P/2003 F2 (NEAT)
| Parameter |
Value |
| Designation |
P/2003 F2 (NEAT) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2003-04-14T18:46:40.431360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:27Z |
| Obs used |
74 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-04-06.0000000 |
| e |
0.54224939 |
| q (au) |
2.977207 |
| a (au) |
6.503993 |
| i (deg) |
11.604533 |
| Ω (om, deg) |
359.028575 |
| ω (w, deg) |
191.592692 |
| M (ma, deg) |
359.478147 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.477 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.477 |
| n |
2.000 |
| gf |
0.982 |
| gb |
-0.948 |
| k |
1.000 |
| δ90 |
9.631 |
| 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 |
23:29:37.94 |
-04:05:06.2 |
HIP 115953 |
26.87 |
| 2026-02-03 12:00 |
23:29:48.50 |
-04:03:48.5 |
HIP 116106 |
25.70 |
| 2026-02-04 00:00 |
23:29:59.11 |
-04:02:30.6 |
HIP 116106 |
23.17 |
| 2026-02-04 12:00 |
23:30:09.76 |
-04:01:12.3 |
HIP 116106 |
20.75 |
| 2026-02-05 00:00 |
23:30:20.46 |
-03:59:53.8 |
HIP 116106 |
18.47 |
| 2026-02-05 12:00 |
23:30:31.20 |
-03:58:35.1 |
HIP 116106 |
16.41 |
| 2026-02-06 00:00 |
23:30:41.98 |
-03:57:16.1 |
HIP 116106 |
14.67 |
| 2026-02-06 12:00 |
23:30:52.80 |
-03:55:56.8 |
HIP 116106 |
13.36 |
| 2026-02-07 00:00 |
23:31:03.66 |
-03:54:37.3 |
HIP 116106 |
12.65 |
| 2026-02-07 12:00 |
23:31:14.56 |
-03:53:17.6 |
HIP 116106 |
12.64 |
| 2026-02-08 00:00 |
23:31:25.50 |
-03:51:57.6 |
HIP 116106 |
13.34 |
| 2026-02-08 12:00 |
23:31:36.48 |
-03:50:37.4 |
HIP 116106 |
14.65 |
| 2026-02-09 00:00 |
23:31:47.50 |
-03:49:16.9 |
HIP 116106 |
16.43 |
| 2026-02-09 12:00 |
23:31:58.56 |
-03:47:56.2 |
HIP 116106 |
18.56 |
| 2026-02-10 00:00 |
23:32:09.66 |
-03:46:35.3 |
HIP 116106 |
20.93 |
| 2026-02-10 12:00 |
23:32:20.79 |
-03:45:14.2 |
HIP 116106 |
23.47 |
| 2026-02-11 00:00 |
23:32:31.96 |
-03:43:52.8 |
HIP 116106 |
26.14 |
| 2026-02-11 12:00 |
23:32:43.17 |
-03:42:31.2 |
HIP 116107 |
26.80 |
| 2026-02-12 00:00 |
23:32:54.41 |
-03:41:09.4 |
HIP 116107 |
27.79 |
| 2026-02-12 12:00 |
23:33:05.68 |
-03:39:47.4 |
HIP 116107 |
29.09 |
| 2026-02-13 00:00 |
23:33:16.99 |
-03:38:25.2 |
HIP 116244 |
30.30 |
| 2026-02-13 12:00 |
23:33:28.34 |
-03:37:02.7 |
HIP 116244 |
29.18 |
| 2026-02-14 00:00 |
23:33:39.72 |
-03:35:40.1 |
HIP 116402 |
28.34 |
| 2026-02-14 12:00 |
23:33:51.13 |
-03:34:17.3 |
HIP 116402 |
26.85 |
| 2026-02-15 00:00 |
23:34:02.57 |
-03:32:54.2 |
HIP 116402 |
25.67 |
| 2026-02-15 12:00 |
23:34:14.04 |
-03:31:31.0 |
HIP 116402 |
24.84 |
| 2026-02-16 00:00 |
23:34:25.55 |
-03:30:07.6 |
HIP 116402 |
24.40 |
| 2026-02-16 12:00 |
23:34:37.08 |
-03:28:44.0 |
HIP 116402 |
24.37 |
| 2026-02-17 00:00 |
23:34:48.65 |
-03:27:20.3 |
HIP 116402 |
24.76 |
| 2026-02-17 12:00 |
23:35:00.24 |
-03:25:56.3 |
HIP 116402 |
25.55 |
| 2026-02-18 00:00 |
23:35:11.86 |
-03:24:32.2 |
HIP 116402 |
26.70 |
| 2026-02-18 12:00 |
23:35:23.51 |
-03:23:08.0 |
HIP 116402 |
28.19 |
| 2026-02-19 00:00 |
23:35:35.19 |
-03:21:43.5 |
HIP 116520 |
29.80 |
| 2026-02-19 12:00 |
23:35:46.89 |
-03:20:18.9 |
HIP 116520 |
26.98 |
| 2026-02-20 00:00 |
23:35:58.62 |
-03:18:54.2 |
HIP 116520 |
24.26 |
| 2026-02-20 12:00 |
23:36:10.38 |
-03:17:29.3 |
HIP 116520 |
21.68 |
| 2026-02-21 00:00 |
23:36:22.16 |
-03:16:04.2 |
HIP 116520 |
19.31 |
| 2026-02-21 12:00 |
23:36:33.96 |
-03:14:39.0 |
HIP 116520 |
17.23 |
| 2026-02-22 00:00 |
23:36:45.79 |
-03:13:13.7 |
HIP 116520 |
15.56 |
| 2026-02-22 12:00 |
23:36:57.64 |
-03:11:48.2 |
HIP 116520 |
14.45 |
| 2026-02-23 00:00 |
23:37:09.52 |
-03:10:22.6 |
HIP 116520 |
14.03 |
| 2026-02-23 12:00 |
23:37:21.41 |
-03:08:56.9 |
HIP 116520 |
14.38 |
| 2026-02-24 00:00 |
23:37:33.33 |
-03:07:31.0 |
HIP 116520 |
15.45 |