C/1993 F1 (Mueller)
| Parameter |
Value |
| Designation |
C/1993 F1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-08-04T20:31:29.202240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
102 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1993-08-21.0000000 |
| e |
1.00540314 |
| q (au) |
5.901066 |
| a (au) |
-1092.155238 |
| i (deg) |
53.940235 |
| Ω (om, deg) |
77.516468 |
| ω (w, deg) |
62.030036 |
| M (ma, deg) |
0.010408 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.931 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.931 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
18:11:12.43 |
-41:33:46.1 |
HIP 89099 |
12.29 |
| 2026-02-03 12:00 |
18:11:14.79 |
-41:33:54.1 |
HIP 89099 |
12.48 |
| 2026-02-04 00:00 |
18:11:17.13 |
-41:34:02.1 |
HIP 89099 |
12.68 |
| 2026-02-04 12:00 |
18:11:19.45 |
-41:34:10.3 |
HIP 89099 |
12.90 |
| 2026-02-05 00:00 |
18:11:21.75 |
-41:34:18.5 |
HIP 89099 |
13.12 |
| 2026-02-05 12:00 |
18:11:24.04 |
-41:34:26.8 |
HIP 89099 |
13.36 |
| 2026-02-06 00:00 |
18:11:26.31 |
-41:34:35.1 |
HIP 89099 |
13.61 |
| 2026-02-06 12:00 |
18:11:28.56 |
-41:34:43.5 |
HIP 89099 |
13.87 |
| 2026-02-07 00:00 |
18:11:30.79 |
-41:34:52.0 |
HIP 89225 |
13.63 |
| 2026-02-07 12:00 |
18:11:33.01 |
-41:35:00.5 |
HIP 89225 |
13.21 |
| 2026-02-08 00:00 |
18:11:35.21 |
-41:35:09.2 |
HIP 89225 |
12.79 |
| 2026-02-08 12:00 |
18:11:37.39 |
-41:35:17.8 |
HIP 89225 |
12.38 |
| 2026-02-09 00:00 |
18:11:39.55 |
-41:35:26.6 |
HIP 89225 |
11.98 |
| 2026-02-09 12:00 |
18:11:41.69 |
-41:35:35.4 |
HIP 89225 |
11.57 |
| 2026-02-10 00:00 |
18:11:43.82 |
-41:35:44.3 |
HIP 89225 |
11.17 |
| 2026-02-10 12:00 |
18:11:45.92 |
-41:35:53.2 |
HIP 89225 |
10.78 |
| 2026-02-11 00:00 |
18:11:48.01 |
-41:36:02.2 |
HIP 89225 |
10.39 |
| 2026-02-11 12:00 |
18:11:50.08 |
-41:36:11.2 |
HIP 89225 |
10.00 |
| 2026-02-12 00:00 |
18:11:52.13 |
-41:36:20.4 |
HIP 89225 |
9.62 |
| 2026-02-12 12:00 |
18:11:54.16 |
-41:36:29.6 |
HIP 89225 |
9.24 |
| 2026-02-13 00:00 |
18:11:56.17 |
-41:36:38.8 |
HIP 89225 |
8.86 |
| 2026-02-13 12:00 |
18:11:58.16 |
-41:36:48.1 |
HIP 89225 |
8.49 |
| 2026-02-14 00:00 |
18:12:00.13 |
-41:36:57.5 |
HIP 89225 |
8.13 |
| 2026-02-14 12:00 |
18:12:02.08 |
-41:37:06.9 |
HIP 89225 |
7.77 |
| 2026-02-15 00:00 |
18:12:04.02 |
-41:37:16.4 |
HIP 89225 |
7.41 |
| 2026-02-15 12:00 |
18:12:05.93 |
-41:37:25.9 |
HIP 89225 |
7.06 |
| 2026-02-16 00:00 |
18:12:07.82 |
-41:37:35.6 |
HIP 89225 |
6.72 |
| 2026-02-16 12:00 |
18:12:09.69 |
-41:37:45.2 |
HIP 89225 |
6.38 |
| 2026-02-17 00:00 |
18:12:11.54 |
-41:37:54.9 |
HIP 89225 |
6.05 |
| 2026-02-17 12:00 |
18:12:13.37 |
-41:38:04.7 |
HIP 89225 |
5.73 |
| 2026-02-18 00:00 |
18:12:15.17 |
-41:38:14.6 |
HIP 89225 |
5.42 |
| 2026-02-18 12:00 |
18:12:16.96 |
-41:38:24.4 |
HIP 89225 |
5.12 |
| 2026-02-19 00:00 |
18:12:18.72 |
-41:38:34.4 |
HIP 89225 |
4.82 |
| 2026-02-19 12:00 |
18:12:20.47 |
-41:38:44.4 |
HIP 89225 |
4.54 |
| 2026-02-20 00:00 |
18:12:22.19 |
-41:38:54.5 |
HIP 89225 |
4.27 |
| 2026-02-20 12:00 |
18:12:23.89 |
-41:39:04.6 |
HIP 89225 |
4.02 |
| 2026-02-21 00:00 |
18:12:25.57 |
-41:39:14.7 |
HIP 89225 |
3.78 |
| 2026-02-21 12:00 |
18:12:27.23 |
-41:39:24.9 |
HIP 89225 |
3.57 |
| 2026-02-22 00:00 |
18:12:28.86 |
-41:39:35.2 |
HIP 89225 |
3.37 |
| 2026-02-22 12:00 |
18:12:30.47 |
-41:39:45.5 |
HIP 89225 |
3.21 |
| 2026-02-23 00:00 |
18:12:32.07 |
-41:39:55.9 |
HIP 89225 |
3.07 |
| 2026-02-23 12:00 |
18:12:33.63 |
-41:40:06.3 |
HIP 89225 |
2.96 |
| 2026-02-24 00:00 |
18:12:35.18 |
-41:40:16.8 |
HIP 89225 |
2.88 |