| Parameter |
Value |
| Designation |
C/2002 K4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-07-12T23:22:20.225280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:17Z |
| Obs used |
243 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-07-12.0000000 |
| e |
0.84228241 |
| q (au) |
2.764517 |
| a (au) |
17.528275 |
| i (deg) |
94.062769 |
| Ω (om, deg) |
308.099007 |
| ω (w, deg) |
24.431756 |
| M (ma, deg) |
359.986921 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.935 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.935 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
08:23:42.82 |
+05:14:02.2 |
HIP 41240 |
18.91 |
| 2026-07-29 12:00 |
08:23:46.45 |
+05:13:44.4 |
HIP 41240 |
18.20 |
| 2026-07-30 00:00 |
08:23:50.07 |
+05:13:26.5 |
HIP 41240 |
17.50 |
| 2026-07-30 12:00 |
08:23:53.70 |
+05:13:08.4 |
HIP 41240 |
16.83 |
| 2026-07-31 00:00 |
08:23:57.32 |
+05:12:50.3 |
HIP 41240 |
16.19 |
| 2026-07-31 12:00 |
08:24:00.94 |
+05:12:32.0 |
HIP 41240 |
15.59 |
| 2026-08-01 00:00 |
08:24:04.56 |
+05:12:13.7 |
HIP 41240 |
15.02 |
| 2026-08-01 12:00 |
08:24:08.17 |
+05:11:55.2 |
HIP 41240 |
14.49 |
| 2026-08-02 00:00 |
08:24:11.78 |
+05:11:36.6 |
HIP 41240 |
14.01 |
| 2026-08-02 12:00 |
08:24:15.39 |
+05:11:18.0 |
HIP 41240 |
13.58 |
| 2026-08-03 00:00 |
08:24:19.00 |
+05:10:59.2 |
HIP 41240 |
13.21 |
| 2026-08-03 12:00 |
08:24:22.60 |
+05:10:40.3 |
HIP 41240 |
12.90 |
| 2026-08-04 00:00 |
08:24:26.20 |
+05:10:21.3 |
HIP 41240 |
12.65 |
| 2026-08-04 12:00 |
08:24:29.79 |
+05:10:02.1 |
HIP 41240 |
12.48 |
| 2026-08-05 00:00 |
08:24:33.38 |
+05:09:42.9 |
HIP 41240 |
12.37 |
| 2026-08-05 12:00 |
08:24:36.96 |
+05:09:23.6 |
HIP 41240 |
12.34 |
| 2026-08-06 00:00 |
08:24:40.55 |
+05:09:04.2 |
HIP 41240 |
12.39 |
| 2026-08-06 12:00 |
08:24:44.12 |
+05:08:44.7 |
HIP 41240 |
12.51 |
| 2026-08-07 00:00 |
08:24:47.69 |
+05:08:25.0 |
HIP 41240 |
12.70 |
| 2026-08-07 12:00 |
08:24:51.26 |
+05:08:05.3 |
HIP 41240 |
12.96 |
| 2026-08-08 00:00 |
08:24:54.82 |
+05:07:45.5 |
HIP 41240 |
13.29 |
| 2026-08-08 12:00 |
08:24:58.37 |
+05:07:25.6 |
HIP 41240 |
13.67 |
| 2026-08-09 00:00 |
08:25:01.92 |
+05:07:05.6 |
HIP 41240 |
14.11 |
| 2026-08-09 12:00 |
08:25:05.46 |
+05:06:45.5 |
HIP 41240 |
14.59 |
| 2026-08-10 00:00 |
08:25:08.99 |
+05:06:25.2 |
HIP 41240 |
15.13 |
| 2026-08-10 12:00 |
08:25:12.52 |
+05:06:04.9 |
HIP 41240 |
15.70 |
| 2026-08-11 00:00 |
08:25:16.04 |
+05:05:44.5 |
HIP 41240 |
16.30 |
| 2026-08-11 12:00 |
08:25:19.55 |
+05:05:24.1 |
HIP 41240 |
16.94 |
| 2026-08-12 00:00 |
08:25:23.06 |
+05:05:03.5 |
HIP 41240 |
17.60 |
| 2026-08-12 12:00 |
08:25:26.55 |
+05:04:42.8 |
HIP 41240 |
18.29 |
| 2026-08-13 00:00 |
08:25:30.04 |
+05:04:22.0 |
HIP 41240 |
19.00 |
| 2026-08-13 12:00 |
08:25:33.52 |
+05:04:01.2 |
HIP 41240 |
19.73 |
| 2026-08-14 00:00 |
08:25:36.99 |
+05:03:40.3 |
HIP 41240 |
20.48 |
| 2026-08-14 12:00 |
08:25:40.46 |
+05:03:19.3 |
HIP 41240 |
21.24 |
| 2026-08-15 00:00 |
08:25:43.91 |
+05:02:58.2 |
HIP 41240 |
22.02 |
| 2026-08-15 12:00 |
08:25:47.35 |
+05:02:37.0 |
HIP 41240 |
22.80 |
| 2026-08-16 00:00 |
08:25:50.79 |
+05:02:15.7 |
HIP 41240 |
23.60 |
| 2026-08-16 12:00 |
08:25:54.21 |
+05:01:54.4 |
HIP 41240 |
24.40 |
| 2026-08-17 00:00 |
08:25:57.63 |
+05:01:32.9 |
HIP 41240 |
25.21 |
| 2026-08-17 12:00 |
08:26:01.03 |
+05:01:11.4 |
HIP 41240 |
26.03 |
| 2026-08-18 00:00 |
08:26:04.42 |
+05:00:49.8 |
HIP 41240 |
26.85 |
| 2026-08-18 12:00 |
08:26:07.80 |
+05:00:28.2 |
HIP 41240 |
27.68 |
| 2026-08-19 00:00 |
08:26:11.18 |
+05:00:06.5 |
HIP 41509 |
28.30 |