C/2002 P1 (NEAT)
| Parameter |
Value |
| Designation |
C/2002 P1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-11-23T03:57:52.277760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:18Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-10-24.0000000 |
| e |
0.98421998 |
| q (au) |
6.530244 |
| a (au) |
413.829798 |
| i (deg) |
34.606111 |
| Ω (om, deg) |
310.672601 |
| ω (w, deg) |
347.764743 |
| M (ma, deg) |
0.039201 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.523 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.523 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.776 |
| k |
0.800 |
| δ90 |
9.989 |
| 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 |
04:41:26.78 |
+51:43:40.8 |
HIP 21631 |
30.64 |
| 2026-02-03 12:00 |
04:41:24.96 |
+51:43:18.4 |
HIP 21631 |
30.62 |
| 2026-02-04 00:00 |
04:41:23.18 |
+51:42:55.9 |
HIP 21631 |
30.61 |
| 2026-02-04 12:00 |
04:41:21.44 |
+51:42:33.4 |
HIP 21631 |
30.62 |
| 2026-02-05 00:00 |
04:41:19.73 |
+51:42:10.8 |
HIP 21631 |
30.64 |
| 2026-02-05 12:00 |
04:41:18.07 |
+51:41:48.3 |
HIP 21631 |
30.67 |
| 2026-02-06 00:00 |
04:41:16.44 |
+51:41:25.6 |
HIP 21631 |
30.71 |
| 2026-02-06 12:00 |
04:41:14.85 |
+51:41:03.0 |
HIP 21631 |
30.76 |
| 2026-02-07 00:00 |
04:41:13.30 |
+51:40:40.3 |
HIP 21631 |
30.82 |
| 2026-02-07 12:00 |
04:41:11.78 |
+51:40:17.6 |
HIP 21631 |
30.90 |
| 2026-02-08 00:00 |
04:41:10.31 |
+51:39:54.8 |
HIP 21712 |
30.59 |
| 2026-02-08 12:00 |
04:41:08.87 |
+51:39:32.0 |
HIP 21712 |
30.15 |
| 2026-02-09 00:00 |
04:41:07.48 |
+51:39:09.2 |
HIP 21712 |
29.72 |
| 2026-02-09 12:00 |
04:41:06.12 |
+51:38:46.4 |
HIP 21712 |
29.28 |
| 2026-02-10 00:00 |
04:41:04.80 |
+51:38:23.6 |
HIP 21712 |
28.85 |
| 2026-02-10 12:00 |
04:41:03.52 |
+51:38:00.7 |
HIP 21712 |
28.42 |
| 2026-02-11 00:00 |
04:41:02.28 |
+51:37:37.9 |
HIP 21712 |
27.99 |
| 2026-02-11 12:00 |
04:41:01.08 |
+51:37:15.0 |
HIP 21712 |
27.57 |
| 2026-02-12 00:00 |
04:40:59.92 |
+51:36:52.1 |
HIP 21712 |
27.15 |
| 2026-02-12 12:00 |
04:40:58.80 |
+51:36:29.2 |
HIP 21712 |
26.73 |
| 2026-02-13 00:00 |
04:40:57.72 |
+51:36:06.3 |
HIP 21712 |
26.31 |
| 2026-02-13 12:00 |
04:40:56.67 |
+51:35:43.4 |
HIP 21712 |
25.90 |
| 2026-02-14 00:00 |
04:40:55.67 |
+51:35:20.5 |
HIP 21712 |
25.49 |
| 2026-02-14 12:00 |
04:40:54.71 |
+51:34:57.5 |
HIP 21712 |
25.08 |
| 2026-02-15 00:00 |
04:40:53.79 |
+51:34:34.6 |
HIP 21712 |
24.67 |
| 2026-02-15 12:00 |
04:40:52.90 |
+51:34:11.7 |
HIP 21712 |
24.27 |
| 2026-02-16 00:00 |
04:40:52.06 |
+51:33:48.8 |
HIP 21712 |
23.87 |
| 2026-02-16 12:00 |
04:40:51.26 |
+51:33:25.8 |
HIP 21712 |
23.47 |
| 2026-02-17 00:00 |
04:40:50.50 |
+51:33:02.9 |
HIP 21712 |
23.08 |
| 2026-02-17 12:00 |
04:40:49.78 |
+51:32:40.0 |
HIP 21712 |
22.69 |
| 2026-02-18 00:00 |
04:40:49.10 |
+51:32:17.1 |
HIP 21712 |
22.30 |
| 2026-02-18 12:00 |
04:40:48.46 |
+51:31:54.3 |
HIP 21712 |
21.92 |
| 2026-02-19 00:00 |
04:40:47.86 |
+51:31:31.4 |
HIP 21712 |
21.54 |
| 2026-02-19 12:00 |
04:40:47.30 |
+51:31:08.5 |
HIP 21712 |
21.16 |
| 2026-02-20 00:00 |
04:40:46.78 |
+51:30:45.7 |
HIP 21712 |
20.79 |
| 2026-02-20 12:00 |
04:40:46.30 |
+51:30:22.9 |
HIP 21712 |
20.42 |
| 2026-02-21 00:00 |
04:40:45.86 |
+51:30:00.1 |
HIP 21712 |
20.05 |
| 2026-02-21 12:00 |
04:40:45.47 |
+51:29:37.3 |
HIP 21712 |
19.69 |
| 2026-02-22 00:00 |
04:40:45.11 |
+51:29:14.6 |
HIP 21712 |
19.33 |
| 2026-02-22 12:00 |
04:40:44.79 |
+51:28:51.9 |
HIP 21712 |
18.98 |
| 2026-02-23 00:00 |
04:40:44.52 |
+51:28:29.2 |
HIP 21712 |
18.64 |
| 2026-02-23 12:00 |
04:40:44.28 |
+51:28:06.5 |
HIP 21712 |
18.29 |
| 2026-02-24 00:00 |
04:40:44.09 |
+51:27:43.9 |
HIP 21712 |
17.96 |