| Parameter |
Value |
| Designation |
C/1994 E1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1993-11-28T11:07:06.925440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
12.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1994-04-09.0000000 |
| e |
0.96835181 |
| q (au) |
1.751261 |
| a (au) |
55.335279 |
| i (deg) |
145.140300 |
| Ω (om, deg) |
5.175425 |
| ω (w, deg) |
98.924517 |
| M (ma, deg) |
0.314955 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.413 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.413 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.583 |
| 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) |
| 2026-05-12 00:00 |
06:43:24.33 |
-11:10:44.2 |
HIP 32255 |
15.41 |
| 2026-05-12 12:00 |
06:43:25.80 |
-11:10:30.6 |
HIP 32255 |
14.99 |
| 2026-05-13 00:00 |
06:43:27.28 |
-11:10:17.0 |
HIP 32255 |
14.58 |
| 2026-05-13 12:00 |
06:43:28.78 |
-11:10:03.6 |
HIP 32255 |
14.16 |
| 2026-05-14 00:00 |
06:43:30.29 |
-11:09:50.3 |
HIP 32255 |
13.74 |
| 2026-05-14 12:00 |
06:43:31.82 |
-11:09:37.1 |
HIP 32255 |
13.32 |
| 2026-05-15 00:00 |
06:43:33.36 |
-11:09:24.1 |
HIP 32255 |
12.91 |
| 2026-05-15 12:00 |
06:43:34.91 |
-11:09:11.2 |
HIP 32255 |
12.49 |
| 2026-05-16 00:00 |
06:43:36.48 |
-11:08:58.4 |
HIP 32255 |
12.07 |
| 2026-05-16 12:00 |
06:43:38.07 |
-11:08:45.8 |
HIP 32255 |
11.66 |
| 2026-05-17 00:00 |
06:43:39.66 |
-11:08:33.3 |
HIP 32255 |
11.25 |
| 2026-05-17 12:00 |
06:43:41.27 |
-11:08:21.0 |
HIP 32255 |
10.83 |
| 2026-05-18 00:00 |
06:43:42.90 |
-11:08:08.7 |
HIP 32255 |
10.43 |
| 2026-05-18 12:00 |
06:43:44.54 |
-11:07:56.7 |
HIP 32255 |
10.02 |
| 2026-05-19 00:00 |
06:43:46.19 |
-11:07:44.7 |
HIP 32255 |
9.62 |
| 2026-05-19 12:00 |
06:43:47.85 |
-11:07:32.9 |
HIP 32255 |
9.22 |
| 2026-05-20 00:00 |
06:43:49.53 |
-11:07:21.3 |
HIP 32255 |
8.83 |
| 2026-05-20 12:00 |
06:43:51.22 |
-11:07:09.8 |
HIP 32255 |
8.45 |
| 2026-05-21 00:00 |
06:43:52.92 |
-11:06:58.4 |
HIP 32255 |
8.07 |
| 2026-05-21 12:00 |
06:43:54.64 |
-11:06:47.2 |
HIP 32255 |
7.70 |
| 2026-05-22 00:00 |
06:43:56.37 |
-11:06:36.1 |
HIP 32255 |
7.35 |
| 2026-05-22 12:00 |
06:43:58.11 |
-11:06:25.2 |
HIP 32255 |
7.01 |
| 2026-05-23 00:00 |
06:43:59.86 |
-11:06:14.4 |
HIP 32255 |
6.68 |
| 2026-05-23 12:00 |
06:44:01.63 |
-11:06:03.7 |
HIP 32255 |
6.37 |
| 2026-05-24 00:00 |
06:44:03.41 |
-11:05:53.2 |
HIP 32255 |
6.09 |
| 2026-05-24 12:00 |
06:44:05.20 |
-11:05:42.9 |
HIP 32255 |
5.83 |
| 2026-05-25 00:00 |
06:44:07.00 |
-11:05:32.6 |
HIP 32255 |
5.60 |
| 2026-05-25 12:00 |
06:44:08.81 |
-11:05:22.6 |
HIP 32255 |
5.41 |
| 2026-05-26 00:00 |
06:44:10.63 |
-11:05:12.7 |
HIP 32255 |
5.25 |
| 2026-05-26 12:00 |
06:44:12.47 |
-11:05:02.9 |
HIP 32255 |
5.14 |
| 2026-05-27 00:00 |
06:44:14.31 |
-11:04:53.3 |
HIP 32255 |
5.07 |
| 2026-05-27 12:00 |
06:44:16.17 |
-11:04:43.8 |
HIP 32255 |
5.05 |
| 2026-05-28 00:00 |
06:44:18.04 |
-11:04:34.5 |
HIP 32255 |
5.08 |
| 2026-05-28 12:00 |
06:44:19.91 |
-11:04:25.3 |
HIP 32255 |
5.16 |
| 2026-05-29 00:00 |
06:44:21.80 |
-11:04:16.3 |
HIP 32255 |
5.29 |
| 2026-05-29 12:00 |
06:44:23.70 |
-11:04:07.4 |
HIP 32255 |
5.46 |
| 2026-05-30 00:00 |
06:44:25.61 |
-11:03:58.7 |
HIP 32255 |
5.67 |
| 2026-05-30 12:00 |
06:44:27.53 |
-11:03:50.2 |
HIP 32255 |
5.92 |
| 2026-05-31 00:00 |
06:44:29.46 |
-11:03:41.8 |
HIP 32255 |
6.20 |
| 2026-05-31 12:00 |
06:44:31.40 |
-11:03:33.5 |
HIP 32255 |
6.51 |
| 2026-06-01 00:00 |
06:44:33.35 |
-11:03:25.4 |
HIP 32255 |
6.85 |
| 2026-06-01 12:00 |
06:44:35.31 |
-11:03:17.4 |
HIP 32255 |
7.20 |
| 2026-06-02 00:00 |
06:44:37.28 |
-11:03:09.6 |
HIP 32255 |
7.58 |