| 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) |
| 2026-05-12 00:00 |
15:50:21.43 |
-29:30:45.9 |
HIP 77664 |
16.28 |
| 2026-05-12 12:00 |
15:50:01.66 |
-29:30:13.6 |
HIP 77457 |
15.18 |
| 2026-05-13 00:00 |
15:49:41.84 |
-29:29:40.3 |
HIP 77457 |
10.84 |
| 2026-05-13 12:00 |
15:49:21.97 |
-29:29:06.1 |
HIP 77457 |
6.49 |
| 2026-05-14 00:00 |
15:49:02.04 |
-29:28:31.1 |
HIP 77457 |
2.21 |
| 2026-05-14 12:00 |
15:48:42.07 |
-29:27:55.1 |
HIP 77457 |
2.44 |
| 2026-05-15 00:00 |
15:48:22.05 |
-29:27:18.3 |
HIP 77457 |
6.76 |
| 2026-05-15 12:00 |
15:48:02.00 |
-29:26:40.6 |
HIP 77374 |
9.08 |
| 2026-05-16 00:00 |
15:47:41.91 |
-29:26:02.0 |
HIP 77374 |
7.20 |
| 2026-05-16 12:00 |
15:47:21.78 |
-29:25:22.6 |
HIP 77374 |
7.76 |
| 2026-05-17 00:00 |
15:47:01.63 |
-29:24:42.3 |
HIP 77374 |
10.38 |
| 2026-05-17 12:00 |
15:46:41.45 |
-29:24:01.1 |
HIP 77374 |
13.96 |
| 2026-05-18 00:00 |
15:46:21.25 |
-29:23:19.1 |
HIP 77220 |
13.32 |
| 2026-05-18 12:00 |
15:46:01.03 |
-29:22:36.3 |
HIP 77220 |
11.75 |
| 2026-05-19 00:00 |
15:45:40.79 |
-29:21:52.7 |
HIP 77220 |
11.77 |
| 2026-05-19 12:00 |
15:45:20.55 |
-29:21:08.2 |
HIP 77220 |
13.37 |
| 2026-05-20 00:00 |
15:45:00.30 |
-29:20:23.0 |
HIP 77220 |
16.09 |
| 2026-05-20 12:00 |
15:44:40.04 |
-29:19:36.9 |
HIP 77220 |
19.47 |
| 2026-05-21 00:00 |
15:44:19.79 |
-29:18:50.0 |
HIP 76986 |
19.33 |
| 2026-05-21 12:00 |
15:43:59.54 |
-29:18:02.4 |
HIP 76986 |
16.75 |
| 2026-05-22 00:00 |
15:43:39.29 |
-29:17:14.0 |
HIP 76986 |
15.08 |
| 2026-05-22 12:00 |
15:43:19.06 |
-29:16:24.8 |
HIP 76986 |
14.67 |
| 2026-05-23 00:00 |
15:42:58.83 |
-29:15:34.9 |
HIP 76986 |
15.60 |
| 2026-05-23 12:00 |
15:42:38.63 |
-29:14:44.3 |
HIP 76851 |
14.66 |
| 2026-05-24 00:00 |
15:42:18.45 |
-29:13:52.9 |
HIP 76851 |
10.71 |
| 2026-05-24 12:00 |
15:41:58.29 |
-29:13:00.8 |
HIP 76851 |
7.41 |
| 2026-05-25 00:00 |
15:41:38.16 |
-29:12:08.0 |
HIP 76851 |
5.94 |
| 2026-05-25 12:00 |
15:41:18.06 |
-29:11:14.5 |
HIP 76851 |
7.48 |
| 2026-05-26 00:00 |
15:40:57.99 |
-29:10:20.3 |
HIP 76851 |
10.81 |
| 2026-05-26 12:00 |
15:40:37.96 |
-29:09:25.4 |
HIP 76728 |
7.93 |
| 2026-05-27 00:00 |
15:40:17.97 |
-29:08:29.8 |
HIP 76728 |
5.55 |
| 2026-05-27 12:00 |
15:39:58.02 |
-29:07:33.6 |
HIP 76728 |
6.20 |
| 2026-05-28 00:00 |
15:39:38.12 |
-29:06:36.8 |
HIP 76728 |
9.27 |
| 2026-05-28 12:00 |
15:39:18.27 |
-29:05:39.3 |
HIP 76728 |
13.14 |
| 2026-05-29 00:00 |
15:38:58.47 |
-29:04:41.2 |
HIP 76728 |
17.29 |
| 2026-05-29 12:00 |
15:38:38.73 |
-29:03:42.5 |
HIP 76728 |
21.54 |
| 2026-05-30 00:00 |
15:38:19.05 |
-29:02:43.2 |
HIP 76496 |
19.79 |
| 2026-05-30 12:00 |
15:37:59.43 |
-29:01:43.3 |
HIP 76496 |
18.51 |
| 2026-05-31 00:00 |
15:37:39.87 |
-29:00:42.9 |
HIP 76448 |
15.78 |
| 2026-05-31 12:00 |
15:37:20.38 |
-28:59:41.8 |
HIP 76448 |
13.89 |
| 2026-06-01 00:00 |
15:37:00.97 |
-28:58:40.3 |
HIP 76448 |
13.24 |
| 2026-06-01 12:00 |
15:36:41.63 |
-28:57:38.2 |
HIP 76448 |
14.01 |
| 2026-06-02 00:00 |
15:36:22.36 |
-28:56:35.5 |
HIP 76318 |
14.96 |