2026-06-18 12:00 |
04:44:17.33 |
+19:17:37.3 |
HIP 22105 |
16.94 |
| 2026-06-19 00:00 |
04:44:45.93 |
+19:18:16.3 |
HIP 22105 |
10.22 |
| 2026-06-19 12:00 |
04:45:14.51 |
+19:18:54.8 |
HIP 22105 |
3.73 |
| 2026-06-20 00:00 |
04:45:43.07 |
+19:19:32.9 |
HIP 22112 |
1.98 |
| 2026-06-20 12:00 |
04:46:11.61 |
+19:20:10.5 |
HIP 22185 |
8.26 |
| 2026-06-21 00:00 |
04:46:40.13 |
+19:20:47.7 |
HIP 22211 |
8.92 |
| 2026-06-21 12:00 |
04:47:08.63 |
+19:21:24.4 |
HIP 22211 |
11.30 |
| 2026-06-22 00:00 |
04:47:37.11 |
+19:22:00.6 |
HIP 22211 |
16.33 |