| 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 |
0.999 |
| gb |
-0.501 |
| 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) |
| 2026-07-29 00:00 |
05:09:09.17 |
+36:11:03.4 |
HIP 24184 |
32.28 |
| 2026-07-29 12:00 |
05:09:11.79 |
+36:11:11.8 |
HIP 24184 |
31.86 |
| 2026-07-30 00:00 |
05:09:14.40 |
+36:11:20.2 |
HIP 24184 |
31.45 |
| 2026-07-30 12:00 |
05:09:16.98 |
+36:11:28.7 |
HIP 24184 |
31.05 |
| 2026-07-31 00:00 |
05:09:19.55 |
+36:11:37.1 |
HIP 24184 |
30.65 |
| 2026-07-31 12:00 |
05:09:22.09 |
+36:11:45.6 |
HIP 24184 |
30.26 |
| 2026-08-01 00:00 |
05:09:24.61 |
+36:11:54.2 |
HIP 24184 |
29.88 |
| 2026-08-01 12:00 |
05:09:27.11 |
+36:12:02.7 |
HIP 24184 |
29.51 |
| 2026-08-02 00:00 |
05:09:29.59 |
+36:12:11.3 |
HIP 24184 |
29.15 |
| 2026-08-02 12:00 |
05:09:32.04 |
+36:12:20.0 |
HIP 24184 |
28.80 |
| 2026-08-03 00:00 |
05:09:34.47 |
+36:12:28.6 |
HIP 24184 |
28.45 |
| 2026-08-03 12:00 |
05:09:36.88 |
+36:12:37.3 |
HIP 24184 |
28.12 |
| 2026-08-04 00:00 |
05:09:39.27 |
+36:12:46.0 |
HIP 24184 |
27.79 |
| 2026-08-04 12:00 |
05:09:41.63 |
+36:12:54.7 |
HIP 24184 |
27.48 |
| 2026-08-05 00:00 |
05:09:43.97 |
+36:13:03.4 |
HIP 24184 |
27.17 |
| 2026-08-05 12:00 |
05:09:46.29 |
+36:13:12.2 |
HIP 24184 |
26.87 |
| 2026-08-06 00:00 |
05:09:48.58 |
+36:13:21.0 |
HIP 24184 |
26.59 |
| 2026-08-06 12:00 |
05:09:50.85 |
+36:13:29.8 |
HIP 24184 |
26.31 |
| 2026-08-07 00:00 |
05:09:53.10 |
+36:13:38.7 |
HIP 24184 |
26.04 |
| 2026-08-07 12:00 |
05:09:55.32 |
+36:13:47.5 |
HIP 24184 |
25.79 |
| 2026-08-08 00:00 |
05:09:57.52 |
+36:13:56.4 |
HIP 24184 |
25.54 |
| 2026-08-08 12:00 |
05:09:59.69 |
+36:14:05.3 |
HIP 24184 |
25.30 |
| 2026-08-09 00:00 |
05:10:01.84 |
+36:14:14.2 |
HIP 24184 |
25.08 |
| 2026-08-09 12:00 |
05:10:03.97 |
+36:14:23.2 |
HIP 24184 |
24.86 |
| 2026-08-10 00:00 |
05:10:06.07 |
+36:14:32.1 |
HIP 24184 |
24.66 |
| 2026-08-10 12:00 |
05:10:08.14 |
+36:14:41.1 |
HIP 24184 |
24.46 |
| 2026-08-11 00:00 |
05:10:10.19 |
+36:14:50.1 |
HIP 24184 |
24.28 |
| 2026-08-11 12:00 |
05:10:12.22 |
+36:14:59.1 |
HIP 24184 |
24.10 |
| 2026-08-12 00:00 |
05:10:14.22 |
+36:15:08.1 |
HIP 24184 |
23.94 |
| 2026-08-12 12:00 |
05:10:16.19 |
+36:15:17.2 |
HIP 24184 |
23.78 |
| 2026-08-13 00:00 |
05:10:18.14 |
+36:15:26.2 |
HIP 24184 |
23.64 |
| 2026-08-13 12:00 |
05:10:20.06 |
+36:15:35.3 |
HIP 24184 |
23.51 |
| 2026-08-14 00:00 |
05:10:21.96 |
+36:15:44.4 |
HIP 24184 |
23.38 |
| 2026-08-14 12:00 |
05:10:23.83 |
+36:15:53.5 |
HIP 24184 |
23.27 |
| 2026-08-15 00:00 |
05:10:25.67 |
+36:16:02.6 |
HIP 24184 |
23.17 |
| 2026-08-15 12:00 |
05:10:27.49 |
+36:16:11.7 |
HIP 24184 |
23.07 |
| 2026-08-16 00:00 |
05:10:29.28 |
+36:16:20.9 |
HIP 24184 |
22.99 |
| 2026-08-16 12:00 |
05:10:31.05 |
+36:16:30.0 |
HIP 24184 |
22.91 |
| 2026-08-17 00:00 |
05:10:32.79 |
+36:16:39.2 |
HIP 24184 |
22.85 |
| 2026-08-17 12:00 |
05:10:34.50 |
+36:16:48.3 |
HIP 24184 |
22.79 |
| 2026-08-18 00:00 |
05:10:36.18 |
+36:16:57.5 |
HIP 24184 |
22.75 |
| 2026-08-18 12:00 |
05:10:37.84 |
+36:17:06.7 |
HIP 24184 |
22.71 |
| 2026-08-19 00:00 |
05:10:39.47 |
+36:17:15.9 |
HIP 24184 |
22.68 |