| 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) |
| 2026-05-12 00:00 |
22:08:38.54 |
-43:31:38.1 |
HIP 109300 |
29.16 |
| 2026-05-12 12:00 |
22:08:38.96 |
-43:31:54.3 |
HIP 109300 |
29.43 |
| 2026-05-13 00:00 |
22:08:39.36 |
-43:32:10.5 |
HIP 109300 |
29.70 |
| 2026-05-13 12:00 |
22:08:39.73 |
-43:32:26.9 |
HIP 109300 |
29.98 |
| 2026-05-14 00:00 |
22:08:40.08 |
-43:32:43.3 |
HIP 109300 |
30.25 |
| 2026-05-14 12:00 |
22:08:40.41 |
-43:33:00.0 |
HIP 109300 |
30.53 |
| 2026-05-15 00:00 |
22:08:40.71 |
-43:33:16.6 |
HIP 109288 |
30.29 |
| 2026-05-15 12:00 |
22:08:41.00 |
-43:33:33.4 |
HIP 109288 |
30.01 |
| 2026-05-16 00:00 |
22:08:41.25 |
-43:33:50.3 |
HIP 109288 |
29.74 |
| 2026-05-16 12:00 |
22:08:41.49 |
-43:34:07.2 |
HIP 109288 |
29.46 |
| 2026-05-17 00:00 |
22:08:41.70 |
-43:34:24.3 |
HIP 109288 |
29.18 |
| 2026-05-17 12:00 |
22:08:41.88 |
-43:34:41.5 |
HIP 109288 |
28.90 |
| 2026-05-18 00:00 |
22:08:42.05 |
-43:34:58.8 |
HIP 109288 |
28.62 |
| 2026-05-18 12:00 |
22:08:42.19 |
-43:35:16.1 |
HIP 109288 |
28.33 |
| 2026-05-19 00:00 |
22:08:42.30 |
-43:35:33.6 |
HIP 109288 |
28.04 |
| 2026-05-19 12:00 |
22:08:42.39 |
-43:35:51.1 |
HIP 109288 |
27.76 |
| 2026-05-20 00:00 |
22:08:42.46 |
-43:36:08.8 |
HIP 109288 |
27.47 |
| 2026-05-20 12:00 |
22:08:42.51 |
-43:36:26.5 |
HIP 109288 |
27.17 |
| 2026-05-21 00:00 |
22:08:42.53 |
-43:36:44.3 |
HIP 109288 |
26.88 |
| 2026-05-21 12:00 |
22:08:42.52 |
-43:37:02.2 |
HIP 109288 |
26.58 |
| 2026-05-22 00:00 |
22:08:42.50 |
-43:37:20.2 |
HIP 109288 |
26.28 |
| 2026-05-22 12:00 |
22:08:42.45 |
-43:37:38.3 |
HIP 109288 |
25.98 |
| 2026-05-23 00:00 |
22:08:42.37 |
-43:37:56.4 |
HIP 109288 |
25.68 |
| 2026-05-23 12:00 |
22:08:42.28 |
-43:38:14.7 |
HIP 109288 |
25.38 |
| 2026-05-24 00:00 |
22:08:42.15 |
-43:38:33.0 |
HIP 109288 |
25.07 |
| 2026-05-24 12:00 |
22:08:42.01 |
-43:38:51.4 |
HIP 109288 |
24.76 |
| 2026-05-25 00:00 |
22:08:41.84 |
-43:39:09.8 |
HIP 109288 |
24.45 |
| 2026-05-25 12:00 |
22:08:41.65 |
-43:39:28.4 |
HIP 109288 |
24.14 |
| 2026-05-26 00:00 |
22:08:41.43 |
-43:39:47.0 |
HIP 109288 |
23.83 |
| 2026-05-26 12:00 |
22:08:41.19 |
-43:40:05.7 |
HIP 109288 |
23.52 |
| 2026-05-27 00:00 |
22:08:40.93 |
-43:40:24.5 |
HIP 109288 |
23.20 |
| 2026-05-27 12:00 |
22:08:40.64 |
-43:40:43.3 |
HIP 109288 |
22.88 |
| 2026-05-28 00:00 |
22:08:40.33 |
-43:41:02.2 |
HIP 109288 |
22.56 |
| 2026-05-28 12:00 |
22:08:40.00 |
-43:41:21.2 |
HIP 109288 |
22.24 |
| 2026-05-29 00:00 |
22:08:39.64 |
-43:41:40.2 |
HIP 109288 |
21.92 |
| 2026-05-29 12:00 |
22:08:39.26 |
-43:41:59.3 |
HIP 109288 |
21.60 |
| 2026-05-30 00:00 |
22:08:38.86 |
-43:42:18.5 |
HIP 109288 |
21.27 |
| 2026-05-30 12:00 |
22:08:38.43 |
-43:42:37.7 |
HIP 109288 |
20.94 |
| 2026-05-31 00:00 |
22:08:37.98 |
-43:42:57.0 |
HIP 109288 |
20.61 |
| 2026-05-31 12:00 |
22:08:37.50 |
-43:43:16.3 |
HIP 109288 |
20.28 |
| 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 |