173P/Mueller 5
Metadata
| Parameter | Value |
|---|---|
| Designation | 173P/Mueller 5 |
| Type | P |
| Perihelion (tp_cal, UTC) | 2008-05-15T15:31:24.496320Z |
| Orbit solution date (soln_date, UTC) | 2023-06-30T22:18:07Z |
| Obs used | 1194 |
| NEO | - |
| M1 | 12.100 |
| K1 | 4.500 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2012-02-21.0000000 |
| e | 0.26135639 |
| q (au) | 4.203777 |
| a (au) | 5.691211 |
| i (deg) | 16.505508 |
| Ω (om, deg) | 100.496504 |
| ω (w, deg) | 29.393323 |
| M (ma, deg) | 99.914136 |
Magnitude
Scatter + Global Linear
$$ M_a = (13.418 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 13.418 |
| n | 2.000 |
| gf | 0.983 |
| gb | -0.612 |
| k | 0.800 |
| δ90 | 9.998 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2018-10-31 | 2020-03-17 | -28.6764 | +18.841 |
| 2020-03-17 | 2023-04-15 | +26.0210 | -18.793 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 18:22:46.88 | -19:16:35.8 | HIP 90153 | 20.42 |
| 2026-03-26 12:00 | 18:22:53.45 | -19:16:40.2 | HIP 90153 | 19.25 |
| 2026-03-27 00:00 | 18:22:59.86 | -19:16:44.7 | HIP 90153 | 18.15 |
| 2026-03-27 12:00 | 18:23:06.13 | -19:16:49.3 | HIP 90153 | 17.14 |
| 2026-03-28 00:00 | 18:23:12.25 | -19:16:54.0 | HIP 90153 | 16.22 |
| 2026-03-28 12:00 | 18:23:18.21 | -19:16:58.8 | HIP 90153 | 15.40 |
| 2026-03-29 00:00 | 18:23:24.02 | -19:17:03.7 | HIP 90153 | 14.68 |
| 2026-03-29 12:00 | 18:23:29.68 | -19:17:08.7 | HIP 90153 | 14.07 |
| 2026-03-30 00:00 | 18:23:35.18 | -19:17:13.8 | HIP 90153 | 13.58 |
| 2026-03-30 12:00 | 18:23:40.53 | -19:17:19.0 | HIP 90153 | 13.20 |
| 2026-03-31 00:00 | 18:23:45.73 | -19:17:24.4 | HIP 90153 | 12.93 |
| 2026-03-31 12:00 | 18:23:50.78 | -19:17:29.8 | HIP 90153 | 12.78 |
| 2026-04-01 00:00 | 18:23:55.67 | -19:17:35.4 | HIP 90153 | 12.73 |
| 2026-04-01 12:00 | 18:24:00.40 | -19:17:41.0 | HIP 90153 | 12.77 |
| 2026-04-02 00:00 | 18:24:04.98 | -19:17:46.8 | HIP 90153 | 12.91 |
| 2026-04-02 12:00 | 18:24:09.41 | -19:17:52.7 | HIP 90153 | 13.12 |
| 2026-04-03 00:00 | 18:24:13.67 | -19:17:58.8 | HIP 90153 | 13.39 |
| 2026-04-03 12:00 | 18:24:17.79 | -19:18:05.0 | HIP 90153 | 13.71 |
| 2026-04-04 00:00 | 18:24:21.74 | -19:18:11.3 | HIP 90153 | 14.07 |
| 2026-04-04 12:00 | 18:24:25.54 | -19:18:17.7 | HIP 90153 | 14.46 |
| 2026-04-05 00:00 | 18:24:29.18 | -19:18:24.2 | HIP 90153 | 14.87 |
| 2026-04-05 12:00 | 18:24:32.67 | -19:18:30.9 | HIP 90153 | 15.29 |
| 2026-04-06 00:00 | 18:24:35.99 | -19:18:37.8 | HIP 90153 | 15.72 |
| 2026-04-06 12:00 | 18:24:39.16 | -19:18:44.8 | HIP 90259 | 15.59 |
| 2026-04-07 00:00 | 18:24:42.17 | -19:18:51.9 | HIP 90259 | 15.25 |
| 2026-04-07 12:00 | 18:24:45.02 | -19:18:59.1 | HIP 90259 | 14.95 |
| 2026-04-08 00:00 | 18:24:47.71 | -19:19:06.6 | HIP 90259 | 14.68 |
| 2026-04-08 12:00 | 18:24:50.25 | -19:19:14.1 | HIP 90259 | 14.44 |
| 2026-04-09 00:00 | 18:24:52.62 | -19:19:21.8 | HIP 90259 | 14.22 |
| 2026-04-09 12:00 | 18:24:54.83 | -19:19:29.7 | HIP 90259 | 14.02 |
| 2026-04-10 00:00 | 18:24:56.88 | -19:19:37.7 | HIP 90259 | 13.85 |
| 2026-04-10 12:00 | 18:24:58.77 | -19:19:45.9 | HIP 90259 | 13.68 |
| 2026-04-11 00:00 | 18:25:00.50 | -19:19:54.2 | HIP 90259 | 13.53 |
| 2026-04-11 12:00 | 18:25:02.07 | -19:20:02.7 | HIP 90259 | 13.39 |
| 2026-04-12 00:00 | 18:25:03.47 | -19:20:11.4 | HIP 90259 | 13.26 |
| 2026-04-12 12:00 | 18:25:04.72 | -19:20:20.2 | HIP 90259 | 13.12 |
| 2026-04-13 00:00 | 18:25:05.80 | -19:20:29.2 | HIP 90259 | 12.99 |
| 2026-04-13 12:00 | 18:25:06.72 | -19:20:38.4 | HIP 90259 | 12.86 |
| 2026-04-14 00:00 | 18:25:07.48 | -19:20:47.7 | HIP 90259 | 12.72 |
| 2026-04-14 12:00 | 18:25:08.07 | -19:20:57.2 | HIP 90259 | 12.58 |
| 2026-04-15 00:00 | 18:25:08.50 | -19:21:06.9 | HIP 90259 | 12.44 |
| 2026-04-15 12:00 | 18:25:08.77 | -19:21:16.8 | HIP 90259 | 12.28 |
| 2026-04-16 00:00 | 18:25:08.88 | -19:21:26.8 | HIP 90259 | 12.12 |