| 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 |
0.997 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:44:39.26 |
-11:03:02.0 |
HIP 32255 |
7.97 |
| 2026-06-03 00:00 |
06:44:41.24 |
-11:02:54.5 |
HIP 32255 |
8.38 |
| 2026-06-03 12:00 |
06:44:43.24 |
-11:02:47.2 |
HIP 32255 |
8.80 |
| 2026-06-04 00:00 |
06:44:45.24 |
-11:02:40.0 |
HIP 32255 |
9.23 |
| 2026-06-04 12:00 |
06:44:47.26 |
-11:02:33.0 |
HIP 32255 |
9.67 |
| 2026-06-05 00:00 |
06:44:49.28 |
-11:02:26.1 |
HIP 32255 |
10.13 |
| 2026-06-05 12:00 |
06:44:51.31 |
-11:02:19.4 |
HIP 32255 |
10.58 |
| 2026-06-06 00:00 |
06:44:53.35 |
-11:02:12.8 |
HIP 32255 |
11.05 |
| 2026-06-06 12:00 |
06:44:55.40 |
-11:02:06.5 |
HIP 32255 |
11.52 |
| 2026-06-07 00:00 |
06:44:57.45 |
-11:02:00.2 |
HIP 32255 |
12.00 |
| 2026-06-07 12:00 |
06:44:59.52 |
-11:01:54.1 |
HIP 32255 |
12.48 |
| 2026-06-08 00:00 |
06:45:01.59 |
-11:01:48.2 |
HIP 32255 |
12.97 |
| 2026-06-08 12:00 |
06:45:03.67 |
-11:01:42.5 |
HIP 32255 |
13.46 |
| 2026-06-09 00:00 |
06:45:05.75 |
-11:01:36.9 |
HIP 32255 |
13.96 |
| 2026-06-09 12:00 |
06:45:07.85 |
-11:01:31.4 |
HIP 32255 |
14.46 |
| 2026-06-10 00:00 |
06:45:09.95 |
-11:01:26.2 |
HIP 32255 |
14.97 |
| 2026-06-10 12:00 |
06:45:12.06 |
-11:01:21.0 |
HIP 32255 |
15.47 |
| 2026-06-11 00:00 |
06:45:14.17 |
-11:01:16.1 |
HIP 32255 |
15.98 |
| 2026-06-11 12:00 |
06:45:16.30 |
-11:01:11.3 |
HIP 32255 |
16.50 |
| 2026-06-12 00:00 |
06:45:18.43 |
-11:01:06.7 |
HIP 32255 |
17.01 |
| 2026-06-12 12:00 |
06:45:20.56 |
-11:01:02.2 |
HIP 32255 |
17.53 |
| 2026-06-13 00:00 |
06:45:22.70 |
-11:00:57.9 |
HIP 32255 |
18.05 |
| 2026-06-13 12:00 |
06:45:24.85 |
-11:00:53.7 |
HIP 32255 |
18.57 |
| 2026-06-14 00:00 |
06:45:27.01 |
-11:00:49.8 |
HIP 32255 |
19.10 |
| 2026-06-14 12:00 |
06:45:29.17 |
-11:00:46.0 |
HIP 32255 |
19.62 |
| 2026-06-15 00:00 |
06:45:31.33 |
-11:00:42.3 |
HIP 32255 |
20.15 |
| 2026-06-15 12:00 |
06:45:33.50 |
-11:00:38.8 |
HIP 32255 |
20.68 |
| 2026-06-16 00:00 |
06:45:35.68 |
-11:00:35.5 |
HIP 32255 |
21.22 |
| 2026-06-16 12:00 |
06:45:37.86 |
-11:00:32.4 |
HIP 32255 |
21.75 |
| 2026-06-17 00:00 |
06:45:40.05 |
-11:00:29.4 |
HIP 32255 |
22.29 |
| 2026-06-17 12:00 |
06:45:42.24 |
-11:00:26.5 |
HIP 32255 |
22.82 |
| 2026-06-18 00:00 |
06:45:44.43 |
-11:00:23.9 |
HIP 32255 |
23.36 |
| 2026-06-18 12:00 |
06:45:46.64 |
-11:00:21.4 |
HIP 32255 |
23.90 |
| 2026-06-19 00:00 |
06:45:48.84 |
-11:00:19.1 |
HIP 32255 |
24.44 |
| 2026-06-19 12:00 |
06:45:51.05 |
-11:00:16.9 |
HIP 32255 |
24.98 |
| 2026-06-20 00:00 |
06:45:53.26 |
-11:00:14.9 |
HIP 32255 |
25.52 |
| 2026-06-20 12:00 |
06:45:55.48 |
-11:00:13.1 |
HIP 32255 |
26.07 |
| 2026-06-21 00:00 |
06:45:57.70 |
-11:00:11.4 |
HIP 32255 |
26.61 |
| 2026-06-21 12:00 |
06:45:59.92 |
-11:00:09.9 |
HIP 32255 |
27.16 |
| 2026-06-22 00:00 |
06:46:02.15 |
-11:00:08.5 |
HIP 32255 |
27.70 |