| 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) |
| 2026-09-20 00:00 |
11:48:34.33 |
+61:53:17.3 |
HIP 57865 |
27.39 |
| 2026-09-20 12:00 |
11:48:40.10 |
+61:53:07.7 |
HIP 57865 |
26.70 |
| 2026-09-21 00:00 |
11:48:45.86 |
+61:52:58.4 |
HIP 57865 |
26.02 |
| 2026-09-21 12:00 |
11:48:51.63 |
+61:52:49.5 |
HIP 57865 |
25.33 |
| 2026-09-22 00:00 |
11:48:57.39 |
+61:52:40.9 |
HIP 57865 |
24.65 |
| 2026-09-22 12:00 |
11:49:03.15 |
+61:52:32.7 |
HIP 57865 |
23.98 |
| 2026-09-23 00:00 |
11:49:08.91 |
+61:52:24.8 |
HIP 57865 |
23.31 |
| 2026-09-23 12:00 |
11:49:14.67 |
+61:52:17.2 |
HIP 57865 |
22.64 |
| 2026-09-24 00:00 |
11:49:20.42 |
+61:52:10.0 |
HIP 57865 |
21.97 |
| 2026-09-24 12:00 |
11:49:26.17 |
+61:52:03.2 |
HIP 57865 |
21.31 |
| 2026-09-25 00:00 |
11:49:31.91 |
+61:51:56.7 |
HIP 57865 |
20.66 |
| 2026-09-25 12:00 |
11:49:37.65 |
+61:51:50.5 |
HIP 57865 |
20.01 |
| 2026-09-26 00:00 |
11:49:43.39 |
+61:51:44.7 |
HIP 57865 |
19.37 |
| 2026-09-26 12:00 |
11:49:49.12 |
+61:51:39.2 |
HIP 57865 |
18.73 |
| 2026-09-27 00:00 |
11:49:54.84 |
+61:51:34.1 |
HIP 57865 |
18.10 |
| 2026-09-27 12:00 |
11:50:00.56 |
+61:51:29.3 |
HIP 57865 |
17.47 |
| 2026-09-28 00:00 |
11:50:06.27 |
+61:51:24.9 |
HIP 57865 |
16.86 |
| 2026-09-28 12:00 |
11:50:11.98 |
+61:51:20.8 |
HIP 57865 |
16.25 |
| 2026-09-29 00:00 |
11:50:17.68 |
+61:51:17.1 |
HIP 57865 |
15.65 |
| 2026-09-29 12:00 |
11:50:23.37 |
+61:51:13.7 |
HIP 57865 |
15.07 |
| 2026-09-30 00:00 |
11:50:29.06 |
+61:51:10.7 |
HIP 57865 |
14.49 |
| 2026-09-30 12:00 |
11:50:34.73 |
+61:51:08.0 |
HIP 57865 |
13.93 |
| 2026-10-01 00:00 |
11:50:40.40 |
+61:51:05.7 |
HIP 57865 |
13.38 |
| 2026-10-01 12:00 |
11:50:46.06 |
+61:51:03.7 |
HIP 57865 |
12.85 |
| 2026-10-02 00:00 |
11:50:51.71 |
+61:51:02.1 |
HIP 57865 |
12.34 |
| 2026-10-02 12:00 |
11:50:57.35 |
+61:51:00.9 |
HIP 57865 |
11.85 |
| 2026-10-03 00:00 |
11:51:02.98 |
+61:51:00.0 |
HIP 57865 |
11.38 |
| 2026-10-03 12:00 |
11:51:08.61 |
+61:50:59.4 |
HIP 57865 |
10.94 |
| 2026-10-04 00:00 |
11:51:14.22 |
+61:50:59.2 |
HIP 57865 |
10.53 |
| 2026-10-04 12:00 |
11:51:19.82 |
+61:50:59.4 |
HIP 57865 |
10.15 |
| 2026-10-05 00:00 |
11:51:25.40 |
+61:51:00.0 |
HIP 57865 |
9.80 |
| 2026-10-05 12:00 |
11:51:30.98 |
+61:51:00.8 |
HIP 57865 |
9.50 |
| 2026-10-06 00:00 |
11:51:36.54 |
+61:51:02.1 |
HIP 57865 |
9.23 |
| 2026-10-06 12:00 |
11:51:42.10 |
+61:51:03.6 |
HIP 57865 |
9.02 |
| 2026-10-07 00:00 |
11:51:47.63 |
+61:51:05.6 |
HIP 57865 |
8.85 |
| 2026-10-07 12:00 |
11:51:53.16 |
+61:51:07.9 |
HIP 57865 |
8.74 |
| 2026-10-08 00:00 |
11:51:58.67 |
+61:51:10.6 |
HIP 57865 |
8.68 |
| 2026-10-08 12:00 |
11:52:04.17 |
+61:51:13.6 |
HIP 57865 |
8.67 |
| 2026-10-09 00:00 |
11:52:09.65 |
+61:51:17.0 |
HIP 57865 |
8.72 |
| 2026-10-09 12:00 |
11:52:15.12 |
+61:51:20.8 |
HIP 57865 |
8.82 |
| 2026-10-10 00:00 |
11:52:20.57 |
+61:51:24.9 |
HIP 57865 |
8.98 |
| 2026-10-10 12:00 |
11:52:26.01 |
+61:51:29.4 |
HIP 57865 |
9.18 |
| 2026-10-11 00:00 |
11:52:31.43 |
+61:51:34.2 |
HIP 57865 |
9.43 |