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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 18:00:14.28 | -19:07:44.2 | HIP 88167 | 6.60 |
| 2026-02-03 12:00 | 18:00:32.89 | -19:07:55.5 | HIP 88167 | 6.24 |
| 2026-02-04 00:00 | 18:00:51.41 | -19:08:06.6 | HIP 88167 | 8.53 |
| 2026-02-04 12:00 | 18:01:09.86 | -19:08:17.4 | HIP 88297 | 10.20 |
| 2026-02-05 00:00 | 18:01:28.22 | -19:08:28.1 | HIP 88297 | 6.06 |
| 2026-02-05 12:00 | 18:01:46.50 | -19:08:38.5 | HIP 88297 | 2.65 |
| 2026-02-06 00:00 | 18:02:04.70 | -19:08:48.8 | HIP 88297 | 3.82 |
| 2026-02-06 12:00 | 18:02:22.82 | -19:08:58.8 | HIP 88341 | 1.93 |
| 2026-02-07 00:00 | 18:02:40.85 | -19:09:08.6 | HIP 88341 | 3.23 |
| 2026-02-07 12:00 | 18:02:58.79 | -19:09:18.3 | HIP 88341 | 7.29 |
| 2026-02-08 00:00 | 18:03:16.65 | -19:09:27.7 | HIP 88341 | 11.46 |
| 2026-02-08 12:00 | 18:03:34.42 | -19:09:36.9 | HIP 88341 | 15.64 |
| 2026-02-09 00:00 | 18:03:52.11 | -19:09:46.0 | HIP 88341 | 19.80 |
| 2026-02-09 12:00 | 18:04:09.70 | -19:09:54.8 | HIP 88341 | 23.95 |
| 2026-02-10 00:00 | 18:04:27.21 | -19:10:03.5 | HIP 88341 | 28.08 |
| 2026-02-10 12:00 | 18:04:44.62 | -19:10:12.0 | HIP 88704 | 25.89 |
| 2026-02-11 00:00 | 18:05:01.94 | -19:10:20.3 | HIP 88704 | 21.98 |
| 2026-02-11 12:00 | 18:05:19.17 | -19:10:28.5 | HIP 88704 | 18.16 |
| 2026-02-12 00:00 | 18:05:36.31 | -19:10:36.4 | HIP 88704 | 14.51 |
| 2026-02-12 12:00 | 18:05:53.36 | -19:10:44.2 | HIP 88704 | 11.14 |
| 2026-02-13 00:00 | 18:06:10.31 | -19:10:51.8 | HIP 88704 | 8.40 |
| 2026-02-13 12:00 | 18:06:27.16 | -19:10:59.2 | HIP 88704 | 6.99 |
| 2026-02-14 00:00 | 18:06:43.92 | -19:11:06.5 | HIP 88704 | 7.67 |
| 2026-02-14 12:00 | 18:07:00.58 | -19:11:13.6 | HIP 88704 | 9.99 |
| 2026-02-15 00:00 | 18:07:17.14 | -19:11:20.6 | HIP 88704 | 13.09 |
| 2026-02-15 12:00 | 18:07:33.60 | -19:11:27.4 | HIP 88828 | 13.65 |
| 2026-02-16 00:00 | 18:07:49.97 | -19:11:34.1 | HIP 88828 | 12.49 |
| 2026-02-16 12:00 | 18:08:06.23 | -19:11:40.6 | HIP 88828 | 12.46 |
| 2026-02-17 00:00 | 18:08:22.39 | -19:11:46.9 | HIP 88828 | 13.56 |
| 2026-02-17 12:00 | 18:08:38.45 | -19:11:53.2 | HIP 88828 | 15.53 |
| 2026-02-18 00:00 | 18:08:54.41 | -19:11:59.2 | HIP 88828 | 18.08 |
| 2026-02-18 12:00 | 18:09:10.26 | -19:12:05.2 | HIP 89061 | 20.88 |
| 2026-02-19 00:00 | 18:09:26.01 | -19:12:11.0 | HIP 89061 | 17.20 |
| 2026-02-19 12:00 | 18:09:41.65 | -19:12:16.7 | HIP 89061 | 13.55 |
| 2026-02-20 00:00 | 18:09:57.18 | -19:12:22.2 | HIP 89061 | 9.98 |
| 2026-02-20 12:00 | 18:10:12.61 | -19:12:27.7 | HIP 89061 | 6.53 |
| 2026-02-21 00:00 | 18:10:27.93 | -19:12:33.0 | HIP 89061 | 3.52 |
| 2026-02-21 12:00 | 18:10:43.14 | -19:12:38.2 | HIP 89061 | 2.87 |
| 2026-02-22 00:00 | 18:10:58.25 | -19:12:43.3 | HIP 89061 | 5.44 |
| 2026-02-22 12:00 | 18:11:13.24 | -19:12:48.2 | HIP 89061 | 8.72 |
| 2026-02-23 00:00 | 18:11:28.12 | -19:12:53.1 | HIP 89061 | 12.12 |
| 2026-02-23 12:00 | 18:11:42.89 | -19:12:57.9 | HIP 89203 | 15.01 |
| 2026-02-24 00:00 | 18:11:57.55 | -19:13:02.5 | HIP 89203 | 13.55 |