| Parameter |
Value |
| Designation |
C/2006 K1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-07-20T13:20:54.202560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:57Z |
| Obs used |
415 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-09-22.0000000 |
| e |
1.00160448 |
| q (au) |
4.425528 |
| a (au) |
-2758.226517 |
| i (deg) |
53.876740 |
| Ω (om, deg) |
72.115378 |
| ω (w, deg) |
296.442521 |
| M (ma, deg) |
0.000432 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.837 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.837 |
| n |
2.000 |
| gf |
0.971 |
| gb |
-0.939 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:27:55.12 |
+60:29:31.2 |
HIP 55698 |
33.64 |
| 2026-09-20 12:00 |
11:28:01.53 |
+60:29:24.5 |
HIP 55698 |
34.27 |
| 2026-09-21 00:00 |
11:28:07.92 |
+60:29:18.1 |
HIP 55698 |
34.90 |
| 2026-09-21 12:00 |
11:28:14.32 |
+60:29:12.0 |
HIP 55698 |
35.53 |
| 2026-09-22 00:00 |
11:28:20.70 |
+60:29:06.3 |
HIP 56348 |
35.83 |
| 2026-09-22 12:00 |
11:28:27.08 |
+60:29:00.9 |
HIP 56348 |
35.10 |
| 2026-09-23 00:00 |
11:28:33.46 |
+60:28:55.9 |
HIP 56348 |
34.36 |
| 2026-09-23 12:00 |
11:28:39.82 |
+60:28:51.2 |
HIP 56348 |
33.63 |
| 2026-09-24 00:00 |
11:28:46.18 |
+60:28:46.8 |
HIP 56348 |
32.90 |
| 2026-09-24 12:00 |
11:28:52.53 |
+60:28:42.7 |
HIP 56348 |
32.17 |
| 2026-09-25 00:00 |
11:28:58.87 |
+60:28:39.0 |
HIP 56348 |
31.44 |
| 2026-09-25 12:00 |
11:29:05.20 |
+60:28:35.6 |
HIP 56348 |
30.72 |
| 2026-09-26 00:00 |
11:29:11.53 |
+60:28:32.6 |
HIP 56348 |
29.99 |
| 2026-09-26 12:00 |
11:29:17.84 |
+60:28:29.8 |
HIP 56348 |
29.27 |
| 2026-09-27 00:00 |
11:29:24.15 |
+60:28:27.5 |
HIP 56348 |
28.55 |
| 2026-09-27 12:00 |
11:29:30.44 |
+60:28:25.4 |
HIP 56348 |
27.84 |
| 2026-09-28 00:00 |
11:29:36.72 |
+60:28:23.7 |
HIP 56348 |
27.12 |
| 2026-09-28 12:00 |
11:29:43.00 |
+60:28:22.3 |
HIP 56348 |
26.41 |
| 2026-09-29 00:00 |
11:29:49.26 |
+60:28:21.3 |
HIP 56348 |
25.70 |
| 2026-09-29 12:00 |
11:29:55.51 |
+60:28:20.6 |
HIP 56348 |
24.99 |
| 2026-09-30 00:00 |
11:30:01.75 |
+60:28:20.2 |
HIP 56348 |
24.29 |
| 2026-09-30 12:00 |
11:30:07.98 |
+60:28:20.2 |
HIP 56348 |
23.59 |
| 2026-10-01 00:00 |
11:30:14.19 |
+60:28:20.5 |
HIP 56348 |
22.89 |
| 2026-10-01 12:00 |
11:30:20.40 |
+60:28:21.2 |
HIP 56348 |
22.19 |
| 2026-10-02 00:00 |
11:30:26.58 |
+60:28:22.2 |
HIP 56348 |
21.50 |
| 2026-10-02 12:00 |
11:30:32.76 |
+60:28:23.5 |
HIP 56348 |
20.81 |
| 2026-10-03 00:00 |
11:30:38.92 |
+60:28:25.2 |
HIP 56348 |
20.13 |
| 2026-10-03 12:00 |
11:30:45.07 |
+60:28:27.2 |
HIP 56348 |
19.45 |
| 2026-10-04 00:00 |
11:30:51.20 |
+60:28:29.5 |
HIP 56348 |
18.78 |
| 2026-10-04 12:00 |
11:30:57.32 |
+60:28:32.2 |
HIP 56348 |
18.11 |
| 2026-10-05 00:00 |
11:31:03.43 |
+60:28:35.2 |
HIP 56348 |
17.44 |
| 2026-10-05 12:00 |
11:31:09.51 |
+60:28:38.6 |
HIP 56348 |
16.78 |
| 2026-10-06 00:00 |
11:31:15.58 |
+60:28:42.3 |
HIP 56348 |
16.13 |
| 2026-10-06 12:00 |
11:31:21.64 |
+60:28:46.4 |
HIP 56348 |
15.48 |
| 2026-10-07 00:00 |
11:31:27.68 |
+60:28:50.8 |
HIP 56348 |
14.85 |
| 2026-10-07 12:00 |
11:31:33.70 |
+60:28:55.5 |
HIP 56348 |
14.22 |
| 2026-10-08 00:00 |
11:31:39.70 |
+60:29:00.6 |
HIP 56348 |
13.60 |
| 2026-10-08 12:00 |
11:31:45.69 |
+60:29:06.1 |
HIP 56348 |
12.99 |
| 2026-10-09 00:00 |
11:31:51.66 |
+60:29:11.8 |
HIP 56348 |
12.39 |
| 2026-10-09 12:00 |
11:31:57.61 |
+60:29:17.9 |
HIP 56348 |
11.81 |
| 2026-10-10 00:00 |
11:32:03.54 |
+60:29:24.4 |
HIP 56348 |
11.24 |
| 2026-10-10 12:00 |
11:32:09.45 |
+60:29:31.2 |
HIP 56348 |
10.69 |
| 2026-10-11 00:00 |
11:32:15.34 |
+60:29:38.3 |
HIP 56348 |
10.16 |