C/2006 K4 (NEAT)
| Parameter |
Value |
| Designation |
C/2006 K4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-11-29T07:13:52.665600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
470 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-06-04.0000000 |
| e |
0.99824946 |
| q (au) |
3.188616 |
| a (au) |
1821.503573 |
| i (deg) |
111.333754 |
| Ω (om, deg) |
116.596913 |
| ω (w, deg) |
233.604103 |
| M (ma, deg) |
359.997739 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.478 + 2.073\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.478 |
| n |
2.073 |
| gf |
1.000 |
| gb |
-0.678 |
| k |
0.800 |
| δ90 |
9.960 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2006-05-18 |
2007-09-08 |
+1.1887 |
-1.214 |
| 2008-01-26 |
2009-11-20 |
+0.0139 |
-0.066 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:34:10.39 |
+40:08:18.5 |
HIP 36906 |
25.38 |
| 2026-02-03 12:00 |
07:34:06.23 |
+40:08:23.0 |
HIP 36906 |
25.72 |
| 2026-02-04 00:00 |
07:34:02.07 |
+40:08:27.4 |
HIP 36906 |
26.08 |
| 2026-02-04 12:00 |
07:33:57.94 |
+40:08:31.6 |
HIP 36906 |
26.46 |
| 2026-02-05 00:00 |
07:33:53.82 |
+40:08:35.6 |
HIP 36906 |
26.85 |
| 2026-02-05 12:00 |
07:33:49.71 |
+40:08:39.4 |
HIP 36906 |
27.26 |
| 2026-02-06 00:00 |
07:33:45.63 |
+40:08:43.1 |
HIP 36906 |
27.69 |
| 2026-02-06 12:00 |
07:33:41.56 |
+40:08:46.6 |
HIP 36906 |
28.14 |
| 2026-02-07 00:00 |
07:33:37.51 |
+40:08:50.0 |
HIP 36906 |
28.60 |
| 2026-02-07 12:00 |
07:33:33.48 |
+40:08:53.2 |
HIP 36906 |
29.07 |
| 2026-02-08 00:00 |
07:33:29.46 |
+40:08:56.2 |
HIP 36906 |
29.55 |
| 2026-02-08 12:00 |
07:33:25.47 |
+40:08:59.0 |
HIP 36906 |
30.05 |
| 2026-02-09 00:00 |
07:33:21.49 |
+40:09:01.7 |
HIP 36906 |
30.55 |
| 2026-02-09 12:00 |
07:33:17.53 |
+40:09:04.2 |
HIP 36906 |
31.07 |
| 2026-02-10 00:00 |
07:33:13.59 |
+40:09:06.6 |
HIP 36533 |
31.46 |
| 2026-02-10 12:00 |
07:33:09.68 |
+40:09:08.8 |
HIP 36533 |
30.83 |
| 2026-02-11 00:00 |
07:33:05.78 |
+40:09:10.8 |
HIP 36533 |
30.20 |
| 2026-02-11 12:00 |
07:33:01.90 |
+40:09:12.6 |
HIP 36533 |
29.58 |
| 2026-02-12 00:00 |
07:32:58.05 |
+40:09:14.3 |
HIP 36533 |
28.97 |
| 2026-02-12 12:00 |
07:32:54.21 |
+40:09:15.9 |
HIP 36533 |
28.37 |
| 2026-02-13 00:00 |
07:32:50.40 |
+40:09:17.2 |
HIP 36533 |
27.78 |
| 2026-02-13 12:00 |
07:32:46.61 |
+40:09:18.4 |
HIP 36533 |
27.21 |
| 2026-02-14 00:00 |
07:32:42.84 |
+40:09:19.5 |
HIP 36533 |
26.65 |
| 2026-02-14 12:00 |
07:32:39.09 |
+40:09:20.4 |
HIP 36533 |
26.10 |
| 2026-02-15 00:00 |
07:32:35.37 |
+40:09:21.1 |
HIP 36533 |
25.56 |
| 2026-02-15 12:00 |
07:32:31.67 |
+40:09:21.6 |
HIP 36533 |
25.04 |
| 2026-02-16 00:00 |
07:32:27.99 |
+40:09:22.0 |
HIP 36533 |
24.53 |
| 2026-02-16 12:00 |
07:32:24.34 |
+40:09:22.3 |
HIP 36533 |
24.03 |
| 2026-02-17 00:00 |
07:32:20.71 |
+40:09:22.3 |
HIP 36533 |
23.55 |
| 2026-02-17 12:00 |
07:32:17.11 |
+40:09:22.3 |
HIP 36533 |
23.09 |
| 2026-02-18 00:00 |
07:32:13.53 |
+40:09:22.0 |
HIP 36533 |
22.64 |
| 2026-02-18 12:00 |
07:32:09.98 |
+40:09:21.6 |
HIP 36533 |
22.22 |
| 2026-02-19 00:00 |
07:32:06.45 |
+40:09:21.0 |
HIP 36533 |
21.80 |
| 2026-02-19 12:00 |
07:32:02.94 |
+40:09:20.3 |
HIP 36533 |
21.41 |
| 2026-02-20 00:00 |
07:31:59.47 |
+40:09:19.4 |
HIP 36533 |
21.04 |
| 2026-02-20 12:00 |
07:31:56.01 |
+40:09:18.4 |
HIP 36533 |
20.68 |
| 2026-02-21 00:00 |
07:31:52.59 |
+40:09:17.2 |
HIP 36533 |
20.35 |
| 2026-02-21 12:00 |
07:31:49.19 |
+40:09:15.9 |
HIP 36533 |
20.03 |
| 2026-02-22 00:00 |
07:31:45.82 |
+40:09:14.4 |
HIP 36533 |
19.74 |
| 2026-02-22 12:00 |
07:31:42.47 |
+40:09:12.7 |
HIP 36533 |
19.46 |
| 2026-02-23 00:00 |
07:31:39.16 |
+40:09:10.9 |
HIP 36443 |
19.10 |
| 2026-02-23 12:00 |
07:31:35.87 |
+40:09:09.0 |
HIP 36443 |
18.47 |
| 2026-02-24 00:00 |
07:31:32.61 |
+40:09:06.9 |
HIP 36443 |
17.85 |