| 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) |
| 2026-09-20 00:00 |
06:51:11.32 |
-11:34:40.5 |
HIP 32758 |
20.31 |
| 2026-09-20 12:00 |
06:51:11.80 |
-11:35:00.6 |
HIP 32758 |
20.50 |
| 2026-09-21 00:00 |
06:51:12.26 |
-11:35:20.7 |
HIP 32758 |
20.69 |
| 2026-09-21 12:00 |
06:51:12.70 |
-11:35:40.9 |
HIP 32758 |
20.88 |
| 2026-09-22 00:00 |
06:51:13.13 |
-11:36:01.1 |
HIP 32758 |
21.06 |
| 2026-09-22 12:00 |
06:51:13.53 |
-11:36:21.3 |
HIP 32758 |
21.25 |
| 2026-09-23 00:00 |
06:51:13.91 |
-11:36:41.5 |
HIP 32758 |
21.44 |
| 2026-09-23 12:00 |
06:51:14.27 |
-11:37:01.8 |
HIP 32758 |
21.62 |
| 2026-09-24 00:00 |
06:51:14.61 |
-11:37:22.0 |
HIP 32758 |
21.81 |
| 2026-09-24 12:00 |
06:51:14.93 |
-11:37:42.3 |
HIP 32758 |
21.99 |
| 2026-09-25 00:00 |
06:51:15.23 |
-11:38:02.6 |
HIP 32758 |
22.17 |
| 2026-09-25 12:00 |
06:51:15.51 |
-11:38:22.9 |
HIP 32758 |
22.36 |
| 2026-09-26 00:00 |
06:51:15.77 |
-11:38:43.2 |
HIP 32758 |
22.54 |
| 2026-09-26 12:00 |
06:51:16.01 |
-11:39:03.6 |
HIP 32758 |
22.72 |
| 2026-09-27 00:00 |
06:51:16.23 |
-11:39:23.9 |
HIP 32758 |
22.90 |
| 2026-09-27 12:00 |
06:51:16.43 |
-11:39:44.3 |
HIP 32758 |
23.08 |
| 2026-09-28 00:00 |
06:51:16.61 |
-11:40:04.6 |
HIP 32758 |
23.26 |
| 2026-09-28 12:00 |
06:51:16.77 |
-11:40:25.0 |
HIP 32758 |
23.44 |
| 2026-09-29 00:00 |
06:51:16.91 |
-11:40:45.3 |
HIP 32758 |
23.62 |
| 2026-09-29 12:00 |
06:51:17.03 |
-11:41:05.7 |
HIP 32758 |
23.79 |
| 2026-09-30 00:00 |
06:51:17.13 |
-11:41:26.1 |
HIP 32758 |
23.97 |
| 2026-09-30 12:00 |
06:51:17.20 |
-11:41:46.5 |
HIP 32758 |
24.14 |
| 2026-10-01 00:00 |
06:51:17.26 |
-11:42:06.8 |
HIP 32758 |
24.32 |
| 2026-10-01 12:00 |
06:51:17.30 |
-11:42:27.2 |
HIP 32758 |
24.49 |
| 2026-10-02 00:00 |
06:51:17.31 |
-11:42:47.5 |
HIP 32758 |
24.66 |
| 2026-10-02 12:00 |
06:51:17.31 |
-11:43:07.9 |
HIP 32758 |
24.83 |
| 2026-10-03 00:00 |
06:51:17.28 |
-11:43:28.2 |
HIP 32758 |
25.00 |
| 2026-10-03 12:00 |
06:51:17.23 |
-11:43:48.6 |
HIP 32758 |
25.17 |
| 2026-10-04 00:00 |
06:51:17.16 |
-11:44:08.9 |
HIP 32758 |
25.34 |
| 2026-10-04 12:00 |
06:51:17.08 |
-11:44:29.2 |
HIP 32758 |
25.51 |
| 2026-10-05 00:00 |
06:51:16.97 |
-11:44:49.5 |
HIP 32758 |
25.67 |
| 2026-10-05 12:00 |
06:51:16.83 |
-11:45:09.8 |
HIP 32758 |
25.84 |
| 2026-10-06 00:00 |
06:51:16.68 |
-11:45:30.0 |
HIP 32758 |
26.00 |
| 2026-10-06 12:00 |
06:51:16.51 |
-11:45:50.3 |
HIP 32758 |
26.16 |
| 2026-10-07 00:00 |
06:51:16.32 |
-11:46:10.5 |
HIP 32758 |
26.33 |
| 2026-10-07 12:00 |
06:51:16.10 |
-11:46:30.7 |
HIP 32758 |
26.49 |
| 2026-10-08 00:00 |
06:51:15.87 |
-11:46:50.9 |
HIP 32758 |
26.65 |
| 2026-10-08 12:00 |
06:51:15.61 |
-11:47:11.1 |
HIP 32758 |
26.81 |
| 2026-10-09 00:00 |
06:51:15.33 |
-11:47:31.2 |
HIP 32758 |
26.97 |
| 2026-10-09 12:00 |
06:51:15.03 |
-11:47:51.3 |
HIP 32758 |
27.12 |
| 2026-10-10 00:00 |
06:51:14.71 |
-11:48:11.4 |
HIP 32758 |
27.28 |
| 2026-10-10 12:00 |
06:51:14.37 |
-11:48:31.4 |
HIP 32758 |
27.44 |
| 2026-10-11 00:00 |
06:51:14.01 |
-11:48:51.4 |
HIP 32758 |
27.59 |