| 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
$$
M_a = (9.839 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.839 |
| n |
2.000 |
| gf |
0.989 |
| gb |
-0.939 |
| k |
1.000 |
| δ90 |
9.785 |
| 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) |
| 2026-05-12 00:00 |
11:13:05.66 |
+62:52:38.8 |
HIP 54555 |
23.45 |
| 2026-05-12 12:00 |
11:13:03.30 |
+62:52:05.1 |
HIP 54555 |
23.36 |
| 2026-05-13 00:00 |
11:13:00.99 |
+62:51:31.2 |
HIP 54555 |
23.29 |
| 2026-05-13 12:00 |
11:12:58.74 |
+62:50:57.0 |
HIP 54555 |
23.24 |
| 2026-05-14 00:00 |
11:12:56.54 |
+62:50:22.7 |
HIP 54555 |
23.22 |
| 2026-05-14 12:00 |
11:12:54.39 |
+62:49:48.1 |
HIP 54555 |
23.23 |
| 2026-05-15 00:00 |
11:12:52.29 |
+62:49:13.4 |
HIP 54555 |
23.25 |
| 2026-05-15 12:00 |
11:12:50.25 |
+62:48:38.4 |
HIP 54555 |
23.30 |
| 2026-05-16 00:00 |
11:12:48.27 |
+62:48:03.2 |
HIP 54555 |
23.38 |
| 2026-05-16 12:00 |
11:12:46.33 |
+62:47:27.8 |
HIP 54555 |
23.47 |
| 2026-05-17 00:00 |
11:12:44.45 |
+62:46:52.2 |
HIP 54555 |
23.59 |
| 2026-05-17 12:00 |
11:12:42.63 |
+62:46:16.4 |
HIP 54555 |
23.74 |
| 2026-05-18 00:00 |
11:12:40.86 |
+62:45:40.5 |
HIP 54555 |
23.90 |
| 2026-05-18 12:00 |
11:12:39.14 |
+62:45:04.3 |
HIP 54555 |
24.09 |
| 2026-05-19 00:00 |
11:12:37.48 |
+62:44:27.9 |
HIP 54555 |
24.30 |
| 2026-05-19 12:00 |
11:12:35.87 |
+62:43:51.4 |
HIP 54555 |
24.53 |
| 2026-05-20 00:00 |
11:12:34.32 |
+62:43:14.7 |
HIP 54555 |
24.79 |
| 2026-05-20 12:00 |
11:12:32.82 |
+62:42:37.8 |
HIP 54555 |
25.06 |
| 2026-05-21 00:00 |
11:12:31.37 |
+62:42:00.7 |
HIP 54555 |
25.35 |
| 2026-05-21 12:00 |
11:12:29.98 |
+62:41:23.4 |
HIP 54514 |
25.43 |
| 2026-05-22 00:00 |
11:12:28.65 |
+62:40:46.0 |
HIP 54514 |
25.02 |
| 2026-05-22 12:00 |
11:12:27.37 |
+62:40:08.4 |
HIP 54514 |
24.62 |
| 2026-05-23 00:00 |
11:12:26.14 |
+62:39:30.7 |
HIP 54514 |
24.24 |
| 2026-05-23 12:00 |
11:12:24.97 |
+62:38:52.8 |
HIP 54514 |
23.87 |
| 2026-05-24 00:00 |
11:12:23.85 |
+62:38:14.7 |
HIP 54514 |
23.52 |
| 2026-05-24 12:00 |
11:12:22.79 |
+62:37:36.5 |
HIP 54514 |
23.19 |
| 2026-05-25 00:00 |
11:12:21.78 |
+62:36:58.1 |
HIP 54514 |
22.88 |
| 2026-05-25 12:00 |
11:12:20.82 |
+62:36:19.6 |
HIP 54514 |
22.58 |
| 2026-05-26 00:00 |
11:12:19.92 |
+62:35:41.0 |
HIP 54514 |
22.31 |
| 2026-05-26 12:00 |
11:12:19.08 |
+62:35:02.2 |
HIP 54869 |
21.84 |
| 2026-05-27 00:00 |
11:12:18.29 |
+62:34:23.2 |
HIP 54869 |
21.36 |
| 2026-05-27 12:00 |
11:12:17.55 |
+62:33:44.1 |
HIP 54869 |
20.88 |
| 2026-05-28 00:00 |
11:12:16.87 |
+62:33:04.9 |
HIP 54869 |
20.41 |
| 2026-05-28 12:00 |
11:12:16.24 |
+62:32:25.5 |
HIP 54869 |
19.94 |
| 2026-05-29 00:00 |
11:12:15.66 |
+62:31:46.1 |
HIP 54869 |
19.48 |
| 2026-05-29 12:00 |
11:12:15.14 |
+62:31:06.5 |
HIP 54869 |
19.02 |
| 2026-05-30 00:00 |
11:12:14.68 |
+62:30:26.7 |
HIP 54869 |
18.57 |
| 2026-05-30 12:00 |
11:12:14.27 |
+62:29:46.9 |
HIP 54869 |
18.13 |
| 2026-05-31 00:00 |
11:12:13.91 |
+62:29:06.9 |
HIP 54869 |
17.70 |
| 2026-05-31 12:00 |
11:12:13.61 |
+62:28:26.8 |
HIP 54869 |
17.27 |
| 2026-06-01 00:00 |
11:12:13.36 |
+62:27:46.6 |
HIP 54869 |
16.86 |
| 2026-06-01 12:00 |
11:12:13.16 |
+62:27:06.3 |
HIP 54869 |
16.45 |
| 2026-06-02 00:00 |
11:12:13.02 |
+62:26:25.9 |
HIP 54869 |
16.06 |