| Parameter |
Value |
| Designation |
C/2002 J4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-10-03T04:21:57.335040Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:21Z |
| Obs used |
228 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-06.0000000 |
| e |
0.99989069 |
| q (au) |
3.633732 |
| a (au) |
33243.727305 |
| i (deg) |
46.525144 |
| Ω (om, deg) |
70.884245 |
| ω (w, deg) |
230.709337 |
| M (ma, deg) |
359.999971 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.255 + 3.626\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.255 |
| n |
3.626 |
| gf |
0.983 |
| gb |
-0.894 |
| k |
0.999 |
| δ90 |
9.909 |
| 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) |
| 2026-06-01 00:00 |
05:21:47.67 |
+34:40:26.1 |
HIP 25030 |
4.89 |
| 2026-06-01 12:00 |
05:21:51.07 |
+34:40:29.1 |
HIP 25030 |
5.24 |
| 2026-06-02 00:00 |
05:21:54.46 |
+34:40:32.3 |
HIP 25030 |
5.65 |
| 2026-06-02 12:00 |
05:21:57.86 |
+34:40:35.5 |
HIP 25030 |
6.12 |
| 2026-06-03 00:00 |
05:22:01.27 |
+34:40:38.7 |
HIP 25030 |
6.62 |
| 2026-06-03 12:00 |
05:22:04.68 |
+34:40:42.0 |
HIP 25030 |
7.16 |
| 2026-06-04 00:00 |
05:22:08.09 |
+34:40:45.4 |
HIP 25030 |
7.73 |
| 2026-06-04 12:00 |
05:22:11.51 |
+34:40:48.9 |
HIP 25030 |
8.32 |
| 2026-06-05 00:00 |
05:22:14.93 |
+34:40:52.4 |
HIP 25030 |
8.92 |
| 2026-06-05 12:00 |
05:22:18.35 |
+34:40:56.0 |
HIP 25030 |
9.54 |
| 2026-06-06 00:00 |
05:22:21.78 |
+34:40:59.6 |
HIP 25030 |
10.17 |
| 2026-06-06 12:00 |
05:22:25.21 |
+34:41:03.4 |
HIP 25030 |
10.81 |
| 2026-06-07 00:00 |
05:22:28.64 |
+34:41:07.1 |
HIP 25030 |
11.46 |
| 2026-06-07 12:00 |
05:22:32.07 |
+34:41:11.0 |
HIP 25030 |
12.11 |
| 2026-06-08 00:00 |
05:22:35.51 |
+34:41:14.9 |
HIP 25030 |
12.78 |
| 2026-06-08 12:00 |
05:22:38.95 |
+34:41:18.9 |
HIP 25030 |
13.44 |
| 2026-06-09 00:00 |
05:22:42.39 |
+34:41:22.9 |
HIP 25030 |
14.11 |
| 2026-06-09 12:00 |
05:22:45.83 |
+34:41:27.0 |
HIP 25030 |
14.79 |
| 2026-06-10 00:00 |
05:22:49.27 |
+34:41:31.2 |
HIP 25030 |
15.46 |
| 2026-06-10 12:00 |
05:22:52.72 |
+34:41:35.4 |
HIP 25030 |
16.14 |
| 2026-06-11 00:00 |
05:22:56.16 |
+34:41:39.7 |
HIP 25030 |
16.83 |
| 2026-06-11 12:00 |
05:22:59.61 |
+34:41:44.1 |
HIP 25030 |
17.51 |
| 2026-06-12 00:00 |
05:23:03.06 |
+34:41:48.5 |
HIP 25030 |
18.20 |
| 2026-06-12 12:00 |
05:23:06.50 |
+34:41:53.0 |
HIP 25030 |
18.89 |
| 2026-06-13 00:00 |
05:23:09.95 |
+34:41:57.5 |
HIP 25030 |
19.58 |
| 2026-06-13 12:00 |
05:23:13.40 |
+34:42:02.1 |
HIP 25030 |
20.27 |
| 2026-06-14 00:00 |
05:23:16.85 |
+34:42:06.8 |
HIP 25030 |
20.96 |
| 2026-06-14 12:00 |
05:23:20.29 |
+34:42:11.5 |
HIP 25030 |
21.66 |
| 2026-06-15 00:00 |
05:23:23.74 |
+34:42:16.3 |
HIP 25030 |
22.35 |
| 2026-06-15 12:00 |
05:23:27.18 |
+34:42:21.2 |
HIP 25030 |
23.05 |
| 2026-06-16 00:00 |
05:23:30.62 |
+34:42:26.1 |
HIP 25343 |
22.81 |
| 2026-06-16 12:00 |
05:23:34.06 |
+34:42:31.1 |
HIP 25343 |
22.12 |
| 2026-06-17 00:00 |
05:23:37.50 |
+34:42:36.1 |
HIP 25343 |
21.44 |
| 2026-06-17 12:00 |
05:23:40.94 |
+34:42:41.2 |
HIP 25343 |
20.77 |
| 2026-06-18 00:00 |
05:23:44.38 |
+34:42:46.4 |
HIP 25343 |
20.09 |
| 2026-06-18 12:00 |
05:23:47.81 |
+34:42:51.6 |
HIP 25343 |
19.42 |
| 2026-06-19 00:00 |
05:23:51.24 |
+34:42:56.9 |
HIP 25343 |
18.74 |
| 2026-06-19 12:00 |
05:23:54.66 |
+34:43:02.2 |
HIP 25343 |
18.08 |
| 2026-06-20 00:00 |
05:23:58.09 |
+34:43:07.7 |
HIP 25343 |
17.41 |
| 2026-06-20 12:00 |
05:24:01.51 |
+34:43:13.1 |
HIP 25343 |
16.75 |
| 2026-06-21 00:00 |
05:24:04.92 |
+34:43:18.6 |
HIP 25343 |
16.09 |
| 2026-06-21 12:00 |
05:24:08.34 |
+34:43:24.2 |
HIP 25343 |
15.44 |
| 2026-06-22 00:00 |
05:24:11.75 |
+34:43:29.9 |
HIP 25343 |
14.79 |