C/2007 K6 (McNaught)
| 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
$$
M_a = (12.690 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.690 |
| n |
2.000 |
| gf |
0.958 |
| gb |
-0.832 |
| k |
0.999 |
| δ90 |
9.140 |
| 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) |
| 2026-02-03 00:00 |
12:01:54.84 |
+64:13:56.1 |
HIP 58860 |
17.57 |
| 2026-02-03 12:00 |
12:01:49.32 |
+64:14:34.7 |
HIP 58860 |
18.40 |
| 2026-02-04 00:00 |
12:01:43.76 |
+64:15:13.1 |
HIP 58860 |
19.24 |
| 2026-02-04 12:00 |
12:01:38.14 |
+64:15:51.3 |
HIP 58860 |
20.08 |
| 2026-02-05 00:00 |
12:01:32.48 |
+64:16:29.2 |
HIP 58860 |
20.94 |
| 2026-02-05 12:00 |
12:01:26.77 |
+64:17:06.9 |
HIP 58860 |
21.79 |
| 2026-02-06 00:00 |
12:01:21.01 |
+64:17:44.3 |
HIP 58860 |
22.65 |
| 2026-02-06 12:00 |
12:01:15.20 |
+64:18:21.4 |
HIP 58860 |
23.51 |
| 2026-02-07 00:00 |
12:01:09.35 |
+64:18:58.3 |
HIP 58860 |
24.38 |
| 2026-02-07 12:00 |
12:01:03.44 |
+64:19:34.9 |
HIP 58860 |
25.25 |
| 2026-02-08 00:00 |
12:00:57.50 |
+64:20:11.3 |
HIP 58860 |
26.12 |
| 2026-02-08 12:00 |
12:00:51.50 |
+64:20:47.4 |
HIP 58860 |
26.99 |
| 2026-02-09 00:00 |
12:00:45.47 |
+64:21:23.2 |
HIP 58860 |
27.87 |
| 2026-02-09 12:00 |
12:00:39.38 |
+64:21:58.8 |
HIP 58860 |
28.74 |
| 2026-02-10 00:00 |
12:00:33.26 |
+64:22:34.0 |
HIP 58860 |
29.62 |
| 2026-02-10 12:00 |
12:00:27.08 |
+64:23:09.0 |
HIP 58860 |
30.50 |
| 2026-02-11 00:00 |
12:00:20.87 |
+64:23:43.7 |
HIP 58860 |
31.38 |
| 2026-02-11 12:00 |
12:00:14.61 |
+64:24:18.1 |
HIP 58860 |
32.27 |
| 2026-02-12 00:00 |
12:00:08.31 |
+64:24:52.2 |
HIP 58650 |
32.90 |
| 2026-02-12 12:00 |
12:00:01.97 |
+64:25:26.1 |
HIP 58650 |
32.57 |
| 2026-02-13 00:00 |
11:59:55.58 |
+64:25:59.6 |
HIP 58650 |
32.26 |
| 2026-02-13 12:00 |
11:59:49.15 |
+64:26:32.8 |
HIP 58650 |
31.98 |
| 2026-02-14 00:00 |
11:59:42.69 |
+64:27:05.7 |
HIP 58650 |
31.73 |
| 2026-02-14 12:00 |
11:59:36.18 |
+64:27:38.3 |
HIP 58650 |
31.51 |
| 2026-02-15 00:00 |
11:59:29.63 |
+64:28:10.6 |
HIP 58650 |
31.31 |
| 2026-02-15 12:00 |
11:59:23.05 |
+64:28:42.6 |
HIP 58650 |
31.15 |
| 2026-02-16 00:00 |
11:59:16.42 |
+64:29:14.3 |
HIP 58650 |
31.02 |
| 2026-02-16 12:00 |
11:59:09.76 |
+64:29:45.6 |
HIP 58650 |
30.92 |
| 2026-02-17 00:00 |
11:59:03.06 |
+64:30:16.6 |
HIP 58650 |
30.85 |
| 2026-02-17 12:00 |
11:58:56.32 |
+64:30:47.3 |
HIP 58650 |
30.81 |
| 2026-02-18 00:00 |
11:58:49.55 |
+64:31:17.7 |
HIP 58650 |
30.81 |
| 2026-02-18 12:00 |
11:58:42.74 |
+64:31:47.7 |
HIP 58650 |
30.83 |
| 2026-02-19 00:00 |
11:58:35.90 |
+64:32:17.4 |
HIP 58650 |
30.89 |
| 2026-02-19 12:00 |
11:58:29.02 |
+64:32:46.8 |
HIP 58650 |
30.98 |
| 2026-02-20 00:00 |
11:58:22.11 |
+64:33:15.8 |
HIP 58650 |
31.10 |
| 2026-02-20 12:00 |
11:58:15.16 |
+64:33:44.5 |
HIP 58650 |
31.25 |
| 2026-02-21 00:00 |
11:58:08.18 |
+64:34:12.8 |
HIP 58650 |
31.43 |
| 2026-02-21 12:00 |
11:58:01.17 |
+64:34:40.8 |
HIP 58650 |
31.64 |
| 2026-02-22 00:00 |
11:57:54.13 |
+64:35:08.4 |
HIP 58650 |
31.88 |
| 2026-02-22 12:00 |
11:57:47.06 |
+64:35:35.7 |
HIP 58650 |
32.15 |
| 2026-02-23 00:00 |
11:57:39.96 |
+64:36:02.6 |
HIP 58650 |
32.45 |
| 2026-02-23 12:00 |
11:57:32.82 |
+64:36:29.2 |
HIP 58650 |
32.77 |
| 2026-02-24 00:00 |
11:57:25.66 |
+64:36:55.4 |
HIP 58650 |
33.12 |