149P/Mueller 4
| Parameter |
Value |
| Designation |
149P/Mueller 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-02-18T16:52:27.373440Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:05Z |
| Obs used |
494 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-05.0000000 |
| e |
0.38831799 |
| q (au) |
2.646439 |
| a (au) |
4.326494 |
| i (deg) |
29.754798 |
| Ω (om, deg) |
145.255090 |
| ω (w, deg) |
43.567077 |
| M (ma, deg) |
128.282351 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.267 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.267 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.532 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:32:31.52 |
-04:40:24.8 |
HIP 31196 |
13.67 |
| 2026-02-03 12:00 |
06:32:17.00 |
-04:34:43.4 |
HIP 31196 |
9.89 |
| 2026-02-04 00:00 |
06:32:02.74 |
-04:29:00.5 |
HIP 31196 |
9.92 |
| 2026-02-04 12:00 |
06:31:48.75 |
-04:23:16.2 |
HIP 31196 |
13.71 |
| 2026-02-05 00:00 |
06:31:35.03 |
-04:17:30.4 |
HIP 31196 |
19.13 |
| 2026-02-05 12:00 |
06:31:21.58 |
-04:11:43.2 |
HIP 31196 |
25.13 |
| 2026-02-06 00:00 |
06:31:08.41 |
-04:05:54.7 |
HIP 31040 |
23.72 |
| 2026-02-06 12:00 |
06:30:55.51 |
-04:00:04.9 |
HIP 31040 |
17.42 |
| 2026-02-07 00:00 |
06:30:42.90 |
-03:54:13.8 |
HIP 31040 |
11.50 |
| 2026-02-07 12:00 |
06:30:30.56 |
-03:48:21.6 |
HIP 31040 |
6.97 |
| 2026-02-08 00:00 |
06:30:18.52 |
-03:42:28.2 |
HIP 31040 |
7.20 |
| 2026-02-08 12:00 |
06:30:06.76 |
-03:36:33.6 |
HIP 30938 |
8.22 |
| 2026-02-09 00:00 |
06:29:55.29 |
-03:30:38.0 |
HIP 30938 |
5.21 |
| 2026-02-09 12:00 |
06:29:44.12 |
-03:24:41.3 |
HIP 30938 |
8.60 |
| 2026-02-10 00:00 |
06:29:33.24 |
-03:18:43.7 |
HIP 30938 |
14.40 |
| 2026-02-10 12:00 |
06:29:22.65 |
-03:12:45.1 |
HIP 31010 |
19.68 |
| 2026-02-11 00:00 |
06:29:12.37 |
-03:06:45.6 |
HIP 30920 |
18.21 |
| 2026-02-11 12:00 |
06:29:02.39 |
-03:00:45.2 |
HIP 30920 |
13.06 |
| 2026-02-12 00:00 |
06:28:52.71 |
-02:54:44.1 |
HIP 30920 |
9.64 |
| 2026-02-12 12:00 |
06:28:43.33 |
-02:48:42.1 |
HIP 30920 |
9.90 |
| 2026-02-13 00:00 |
06:28:34.27 |
-02:42:39.4 |
HIP 30754 |
12.58 |
| 2026-02-13 12:00 |
06:28:25.51 |
-02:36:36.0 |
HIP 30871 |
8.83 |
| 2026-02-14 00:00 |
06:28:17.06 |
-02:30:31.9 |
HIP 30871 |
8.57 |
| 2026-02-14 12:00 |
06:28:08.92 |
-02:24:27.3 |
HIP 30871 |
12.24 |
| 2026-02-15 00:00 |
06:28:01.10 |
-02:18:22.1 |
HIP 30871 |
17.51 |
| 2026-02-15 12:00 |
06:27:53.59 |
-02:12:16.3 |
HIP 30871 |
23.30 |
| 2026-02-16 00:00 |
06:27:46.40 |
-02:06:10.1 |
HIP 30871 |
29.30 |
| 2026-02-16 12:00 |
06:27:39.52 |
-02:00:03.4 |
HIP 30611 |
27.53 |
| 2026-02-17 00:00 |
06:27:32.97 |
-01:53:56.3 |
HIP 30611 |
24.04 |
| 2026-02-17 12:00 |
06:27:26.74 |
-01:47:48.8 |
HIP 30666 |
20.99 |
| 2026-02-18 00:00 |
06:27:20.82 |
-01:41:41.0 |
HIP 30666 |
15.25 |
| 2026-02-18 12:00 |
06:27:15.23 |
-01:35:33.0 |
HIP 30666 |
10.27 |
| 2026-02-19 00:00 |
06:27:09.97 |
-01:29:24.7 |
HIP 30666 |
7.66 |
| 2026-02-19 12:00 |
06:27:05.02 |
-01:23:16.2 |
HIP 30666 |
9.58 |
| 2026-02-20 00:00 |
06:27:00.41 |
-01:17:07.5 |
HIP 30667 |
13.74 |
| 2026-02-20 12:00 |
06:26:56.12 |
-01:10:58.7 |
HIP 30667 |
7.75 |
| 2026-02-21 00:00 |
06:26:52.15 |
-01:04:49.8 |
HIP 30667 |
3.15 |
| 2026-02-21 12:00 |
06:26:48.51 |
-00:58:40.9 |
HIP 30667 |
6.14 |
| 2026-02-22 00:00 |
06:26:45.20 |
-00:52:31.9 |
HIP 30650 |
7.76 |
| 2026-02-22 12:00 |
06:26:42.22 |
-00:46:23.0 |
HIP 30650 |
4.27 |
| 2026-02-23 00:00 |
06:26:39.56 |
-00:40:14.2 |
HIP 30650 |
7.32 |
| 2026-02-23 12:00 |
06:26:37.24 |
-00:34:05.4 |
HIP 30650 |
12.87 |
| 2026-02-24 00:00 |
06:26:35.24 |
-00:27:56.8 |
HIP 30720 |
15.21 |