502P/NEAT
| Parameter |
Value |
| Designation |
502P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-08-05T23:40:46.439040Z |
| Orbit solution date (soln_date, UTC) |
2025-12-12T11:12:46Z |
| Obs used |
281 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
15.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-10-06.0000000 |
| e |
0.47091682 |
| q (au) |
4.259801 |
| a (au) |
8.051288 |
| i (deg) |
11.386402 |
| Ω (om, deg) |
264.572232 |
| ω (w, deg) |
37.192514 |
| M (ma, deg) |
236.569669 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.067 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.067 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.727 |
| k |
0.800 |
| δ90 |
9.997 |
| 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 |
21:34:05.21 |
-05:44:36.5 |
HIP 106464 |
20.06 |
| 2026-02-03 12:00 |
21:34:38.22 |
-05:41:36.6 |
HIP 106464 |
20.95 |
| 2026-02-04 00:00 |
21:35:11.21 |
-05:38:36.1 |
HIP 106464 |
25.07 |
| 2026-02-04 12:00 |
21:35:44.20 |
-05:35:35.1 |
HIP 106702 |
29.32 |
| 2026-02-05 00:00 |
21:36:17.18 |
-05:32:33.6 |
HIP 106702 |
28.75 |
| 2026-02-05 12:00 |
21:36:50.15 |
-05:29:31.5 |
HIP 106796 |
21.63 |
| 2026-02-06 00:00 |
21:37:23.11 |
-05:26:28.9 |
HIP 106796 |
14.26 |
| 2026-02-06 12:00 |
21:37:56.06 |
-05:23:25.8 |
HIP 106796 |
9.58 |
| 2026-02-07 00:00 |
21:38:29.00 |
-05:20:22.2 |
HIP 106796 |
11.54 |
| 2026-02-07 12:00 |
21:39:01.93 |
-05:17:18.1 |
HIP 106796 |
18.10 |
| 2026-02-08 00:00 |
21:39:34.84 |
-05:14:13.5 |
HIP 106796 |
25.99 |
| 2026-02-08 12:00 |
21:40:07.74 |
-05:11:08.4 |
HIP 106796 |
34.29 |
| 2026-02-09 00:00 |
21:40:40.63 |
-05:08:02.8 |
HIP 107158 |
39.26 |
| 2026-02-09 12:00 |
21:41:13.51 |
-05:04:56.7 |
HIP 107158 |
37.39 |
| 2026-02-10 00:00 |
21:41:46.37 |
-05:01:50.1 |
HIP 107158 |
37.53 |
| 2026-02-10 12:00 |
21:42:19.21 |
-04:58:43.0 |
HIP 107336 |
34.43 |
| 2026-02-11 00:00 |
21:42:52.04 |
-04:55:35.4 |
HIP 107336 |
25.71 |
| 2026-02-11 12:00 |
21:43:24.85 |
-04:52:27.4 |
HIP 107336 |
17.04 |
| 2026-02-12 00:00 |
21:43:57.65 |
-04:49:18.9 |
HIP 107336 |
8.52 |
| 2026-02-12 12:00 |
21:44:30.43 |
-04:46:09.9 |
HIP 107336 |
2.83 |
| 2026-02-13 00:00 |
21:45:03.19 |
-04:43:00.4 |
HIP 107336 |
9.83 |
| 2026-02-13 12:00 |
21:45:35.93 |
-04:39:50.5 |
HIP 107434 |
13.88 |
| 2026-02-14 00:00 |
21:46:08.66 |
-04:36:40.1 |
HIP 107434 |
13.62 |
| 2026-02-14 12:00 |
21:46:41.36 |
-04:33:29.3 |
HIP 107585 |
11.24 |
| 2026-02-15 00:00 |
21:47:14.04 |
-04:30:18.0 |
HIP 107585 |
6.77 |
| 2026-02-15 12:00 |
21:47:46.71 |
-04:27:06.2 |
HIP 107585 |
10.88 |
| 2026-02-16 00:00 |
21:48:19.35 |
-04:23:54.1 |
HIP 107585 |
18.55 |
| 2026-02-16 12:00 |
21:48:51.96 |
-04:20:41.4 |
HIP 107787 |
19.29 |
| 2026-02-17 00:00 |
21:49:24.56 |
-04:17:28.4 |
HIP 107787 |
10.96 |
| 2026-02-17 12:00 |
21:49:57.13 |
-04:14:14.9 |
HIP 107787 |
4.57 |
| 2026-02-18 00:00 |
21:50:29.68 |
-04:11:01.0 |
HIP 107787 |
8.63 |
| 2026-02-18 12:00 |
21:51:02.20 |
-04:07:46.7 |
HIP 107787 |
16.75 |
| 2026-02-19 00:00 |
21:51:34.70 |
-04:04:32.0 |
HIP 107993 |
18.22 |
| 2026-02-19 12:00 |
21:52:07.17 |
-04:01:16.9 |
HIP 107993 |
9.58 |
| 2026-02-20 00:00 |
21:52:39.61 |
-03:58:01.3 |
HIP 107993 |
2.01 |
| 2026-02-20 12:00 |
21:53:12.02 |
-03:54:45.4 |
HIP 107993 |
8.27 |
| 2026-02-21 00:00 |
21:53:44.41 |
-03:51:29.1 |
HIP 107993 |
16.87 |
| 2026-02-21 12:00 |
21:54:16.77 |
-03:48:12.4 |
HIP 107993 |
25.55 |
| 2026-02-22 00:00 |
21:54:49.10 |
-03:44:55.3 |
HIP 108144 |
27.05 |
| 2026-02-22 12:00 |
21:55:21.40 |
-03:41:37.8 |
HIP 108144 |
26.15 |
| 2026-02-23 00:00 |
21:55:53.66 |
-03:38:20.0 |
HIP 108144 |
28.06 |
| 2026-02-23 12:00 |
21:56:25.90 |
-03:35:01.8 |
HIP 108448 |
26.04 |
| 2026-02-24 00:00 |
21:56:58.11 |
-03:31:43.2 |
HIP 108448 |
17.54 |