C/2006 L2 (McNaught)
| Parameter |
Value |
| Designation |
C/2006 L2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-11-20T04:47:09.041280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
400 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
7.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-09-29.0000000 |
| e |
1.00101694 |
| q (au) |
1.993947 |
| a (au) |
-1960.738221 |
| i (deg) |
101.022296 |
| Ω (om, deg) |
239.245982 |
| ω (w, deg) |
48.034913 |
| M (ma, deg) |
-0.000593 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.163 + 5.317\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.163 |
| n |
5.317 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.977 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2006-06-14 |
2006-10-14 |
+7.4648 |
-3.534 |
| 2006-12-02 |
2007-11-02 |
+6.0663 |
-2.640 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
03:44:56.67 |
-02:03:33.1 |
HIP 17438 |
13.52 |
| 2026-02-03 12:00 |
03:44:55.91 |
-02:03:21.0 |
HIP 17438 |
13.26 |
| 2026-02-04 00:00 |
03:44:55.17 |
-02:03:08.8 |
HIP 17438 |
13.01 |
| 2026-02-04 12:00 |
03:44:54.46 |
-02:02:56.4 |
HIP 17438 |
12.77 |
| 2026-02-05 00:00 |
03:44:53.77 |
-02:02:44.0 |
HIP 17438 |
12.54 |
| 2026-02-05 12:00 |
03:44:53.11 |
-02:02:31.5 |
HIP 17438 |
12.31 |
| 2026-02-06 00:00 |
03:44:52.47 |
-02:02:18.8 |
HIP 17438 |
12.09 |
| 2026-02-06 12:00 |
03:44:51.87 |
-02:02:06.1 |
HIP 17438 |
11.88 |
| 2026-02-07 00:00 |
03:44:51.28 |
-02:01:53.2 |
HIP 17438 |
11.67 |
| 2026-02-07 12:00 |
03:44:50.73 |
-02:01:40.2 |
HIP 17438 |
11.48 |
| 2026-02-08 00:00 |
03:44:50.20 |
-02:01:27.2 |
HIP 17438 |
11.29 |
| 2026-02-08 12:00 |
03:44:49.70 |
-02:01:14.0 |
HIP 17438 |
11.11 |
| 2026-02-09 00:00 |
03:44:49.22 |
-02:01:00.7 |
HIP 17438 |
10.93 |
| 2026-02-09 12:00 |
03:44:48.77 |
-02:00:47.4 |
HIP 17438 |
10.77 |
| 2026-02-10 00:00 |
03:44:48.35 |
-02:00:33.9 |
HIP 17438 |
10.62 |
| 2026-02-10 12:00 |
03:44:47.95 |
-02:00:20.3 |
HIP 17438 |
10.48 |
| 2026-02-11 00:00 |
03:44:47.58 |
-02:00:06.7 |
HIP 17438 |
10.34 |
| 2026-02-11 12:00 |
03:44:47.24 |
-01:59:52.9 |
HIP 17438 |
10.22 |
| 2026-02-12 00:00 |
03:44:46.92 |
-01:59:39.1 |
HIP 17438 |
10.11 |
| 2026-02-12 12:00 |
03:44:46.63 |
-01:59:25.1 |
HIP 17438 |
10.01 |
| 2026-02-13 00:00 |
03:44:46.37 |
-01:59:11.1 |
HIP 17438 |
9.92 |
| 2026-02-13 12:00 |
03:44:46.13 |
-01:58:57.0 |
HIP 17438 |
9.84 |
| 2026-02-14 00:00 |
03:44:45.92 |
-01:58:42.8 |
HIP 17438 |
9.78 |
| 2026-02-14 12:00 |
03:44:45.73 |
-01:58:28.5 |
HIP 17438 |
9.72 |
| 2026-02-15 00:00 |
03:44:45.57 |
-01:58:14.1 |
HIP 17438 |
9.68 |
| 2026-02-15 12:00 |
03:44:45.44 |
-01:57:59.7 |
HIP 17438 |
9.66 |
| 2026-02-16 00:00 |
03:44:45.34 |
-01:57:45.1 |
HIP 17438 |
9.64 |
| 2026-02-16 12:00 |
03:44:45.26 |
-01:57:30.5 |
HIP 17438 |
9.64 |
| 2026-02-17 00:00 |
03:44:45.21 |
-01:57:15.8 |
HIP 17438 |
9.65 |
| 2026-02-17 12:00 |
03:44:45.18 |
-01:57:01.0 |
HIP 17438 |
9.67 |
| 2026-02-18 00:00 |
03:44:45.19 |
-01:56:46.2 |
HIP 17438 |
9.71 |
| 2026-02-18 12:00 |
03:44:45.21 |
-01:56:31.2 |
HIP 17438 |
9.76 |
| 2026-02-19 00:00 |
03:44:45.27 |
-01:56:16.2 |
HIP 17438 |
9.82 |
| 2026-02-19 12:00 |
03:44:45.35 |
-01:56:01.2 |
HIP 17438 |
9.89 |
| 2026-02-20 00:00 |
03:44:45.46 |
-01:55:46.0 |
HIP 17438 |
9.98 |
| 2026-02-20 12:00 |
03:44:45.59 |
-01:55:30.8 |
HIP 17438 |
10.08 |
| 2026-02-21 00:00 |
03:44:45.75 |
-01:55:15.5 |
HIP 17438 |
10.19 |
| 2026-02-21 12:00 |
03:44:45.93 |
-01:55:00.2 |
HIP 17438 |
10.32 |
| 2026-02-22 00:00 |
03:44:46.15 |
-01:54:44.8 |
HIP 17438 |
10.45 |
| 2026-02-22 12:00 |
03:44:46.38 |
-01:54:29.3 |
HIP 17438 |
10.60 |
| 2026-02-23 00:00 |
03:44:46.65 |
-01:54:13.8 |
HIP 17438 |
10.75 |
| 2026-02-23 12:00 |
03:44:46.94 |
-01:53:58.2 |
HIP 17438 |
10.92 |
| 2026-02-24 00:00 |
03:44:47.26 |
-01:53:42.6 |
HIP 17438 |
11.10 |