| 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) |
| 2026-06-01 00:00 |
12:51:00.99 |
+00:31:03.6 |
HIP 62759 |
9.62 |
| 2026-06-01 12:00 |
12:50:54.04 |
+00:31:02.2 |
HIP 62759 |
11.34 |
| 2026-06-02 00:00 |
12:50:47.22 |
+00:30:59.8 |
HIP 62759 |
13.03 |
| 2026-06-02 12:00 |
12:50:40.55 |
+00:30:56.4 |
HIP 62633 |
13.09 |
| 2026-06-03 00:00 |
12:50:34.02 |
+00:30:52.1 |
HIP 62633 |
12.01 |
| 2026-06-03 12:00 |
12:50:27.64 |
+00:30:46.9 |
HIP 62633 |
11.10 |
| 2026-06-04 00:00 |
12:50:21.40 |
+00:30:40.7 |
HIP 62633 |
10.39 |
| 2026-06-04 12:00 |
12:50:15.31 |
+00:30:33.6 |
HIP 62633 |
9.91 |
| 2026-06-05 00:00 |
12:50:09.35 |
+00:30:25.6 |
HIP 62633 |
9.66 |
| 2026-06-05 12:00 |
12:50:03.55 |
+00:30:16.6 |
HIP 62633 |
9.66 |
| 2026-06-06 00:00 |
12:49:57.89 |
+00:30:06.7 |
HIP 62633 |
9.89 |
| 2026-06-06 12:00 |
12:49:52.37 |
+00:29:55.9 |
HIP 62633 |
10.32 |
| 2026-06-07 00:00 |
12:49:47.00 |
+00:29:44.1 |
HIP 62633 |
10.92 |
| 2026-06-07 12:00 |
12:49:41.78 |
+00:29:31.4 |
HIP 62633 |
11.64 |
| 2026-06-08 00:00 |
12:49:36.70 |
+00:29:17.8 |
HIP 62633 |
12.45 |
| 2026-06-08 12:00 |
12:49:31.77 |
+00:29:03.2 |
HIP 62633 |
13.33 |
| 2026-06-09 00:00 |
12:49:26.99 |
+00:28:47.8 |
HIP 62633 |
14.25 |
| 2026-06-09 12:00 |
12:49:22.35 |
+00:28:31.4 |
HIP 62633 |
15.21 |
| 2026-06-10 00:00 |
12:49:17.86 |
+00:28:14.0 |
HIP 62633 |
16.18 |
| 2026-06-10 12:00 |
12:49:13.51 |
+00:27:55.8 |
HIP 62633 |
17.16 |
| 2026-06-11 00:00 |
12:49:09.31 |
+00:27:36.6 |
HIP 62633 |
18.14 |
| 2026-06-11 12:00 |
12:49:05.26 |
+00:27:16.5 |
HIP 62633 |
19.11 |
| 2026-06-12 00:00 |
12:49:01.36 |
+00:26:55.5 |
HIP 62633 |
20.08 |
| 2026-06-12 12:00 |
12:48:57.60 |
+00:26:33.6 |
HIP 62633 |
21.04 |
| 2026-06-13 00:00 |
12:48:53.99 |
+00:26:10.7 |
HIP 62417 |
20.85 |
| 2026-06-13 12:00 |
12:48:50.53 |
+00:25:47.0 |
HIP 62417 |
20.00 |
| 2026-06-14 00:00 |
12:48:47.22 |
+00:25:22.3 |
HIP 62417 |
19.18 |
| 2026-06-14 12:00 |
12:48:44.05 |
+00:24:56.7 |
HIP 62417 |
18.42 |
| 2026-06-15 00:00 |
12:48:41.04 |
+00:24:30.2 |
HIP 62417 |
17.71 |
| 2026-06-15 12:00 |
12:48:38.17 |
+00:24:02.8 |
HIP 62417 |
17.05 |
| 2026-06-16 00:00 |
12:48:35.44 |
+00:23:34.5 |
HIP 62417 |
16.45 |
| 2026-06-16 12:00 |
12:48:32.87 |
+00:23:05.3 |
HIP 62417 |
15.91 |
| 2026-06-17 00:00 |
12:48:30.44 |
+00:22:35.3 |
HIP 62417 |
15.43 |
| 2026-06-17 12:00 |
12:48:28.16 |
+00:22:04.3 |
HIP 62417 |
15.01 |
| 2026-06-18 00:00 |
12:48:26.03 |
+00:21:32.4 |
HIP 62417 |
14.67 |
| 2026-06-18 12:00 |
12:48:24.04 |
+00:20:59.7 |
HIP 62417 |
14.39 |
| 2026-06-19 00:00 |
12:48:22.20 |
+00:20:26.0 |
HIP 62417 |
14.19 |
| 2026-06-19 12:00 |
12:48:20.50 |
+00:19:51.5 |
HIP 62417 |
14.06 |
| 2026-06-20 00:00 |
12:48:18.96 |
+00:19:16.2 |
HIP 62417 |
14.01 |
| 2026-06-20 12:00 |
12:48:17.55 |
+00:18:39.9 |
HIP 62417 |
14.03 |
| 2026-06-21 00:00 |
12:48:16.30 |
+00:18:02.8 |
HIP 62417 |
14.12 |
| 2026-06-21 12:00 |
12:48:15.19 |
+00:17:24.8 |
HIP 62417 |
14.28 |
| 2026-06-22 00:00 |
12:48:14.22 |
+00:16:46.0 |
HIP 62417 |
14.51 |