C/1986 E1 (Shoemaker)
| Parameter |
Value |
| Designation |
C/1986 E1 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-03-11T06:37:30.054720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1986-06-17.0000000 |
| e |
0.94684032 |
| q (au) |
3.593858 |
| a (au) |
67.604972 |
| i (deg) |
159.808447 |
| Ω (om, deg) |
294.843600 |
| ω (w, deg) |
123.567998 |
| M (ma, deg) |
0.173276 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.197 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.197 |
| n |
6.000 |
| gf |
0.961 |
| gb |
-0.509 |
| k |
1.000 |
| δ90 |
9.900 |
| 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) |
| 2026-02-03 00:00 |
01:15:03.29 |
-13:17:00.4 |
HIP 5764 |
19.00 |
| 2026-02-03 12:00 |
01:15:04.00 |
-13:16:45.7 |
HIP 5764 |
19.28 |
| 2026-02-04 00:00 |
01:15:04.73 |
-13:16:30.9 |
HIP 5764 |
19.57 |
| 2026-02-04 12:00 |
01:15:05.48 |
-13:16:16.0 |
HIP 5764 |
19.87 |
| 2026-02-05 00:00 |
01:15:06.24 |
-13:16:01.2 |
HIP 5764 |
20.17 |
| 2026-02-05 12:00 |
01:15:07.02 |
-13:15:46.3 |
HIP 5764 |
20.47 |
| 2026-02-06 00:00 |
01:15:07.82 |
-13:15:31.3 |
HIP 5764 |
20.78 |
| 2026-02-06 12:00 |
01:15:08.63 |
-13:15:16.3 |
HIP 5764 |
21.09 |
| 2026-02-07 00:00 |
01:15:09.45 |
-13:15:01.3 |
HIP 5764 |
21.40 |
| 2026-02-07 12:00 |
01:15:10.30 |
-13:14:46.2 |
HIP 5764 |
21.72 |
| 2026-02-08 00:00 |
01:15:11.15 |
-13:14:31.1 |
HIP 5764 |
22.04 |
| 2026-02-08 12:00 |
01:15:12.03 |
-13:14:16.0 |
HIP 5764 |
22.37 |
| 2026-02-09 00:00 |
01:15:12.91 |
-13:14:00.8 |
HIP 5764 |
22.69 |
| 2026-02-09 12:00 |
01:15:13.82 |
-13:13:45.6 |
HIP 5764 |
23.03 |
| 2026-02-10 00:00 |
01:15:14.74 |
-13:13:30.3 |
HIP 5764 |
23.36 |
| 2026-02-10 12:00 |
01:15:15.67 |
-13:13:15.1 |
HIP 5764 |
23.70 |
| 2026-02-11 00:00 |
01:15:16.62 |
-13:12:59.8 |
HIP 5764 |
24.04 |
| 2026-02-11 12:00 |
01:15:17.58 |
-13:12:44.5 |
HIP 5764 |
24.38 |
| 2026-02-12 00:00 |
01:15:18.56 |
-13:12:29.1 |
HIP 5764 |
24.73 |
| 2026-02-12 12:00 |
01:15:19.55 |
-13:12:13.7 |
HIP 5764 |
25.08 |
| 2026-02-13 00:00 |
01:15:20.56 |
-13:11:58.3 |
HIP 5764 |
25.43 |
| 2026-02-13 12:00 |
01:15:21.59 |
-13:11:42.9 |
HIP 5764 |
25.79 |
| 2026-02-14 00:00 |
01:15:22.62 |
-13:11:27.5 |
HIP 5764 |
26.15 |
| 2026-02-14 12:00 |
01:15:23.67 |
-13:11:12.0 |
HIP 5764 |
26.51 |
| 2026-02-15 00:00 |
01:15:24.74 |
-13:10:56.5 |
HIP 5764 |
26.88 |
| 2026-02-15 12:00 |
01:15:25.82 |
-13:10:41.0 |
HIP 6008 |
27.18 |
| 2026-02-16 00:00 |
01:15:26.92 |
-13:10:25.5 |
HIP 6008 |
26.97 |
| 2026-02-16 12:00 |
01:15:28.02 |
-13:10:09.9 |
HIP 6008 |
26.76 |
| 2026-02-17 00:00 |
01:15:29.15 |
-13:09:54.4 |
HIP 6008 |
26.55 |
| 2026-02-17 12:00 |
01:15:30.28 |
-13:09:38.8 |
HIP 6008 |
26.34 |
| 2026-02-18 00:00 |
01:15:31.43 |
-13:09:23.2 |
HIP 6008 |
26.13 |
| 2026-02-18 12:00 |
01:15:32.60 |
-13:09:07.7 |
HIP 6008 |
25.92 |
| 2026-02-19 00:00 |
01:15:33.77 |
-13:08:52.1 |
HIP 6008 |
25.71 |
| 2026-02-19 12:00 |
01:15:34.96 |
-13:08:36.5 |
HIP 6008 |
25.51 |
| 2026-02-20 00:00 |
01:15:36.17 |
-13:08:20.9 |
HIP 6008 |
25.30 |
| 2026-02-20 12:00 |
01:15:37.38 |
-13:08:05.2 |
HIP 6008 |
25.10 |
| 2026-02-21 00:00 |
01:15:38.61 |
-13:07:49.6 |
HIP 6008 |
24.89 |
| 2026-02-21 12:00 |
01:15:39.86 |
-13:07:34.0 |
HIP 6008 |
24.69 |
| 2026-02-22 00:00 |
01:15:41.11 |
-13:07:18.4 |
HIP 6008 |
24.49 |
| 2026-02-22 12:00 |
01:15:42.38 |
-13:07:02.7 |
HIP 6008 |
24.30 |
| 2026-02-23 00:00 |
01:15:43.66 |
-13:06:47.1 |
HIP 6008 |
24.10 |
| 2026-02-23 12:00 |
01:15:44.96 |
-13:06:31.5 |
HIP 6008 |
23.91 |
| 2026-02-24 00:00 |
01:15:46.26 |
-13:06:15.9 |
HIP 6008 |
23.72 |