| Parameter |
Value |
| Designation |
C/2007 K6 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-07-01T11:27:01.267200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:09Z |
| Obs used |
44 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-07-12.0000000 |
| e |
0.98462944 |
| q (au) |
3.432981 |
| a (au) |
223.347812 |
| i (deg) |
105.063716 |
| Ω (om, deg) |
298.075171 |
| ω (w, deg) |
337.140500 |
| M (ma, deg) |
0.003107 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.677 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.677 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.832 |
| k |
0.999 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
11:39:33.98 |
+62:38:32.0 |
HIP 56710 |
14.03 |
| 2026-07-29 12:00 |
11:39:37.75 |
+62:37:53.7 |
HIP 56710 |
14.65 |
| 2026-07-30 00:00 |
11:39:41.57 |
+62:37:15.6 |
HIP 56933 |
14.13 |
| 2026-07-30 12:00 |
11:39:45.42 |
+62:36:37.7 |
HIP 56933 |
13.40 |
| 2026-07-31 00:00 |
11:39:49.30 |
+62:36:00.0 |
HIP 56933 |
12.67 |
| 2026-07-31 12:00 |
11:39:53.22 |
+62:35:22.4 |
HIP 56933 |
11.95 |
| 2026-08-01 00:00 |
11:39:57.18 |
+62:34:45.0 |
HIP 56933 |
11.23 |
| 2026-08-01 12:00 |
11:40:01.17 |
+62:34:07.8 |
HIP 56933 |
10.53 |
| 2026-08-02 00:00 |
11:40:05.20 |
+62:33:30.8 |
HIP 56933 |
9.84 |
| 2026-08-02 12:00 |
11:40:09.26 |
+62:32:54.0 |
HIP 56933 |
9.17 |
| 2026-08-03 00:00 |
11:40:13.36 |
+62:32:17.3 |
HIP 56933 |
8.52 |
| 2026-08-03 12:00 |
11:40:17.49 |
+62:31:40.9 |
HIP 56933 |
7.89 |
| 2026-08-04 00:00 |
11:40:21.65 |
+62:31:04.6 |
HIP 56933 |
7.29 |
| 2026-08-04 12:00 |
11:40:25.85 |
+62:30:28.5 |
HIP 56933 |
6.73 |
| 2026-08-05 00:00 |
11:40:30.08 |
+62:29:52.7 |
HIP 56933 |
6.22 |
| 2026-08-05 12:00 |
11:40:34.34 |
+62:29:17.0 |
HIP 56933 |
5.78 |
| 2026-08-06 00:00 |
11:40:38.63 |
+62:28:41.5 |
HIP 56933 |
5.41 |
| 2026-08-06 12:00 |
11:40:42.96 |
+62:28:06.3 |
HIP 56933 |
5.14 |
| 2026-08-07 00:00 |
11:40:47.32 |
+62:27:31.2 |
HIP 56933 |
4.98 |
| 2026-08-07 12:00 |
11:40:51.71 |
+62:26:56.4 |
HIP 56933 |
4.94 |
| 2026-08-08 00:00 |
11:40:56.13 |
+62:26:21.8 |
HIP 56933 |
5.03 |
| 2026-08-08 12:00 |
11:41:00.59 |
+62:25:47.3 |
HIP 56933 |
5.24 |
| 2026-08-09 00:00 |
11:41:05.07 |
+62:25:13.1 |
HIP 56933 |
5.55 |
| 2026-08-09 12:00 |
11:41:09.58 |
+62:24:39.1 |
HIP 56933 |
5.95 |
| 2026-08-10 00:00 |
11:41:14.13 |
+62:24:05.4 |
HIP 56933 |
6.42 |
| 2026-08-10 12:00 |
11:41:18.70 |
+62:23:31.8 |
HIP 56933 |
6.95 |
| 2026-08-11 00:00 |
11:41:23.30 |
+62:22:58.5 |
HIP 56933 |
7.52 |
| 2026-08-11 12:00 |
11:41:27.94 |
+62:22:25.4 |
HIP 56933 |
8.13 |
| 2026-08-12 00:00 |
11:41:32.60 |
+62:21:52.6 |
HIP 56933 |
8.77 |
| 2026-08-12 12:00 |
11:41:37.29 |
+62:21:19.9 |
HIP 56933 |
9.43 |
| 2026-08-13 00:00 |
11:41:42.00 |
+62:20:47.6 |
HIP 56933 |
10.11 |
| 2026-08-13 12:00 |
11:41:46.75 |
+62:20:15.4 |
HIP 56933 |
10.80 |
| 2026-08-14 00:00 |
11:41:51.52 |
+62:19:43.5 |
HIP 56933 |
11.50 |
| 2026-08-14 12:00 |
11:41:56.32 |
+62:19:11.8 |
HIP 56933 |
12.21 |
| 2026-08-15 00:00 |
11:42:01.14 |
+62:18:40.4 |
HIP 56933 |
12.93 |
| 2026-08-15 12:00 |
11:42:05.99 |
+62:18:09.2 |
HIP 56933 |
13.66 |
| 2026-08-16 00:00 |
11:42:10.87 |
+62:17:38.2 |
HIP 56933 |
14.39 |
| 2026-08-16 12:00 |
11:42:15.77 |
+62:17:07.5 |
HIP 56933 |
15.13 |
| 2026-08-17 00:00 |
11:42:20.69 |
+62:16:37.1 |
HIP 56933 |
15.87 |
| 2026-08-17 12:00 |
11:42:25.65 |
+62:16:06.9 |
HIP 56933 |
16.61 |
| 2026-08-18 00:00 |
11:42:30.62 |
+62:15:36.9 |
HIP 56933 |
17.36 |
| 2026-08-18 12:00 |
11:42:35.62 |
+62:15:07.3 |
HIP 56933 |
18.10 |
| 2026-08-19 00:00 |
11:42:40.64 |
+62:14:37.8 |
HIP 56933 |
18.85 |