| 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) |
| 2026-03-26 00:00 |
22:06:25.48 |
-43:16:17.8 |
HIP 109138 |
17.87 |
| 2026-03-26 12:00 |
22:06:27.72 |
-43:16:20.5 |
HIP 109138 |
17.92 |
| 2026-03-27 00:00 |
22:06:29.95 |
-43:16:23.3 |
HIP 109138 |
17.98 |
| 2026-03-27 12:00 |
22:06:32.16 |
-43:16:26.3 |
HIP 109138 |
18.06 |
| 2026-03-28 00:00 |
22:06:34.36 |
-43:16:29.5 |
HIP 109138 |
18.14 |
| 2026-03-28 12:00 |
22:06:36.54 |
-43:16:32.8 |
HIP 109138 |
18.24 |
| 2026-03-29 00:00 |
22:06:38.71 |
-43:16:36.3 |
HIP 109138 |
18.35 |
| 2026-03-29 12:00 |
22:06:40.86 |
-43:16:39.9 |
HIP 109138 |
18.47 |
| 2026-03-30 00:00 |
22:06:43.00 |
-43:16:43.7 |
HIP 109138 |
18.59 |
| 2026-03-30 12:00 |
22:06:45.13 |
-43:16:47.7 |
HIP 109138 |
18.73 |
| 2026-03-31 00:00 |
22:06:47.23 |
-43:16:51.8 |
HIP 109138 |
18.88 |
| 2026-03-31 12:00 |
22:06:49.33 |
-43:16:56.1 |
HIP 109138 |
19.03 |
| 2026-04-01 00:00 |
22:06:51.41 |
-43:17:00.6 |
HIP 109138 |
19.20 |
| 2026-04-01 12:00 |
22:06:53.47 |
-43:17:05.2 |
HIP 109138 |
19.37 |
| 2026-04-02 00:00 |
22:06:55.52 |
-43:17:10.0 |
HIP 109138 |
19.55 |
| 2026-04-02 12:00 |
22:06:57.55 |
-43:17:14.9 |
HIP 109138 |
19.74 |
| 2026-04-03 00:00 |
22:06:59.57 |
-43:17:20.1 |
HIP 109138 |
19.93 |
| 2026-04-03 12:00 |
22:07:01.57 |
-43:17:25.3 |
HIP 109138 |
20.13 |
| 2026-04-04 00:00 |
22:07:03.56 |
-43:17:30.7 |
HIP 109138 |
20.34 |
| 2026-04-04 12:00 |
22:07:05.53 |
-43:17:36.3 |
HIP 109138 |
20.55 |
| 2026-04-05 00:00 |
22:07:07.48 |
-43:17:42.1 |
HIP 109138 |
20.77 |
| 2026-04-05 12:00 |
22:07:09.42 |
-43:17:48.0 |
HIP 109138 |
21.00 |
| 2026-04-06 00:00 |
22:07:11.34 |
-43:17:54.1 |
HIP 109138 |
21.23 |
| 2026-04-06 12:00 |
22:07:13.24 |
-43:18:00.3 |
HIP 109138 |
21.46 |
| 2026-04-07 00:00 |
22:07:15.13 |
-43:18:06.7 |
HIP 109138 |
21.70 |
| 2026-04-07 12:00 |
22:07:17.00 |
-43:18:13.2 |
HIP 109300 |
21.76 |
| 2026-04-08 00:00 |
22:07:18.85 |
-43:18:19.9 |
HIP 109300 |
21.61 |
| 2026-04-08 12:00 |
22:07:20.69 |
-43:18:26.8 |
HIP 109300 |
21.47 |
| 2026-04-09 00:00 |
22:07:22.51 |
-43:18:33.8 |
HIP 109300 |
21.33 |
| 2026-04-09 12:00 |
22:07:24.31 |
-43:18:41.0 |
HIP 109300 |
21.21 |
| 2026-04-10 00:00 |
22:07:26.09 |
-43:18:48.3 |
HIP 109300 |
21.10 |
| 2026-04-10 12:00 |
22:07:27.86 |
-43:18:55.8 |
HIP 109300 |
20.99 |
| 2026-04-11 00:00 |
22:07:29.61 |
-43:19:03.5 |
HIP 109300 |
20.90 |
| 2026-04-11 12:00 |
22:07:31.34 |
-43:19:11.3 |
HIP 109300 |
20.81 |
| 2026-04-12 00:00 |
22:07:33.05 |
-43:19:19.3 |
HIP 109300 |
20.73 |
| 2026-04-12 12:00 |
22:07:34.74 |
-43:19:27.4 |
HIP 109300 |
20.67 |
| 2026-04-13 00:00 |
22:07:36.42 |
-43:19:35.7 |
HIP 109300 |
20.61 |
| 2026-04-13 12:00 |
22:07:38.07 |
-43:19:44.1 |
HIP 109300 |
20.56 |
| 2026-04-14 00:00 |
22:07:39.71 |
-43:19:52.7 |
HIP 109300 |
20.52 |
| 2026-04-14 12:00 |
22:07:41.33 |
-43:20:01.4 |
HIP 109300 |
20.49 |
| 2026-04-15 00:00 |
22:07:42.93 |
-43:20:10.3 |
HIP 109300 |
20.47 |
| 2026-04-15 12:00 |
22:07:44.51 |
-43:20:19.4 |
HIP 109300 |
20.46 |
| 2026-04-16 00:00 |
22:07:46.07 |
-43:20:28.6 |
HIP 109300 |
20.45 |