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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 16:54:28.06 | -53:57:07.9 | HIP 82622 | 21.52 |
| 2026-07-29 12:00 | 16:54:25.03 | -53:56:46.9 | HIP 82622 | 21.65 |
| 2026-07-30 00:00 | 16:54:22.03 | -53:56:25.7 | HIP 82622 | 21.80 |
| 2026-07-30 12:00 | 16:54:19.07 | -53:56:04.5 | HIP 82622 | 21.97 |
| 2026-07-31 00:00 | 16:54:16.14 | -53:55:43.2 | HIP 82622 | 22.15 |
| 2026-07-31 12:00 | 16:54:13.25 | -53:55:21.8 | HIP 82622 | 22.35 |
| 2026-08-01 00:00 | 16:54:10.39 | -53:55:00.3 | HIP 82622 | 22.57 |
| 2026-08-01 12:00 | 16:54:07.56 | -53:54:38.8 | HIP 82622 | 22.80 |
| 2026-08-02 00:00 | 16:54:04.77 | -53:54:17.1 | HIP 82622 | 23.04 |
| 2026-08-02 12:00 | 16:54:02.02 | -53:53:55.4 | HIP 82622 | 23.29 |
| 2026-08-03 00:00 | 16:53:59.30 | -53:53:33.6 | HIP 82622 | 23.56 |
| 2026-08-03 12:00 | 16:53:56.62 | -53:53:11.8 | HIP 82622 | 23.84 |
| 2026-08-04 00:00 | 16:53:53.98 | -53:52:49.8 | HIP 82622 | 24.12 |
| 2026-08-04 12:00 | 16:53:51.37 | -53:52:27.8 | HIP 82622 | 24.42 |
| 2026-08-05 00:00 | 16:53:48.80 | -53:52:05.7 | HIP 82622 | 24.73 |
| 2026-08-05 12:00 | 16:53:46.26 | -53:51:43.6 | HIP 82622 | 25.05 |
| 2026-08-06 00:00 | 16:53:43.76 | -53:51:21.3 | HIP 82622 | 25.38 |
| 2026-08-06 12:00 | 16:53:41.30 | -53:50:59.0 | HIP 82622 | 25.71 |
| 2026-08-07 00:00 | 16:53:38.87 | -53:50:36.7 | HIP 82622 | 26.05 |
| 2026-08-07 12:00 | 16:53:36.49 | -53:50:14.3 | HIP 82622 | 26.40 |
| 2026-08-08 00:00 | 16:53:34.14 | -53:49:51.8 | HIP 82622 | 26.75 |
| 2026-08-08 12:00 | 16:53:31.82 | -53:49:29.3 | HIP 82622 | 27.12 |
| 2026-08-09 00:00 | 16:53:29.55 | -53:49:06.7 | HIP 82622 | 27.48 |
| 2026-08-09 12:00 | 16:53:27.31 | -53:48:44.0 | HIP 82622 | 27.85 |
| 2026-08-10 00:00 | 16:53:25.12 | -53:48:21.3 | HIP 82622 | 28.23 |
| 2026-08-10 12:00 | 16:53:22.96 | -53:47:58.6 | HIP 82622 | 28.61 |
| 2026-08-11 00:00 | 16:53:20.83 | -53:47:35.8 | HIP 82622 | 29.00 |
| 2026-08-11 12:00 | 16:53:18.75 | -53:47:12.9 | HIP 82622 | 29.39 |
| 2026-08-12 00:00 | 16:53:16.71 | -53:46:50.1 | HIP 82622 | 29.78 |
| 2026-08-12 12:00 | 16:53:14.71 | -53:46:27.1 | HIP 82622 | 30.17 |
| 2026-08-13 00:00 | 16:53:12.74 | -53:46:04.1 | HIP 82365 | 30.42 |
| 2026-08-13 12:00 | 16:53:10.81 | -53:45:41.1 | HIP 82365 | 30.11 |
| 2026-08-14 00:00 | 16:53:08.93 | -53:45:18.1 | HIP 82365 | 29.80 |
| 2026-08-14 12:00 | 16:53:07.08 | -53:44:55.0 | HIP 82365 | 29.51 |
| 2026-08-15 00:00 | 16:53:05.27 | -53:44:31.9 | HIP 82365 | 29.23 |
| 2026-08-15 12:00 | 16:53:03.51 | -53:44:08.7 | HIP 82365 | 28.95 |
| 2026-08-16 00:00 | 16:53:01.78 | -53:43:45.5 | HIP 82365 | 28.69 |
| 2026-08-16 12:00 | 16:53:00.09 | -53:43:22.3 | HIP 82365 | 28.44 |
| 2026-08-17 00:00 | 16:52:58.44 | -53:42:59.1 | HIP 82365 | 28.20 |
| 2026-08-17 12:00 | 16:52:56.84 | -53:42:35.8 | HIP 82365 | 27.98 |
| 2026-08-18 00:00 | 16:52:55.27 | -53:42:12.5 | HIP 82365 | 27.76 |
| 2026-08-18 12:00 | 16:52:53.74 | -53:41:49.2 | HIP 82365 | 27.56 |
| 2026-08-19 00:00 | 16:52:52.25 | -53:41:25.9 | HIP 82365 | 27.36 |