C/2002 K4 (NEAT)
| 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 |
0.998 |
| 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) |
| 2026-02-03 00:00 |
08:22:38.87 |
+04:48:01.6 |
HIP 41032 |
13.26 |
| 2026-02-03 12:00 |
08:22:34.72 |
+04:48:13.9 |
HIP 41032 |
12.87 |
| 2026-02-04 00:00 |
08:22:30.57 |
+04:48:26.3 |
HIP 41032 |
12.56 |
| 2026-02-04 12:00 |
08:22:26.44 |
+04:48:38.7 |
HIP 41032 |
12.32 |
| 2026-02-05 00:00 |
08:22:22.30 |
+04:48:51.3 |
HIP 41032 |
12.17 |
| 2026-02-05 12:00 |
08:22:18.18 |
+04:49:04.0 |
HIP 41032 |
12.11 |
| 2026-02-06 00:00 |
08:22:14.07 |
+04:49:16.8 |
HIP 41032 |
12.13 |
| 2026-02-06 12:00 |
08:22:09.96 |
+04:49:29.7 |
HIP 41032 |
12.25 |
| 2026-02-07 00:00 |
08:22:05.87 |
+04:49:42.8 |
HIP 41032 |
12.44 |
| 2026-02-07 12:00 |
08:22:01.78 |
+04:49:55.9 |
HIP 41032 |
12.72 |
| 2026-02-08 00:00 |
08:21:57.71 |
+04:50:09.1 |
HIP 41032 |
13.07 |
| 2026-02-08 12:00 |
08:21:53.64 |
+04:50:22.4 |
HIP 41032 |
13.49 |
| 2026-02-09 00:00 |
08:21:49.58 |
+04:50:35.8 |
HIP 41032 |
13.97 |
| 2026-02-09 12:00 |
08:21:45.54 |
+04:50:49.3 |
HIP 41032 |
14.51 |
| 2026-02-10 00:00 |
08:21:41.50 |
+04:51:02.9 |
HIP 41032 |
15.09 |
| 2026-02-10 12:00 |
08:21:37.48 |
+04:51:16.5 |
HIP 41032 |
15.72 |
| 2026-02-11 00:00 |
08:21:33.47 |
+04:51:30.3 |
HIP 41032 |
16.39 |
| 2026-02-11 12:00 |
08:21:29.47 |
+04:51:44.2 |
HIP 41032 |
17.08 |
| 2026-02-12 00:00 |
08:21:25.49 |
+04:51:58.1 |
HIP 41032 |
17.81 |
| 2026-02-12 12:00 |
08:21:21.51 |
+04:52:12.2 |
HIP 41032 |
18.56 |
| 2026-02-13 00:00 |
08:21:17.55 |
+04:52:26.3 |
HIP 41032 |
19.33 |
| 2026-02-13 12:00 |
08:21:13.61 |
+04:52:40.5 |
HIP 41032 |
20.11 |
| 2026-02-14 00:00 |
08:21:09.67 |
+04:52:54.8 |
HIP 40892 |
19.75 |
| 2026-02-14 12:00 |
08:21:05.76 |
+04:53:09.1 |
HIP 40892 |
19.20 |
| 2026-02-15 00:00 |
08:21:01.85 |
+04:53:23.6 |
HIP 40892 |
18.68 |
| 2026-02-15 12:00 |
08:20:57.96 |
+04:53:38.1 |
HIP 40892 |
18.20 |
| 2026-02-16 00:00 |
08:20:54.09 |
+04:53:52.7 |
HIP 40892 |
17.77 |
| 2026-02-16 12:00 |
08:20:50.23 |
+04:54:07.3 |
HIP 40820 |
17.26 |
| 2026-02-17 00:00 |
08:20:46.39 |
+04:54:22.1 |
HIP 40820 |
16.61 |
| 2026-02-17 12:00 |
08:20:42.56 |
+04:54:36.9 |
HIP 40820 |
16.01 |
| 2026-02-18 00:00 |
08:20:38.75 |
+04:54:51.8 |
HIP 40820 |
15.44 |
| 2026-02-18 12:00 |
08:20:34.96 |
+04:55:06.7 |
HIP 40820 |
14.93 |
| 2026-02-19 00:00 |
08:20:31.18 |
+04:55:21.7 |
HIP 40820 |
14.46 |
| 2026-02-19 12:00 |
08:20:27.42 |
+04:55:36.7 |
HIP 40820 |
14.05 |
| 2026-02-20 00:00 |
08:20:23.68 |
+04:55:51.9 |
HIP 40820 |
13.70 |
| 2026-02-20 12:00 |
08:20:19.96 |
+04:56:07.1 |
HIP 40820 |
13.42 |
| 2026-02-21 00:00 |
08:20:16.25 |
+04:56:22.3 |
HIP 40820 |
13.20 |
| 2026-02-21 12:00 |
08:20:12.57 |
+04:56:37.6 |
HIP 40820 |
13.05 |
| 2026-02-22 00:00 |
08:20:08.90 |
+04:56:52.9 |
HIP 40820 |
12.97 |
| 2026-02-22 12:00 |
08:20:05.25 |
+04:57:08.3 |
HIP 40820 |
12.96 |
| 2026-02-23 00:00 |
08:20:01.62 |
+04:57:23.8 |
HIP 40820 |
13.02 |
| 2026-02-23 12:00 |
08:19:58.01 |
+04:57:39.3 |
HIP 40820 |
13.15 |
| 2026-02-24 00:00 |
08:19:54.42 |
+04:57:54.8 |
HIP 40820 |
13.35 |