| 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) |
| 2026-03-26 00:00 |
07:29:14.64 |
+40:02:57.8 |
HIP 36443 |
9.71 |
| 2026-03-26 12:00 |
07:29:13.39 |
+40:02:48.2 |
HIP 36443 |
10.00 |
| 2026-03-27 00:00 |
07:29:12.18 |
+40:02:38.5 |
HIP 36443 |
10.28 |
| 2026-03-27 12:00 |
07:29:11.01 |
+40:02:28.8 |
HIP 36443 |
10.55 |
| 2026-03-28 00:00 |
07:29:09.87 |
+40:02:18.9 |
HIP 36443 |
10.82 |
| 2026-03-28 12:00 |
07:29:08.77 |
+40:02:09.0 |
HIP 36443 |
11.09 |
| 2026-03-29 00:00 |
07:29:07.71 |
+40:01:59.0 |
HIP 36443 |
11.35 |
| 2026-03-29 12:00 |
07:29:06.68 |
+40:01:48.9 |
HIP 36443 |
11.60 |
| 2026-03-30 00:00 |
07:29:05.69 |
+40:01:38.7 |
HIP 36443 |
11.85 |
| 2026-03-30 12:00 |
07:29:04.74 |
+40:01:28.4 |
HIP 36443 |
12.09 |
| 2026-03-31 00:00 |
07:29:03.82 |
+40:01:18.1 |
HIP 36443 |
12.33 |
| 2026-03-31 12:00 |
07:29:02.94 |
+40:01:07.7 |
HIP 36443 |
12.56 |
| 2026-04-01 00:00 |
07:29:02.09 |
+40:00:57.2 |
HIP 36443 |
12.79 |
| 2026-04-01 12:00 |
07:29:01.28 |
+40:00:46.6 |
HIP 36443 |
13.01 |
| 2026-04-02 00:00 |
07:29:00.51 |
+40:00:36.0 |
HIP 36443 |
13.23 |
| 2026-04-02 12:00 |
07:28:59.77 |
+40:00:25.3 |
HIP 36443 |
13.45 |
| 2026-04-03 00:00 |
07:28:59.07 |
+40:00:14.5 |
HIP 36443 |
13.66 |
| 2026-04-03 12:00 |
07:28:58.41 |
+40:00:03.6 |
HIP 36443 |
13.86 |
| 2026-04-04 00:00 |
07:28:57.78 |
+39:59:52.7 |
HIP 36443 |
14.06 |
| 2026-04-04 12:00 |
07:28:57.19 |
+39:59:41.7 |
HIP 36443 |
14.25 |
| 2026-04-05 00:00 |
07:28:56.64 |
+39:59:30.6 |
HIP 36443 |
14.44 |
| 2026-04-05 12:00 |
07:28:56.12 |
+39:59:19.4 |
HIP 36443 |
14.63 |
| 2026-04-06 00:00 |
07:28:55.64 |
+39:59:08.2 |
HIP 36443 |
14.81 |
| 2026-04-06 12:00 |
07:28:55.19 |
+39:58:57.0 |
HIP 36443 |
14.99 |
| 2026-04-07 00:00 |
07:28:54.78 |
+39:58:45.6 |
HIP 36443 |
15.16 |
| 2026-04-07 12:00 |
07:28:54.41 |
+39:58:34.2 |
HIP 36443 |
15.33 |
| 2026-04-08 00:00 |
07:28:54.08 |
+39:58:22.8 |
HIP 36443 |
15.49 |
| 2026-04-08 12:00 |
07:28:53.78 |
+39:58:11.3 |
HIP 36443 |
15.65 |
| 2026-04-09 00:00 |
07:28:53.52 |
+39:57:59.7 |
HIP 36443 |
15.81 |
| 2026-04-09 12:00 |
07:28:53.29 |
+39:57:48.0 |
HIP 36443 |
15.96 |
| 2026-04-10 00:00 |
07:28:53.10 |
+39:57:36.3 |
HIP 36443 |
16.11 |
| 2026-04-10 12:00 |
07:28:52.94 |
+39:57:24.6 |
HIP 36443 |
16.25 |
| 2026-04-11 00:00 |
07:28:52.83 |
+39:57:12.8 |
HIP 36443 |
16.39 |
| 2026-04-11 12:00 |
07:28:52.75 |
+39:57:00.9 |
HIP 36443 |
16.53 |
| 2026-04-12 00:00 |
07:28:52.70 |
+39:56:49.0 |
HIP 36443 |
16.66 |
| 2026-04-12 12:00 |
07:28:52.69 |
+39:56:37.1 |
HIP 36443 |
16.79 |
| 2026-04-13 00:00 |
07:28:52.72 |
+39:56:25.1 |
HIP 36443 |
16.92 |
| 2026-04-13 12:00 |
07:28:52.78 |
+39:56:13.0 |
HIP 36443 |
17.04 |
| 2026-04-14 00:00 |
07:28:52.88 |
+39:56:00.9 |
HIP 36443 |
17.16 |
| 2026-04-14 12:00 |
07:28:53.02 |
+39:55:48.7 |
HIP 36443 |
17.28 |
| 2026-04-15 00:00 |
07:28:53.19 |
+39:55:36.5 |
HIP 36443 |
17.39 |
| 2026-04-15 12:00 |
07:28:53.40 |
+39:55:24.3 |
HIP 36443 |
17.50 |
| 2026-04-16 00:00 |
07:28:53.64 |
+39:55:12.0 |
HIP 36443 |
17.61 |