137P/Shoemaker-Levy 2
| Parameter |
Value |
| Designation |
137P/Shoemaker-Levy 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-14T02:22:31.828800Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:05Z |
| Obs used |
1224 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-12-03.0000000 |
| e |
0.57205656 |
| q (au) |
1.933328 |
| a (au) |
4.517719 |
| i (deg) |
4.850374 |
| Ω (om, deg) |
233.073318 |
| ω (w, deg) |
140.989437 |
| M (ma, deg) |
246.365120 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.557 + 2.151\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.557 |
| n |
2.151 |
| gf |
0.800 |
| gb |
-0.701 |
| k |
0.941 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:35:56.71 |
-19:49:58.4 |
HIP 76336 |
13.50 |
| 2026-02-03 12:00 |
15:36:07.97 |
-19:50:31.4 |
HIP 76336 |
15.28 |
| 2026-02-04 00:00 |
15:36:19.09 |
-19:51:03.9 |
HIP 76336 |
17.27 |
| 2026-02-04 12:00 |
15:36:30.07 |
-19:51:35.9 |
HIP 76336 |
19.39 |
| 2026-02-05 00:00 |
15:36:40.91 |
-19:52:07.3 |
HIP 76336 |
21.60 |
| 2026-02-05 12:00 |
15:36:51.62 |
-19:52:38.2 |
HIP 76582 |
22.17 |
| 2026-02-06 00:00 |
15:37:02.18 |
-19:53:08.6 |
HIP 76582 |
19.65 |
| 2026-02-06 12:00 |
15:37:12.60 |
-19:53:38.5 |
HIP 76582 |
17.17 |
| 2026-02-07 00:00 |
15:37:22.87 |
-19:54:07.8 |
HIP 76582 |
14.73 |
| 2026-02-07 12:00 |
15:37:33.00 |
-19:54:36.5 |
HIP 76582 |
12.34 |
| 2026-02-08 00:00 |
15:37:42.98 |
-19:55:04.7 |
HIP 76582 |
9.99 |
| 2026-02-08 12:00 |
15:37:52.82 |
-19:55:32.4 |
HIP 76582 |
7.71 |
| 2026-02-09 00:00 |
15:38:02.51 |
-19:55:59.6 |
HIP 76582 |
5.53 |
| 2026-02-09 12:00 |
15:38:12.05 |
-19:56:26.1 |
HIP 76582 |
3.57 |
| 2026-02-10 00:00 |
15:38:21.44 |
-19:56:52.2 |
HIP 76582 |
2.30 |
| 2026-02-10 12:00 |
15:38:30.68 |
-19:57:17.6 |
HIP 76582 |
2.80 |
| 2026-02-11 00:00 |
15:38:39.77 |
-19:57:42.6 |
HIP 76582 |
4.46 |
| 2026-02-11 12:00 |
15:38:48.70 |
-19:58:06.9 |
HIP 76582 |
6.40 |
| 2026-02-12 00:00 |
15:38:57.49 |
-19:58:30.7 |
HIP 76582 |
8.40 |
| 2026-02-12 12:00 |
15:39:06.11 |
-19:58:54.0 |
HIP 76582 |
10.40 |
| 2026-02-13 00:00 |
15:39:14.58 |
-19:59:16.7 |
HIP 76582 |
12.39 |
| 2026-02-13 12:00 |
15:39:22.90 |
-19:59:38.8 |
HIP 76582 |
14.35 |
| 2026-02-14 00:00 |
15:39:31.06 |
-20:00:00.3 |
HIP 76714 |
14.91 |
| 2026-02-14 12:00 |
15:39:39.06 |
-20:00:21.3 |
HIP 76714 |
14.67 |
| 2026-02-15 00:00 |
15:39:46.90 |
-20:00:41.7 |
HIP 76714 |
14.66 |
| 2026-02-15 12:00 |
15:39:54.58 |
-20:01:01.5 |
HIP 76714 |
14.88 |
| 2026-02-16 00:00 |
15:40:02.09 |
-20:01:20.8 |
HIP 76714 |
15.31 |
| 2026-02-16 12:00 |
15:40:09.45 |
-20:01:39.5 |
HIP 76714 |
15.91 |
| 2026-02-17 00:00 |
15:40:16.64 |
-20:01:57.6 |
HIP 76714 |
16.65 |
| 2026-02-17 12:00 |
15:40:23.67 |
-20:02:15.1 |
HIP 76714 |
17.51 |
| 2026-02-18 00:00 |
15:40:30.53 |
-20:02:32.1 |
HIP 76714 |
18.45 |
| 2026-02-18 12:00 |
15:40:37.23 |
-20:02:48.5 |
HIP 76714 |
19.46 |
| 2026-02-19 00:00 |
15:40:43.77 |
-20:03:04.2 |
HIP 76714 |
20.51 |
| 2026-02-19 12:00 |
15:40:50.13 |
-20:03:19.4 |
HIP 76714 |
21.59 |
| 2026-02-20 00:00 |
15:40:56.33 |
-20:03:34.0 |
HIP 76714 |
22.69 |
| 2026-02-20 12:00 |
15:41:02.36 |
-20:03:48.1 |
HIP 76714 |
23.80 |
| 2026-02-21 00:00 |
15:41:08.22 |
-20:04:01.5 |
HIP 76714 |
24.90 |
| 2026-02-21 12:00 |
15:41:13.91 |
-20:04:14.3 |
HIP 76880 |
25.60 |
| 2026-02-22 00:00 |
15:41:19.43 |
-20:04:26.6 |
HIP 76880 |
25.31 |
| 2026-02-22 12:00 |
15:41:24.77 |
-20:04:38.3 |
HIP 76880 |
25.08 |
| 2026-02-23 00:00 |
15:41:29.95 |
-20:04:49.3 |
HIP 76880 |
24.92 |
| 2026-02-23 12:00 |
15:41:34.95 |
-20:04:59.8 |
HIP 76880 |
24.82 |
| 2026-02-24 00:00 |
15:41:39.78 |
-20:05:09.7 |
HIP 76880 |
24.77 |