| Parameter |
Value |
| Designation |
C/1992 U1 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1993-03-25T16:18:34.217280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:44Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
11.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1993-02-25.0000000 |
| e |
0.99944533 |
| q (au) |
2.313656 |
| a (au) |
4171.194372 |
| i (deg) |
65.985593 |
| Ω (om, deg) |
55.299020 |
| ω (w, deg) |
54.864153 |
| M (ma, deg) |
359.999895 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.951 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.951 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.664 |
| k |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
16:03:47.49 |
-50:31:46.6 |
HIP 78694 |
18.64 |
| 2026-06-01 12:00 |
16:03:44.26 |
-50:31:40.5 |
HIP 78694 |
18.77 |
| 2026-06-02 00:00 |
16:03:41.04 |
-50:31:34.3 |
HIP 78578 |
18.67 |
| 2026-06-02 12:00 |
16:03:37.82 |
-50:31:28.0 |
HIP 78578 |
18.33 |
| 2026-06-03 00:00 |
16:03:34.61 |
-50:31:21.5 |
HIP 78578 |
17.99 |
| 2026-06-03 12:00 |
16:03:31.40 |
-50:31:14.9 |
HIP 78578 |
17.66 |
| 2026-06-04 00:00 |
16:03:28.19 |
-50:31:08.2 |
HIP 78578 |
17.34 |
| 2026-06-04 12:00 |
16:03:24.99 |
-50:31:01.4 |
HIP 78578 |
17.03 |
| 2026-06-05 00:00 |
16:03:21.80 |
-50:30:54.4 |
HIP 78578 |
16.72 |
| 2026-06-05 12:00 |
16:03:18.61 |
-50:30:47.3 |
HIP 78578 |
16.43 |
| 2026-06-06 00:00 |
16:03:15.43 |
-50:30:40.1 |
HIP 78578 |
16.15 |
| 2026-06-06 12:00 |
16:03:12.25 |
-50:30:32.7 |
HIP 78578 |
15.87 |
| 2026-06-07 00:00 |
16:03:09.09 |
-50:30:25.2 |
HIP 78578 |
15.61 |
| 2026-06-07 12:00 |
16:03:05.92 |
-50:30:17.6 |
HIP 78578 |
15.35 |
| 2026-06-08 00:00 |
16:03:02.77 |
-50:30:09.9 |
HIP 78578 |
15.11 |
| 2026-06-08 12:00 |
16:02:59.62 |
-50:30:02.0 |
HIP 78578 |
14.89 |
| 2026-06-09 00:00 |
16:02:56.48 |
-50:29:54.0 |
HIP 78578 |
14.67 |
| 2026-06-09 12:00 |
16:02:53.35 |
-50:29:45.9 |
HIP 78578 |
14.47 |
| 2026-06-10 00:00 |
16:02:50.22 |
-50:29:37.7 |
HIP 78578 |
14.28 |
| 2026-06-10 12:00 |
16:02:47.10 |
-50:29:29.3 |
HIP 78578 |
14.11 |
| 2026-06-11 00:00 |
16:02:43.99 |
-50:29:20.9 |
HIP 78578 |
13.95 |
| 2026-06-11 12:00 |
16:02:40.89 |
-50:29:12.3 |
HIP 78578 |
13.81 |
| 2026-06-12 00:00 |
16:02:37.80 |
-50:29:03.6 |
HIP 78578 |
13.68 |
| 2026-06-12 12:00 |
16:02:34.72 |
-50:28:54.7 |
HIP 78578 |
13.57 |
| 2026-06-13 00:00 |
16:02:31.65 |
-50:28:45.8 |
HIP 78578 |
13.47 |
| 2026-06-13 12:00 |
16:02:28.58 |
-50:28:36.7 |
HIP 78578 |
13.39 |
| 2026-06-14 00:00 |
16:02:25.53 |
-50:28:27.6 |
HIP 78578 |
13.33 |
| 2026-06-14 12:00 |
16:02:22.49 |
-50:28:18.3 |
HIP 78578 |
13.29 |
| 2026-06-15 00:00 |
16:02:19.46 |
-50:28:08.9 |
HIP 78578 |
13.26 |
| 2026-06-15 12:00 |
16:02:16.43 |
-50:27:59.3 |
HIP 78578 |
13.25 |
| 2026-06-16 00:00 |
16:02:13.42 |
-50:27:49.7 |
HIP 78578 |
13.26 |
| 2026-06-16 12:00 |
16:02:10.42 |
-50:27:40.0 |
HIP 78578 |
13.29 |
| 2026-06-17 00:00 |
16:02:07.43 |
-50:27:30.1 |
HIP 78578 |
13.33 |
| 2026-06-17 12:00 |
16:02:04.46 |
-50:27:20.2 |
HIP 78578 |
13.39 |
| 2026-06-18 00:00 |
16:02:01.49 |
-50:27:10.1 |
HIP 78578 |
13.46 |
| 2026-06-18 12:00 |
16:01:58.54 |
-50:27:00.0 |
HIP 78578 |
13.55 |
| 2026-06-19 00:00 |
16:01:55.60 |
-50:26:49.6 |
HIP 78578 |
13.65 |
| 2026-06-19 12:00 |
16:01:52.67 |
-50:26:39.2 |
HIP 78578 |
13.77 |
| 2026-06-20 00:00 |
16:01:49.76 |
-50:26:28.7 |
HIP 78578 |
13.91 |
| 2026-06-20 12:00 |
16:01:46.85 |
-50:26:18.1 |
HIP 78578 |
14.05 |
| 2026-06-21 00:00 |
16:01:43.97 |
-50:26:07.5 |
HIP 78578 |
14.21 |
| 2026-06-21 12:00 |
16:01:41.09 |
-50:25:56.7 |
HIP 78578 |
14.39 |
| 2026-06-22 00:00 |
16:01:38.23 |
-50:25:45.8 |
HIP 78578 |
14.57 |