| Parameter |
Value |
| Designation |
181P/Shoemaker-Levy 6 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-06-10T07:49:11.971200Z |
| Orbit solution date (soln_date, UTC) |
2014-08-29T13:06:38Z |
| Obs used |
88 |
| NEO |
Yes |
| M1 |
16.300 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-09-08.0000000 |
| e |
0.70732283 |
| q (au) |
1.123593 |
| a (au) |
3.839018 |
| i (deg) |
16.981179 |
| Ω (om, deg) |
37.679458 |
| ω (w, deg) |
333.798849 |
| M (ma, deg) |
11.750089 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.938 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.938 |
| n |
2.000 |
| gf |
0.900 |
| gb |
-0.500 |
| k |
0.861 |
| δ90 |
3.979 |
| 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) |
| 2026-07-29 00:00 |
12:53:15.78 |
-01:05:56.9 |
HIP 62808 |
18.89 |
| 2026-07-29 12:00 |
12:53:24.42 |
-01:07:28.1 |
HIP 62808 |
21.53 |
| 2026-07-30 00:00 |
12:53:33.17 |
-01:08:59.9 |
HIP 62963 |
21.20 |
| 2026-07-30 12:00 |
12:53:42.03 |
-01:10:32.2 |
HIP 62963 |
18.93 |
| 2026-07-31 00:00 |
12:53:50.99 |
-01:12:05.0 |
HIP 62963 |
16.78 |
| 2026-07-31 12:00 |
12:54:00.06 |
-01:13:38.3 |
HIP 62963 |
14.79 |
| 2026-08-01 00:00 |
12:54:09.23 |
-01:15:12.1 |
HIP 62963 |
13.08 |
| 2026-08-01 12:00 |
12:54:18.51 |
-01:16:46.5 |
HIP 62963 |
11.78 |
| 2026-08-02 00:00 |
12:54:27.89 |
-01:18:21.3 |
HIP 62963 |
11.05 |
| 2026-08-02 12:00 |
12:54:37.37 |
-01:19:56.7 |
HIP 62963 |
11.04 |
| 2026-08-03 00:00 |
12:54:46.95 |
-01:21:32.5 |
HIP 62963 |
11.75 |
| 2026-08-03 12:00 |
12:54:56.64 |
-01:23:08.8 |
HIP 62963 |
13.10 |
| 2026-08-04 00:00 |
12:55:06.42 |
-01:24:45.7 |
HIP 62963 |
14.91 |
| 2026-08-04 12:00 |
12:55:16.31 |
-01:26:23.0 |
HIP 62963 |
17.07 |
| 2026-08-05 00:00 |
12:55:26.30 |
-01:28:00.8 |
HIP 63098 |
15.59 |
| 2026-08-05 12:00 |
12:55:36.38 |
-01:29:39.0 |
HIP 63098 |
13.58 |
| 2026-08-06 00:00 |
12:55:46.57 |
-01:31:17.8 |
HIP 63098 |
11.99 |
| 2026-08-06 12:00 |
12:55:56.85 |
-01:32:57.0 |
HIP 63098 |
11.03 |
| 2026-08-07 00:00 |
12:56:07.24 |
-01:34:36.7 |
HIP 63098 |
10.88 |
| 2026-08-07 12:00 |
12:56:17.72 |
-01:36:16.8 |
HIP 63098 |
11.59 |
| 2026-08-08 00:00 |
12:56:28.29 |
-01:37:57.4 |
HIP 63098 |
13.04 |
| 2026-08-08 12:00 |
12:56:38.97 |
-01:39:38.4 |
HIP 63098 |
15.04 |
| 2026-08-09 00:00 |
12:56:49.74 |
-01:41:19.9 |
HIP 63098 |
17.40 |
| 2026-08-09 12:00 |
12:57:00.60 |
-01:43:01.9 |
HIP 63098 |
20.02 |
| 2026-08-10 00:00 |
12:57:11.56 |
-01:44:44.3 |
HIP 63269 |
21.29 |
| 2026-08-10 12:00 |
12:57:22.61 |
-01:46:27.1 |
HIP 63269 |
18.49 |
| 2026-08-11 00:00 |
12:57:33.76 |
-01:48:10.4 |
HIP 63269 |
15.84 |
| 2026-08-11 12:00 |
12:57:45.00 |
-01:49:54.0 |
HIP 63269 |
13.47 |
| 2026-08-12 00:00 |
12:57:56.33 |
-01:51:38.1 |
HIP 63269 |
11.55 |
| 2026-08-12 12:00 |
12:58:07.75 |
-01:53:22.7 |
HIP 63269 |
10.37 |
| 2026-08-13 00:00 |
12:58:19.26 |
-01:55:07.6 |
HIP 63269 |
10.21 |
| 2026-08-13 12:00 |
12:58:30.86 |
-01:56:52.9 |
HIP 63361 |
10.74 |
| 2026-08-14 00:00 |
12:58:42.56 |
-01:58:38.7 |
HIP 63361 |
7.54 |
| 2026-08-14 12:00 |
12:58:54.34 |
-02:00:24.8 |
HIP 63361 |
4.65 |
| 2026-08-15 00:00 |
12:59:06.21 |
-02:02:11.4 |
HIP 63361 |
3.18 |
| 2026-08-15 12:00 |
12:59:18.16 |
-02:03:58.3 |
HIP 63361 |
4.75 |
| 2026-08-16 00:00 |
12:59:30.21 |
-02:05:45.6 |
HIP 63361 |
7.72 |
| 2026-08-16 12:00 |
12:59:42.34 |
-02:07:33.3 |
HIP 63361 |
11.03 |
| 2026-08-17 00:00 |
12:59:54.55 |
-02:09:21.3 |
HIP 63361 |
14.46 |
| 2026-08-17 12:00 |
13:00:06.85 |
-02:11:09.8 |
HIP 63361 |
17.96 |
| 2026-08-18 00:00 |
13:00:19.23 |
-02:12:58.6 |
HIP 63496 |
21.36 |
| 2026-08-18 12:00 |
13:00:31.70 |
-02:14:47.7 |
HIP 63496 |
19.06 |
| 2026-08-19 00:00 |
13:00:44.25 |
-02:16:37.2 |
HIP 63496 |
17.20 |