| 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
$$
M_a = (13.480 + 2.073\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.480 |
| n |
2.073 |
| gf |
0.975 |
| gb |
-0.678 |
| k |
0.800 |
| δ90 |
9.980 |
| 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 |
+1.1886 |
-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) |
| 2026-09-20 00:00 |
07:43:52.64 |
+39:33:50.2 |
HIP 37789 |
12.25 |
| 2026-09-20 12:00 |
07:43:54.36 |
+39:34:03.4 |
HIP 37789 |
11.93 |
| 2026-09-21 00:00 |
07:43:56.04 |
+39:34:16.8 |
HIP 37789 |
11.62 |
| 2026-09-21 12:00 |
07:43:57.69 |
+39:34:30.2 |
HIP 37789 |
11.32 |
| 2026-09-22 00:00 |
07:43:59.32 |
+39:34:43.8 |
HIP 37789 |
11.03 |
| 2026-09-22 12:00 |
07:44:00.91 |
+39:34:57.5 |
HIP 37789 |
10.75 |
| 2026-09-23 00:00 |
07:44:02.47 |
+39:35:11.3 |
HIP 37789 |
10.49 |
| 2026-09-23 12:00 |
07:44:04.00 |
+39:35:25.3 |
HIP 37789 |
10.24 |
| 2026-09-24 00:00 |
07:44:05.50 |
+39:35:39.3 |
HIP 37789 |
10.00 |
| 2026-09-24 12:00 |
07:44:06.96 |
+39:35:53.5 |
HIP 37789 |
9.78 |
| 2026-09-25 00:00 |
07:44:08.40 |
+39:36:07.8 |
HIP 37789 |
9.58 |
| 2026-09-25 12:00 |
07:44:09.80 |
+39:36:22.2 |
HIP 37789 |
9.39 |
| 2026-09-26 00:00 |
07:44:11.18 |
+39:36:36.7 |
HIP 37789 |
9.22 |
| 2026-09-26 12:00 |
07:44:12.52 |
+39:36:51.3 |
HIP 37789 |
9.06 |
| 2026-09-27 00:00 |
07:44:13.83 |
+39:37:06.0 |
HIP 37789 |
8.92 |
| 2026-09-27 12:00 |
07:44:15.11 |
+39:37:20.9 |
HIP 37789 |
8.81 |
| 2026-09-28 00:00 |
07:44:16.35 |
+39:37:35.8 |
HIP 37789 |
8.71 |
| 2026-09-28 12:00 |
07:44:17.56 |
+39:37:50.9 |
HIP 37789 |
8.62 |
| 2026-09-29 00:00 |
07:44:18.74 |
+39:38:06.1 |
HIP 37789 |
8.56 |
| 2026-09-29 12:00 |
07:44:19.89 |
+39:38:21.4 |
HIP 37789 |
8.52 |
| 2026-09-30 00:00 |
07:44:21.01 |
+39:38:36.8 |
HIP 37789 |
8.50 |
| 2026-09-30 12:00 |
07:44:22.09 |
+39:38:52.3 |
HIP 37789 |
8.49 |
| 2026-10-01 00:00 |
07:44:23.14 |
+39:39:07.9 |
HIP 37789 |
8.51 |
| 2026-10-01 12:00 |
07:44:24.16 |
+39:39:23.6 |
HIP 37789 |
8.54 |
| 2026-10-02 00:00 |
07:44:25.14 |
+39:39:39.5 |
HIP 37789 |
8.59 |
| 2026-10-02 12:00 |
07:44:26.10 |
+39:39:55.4 |
HIP 37789 |
8.66 |
| 2026-10-03 00:00 |
07:44:27.01 |
+39:40:11.5 |
HIP 37789 |
8.75 |
| 2026-10-03 12:00 |
07:44:27.90 |
+39:40:27.6 |
HIP 37789 |
8.85 |
| 2026-10-04 00:00 |
07:44:28.75 |
+39:40:43.9 |
HIP 37789 |
8.97 |
| 2026-10-04 12:00 |
07:44:29.56 |
+39:41:00.2 |
HIP 37789 |
9.10 |
| 2026-10-05 00:00 |
07:44:30.35 |
+39:41:16.7 |
HIP 37789 |
9.25 |
| 2026-10-05 12:00 |
07:44:31.10 |
+39:41:33.2 |
HIP 37789 |
9.41 |
| 2026-10-06 00:00 |
07:44:31.81 |
+39:41:49.9 |
HIP 37789 |
9.58 |
| 2026-10-06 12:00 |
07:44:32.49 |
+39:42:06.7 |
HIP 37789 |
9.76 |
| 2026-10-07 00:00 |
07:44:33.14 |
+39:42:23.5 |
HIP 37789 |
9.95 |
| 2026-10-07 12:00 |
07:44:33.75 |
+39:42:40.5 |
HIP 37789 |
10.16 |
| 2026-10-08 00:00 |
07:44:34.32 |
+39:42:57.5 |
HIP 37789 |
10.37 |
| 2026-10-08 12:00 |
07:44:34.87 |
+39:43:14.7 |
HIP 37789 |
10.59 |
| 2026-10-09 00:00 |
07:44:35.37 |
+39:43:31.9 |
HIP 37789 |
10.82 |
| 2026-10-09 12:00 |
07:44:35.85 |
+39:43:49.3 |
HIP 37789 |
11.06 |
| 2026-10-10 00:00 |
07:44:36.28 |
+39:44:06.7 |
HIP 37789 |
11.30 |
| 2026-10-10 12:00 |
07:44:36.69 |
+39:44:24.3 |
HIP 37789 |
11.55 |
| 2026-10-11 00:00 |
07:44:37.05 |
+39:44:41.9 |
HIP 37789 |
11.80 |