C/2006 K3 (McNaught)
| Parameter |
Value |
| Designation |
C/2006 K3 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-03-13T08:54:02.200320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:57Z |
| Obs used |
205 |
| NEO |
- |
| M1 |
12.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-11-30.0000000 |
| e |
1.00079393 |
| q (au) |
2.501449 |
| a (au) |
-3150.724234 |
| i (deg) |
92.619997 |
| Ω (om, deg) |
49.402439 |
| ω (w, deg) |
328.077856 |
| M (ma, deg) |
-0.000576 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.835 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.835 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
| 2006-05-22 |
2007-03-09 |
-2.3577 |
+1.206 |
| 2007-07-25 |
2008-01-26 |
+22.6017 |
-11.094 |
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 |
16:41:00.15 |
+40:16:42.4 |
HIP 81609 |
32.98 |
| 2026-02-03 12:00 |
16:41:01.99 |
+40:17:15.9 |
HIP 81609 |
33.62 |
| 2026-02-04 00:00 |
16:41:03.79 |
+40:17:49.5 |
HIP 81609 |
34.26 |
| 2026-02-04 12:00 |
16:41:05.55 |
+40:18:23.4 |
HIP 81609 |
34.91 |
| 2026-02-05 00:00 |
16:41:07.29 |
+40:18:57.5 |
HIP 81609 |
35.55 |
| 2026-02-05 12:00 |
16:41:09.00 |
+40:19:31.7 |
HIP 81609 |
36.20 |
| 2026-02-06 00:00 |
16:41:10.67 |
+40:20:06.2 |
HIP 81609 |
36.85 |
| 2026-02-06 12:00 |
16:41:12.31 |
+40:20:40.8 |
HIP 81609 |
37.50 |
| 2026-02-07 00:00 |
16:41:13.92 |
+40:21:15.6 |
HIP 81888 |
38.04 |
| 2026-02-07 12:00 |
16:41:15.50 |
+40:21:50.6 |
HIP 81888 |
38.23 |
| 2026-02-08 00:00 |
16:41:17.04 |
+40:22:25.7 |
HIP 81888 |
38.43 |
| 2026-02-08 12:00 |
16:41:18.56 |
+40:23:01.0 |
HIP 81888 |
38.65 |
| 2026-02-09 00:00 |
16:41:20.03 |
+40:23:36.5 |
HIP 81888 |
38.89 |
| 2026-02-09 12:00 |
16:41:21.48 |
+40:24:12.2 |
HIP 81888 |
39.14 |
| 2026-02-10 00:00 |
16:41:22.90 |
+40:24:48.0 |
HIP 81888 |
39.40 |
| 2026-02-10 12:00 |
16:41:24.28 |
+40:25:24.0 |
HIP 81888 |
39.69 |
| 2026-02-11 00:00 |
16:41:25.62 |
+40:26:00.1 |
HIP 81888 |
39.99 |
| 2026-02-11 12:00 |
16:41:26.94 |
+40:26:36.4 |
HIP 81888 |
40.30 |
| 2026-02-12 00:00 |
16:41:28.22 |
+40:27:12.9 |
HIP 81888 |
40.62 |
| 2026-02-12 12:00 |
16:41:29.47 |
+40:27:49.5 |
HIP 81888 |
40.96 |
| 2026-02-13 00:00 |
16:41:30.68 |
+40:28:26.2 |
HIP 81888 |
41.32 |
| 2026-02-13 12:00 |
16:41:31.86 |
+40:29:03.1 |
HIP 82002 |
41.67 |
| 2026-02-14 00:00 |
16:41:33.00 |
+40:29:40.2 |
HIP 82002 |
41.32 |
| 2026-02-14 12:00 |
16:41:34.12 |
+40:30:17.3 |
HIP 82002 |
40.99 |
| 2026-02-15 00:00 |
16:41:35.19 |
+40:30:54.6 |
HIP 82002 |
40.67 |
| 2026-02-15 12:00 |
16:41:36.24 |
+40:31:32.1 |
HIP 82002 |
40.36 |
| 2026-02-16 00:00 |
16:41:37.24 |
+40:32:09.6 |
HIP 81774 |
40.03 |
| 2026-02-16 12:00 |
16:41:38.22 |
+40:32:47.3 |
HIP 81774 |
39.38 |
| 2026-02-17 00:00 |
16:41:39.15 |
+40:33:25.1 |
HIP 81774 |
38.73 |
| 2026-02-17 12:00 |
16:41:40.06 |
+40:34:03.1 |
HIP 81774 |
38.08 |
| 2026-02-18 00:00 |
16:41:40.93 |
+40:34:41.1 |
HIP 81774 |
37.43 |
| 2026-02-18 12:00 |
16:41:41.76 |
+40:35:19.3 |
HIP 81774 |
36.78 |
| 2026-02-19 00:00 |
16:41:42.56 |
+40:35:57.5 |
HIP 81774 |
36.12 |
| 2026-02-19 12:00 |
16:41:43.32 |
+40:36:35.9 |
HIP 81774 |
35.47 |
| 2026-02-20 00:00 |
16:41:44.05 |
+40:37:14.4 |
HIP 81774 |
34.82 |
| 2026-02-20 12:00 |
16:41:44.74 |
+40:37:52.9 |
HIP 81774 |
34.16 |
| 2026-02-21 00:00 |
16:41:45.40 |
+40:38:31.6 |
HIP 81774 |
33.50 |
| 2026-02-21 12:00 |
16:41:46.02 |
+40:39:10.4 |
HIP 81774 |
32.85 |
| 2026-02-22 00:00 |
16:41:46.61 |
+40:39:49.2 |
HIP 81774 |
32.19 |
| 2026-02-22 12:00 |
16:41:47.16 |
+40:40:28.1 |
HIP 81774 |
31.54 |
| 2026-02-23 00:00 |
16:41:47.67 |
+40:41:07.2 |
HIP 81774 |
30.88 |
| 2026-02-23 12:00 |
16:41:48.15 |
+40:41:46.2 |
HIP 81774 |
30.22 |
| 2026-02-24 00:00 |
16:41:48.60 |
+40:42:25.4 |
HIP 81774 |
29.56 |