| Parameter |
Value |
| Designation |
163P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-02-01T10:29:57.131520Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T15:27:01Z |
| Obs used |
357 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
19.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-12-14.0000000 |
| e |
0.47586148 |
| q (au) |
1.929921 |
| a (au) |
3.682081 |
| i (deg) |
12.515433 |
| Ω (om, deg) |
103.284409 |
| ω (w, deg) |
348.176357 |
| M (ma, deg) |
94.936242 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.805 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.805 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.678 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-09-20 00:00 |
06:20:23.66 |
+15:31:28.5 |
HIP 30155 |
11.22 |
| 2026-09-20 12:00 |
06:21:17.17 |
+15:31:57.4 |
HIP 30155 |
12.67 |
| 2026-09-21 00:00 |
06:22:10.54 |
+15:32:25.8 |
HIP 30155 |
22.94 |
| 2026-09-21 12:00 |
06:23:03.78 |
+15:32:53.7 |
HIP 30363 |
17.69 |
| 2026-09-22 00:00 |
06:23:56.88 |
+15:33:21.2 |
HIP 30460 |
18.05 |
| 2026-09-22 12:00 |
06:24:49.84 |
+15:33:48.2 |
HIP 30460 |
19.54 |
| 2026-09-23 00:00 |
06:25:42.66 |
+15:34:14.7 |
HIP 30663 |
13.56 |
| 2026-09-23 12:00 |
06:26:35.34 |
+15:34:40.9 |
HIP 30663 |
3.31 |
| 2026-09-24 00:00 |
06:27:27.88 |
+15:35:06.6 |
HIP 30663 |
12.63 |
| 2026-09-24 12:00 |
06:28:20.27 |
+15:35:31.9 |
HIP 30663 |
25.04 |
| 2026-09-25 00:00 |
06:29:12.52 |
+15:35:56.9 |
HIP 30819 |
28.85 |
| 2026-09-25 12:00 |
06:30:04.62 |
+15:36:21.5 |
HIP 31098 |
24.04 |
| 2026-09-26 00:00 |
06:30:56.56 |
+15:36:45.8 |
HIP 31098 |
14.45 |
| 2026-09-26 12:00 |
06:31:48.36 |
+15:37:09.8 |
HIP 31164 |
9.37 |
| 2026-09-27 00:00 |
06:32:40.00 |
+15:37:33.4 |
HIP 31164 |
6.69 |
| 2026-09-27 12:00 |
06:33:31.48 |
+15:37:56.8 |
HIP 31164 |
17.60 |
| 2026-09-28 00:00 |
06:34:22.80 |
+15:38:19.9 |
HIP 31404 |
20.30 |
| 2026-09-28 12:00 |
06:35:13.97 |
+15:38:42.8 |
HIP 31574 |
19.09 |
| 2026-09-29 00:00 |
06:36:04.97 |
+15:39:05.4 |
HIP 31574 |
8.25 |
| 2026-09-29 12:00 |
06:36:55.81 |
+15:39:27.9 |
HIP 31574 |
8.54 |
| 2026-09-30 00:00 |
06:37:46.48 |
+15:39:50.1 |
HIP 31706 |
6.89 |
| 2026-09-30 12:00 |
06:38:36.98 |
+15:40:12.2 |
HIP 31706 |
11.54 |
| 2026-10-01 00:00 |
06:39:27.31 |
+15:40:34.1 |
HIP 31908 |
10.06 |
| 2026-10-01 12:00 |
06:40:17.46 |
+15:40:55.9 |
HIP 31908 |
3.88 |
| 2026-10-02 00:00 |
06:41:07.44 |
+15:41:17.6 |
HIP 31908 |
14.81 |
| 2026-10-02 12:00 |
06:41:57.24 |
+15:41:39.2 |
HIP 31908 |
26.66 |
| 2026-10-03 00:00 |
06:42:46.86 |
+15:42:00.7 |
HIP 32150 |
26.44 |
| 2026-10-03 12:00 |
06:43:36.30 |
+15:42:22.2 |
HIP 32150 |
28.19 |
| 2026-10-04 00:00 |
06:44:25.54 |
+15:42:43.7 |
HIP 32383 |
20.94 |
| 2026-10-04 12:00 |
06:45:14.60 |
+15:43:05.2 |
HIP 32383 |
14.79 |
| 2026-10-05 00:00 |
06:46:03.47 |
+15:43:26.7 |
HIP 32383 |
16.66 |
| 2026-10-05 12:00 |
06:46:52.14 |
+15:43:48.3 |
HIP 32447 |
22.12 |
| 2026-10-06 00:00 |
06:47:40.61 |
+15:44:09.9 |
HIP 32692 |
22.74 |
| 2026-10-06 12:00 |
06:48:28.89 |
+15:44:31.7 |
HIP 32692 |
11.12 |
| 2026-10-07 00:00 |
06:49:16.96 |
+15:44:53.5 |
HIP 32692 |
0.52 |
| 2026-10-07 12:00 |
06:50:04.82 |
+15:45:15.5 |
HIP 32692 |
11.99 |
| 2026-10-08 00:00 |
06:50:52.48 |
+15:45:37.7 |
HIP 32692 |
23.46 |
| 2026-10-08 12:00 |
06:51:39.93 |
+15:46:00.1 |
HIP 33039 |
21.01 |
| 2026-10-09 00:00 |
06:52:27.16 |
+15:46:22.8 |
HIP 33039 |
11.85 |
| 2026-10-09 12:00 |
06:53:14.18 |
+15:46:45.6 |
HIP 33039 |
9.89 |
| 2026-10-10 00:00 |
06:54:00.99 |
+15:47:08.8 |
HIP 33205 |
9.84 |
| 2026-10-10 12:00 |
06:54:47.57 |
+15:47:32.3 |
HIP 33205 |
3.32 |
| 2026-10-11 00:00 |
06:55:33.93 |
+15:47:56.1 |
HIP 33279 |
7.94 |