| Parameter |
Value |
| Designation |
137P/Shoemaker-Levy 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-14T02:11:32.899200Z |
| Orbit solution date (soln_date, UTC) |
2026-05-22T14:12:30Z |
| Obs used |
1227 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-12-12.0000000 |
| e |
0.57205288 |
| q (au) |
1.933369 |
| a (au) |
4.517776 |
| i (deg) |
4.850346 |
| Ω (om, deg) |
233.073410 |
| ω (w, deg) |
140.987961 |
| M (ma, deg) |
247.291797 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:08:18.53 |
-17:34:42.3 |
HIP 74172 |
30.01 |
| 2026-06-01 12:00 |
15:08:02.30 |
-17:33:26.0 |
HIP 74172 |
33.12 |
| 2026-06-02 00:00 |
15:07:46.16 |
-17:32:10.0 |
HIP 73928 |
34.01 |
| 2026-06-02 12:00 |
15:07:30.12 |
-17:30:54.2 |
HIP 73928 |
30.95 |
| 2026-06-03 00:00 |
15:07:14.16 |
-17:29:38.7 |
HIP 73928 |
28.14 |
| 2026-06-03 12:00 |
15:06:58.31 |
-17:28:23.6 |
HIP 73928 |
25.66 |
| 2026-06-04 00:00 |
15:06:42.55 |
-17:27:08.7 |
HIP 73928 |
23.61 |
| 2026-06-04 12:00 |
15:06:26.89 |
-17:25:54.2 |
HIP 73928 |
22.09 |
| 2026-06-05 00:00 |
15:06:11.34 |
-17:24:40.0 |
HIP 73928 |
21.21 |
| 2026-06-05 12:00 |
15:05:55.89 |
-17:23:26.2 |
HIP 73928 |
21.02 |
| 2026-06-06 00:00 |
15:05:40.55 |
-17:22:12.7 |
HIP 73928 |
21.54 |
| 2026-06-06 12:00 |
15:05:25.32 |
-17:20:59.6 |
HIP 73928 |
22.70 |
| 2026-06-07 00:00 |
15:05:10.20 |
-17:19:46.9 |
HIP 73928 |
24.40 |
| 2026-06-07 12:00 |
15:04:55.20 |
-17:18:34.5 |
HIP 73928 |
26.53 |
| 2026-06-08 00:00 |
15:04:40.31 |
-17:17:22.6 |
HIP 73649 |
27.01 |
| 2026-06-08 12:00 |
15:04:25.53 |
-17:16:11.1 |
HIP 73649 |
25.44 |
| 2026-06-09 00:00 |
15:04:10.88 |
-17:15:00.0 |
HIP 73649 |
24.36 |
| 2026-06-09 12:00 |
15:03:56.35 |
-17:13:49.4 |
HIP 73649 |
23.80 |
| 2026-06-10 00:00 |
15:03:41.95 |
-17:12:39.2 |
HIP 73649 |
23.81 |
| 2026-06-10 12:00 |
15:03:27.67 |
-17:11:29.5 |
HIP 73649 |
24.35 |
| 2026-06-11 00:00 |
15:03:13.51 |
-17:10:20.2 |
HIP 73649 |
25.39 |
| 2026-06-11 12:00 |
15:02:59.49 |
-17:09:11.4 |
HIP 73649 |
26.86 |
| 2026-06-12 00:00 |
15:02:45.60 |
-17:08:03.1 |
HIP 73649 |
28.67 |
| 2026-06-12 12:00 |
15:02:31.85 |
-17:06:55.3 |
HIP 73649 |
30.75 |
| 2026-06-13 00:00 |
15:02:18.23 |
-17:05:48.1 |
HIP 73649 |
33.05 |
| 2026-06-13 12:00 |
15:02:04.74 |
-17:04:41.3 |
HIP 73649 |
35.51 |
| 2026-06-14 00:00 |
15:01:51.40 |
-17:03:35.1 |
HIP 73670 |
37.23 |
| 2026-06-14 12:00 |
15:01:38.20 |
-17:02:29.4 |
HIP 73428 |
35.39 |
| 2026-06-15 00:00 |
15:01:25.14 |
-17:01:24.3 |
HIP 73428 |
32.88 |
| 2026-06-15 12:00 |
15:01:12.23 |
-17:00:19.7 |
HIP 73428 |
30.55 |
| 2026-06-16 00:00 |
15:00:59.46 |
-16:59:15.8 |
HIP 73428 |
28.42 |
| 2026-06-16 12:00 |
15:00:46.84 |
-16:58:12.4 |
HIP 73428 |
26.54 |
| 2026-06-17 00:00 |
15:00:34.38 |
-16:57:09.6 |
HIP 73428 |
24.94 |
| 2026-06-17 12:00 |
15:00:22.06 |
-16:56:07.4 |
HIP 73428 |
23.67 |
| 2026-06-18 00:00 |
15:00:09.90 |
-16:55:05.8 |
HIP 73428 |
22.77 |
| 2026-06-18 12:00 |
14:59:57.89 |
-16:54:04.8 |
HIP 73428 |
22.26 |
| 2026-06-19 00:00 |
14:59:46.04 |
-16:53:04.5 |
HIP 73428 |
22.16 |
| 2026-06-19 12:00 |
14:59:34.35 |
-16:52:04.7 |
HIP 73428 |
22.46 |
| 2026-06-20 00:00 |
14:59:22.82 |
-16:51:05.7 |
HIP 73428 |
23.12 |
| 2026-06-20 12:00 |
14:59:11.44 |
-16:50:07.3 |
HIP 73428 |
24.11 |
| 2026-06-21 00:00 |
14:59:00.23 |
-16:49:09.5 |
HIP 73428 |
25.37 |
| 2026-06-21 12:00 |
14:58:49.18 |
-16:48:12.4 |
HIP 73191 |
24.90 |
| 2026-06-22 00:00 |
14:58:38.30 |
-16:47:16.0 |
HIP 73191 |
22.37 |