| Parameter |
Value |
| Designation |
C/1994 E2 (Shoemaker-Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-05-27T11:01:08.918400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-04-25.0000000 |
| e |
0.99730528 |
| q (au) |
1.158819 |
| a (au) |
430.033553 |
| i (deg) |
131.254567 |
| Ω (om, deg) |
166.568608 |
| ω (w, deg) |
57.496463 |
| M (ma, deg) |
359.996413 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.233 + 5.007\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.233 |
| n |
5.007 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.994 |
| 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) |
| 2026-06-01 00:00 |
22:08:37.01 |
-43:43:35.8 |
HIP 109288 |
19.95 |
| 2026-06-01 12:00 |
22:08:36.49 |
-43:43:55.2 |
HIP 109288 |
19.62 |
| 2026-06-02 00:00 |
22:08:35.94 |
-43:44:14.7 |
HIP 109288 |
19.29 |
| 2026-06-02 12:00 |
22:08:35.37 |
-43:44:34.3 |
HIP 109288 |
18.95 |
| 2026-06-03 00:00 |
22:08:34.78 |
-43:44:54.0 |
HIP 109288 |
18.62 |
| 2026-06-03 12:00 |
22:08:34.17 |
-43:45:13.6 |
HIP 109288 |
18.28 |
| 2026-06-04 00:00 |
22:08:33.53 |
-43:45:33.4 |
HIP 109288 |
17.94 |
| 2026-06-04 12:00 |
22:08:32.87 |
-43:45:53.2 |
HIP 109288 |
17.60 |
| 2026-06-05 00:00 |
22:08:32.19 |
-43:46:13.0 |
HIP 109288 |
17.26 |
| 2026-06-05 12:00 |
22:08:31.48 |
-43:46:32.9 |
HIP 109288 |
16.92 |
| 2026-06-06 00:00 |
22:08:30.75 |
-43:46:52.8 |
HIP 109288 |
16.59 |
| 2026-06-06 12:00 |
22:08:30.00 |
-43:47:12.8 |
HIP 109288 |
16.25 |
| 2026-06-07 00:00 |
22:08:29.22 |
-43:47:32.8 |
HIP 109288 |
15.91 |
| 2026-06-07 12:00 |
22:08:28.42 |
-43:47:52.9 |
HIP 109288 |
15.57 |
| 2026-06-08 00:00 |
22:08:27.60 |
-43:48:13.0 |
HIP 109288 |
15.23 |
| 2026-06-08 12:00 |
22:08:26.75 |
-43:48:33.1 |
HIP 109288 |
14.89 |
| 2026-06-09 00:00 |
22:08:25.88 |
-43:48:53.3 |
HIP 109288 |
14.55 |
| 2026-06-09 12:00 |
22:08:24.99 |
-43:49:13.5 |
HIP 109288 |
14.21 |
| 2026-06-10 00:00 |
22:08:24.08 |
-43:49:33.8 |
HIP 109288 |
13.88 |
| 2026-06-10 12:00 |
22:08:23.14 |
-43:49:54.1 |
HIP 109288 |
13.54 |
| 2026-06-11 00:00 |
22:08:22.18 |
-43:50:14.4 |
HIP 109288 |
13.21 |
| 2026-06-11 12:00 |
22:08:21.20 |
-43:50:34.7 |
HIP 109288 |
12.88 |
| 2026-06-12 00:00 |
22:08:20.19 |
-43:50:55.1 |
HIP 109288 |
12.55 |
| 2026-06-12 12:00 |
22:08:19.16 |
-43:51:15.5 |
HIP 109288 |
12.23 |
| 2026-06-13 00:00 |
22:08:18.11 |
-43:51:36.0 |
HIP 109288 |
11.91 |
| 2026-06-13 12:00 |
22:08:17.04 |
-43:51:56.4 |
HIP 109288 |
11.59 |
| 2026-06-14 00:00 |
22:08:15.95 |
-43:52:16.9 |
HIP 109288 |
11.28 |
| 2026-06-14 12:00 |
22:08:14.83 |
-43:52:37.4 |
HIP 109288 |
10.98 |
| 2026-06-15 00:00 |
22:08:13.69 |
-43:52:57.9 |
HIP 109288 |
10.68 |
| 2026-06-15 12:00 |
22:08:12.53 |
-43:53:18.5 |
HIP 109288 |
10.39 |
| 2026-06-16 00:00 |
22:08:11.34 |
-43:53:39.0 |
HIP 109288 |
10.10 |
| 2026-06-16 12:00 |
22:08:10.13 |
-43:53:59.6 |
HIP 109288 |
9.83 |
| 2026-06-17 00:00 |
22:08:08.91 |
-43:54:20.2 |
HIP 109288 |
9.57 |
| 2026-06-17 12:00 |
22:08:07.65 |
-43:54:40.8 |
HIP 109288 |
9.32 |
| 2026-06-18 00:00 |
22:08:06.38 |
-43:55:01.4 |
HIP 109288 |
9.08 |
| 2026-06-18 12:00 |
22:08:05.09 |
-43:55:22.0 |
HIP 109288 |
8.85 |
| 2026-06-19 00:00 |
22:08:03.77 |
-43:55:42.7 |
HIP 109288 |
8.64 |
| 2026-06-19 12:00 |
22:08:02.43 |
-43:56:03.3 |
HIP 109288 |
8.45 |
| 2026-06-20 00:00 |
22:08:01.08 |
-43:56:23.9 |
HIP 109288 |
8.28 |
| 2026-06-20 12:00 |
22:07:59.70 |
-43:56:44.6 |
HIP 109288 |
8.13 |
| 2026-06-21 00:00 |
22:07:58.30 |
-43:57:05.2 |
HIP 109288 |
8.00 |
| 2026-06-21 12:00 |
22:07:56.87 |
-43:57:25.8 |
HIP 109288 |
7.89 |
| 2026-06-22 00:00 |
22:07:55.43 |
-43:57:46.5 |
HIP 109288 |
7.81 |