| Parameter |
Value |
| Designation |
129P/Shoemaker-Levy 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-02-10T02:31:43.579200Z |
| Orbit solution date (soln_date, UTC) |
2025-06-27T14:17:32Z |
| Obs used |
720 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-07-07.0000000 |
| e |
0.09063771 |
| q (au) |
3.913589 |
| a (au) |
4.303663 |
| i (deg) |
3.432831 |
| Ω (om, deg) |
185.156275 |
| ω (w, deg) |
309.132971 |
| M (ma, deg) |
335.922407 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.543 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.543 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.969 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
18:34:00.46 |
-19:39:15.5 |
HIP 91051 |
9.77 |
| 2026-09-20 12:00 |
18:34:08.19 |
-19:39:34.4 |
HIP 91051 |
8.52 |
| 2026-09-21 00:00 |
18:34:16.13 |
-19:39:53.0 |
HIP 91051 |
7.51 |
| 2026-09-21 12:00 |
18:34:24.29 |
-19:40:11.4 |
HIP 91051 |
6.89 |
| 2026-09-22 00:00 |
18:34:32.66 |
-19:40:29.6 |
HIP 91051 |
6.81 |
| 2026-09-22 12:00 |
18:34:41.24 |
-19:40:47.5 |
HIP 91051 |
7.32 |
| 2026-09-23 00:00 |
18:34:50.02 |
-19:41:05.1 |
HIP 91051 |
8.35 |
| 2026-09-23 12:00 |
18:34:59.01 |
-19:41:22.5 |
HIP 91051 |
9.77 |
| 2026-09-24 00:00 |
18:35:08.21 |
-19:41:39.6 |
HIP 91051 |
11.46 |
| 2026-09-24 12:00 |
18:35:17.62 |
-19:41:56.4 |
HIP 91051 |
13.34 |
| 2026-09-25 00:00 |
18:35:27.23 |
-19:42:13.0 |
HIP 91051 |
15.36 |
| 2026-09-25 12:00 |
18:35:37.05 |
-19:42:29.3 |
HIP 91051 |
17.49 |
| 2026-09-26 00:00 |
18:35:47.07 |
-19:42:45.3 |
HIP 91051 |
19.72 |
| 2026-09-26 12:00 |
18:35:57.29 |
-19:43:01.0 |
HIP 91051 |
22.02 |
| 2026-09-27 00:00 |
18:36:07.71 |
-19:43:16.4 |
HIP 91051 |
24.39 |
| 2026-09-27 12:00 |
18:36:18.33 |
-19:43:31.6 |
HIP 91344 |
23.30 |
| 2026-09-28 00:00 |
18:36:29.15 |
-19:43:46.5 |
HIP 91344 |
20.99 |
| 2026-09-28 12:00 |
18:36:40.18 |
-19:44:01.1 |
HIP 91344 |
18.70 |
| 2026-09-29 00:00 |
18:36:51.39 |
-19:44:15.4 |
HIP 91344 |
16.46 |
| 2026-09-29 12:00 |
18:37:02.81 |
-19:44:29.4 |
HIP 91344 |
14.33 |
| 2026-09-30 00:00 |
18:37:14.42 |
-19:44:43.1 |
HIP 91344 |
12.37 |
| 2026-09-30 12:00 |
18:37:26.23 |
-19:44:56.5 |
HIP 91344 |
10.74 |
| 2026-10-01 00:00 |
18:37:38.24 |
-19:45:09.6 |
HIP 91344 |
9.63 |
| 2026-10-01 12:00 |
18:37:50.43 |
-19:45:22.4 |
HIP 91344 |
9.28 |
| 2026-10-02 00:00 |
18:38:02.82 |
-19:45:34.9 |
HIP 91344 |
9.81 |
| 2026-10-02 12:00 |
18:38:15.41 |
-19:45:47.1 |
HIP 91344 |
11.12 |
| 2026-10-03 00:00 |
18:38:28.18 |
-19:45:59.0 |
HIP 91344 |
13.02 |
| 2026-10-03 12:00 |
18:38:41.15 |
-19:46:10.5 |
HIP 91344 |
15.31 |
| 2026-10-04 00:00 |
18:38:54.30 |
-19:46:21.7 |
HIP 91344 |
17.87 |
| 2026-10-04 12:00 |
18:39:07.65 |
-19:46:32.6 |
HIP 91344 |
20.61 |
| 2026-10-05 00:00 |
18:39:21.18 |
-19:46:43.2 |
HIP 91527 |
19.14 |
| 2026-10-05 12:00 |
18:39:34.90 |
-19:46:53.4 |
HIP 91527 |
17.93 |
| 2026-10-06 00:00 |
18:39:48.81 |
-19:47:03.3 |
HIP 91527 |
17.25 |
| 2026-10-06 12:00 |
18:40:02.90 |
-19:47:12.9 |
HIP 91527 |
17.19 |
| 2026-10-07 00:00 |
18:40:17.18 |
-19:47:22.1 |
HIP 91527 |
17.78 |
| 2026-10-07 12:00 |
18:40:31.65 |
-19:47:31.0 |
HIP 91527 |
18.98 |
| 2026-10-08 00:00 |
18:40:46.29 |
-19:47:39.6 |
HIP 91527 |
20.71 |
| 2026-10-08 12:00 |
18:41:01.12 |
-19:47:47.8 |
HIP 91527 |
22.86 |
| 2026-10-09 00:00 |
18:41:16.13 |
-19:47:55.6 |
HIP 91527 |
25.35 |
| 2026-10-09 12:00 |
18:41:31.32 |
-19:48:03.1 |
HIP 91527 |
28.10 |
| 2026-10-10 00:00 |
18:41:46.69 |
-19:48:10.2 |
HIP 91527 |
31.06 |
| 2026-10-10 12:00 |
18:42:02.24 |
-19:48:16.9 |
HIP 91736 |
30.92 |
| 2026-10-11 00:00 |
18:42:17.97 |
-19:48:23.3 |
HIP 91736 |
30.38 |