| 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) |
| 2026-07-29 00:00 |
05:20:53.71 |
+19:45:01.3 |
HIP 24977 |
3.90 |
| 2026-07-29 12:00 |
05:21:18.47 |
+19:45:02.6 |
HIP 24977 |
6.40 |
| 2026-07-30 00:00 |
05:21:43.15 |
+19:45:03.4 |
HIP 25086 |
8.92 |
| 2026-07-30 12:00 |
05:22:07.75 |
+19:45:03.7 |
HIP 25086 |
5.24 |
| 2026-07-31 00:00 |
05:22:32.27 |
+19:45:03.6 |
HIP 25086 |
6.50 |
| 2026-07-31 12:00 |
05:22:56.71 |
+19:45:03.1 |
HIP 25086 |
11.10 |
| 2026-08-01 00:00 |
05:23:21.06 |
+19:45:02.1 |
HIP 25086 |
16.43 |
| 2026-08-01 12:00 |
05:23:45.34 |
+19:45:00.7 |
HIP 25250 |
15.20 |
| 2026-08-02 00:00 |
05:24:09.52 |
+19:44:58.9 |
HIP 25250 |
15.26 |
| 2026-08-02 12:00 |
05:24:33.63 |
+19:44:56.6 |
HIP 25250 |
17.31 |
| 2026-08-03 00:00 |
05:24:57.64 |
+19:44:53.8 |
HIP 25250 |
20.73 |
| 2026-08-03 12:00 |
05:25:21.57 |
+19:44:50.7 |
HIP 25250 |
24.97 |
| 2026-08-04 00:00 |
05:25:45.42 |
+19:44:47.1 |
HIP 25510 |
26.34 |
| 2026-08-04 12:00 |
05:26:09.17 |
+19:44:43.0 |
HIP 25510 |
22.02 |
| 2026-08-05 00:00 |
05:26:32.84 |
+19:44:38.6 |
HIP 25510 |
18.42 |
| 2026-08-05 12:00 |
05:26:56.41 |
+19:44:33.7 |
HIP 25510 |
15.99 |
| 2026-08-06 00:00 |
05:27:19.89 |
+19:44:28.3 |
HIP 25510 |
15.30 |
| 2026-08-06 12:00 |
05:27:43.28 |
+19:44:22.6 |
HIP 25510 |
16.53 |
| 2026-08-07 00:00 |
05:28:06.58 |
+19:44:16.4 |
HIP 25510 |
19.30 |
| 2026-08-07 12:00 |
05:28:29.78 |
+19:44:09.8 |
HIP 25510 |
23.06 |
| 2026-08-08 00:00 |
05:28:52.89 |
+19:44:02.8 |
HIP 25726 |
21.61 |
| 2026-08-08 12:00 |
05:29:15.90 |
+19:43:55.3 |
HIP 25726 |
19.74 |
| 2026-08-09 00:00 |
05:29:38.81 |
+19:43:47.4 |
HIP 25834 |
18.52 |
| 2026-08-09 12:00 |
05:30:01.63 |
+19:43:39.1 |
HIP 25834 |
13.32 |
| 2026-08-10 00:00 |
05:30:24.34 |
+19:43:30.4 |
HIP 25834 |
8.38 |
| 2026-08-10 12:00 |
05:30:46.96 |
+19:43:21.2 |
HIP 25834 |
4.49 |
| 2026-08-11 00:00 |
05:31:09.47 |
+19:43:11.7 |
HIP 25834 |
5.17 |
| 2026-08-11 12:00 |
05:31:31.88 |
+19:43:01.7 |
HIP 25834 |
9.44 |
| 2026-08-12 00:00 |
05:31:54.18 |
+19:42:51.3 |
HIP 25908 |
9.96 |
| 2026-08-12 12:00 |
05:32:16.38 |
+19:42:40.6 |
HIP 25908 |
11.94 |
| 2026-08-13 00:00 |
05:32:38.47 |
+19:42:29.4 |
HIP 25908 |
15.49 |
| 2026-08-13 12:00 |
05:33:00.45 |
+19:42:17.8 |
HIP 25908 |
19.76 |
| 2026-08-14 00:00 |
05:33:22.33 |
+19:42:05.8 |
HIP 26018 |
20.40 |
| 2026-08-14 12:00 |
05:33:44.10 |
+19:41:53.4 |
HIP 26018 |
22.09 |
| 2026-08-15 00:00 |
05:34:05.75 |
+19:41:40.6 |
HIP 26229 |
17.59 |
| 2026-08-15 12:00 |
05:34:27.30 |
+19:41:27.4 |
HIP 26229 |
12.73 |
| 2026-08-16 00:00 |
05:34:48.73 |
+19:41:13.8 |
HIP 26229 |
8.15 |
| 2026-08-16 12:00 |
05:35:10.05 |
+19:40:59.8 |
HIP 26229 |
4.68 |
| 2026-08-17 00:00 |
05:35:31.25 |
+19:40:45.4 |
HIP 26229 |
5.28 |
| 2026-08-17 12:00 |
05:35:52.34 |
+19:40:30.7 |
HIP 26298 |
7.92 |
| 2026-08-18 00:00 |
05:36:13.31 |
+19:40:15.5 |
HIP 26298 |
7.72 |
| 2026-08-18 12:00 |
05:36:34.17 |
+19:40:00.0 |
HIP 26298 |
10.24 |
| 2026-08-19 00:00 |
05:36:54.90 |
+19:39:44.1 |
HIP 26438 |
11.66 |