| Parameter |
Value |
| Designation |
C/2004 P1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-08-08T17:39:35.953920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:42Z |
| Obs used |
148 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
6.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-09-09.0000000 |
| e |
0.99925569 |
| q (au) |
6.013775 |
| a (au) |
8079.698737 |
| i (deg) |
28.816238 |
| Ω (om, deg) |
284.183334 |
| ω (w, deg) |
16.584545 |
| M (ma, deg) |
0.000539 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.537 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.537 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-0.507 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:55:59.92 |
+36:09:23.8 |
HIP 22955 |
4.13 |
| 2026-03-26 12:00 |
04:56:01.42 |
+36:09:14.3 |
HIP 22955 |
3.87 |
| 2026-03-27 00:00 |
04:56:02.95 |
+36:09:05.0 |
HIP 22955 |
3.61 |
| 2026-03-27 12:00 |
04:56:04.52 |
+36:08:55.7 |
HIP 22955 |
3.36 |
| 2026-03-28 00:00 |
04:56:06.11 |
+36:08:46.4 |
HIP 22955 |
3.12 |
| 2026-03-28 12:00 |
04:56:07.72 |
+36:08:37.3 |
HIP 22955 |
2.91 |
| 2026-03-29 00:00 |
04:56:09.37 |
+36:08:28.2 |
HIP 22955 |
2.72 |
| 2026-03-29 12:00 |
04:56:11.05 |
+36:08:19.2 |
HIP 22955 |
2.56 |
| 2026-03-30 00:00 |
04:56:12.75 |
+36:08:10.2 |
HIP 22955 |
2.44 |
| 2026-03-30 12:00 |
04:56:14.48 |
+36:08:01.4 |
HIP 22955 |
2.38 |
| 2026-03-31 00:00 |
04:56:16.23 |
+36:07:52.6 |
HIP 22955 |
2.37 |
| 2026-03-31 12:00 |
04:56:18.02 |
+36:07:43.9 |
HIP 22955 |
2.42 |
| 2026-04-01 00:00 |
04:56:19.83 |
+36:07:35.2 |
HIP 22955 |
2.53 |
| 2026-04-01 12:00 |
04:56:21.66 |
+36:07:26.7 |
HIP 22955 |
2.69 |
| 2026-04-02 00:00 |
04:56:23.53 |
+36:07:18.2 |
HIP 22955 |
2.89 |
| 2026-04-02 12:00 |
04:56:25.42 |
+36:07:09.8 |
HIP 22955 |
3.14 |
| 2026-04-03 00:00 |
04:56:27.34 |
+36:07:01.5 |
HIP 22982 |
3.23 |
| 2026-04-03 12:00 |
04:56:29.28 |
+36:06:53.2 |
HIP 22982 |
2.85 |
| 2026-04-04 00:00 |
04:56:31.25 |
+36:06:45.0 |
HIP 22982 |
2.48 |
| 2026-04-04 12:00 |
04:56:33.25 |
+36:06:36.9 |
HIP 22982 |
2.11 |
| 2026-04-05 00:00 |
04:56:35.27 |
+36:06:28.9 |
HIP 22982 |
1.77 |
| 2026-04-05 12:00 |
04:56:37.32 |
+36:06:21.0 |
HIP 22982 |
1.48 |
| 2026-04-06 00:00 |
04:56:39.39 |
+36:06:13.1 |
HIP 22982 |
1.26 |
| 2026-04-06 12:00 |
04:56:41.49 |
+36:06:05.4 |
HIP 22982 |
1.16 |
| 2026-04-07 00:00 |
04:56:43.62 |
+36:05:57.7 |
HIP 22982 |
1.23 |
| 2026-04-07 12:00 |
04:56:45.77 |
+36:05:50.1 |
HIP 22982 |
1.44 |
| 2026-04-08 00:00 |
04:56:47.95 |
+36:05:42.5 |
HIP 22982 |
1.75 |
| 2026-04-08 12:00 |
04:56:50.15 |
+36:05:35.1 |
HIP 22982 |
2.12 |
| 2026-04-09 00:00 |
04:56:52.37 |
+36:05:27.7 |
HIP 22982 |
2.52 |
| 2026-04-09 12:00 |
04:56:54.62 |
+36:05:20.4 |
HIP 22982 |
2.94 |
| 2026-04-10 00:00 |
04:56:56.90 |
+36:05:13.2 |
HIP 22982 |
3.38 |
| 2026-04-10 12:00 |
04:56:59.20 |
+36:05:06.1 |
HIP 22982 |
3.83 |
| 2026-04-11 00:00 |
04:57:01.52 |
+36:04:59.0 |
HIP 22982 |
4.29 |
| 2026-04-11 12:00 |
04:57:03.87 |
+36:04:52.1 |
HIP 22982 |
4.76 |
| 2026-04-12 00:00 |
04:57:06.24 |
+36:04:45.2 |
HIP 22982 |
5.23 |
| 2026-04-12 12:00 |
04:57:08.64 |
+36:04:38.4 |
HIP 22982 |
5.71 |
| 2026-04-13 00:00 |
04:57:11.06 |
+36:04:31.7 |
HIP 22982 |
6.20 |
| 2026-04-13 12:00 |
04:57:13.50 |
+36:04:25.1 |
HIP 22982 |
6.70 |
| 2026-04-14 00:00 |
04:57:15.97 |
+36:04:18.5 |
HIP 22982 |
7.20 |
| 2026-04-14 12:00 |
04:57:18.45 |
+36:04:12.1 |
HIP 22982 |
7.70 |
| 2026-04-15 00:00 |
04:57:20.97 |
+36:04:05.7 |
HIP 22982 |
8.21 |
| 2026-04-15 12:00 |
04:57:23.50 |
+36:03:59.4 |
HIP 22982 |
8.72 |
| 2026-04-16 00:00 |
04:57:26.06 |
+36:03:53.2 |
HIP 22982 |
9.24 |