303P/NEAT
| Parameter |
Value |
| Designation |
303P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-10-10T07:58:46.963200Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:51Z |
| Obs used |
251 |
| NEO |
- |
| M1 |
16.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-12.0000000 |
| e |
0.51039462 |
| q (au) |
2.483970 |
| a (au) |
5.073413 |
| i (deg) |
7.038016 |
| Ω (om, deg) |
348.196199 |
| ω (w, deg) |
356.711414 |
| M (ma, deg) |
218.350575 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.989 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.989 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:18:38.65 |
-11:17:41.4 |
HIP 110169 |
16.27 |
| 2026-02-03 12:00 |
22:19:34.71 |
-11:11:28.5 |
HIP 110169 |
23.98 |
| 2026-02-04 00:00 |
22:20:30.77 |
-11:05:14.9 |
HIP 110193 |
25.29 |
| 2026-02-04 12:00 |
22:21:26.81 |
-10:59:00.7 |
HIP 110439 |
13.68 |
| 2026-02-05 00:00 |
22:22:22.84 |
-10:52:45.7 |
HIP 110439 |
3.33 |
| 2026-02-05 12:00 |
22:23:18.86 |
-10:46:30.1 |
HIP 110439 |
17.08 |
| 2026-02-06 00:00 |
22:24:14.86 |
-10:40:13.8 |
HIP 110580 |
28.43 |
| 2026-02-06 12:00 |
22:25:10.86 |
-10:33:56.8 |
HIP 110796 |
24.42 |
| 2026-02-07 00:00 |
22:26:06.84 |
-10:27:39.1 |
HIP 110796 |
14.34 |
| 2026-02-07 12:00 |
22:27:02.81 |
-10:21:20.8 |
HIP 110796 |
16.54 |
| 2026-02-08 00:00 |
22:27:58.77 |
-10:15:01.8 |
HIP 110976 |
24.30 |
| 2026-02-08 12:00 |
22:28:54.72 |
-10:08:42.2 |
HIP 110976 |
12.20 |
| 2026-02-09 00:00 |
22:29:50.65 |
-10:02:22.0 |
HIP 110976 |
12.89 |
| 2026-02-09 12:00 |
22:30:46.57 |
-09:56:01.1 |
HIP 110976 |
25.36 |
| 2026-02-10 00:00 |
22:31:42.47 |
-09:49:39.6 |
HIP 111173 |
24.79 |
| 2026-02-10 12:00 |
22:32:38.37 |
-09:43:17.5 |
HIP 111398 |
22.78 |
| 2026-02-11 00:00 |
22:33:34.25 |
-09:36:54.7 |
HIP 111398 |
7.99 |
| 2026-02-11 12:00 |
22:34:30.11 |
-09:30:31.4 |
HIP 111398 |
8.33 |
| 2026-02-12 00:00 |
22:35:25.96 |
-09:24:07.5 |
HIP 111414 |
17.13 |
| 2026-02-12 12:00 |
22:36:21.79 |
-09:17:43.0 |
HIP 111637 |
10.10 |
| 2026-02-13 00:00 |
22:37:17.61 |
-09:11:18.0 |
HIP 111637 |
13.21 |
| 2026-02-13 12:00 |
22:38:13.42 |
-09:04:52.3 |
HIP 111820 |
26.14 |
| 2026-02-14 00:00 |
22:39:09.21 |
-08:58:26.1 |
HIP 111820 |
17.59 |
| 2026-02-14 12:00 |
22:40:04.98 |
-08:51:59.4 |
HIP 111820 |
19.95 |
| 2026-02-15 00:00 |
22:41:00.74 |
-08:45:32.1 |
HIP 111820 |
30.81 |
| 2026-02-15 12:00 |
22:41:56.48 |
-08:39:04.3 |
HIP 112199 |
26.21 |
| 2026-02-16 00:00 |
22:42:52.20 |
-08:32:35.9 |
HIP 112199 |
11.26 |
| 2026-02-16 12:00 |
22:43:47.91 |
-08:26:07.1 |
HIP 112199 |
5.46 |
| 2026-02-17 00:00 |
22:44:43.60 |
-08:19:37.7 |
HIP 112199 |
19.91 |
| 2026-02-17 12:00 |
22:45:39.27 |
-08:13:07.8 |
HIP 112427 |
14.48 |
| 2026-02-18 00:00 |
22:46:34.92 |
-08:06:37.5 |
HIP 112427 |
17.09 |
| 2026-02-18 12:00 |
22:47:30.55 |
-08:00:06.7 |
HIP 112604 |
14.47 |
| 2026-02-19 00:00 |
22:48:26.17 |
-07:53:35.4 |
HIP 112604 |
13.18 |
| 2026-02-19 12:00 |
22:49:21.77 |
-07:47:03.6 |
HIP 112769 |
23.41 |
| 2026-02-20 00:00 |
22:50:17.34 |
-07:40:31.4 |
HIP 112769 |
12.96 |
| 2026-02-20 12:00 |
22:51:12.90 |
-07:33:58.8 |
HIP 112769 |
15.88 |
| 2026-02-21 00:00 |
22:52:08.44 |
-07:27:25.7 |
HIP 112961 |
10.18 |
| 2026-02-21 12:00 |
22:53:03.95 |
-07:20:52.2 |
HIP 113059 |
10.85 |
| 2026-02-22 00:00 |
22:53:59.45 |
-07:14:18.3 |
HIP 113127 |
8.84 |
| 2026-02-22 12:00 |
22:54:54.92 |
-07:07:43.9 |
HIP 113127 |
6.87 |
| 2026-02-23 00:00 |
22:55:50.38 |
-07:01:09.2 |
HIP 113150 |
16.20 |
| 2026-02-23 12:00 |
22:56:45.81 |
-06:54:34.1 |
HIP 113329 |
7.30 |
| 2026-02-24 00:00 |
22:57:41.22 |
-06:47:58.6 |
HIP 113329 |
9.15 |