| Parameter |
Value |
| Designation |
120P/Mueller 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-09-29T10:29:13.793280Z |
| Orbit solution date (soln_date, UTC) |
2022-02-14T01:12:50Z |
| Obs used |
147 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
26.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-09-06.0000000 |
| e |
0.33653878 |
| q (au) |
2.743863 |
| a (au) |
4.135679 |
| i (deg) |
8.791195 |
| Ω (om, deg) |
4.442767 |
| ω (w, deg) |
30.008025 |
| M (ma, deg) |
125.574538 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.540 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.540 |
| 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) |
| 2026-03-26 00:00 |
16:10:53.04 |
-29:15:14.4 |
HIP 79247 |
6.70 |
| 2026-03-26 12:00 |
16:10:49.05 |
-29:16:00.2 |
HIP 79247 |
5.69 |
| 2026-03-27 00:00 |
16:10:44.84 |
-29:16:45.3 |
HIP 79247 |
4.69 |
| 2026-03-27 12:00 |
16:10:40.41 |
-29:17:29.9 |
HIP 79247 |
3.75 |
| 2026-03-28 00:00 |
16:10:35.75 |
-29:18:13.8 |
HIP 79247 |
2.96 |
| 2026-03-28 12:00 |
16:10:30.87 |
-29:18:57.1 |
HIP 79247 |
2.55 |
| 2026-03-29 00:00 |
16:10:25.77 |
-29:19:39.8 |
HIP 79247 |
2.71 |
| 2026-03-29 12:00 |
16:10:20.45 |
-29:20:21.9 |
HIP 79247 |
3.42 |
| 2026-03-30 00:00 |
16:10:14.90 |
-29:21:03.3 |
HIP 79247 |
4.46 |
| 2026-03-30 12:00 |
16:10:09.14 |
-29:21:44.1 |
HIP 79247 |
5.66 |
| 2026-03-31 00:00 |
16:10:03.15 |
-29:22:24.2 |
HIP 79247 |
6.97 |
| 2026-03-31 12:00 |
16:09:56.94 |
-29:23:03.7 |
HIP 79247 |
8.36 |
| 2026-04-01 00:00 |
16:09:50.51 |
-29:23:42.6 |
HIP 79142 |
9.71 |
| 2026-04-01 12:00 |
16:09:43.87 |
-29:24:20.8 |
HIP 79142 |
8.97 |
| 2026-04-02 00:00 |
16:09:37.00 |
-29:24:58.3 |
HIP 79142 |
8.42 |
| 2026-04-02 12:00 |
16:09:29.91 |
-29:25:35.1 |
HIP 79142 |
8.14 |
| 2026-04-03 00:00 |
16:09:22.60 |
-29:26:11.2 |
HIP 79142 |
8.17 |
| 2026-04-03 12:00 |
16:09:15.08 |
-29:26:46.7 |
HIP 79142 |
8.53 |
| 2026-04-04 00:00 |
16:09:07.34 |
-29:27:21.5 |
HIP 79142 |
9.20 |
| 2026-04-04 12:00 |
16:08:59.38 |
-29:27:55.5 |
HIP 79142 |
10.15 |
| 2026-04-05 00:00 |
16:08:51.20 |
-29:28:28.9 |
HIP 79142 |
11.33 |
| 2026-04-05 12:00 |
16:08:42.81 |
-29:29:01.5 |
HIP 79142 |
12.69 |
| 2026-04-06 00:00 |
16:08:34.20 |
-29:29:33.4 |
HIP 79004 |
12.68 |
| 2026-04-06 12:00 |
16:08:25.37 |
-29:30:04.6 |
HIP 79004 |
10.84 |
| 2026-04-07 00:00 |
16:08:16.33 |
-29:30:35.1 |
HIP 79004 |
9.02 |
| 2026-04-07 12:00 |
16:08:07.08 |
-29:31:04.8 |
HIP 79004 |
7.27 |
| 2026-04-08 00:00 |
16:07:57.61 |
-29:31:33.8 |
HIP 79004 |
5.69 |
| 2026-04-08 12:00 |
16:07:47.94 |
-29:32:02.0 |
HIP 79004 |
4.52 |
| 2026-04-09 00:00 |
16:07:38.05 |
-29:32:29.4 |
HIP 79004 |
4.21 |
| 2026-04-09 12:00 |
16:07:27.95 |
-29:32:56.1 |
HIP 79004 |
4.97 |
| 2026-04-10 00:00 |
16:07:17.64 |
-29:33:22.0 |
HIP 79004 |
6.48 |
| 2026-04-10 12:00 |
16:07:07.12 |
-29:33:47.2 |
HIP 79004 |
8.38 |
| 2026-04-11 00:00 |
16:06:56.40 |
-29:34:11.5 |
HIP 79004 |
10.48 |
| 2026-04-11 12:00 |
16:06:45.46 |
-29:34:35.1 |
HIP 79004 |
12.70 |
| 2026-04-12 00:00 |
16:06:34.33 |
-29:34:57.9 |
HIP 79004 |
15.02 |
| 2026-04-12 12:00 |
16:06:22.98 |
-29:35:19.8 |
HIP 78952 |
16.63 |
| 2026-04-13 00:00 |
16:06:11.44 |
-29:35:41.0 |
HIP 78952 |
17.75 |
| 2026-04-13 12:00 |
16:05:59.69 |
-29:36:01.3 |
HIP 78952 |
19.19 |
| 2026-04-14 00:00 |
16:05:47.75 |
-29:36:20.8 |
HIP 78952 |
20.89 |
| 2026-04-14 12:00 |
16:05:35.60 |
-29:36:39.5 |
HIP 78952 |
22.80 |
| 2026-04-15 00:00 |
16:05:23.26 |
-29:36:57.4 |
HIP 78952 |
24.90 |
| 2026-04-15 12:00 |
16:05:10.72 |
-29:37:14.4 |
HIP 78952 |
27.14 |
| 2026-04-16 00:00 |
16:04:57.98 |
-29:37:30.6 |
HIP 78952 |
29.52 |