| 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) |
| 2026-09-25 00:00 |
16:26:07.91 |
+40:14:17.9 |
HIP 80590 |
24.54 |
| 2026-09-25 12:00 |
16:26:09.47 |
+40:13:37.5 |
HIP 80590 |
23.81 |
| 2026-09-26 00:00 |
16:26:11.06 |
+40:12:57.2 |
HIP 80590 |
23.07 |
| 2026-09-26 12:00 |
16:26:12.68 |
+40:12:17.0 |
HIP 80590 |
22.34 |
| 2026-09-27 00:00 |
16:26:14.33 |
+40:11:36.9 |
HIP 80590 |
21.61 |
| 2026-09-27 12:00 |
16:26:16.02 |
+40:10:57.0 |
HIP 80590 |
20.88 |
| 2026-09-28 00:00 |
16:26:17.72 |
+40:10:17.2 |
HIP 80590 |
20.14 |
| 2026-09-28 12:00 |
16:26:19.46 |
+40:09:37.6 |
HIP 80590 |
19.41 |
| 2026-09-29 00:00 |
16:26:21.23 |
+40:08:58.0 |
HIP 80590 |
18.67 |
| 2026-09-29 12:00 |
16:26:23.03 |
+40:08:18.6 |
HIP 80590 |
17.93 |
| 2026-09-30 00:00 |
16:26:24.85 |
+40:07:39.4 |
HIP 80590 |
17.19 |
| 2026-09-30 12:00 |
16:26:26.71 |
+40:07:00.3 |
HIP 80590 |
16.45 |
| 2026-10-01 00:00 |
16:26:28.59 |
+40:06:21.3 |
HIP 80590 |
15.72 |
| 2026-10-01 12:00 |
16:26:30.50 |
+40:05:42.5 |
HIP 80590 |
14.97 |
| 2026-10-02 00:00 |
16:26:32.44 |
+40:05:03.9 |
HIP 80590 |
14.23 |
| 2026-10-02 12:00 |
16:26:34.41 |
+40:04:25.4 |
HIP 80590 |
13.49 |
| 2026-10-03 00:00 |
16:26:36.40 |
+40:03:47.0 |
HIP 80590 |
12.75 |
| 2026-10-03 12:00 |
16:26:38.42 |
+40:03:08.8 |
HIP 80590 |
12.01 |
| 2026-10-04 00:00 |
16:26:40.47 |
+40:02:30.8 |
HIP 80590 |
11.26 |
| 2026-10-04 12:00 |
16:26:42.55 |
+40:01:52.9 |
HIP 80590 |
10.52 |
| 2026-10-05 00:00 |
16:26:44.66 |
+40:01:15.2 |
HIP 80590 |
9.77 |
| 2026-10-05 12:00 |
16:26:46.79 |
+40:00:37.7 |
HIP 80590 |
9.02 |
| 2026-10-06 00:00 |
16:26:48.95 |
+40:00:00.3 |
HIP 80590 |
8.28 |
| 2026-10-06 12:00 |
16:26:51.14 |
+39:59:23.2 |
HIP 80590 |
7.53 |
| 2026-10-07 00:00 |
16:26:53.35 |
+39:58:46.1 |
HIP 80590 |
6.78 |
| 2026-10-07 12:00 |
16:26:55.59 |
+39:58:09.3 |
HIP 80590 |
6.03 |
| 2026-10-08 00:00 |
16:26:57.86 |
+39:57:32.7 |
HIP 80590 |
5.28 |
| 2026-10-08 12:00 |
16:27:00.15 |
+39:56:56.2 |
HIP 80590 |
4.53 |
| 2026-10-09 00:00 |
16:27:02.47 |
+39:56:19.9 |
HIP 80590 |
3.78 |
| 2026-10-09 12:00 |
16:27:04.82 |
+39:55:43.8 |
HIP 80590 |
3.03 |
| 2026-10-10 00:00 |
16:27:07.19 |
+39:55:07.9 |
HIP 80590 |
2.28 |
| 2026-10-10 12:00 |
16:27:09.59 |
+39:54:32.2 |
HIP 80590 |
1.53 |
| 2026-10-11 00:00 |
16:27:12.01 |
+39:53:56.7 |
HIP 80590 |
0.78 |
| 2026-10-11 12:00 |
16:27:14.46 |
+39:53:21.4 |
HIP 80590 |
0.04 |
| 2026-10-12 00:00 |
16:27:16.93 |
+39:52:46.3 |
HIP 80590 |
0.73 |
| 2026-10-12 12:00 |
16:27:19.43 |
+39:52:11.4 |
HIP 80590 |
1.48 |
| 2026-10-13 00:00 |
16:27:21.95 |
+39:51:36.7 |
HIP 80590 |
2.24 |
| 2026-10-13 12:00 |
16:27:24.50 |
+39:51:02.3 |
HIP 80590 |
2.99 |
| 2026-10-14 00:00 |
16:27:27.07 |
+39:50:28.0 |
HIP 80590 |
3.75 |
| 2026-10-14 12:00 |
16:27:29.66 |
+39:49:53.9 |
HIP 80590 |
4.50 |
| 2026-10-15 00:00 |
16:27:32.28 |
+39:49:20.1 |
HIP 80590 |
5.26 |
| 2026-10-15 12:00 |
16:27:34.92 |
+39:48:46.5 |
HIP 80590 |
6.01 |
| 2026-10-16 00:00 |
16:27:37.59 |
+39:48:13.1 |
HIP 80590 |
6.77 |