C/2006 P1 (McNaught)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2006 P1 (McNaught) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2007-01-12T19:10:20.087040Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:59Z |
| Obs used | 331 |
| NEO | - |
| M1 | 5.400 |
| K1 | 20.750 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2006-11-26.0000000 |
| e | 1.00001882 |
| q (au) | 0.170736 |
| a (au) | -9074.061069 |
| i (deg) | 77.837001 |
| Ω (om, deg) | 267.414803 |
| ω (w, deg) | 155.974968 |
| M (ma, deg) | -0.000055 |
Magnitude
Scatter + Global Linear
$$ M_a = (6.650 + 5.259\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 6.650 |
| n | 5.259 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2006-08-07 | 2006-10-09 | +16.8994 | -5.727 |
| 2006-10-09 | 2006-12-24 | +2.3930 | -1.220 |
| 2006-12-24 | 2007-01-09 | -3.1120 | -1.827 |
| 2007-01-09 | 2007-01-12 | -0.3863 | +0.233 |
| 2007-01-12 | 2007-07-11 | -2.7439 | -1.992 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 17:02:58.71 | -54:21:11.6 | HIP 83402 | 12.65 |
| 2026-06-01 12:00 | 17:02:53.72 | -54:21:10.0 | HIP 83402 | 12.58 |
| 2026-06-02 00:00 | 17:02:48.73 | -54:21:08.2 | HIP 83402 | 12.55 |
| 2026-06-02 12:00 | 17:02:43.74 | -54:21:06.1 | HIP 83402 | 12.57 |
| 2026-06-03 00:00 | 17:02:38.74 | -54:21:03.9 | HIP 83402 | 12.63 |
| 2026-06-03 12:00 | 17:02:33.74 | -54:21:01.5 | HIP 83352 | 12.55 |
| 2026-06-04 00:00 | 17:02:28.74 | -54:20:58.8 | HIP 83352 | 12.30 |
| 2026-06-04 12:00 | 17:02:23.73 | -54:20:55.9 | HIP 83352 | 12.08 |
| 2026-06-05 00:00 | 17:02:18.72 | -54:20:52.8 | HIP 83352 | 11.91 |
| 2026-06-05 12:00 | 17:02:13.71 | -54:20:49.5 | HIP 83352 | 11.77 |
| 2026-06-06 00:00 | 17:02:08.70 | -54:20:46.0 | HIP 83352 | 11.67 |
| 2026-06-06 12:00 | 17:02:03.68 | -54:20:42.3 | HIP 83352 | 11.61 |
| 2026-06-07 00:00 | 17:01:58.67 | -54:20:38.4 | HIP 83352 | 11.60 |
| 2026-06-07 12:00 | 17:01:53.66 | -54:20:34.3 | HIP 83352 | 11.63 |
| 2026-06-08 00:00 | 17:01:48.64 | -54:20:29.9 | HIP 83352 | 11.70 |
| 2026-06-08 12:00 | 17:01:43.63 | -54:20:25.4 | HIP 83352 | 11.81 |
| 2026-06-09 00:00 | 17:01:38.62 | -54:20:20.6 | HIP 83352 | 11.97 |
| 2026-06-09 12:00 | 17:01:33.61 | -54:20:15.7 | HIP 83352 | 12.16 |
| 2026-06-10 00:00 | 17:01:28.60 | -54:20:10.5 | HIP 83352 | 12.40 |
| 2026-06-10 12:00 | 17:01:23.60 | -54:20:05.1 | HIP 83352 | 12.66 |
| 2026-06-11 00:00 | 17:01:18.59 | -54:19:59.5 | HIP 83352 | 12.97 |
| 2026-06-11 12:00 | 17:01:13.59 | -54:19:53.7 | HIP 83352 | 13.30 |
| 2026-06-12 00:00 | 17:01:08.59 | -54:19:47.7 | HIP 83352 | 13.66 |
| 2026-06-12 12:00 | 17:01:03.60 | -54:19:41.5 | HIP 83352 | 14.05 |
| 2026-06-13 00:00 | 17:00:58.61 | -54:19:35.1 | HIP 83352 | 14.46 |
| 2026-06-13 12:00 | 17:00:53.63 | -54:19:28.4 | HIP 83352 | 14.89 |
| 2026-06-14 00:00 | 17:00:48.65 | -54:19:21.6 | HIP 83352 | 15.35 |
| 2026-06-14 12:00 | 17:00:43.68 | -54:19:14.6 | HIP 83352 | 15.82 |
| 2026-06-15 00:00 | 17:00:38.71 | -54:19:07.3 | HIP 83352 | 16.31 |
| 2026-06-15 12:00 | 17:00:33.75 | -54:19:00.0 | HIP 83352 | 16.81 |
| 2026-06-16 00:00 | 17:00:28.79 | -54:18:52.3 | HIP 83187 | 17.26 |
| 2026-06-16 12:00 | 17:00:23.85 | -54:18:44.4 | HIP 83187 | 17.27 |
| 2026-06-17 00:00 | 17:00:18.91 | -54:18:36.4 | HIP 83187 | 17.31 |
| 2026-06-17 12:00 | 17:00:13.98 | -54:18:28.1 | HIP 83187 | 17.39 |
| 2026-06-18 00:00 | 17:00:09.06 | -54:18:19.7 | HIP 83187 | 17.50 |
| 2026-06-18 12:00 | 17:00:04.14 | -54:18:11.0 | HIP 83187 | 17.64 |
| 2026-06-19 00:00 | 16:59:59.24 | -54:18:02.2 | HIP 83187 | 17.81 |
| 2026-06-19 12:00 | 16:59:54.34 | -54:17:53.1 | HIP 83187 | 18.02 |
| 2026-06-20 00:00 | 16:59:49.46 | -54:17:43.9 | HIP 83187 | 18.25 |
| 2026-06-20 12:00 | 16:59:44.59 | -54:17:34.5 | HIP 83187 | 18.52 |
| 2026-06-21 00:00 | 16:59:39.73 | -54:17:24.8 | HIP 83187 | 18.81 |
| 2026-06-21 12:00 | 16:59:34.87 | -54:17:15.0 | HIP 83187 | 19.12 |
| 2026-06-22 00:00 | 16:59:30.04 | -54:17:05.0 | HIP 83187 | 19.46 |