| Parameter |
Value |
| Designation |
166P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2002-05-20T20:10:57.889920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:43Z |
| Obs used |
168 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-06-29.0000000 |
| e |
0.38310092 |
| q (au) |
8.564302 |
| a (au) |
13.882826 |
| i (deg) |
15.368401 |
| Ω (om, deg) |
64.488838 |
| ω (w, deg) |
321.878902 |
| M (ma, deg) |
7.700866 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.233 + 3.388\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.233 |
| n |
3.388 |
| gf |
0.990 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
13:32:57.07 |
+00:59:26.8 |
HIP 66140 |
8.12 |
| 2026-09-20 12:00 |
13:33:02.85 |
+00:58:42.4 |
HIP 66140 |
6.70 |
| 2026-09-21 00:00 |
13:33:08.64 |
+00:57:58.1 |
HIP 66140 |
5.40 |
| 2026-09-21 12:00 |
13:33:14.45 |
+00:57:13.7 |
HIP 66140 |
4.31 |
| 2026-09-22 00:00 |
13:33:20.28 |
+00:56:29.3 |
HIP 66140 |
3.66 |
| 2026-09-22 12:00 |
13:33:26.13 |
+00:55:45.0 |
HIP 66140 |
3.67 |
| 2026-09-23 00:00 |
13:33:31.99 |
+00:55:00.7 |
HIP 66140 |
4.35 |
| 2026-09-23 12:00 |
13:33:37.88 |
+00:54:16.4 |
HIP 66140 |
5.46 |
| 2026-09-24 00:00 |
13:33:43.78 |
+00:53:32.2 |
HIP 66140 |
6.79 |
| 2026-09-24 12:00 |
13:33:49.71 |
+00:52:47.9 |
HIP 66140 |
8.24 |
| 2026-09-25 00:00 |
13:33:55.64 |
+00:52:03.7 |
HIP 66140 |
9.76 |
| 2026-09-25 12:00 |
13:34:01.60 |
+00:51:19.5 |
HIP 66140 |
11.32 |
| 2026-09-26 00:00 |
13:34:07.57 |
+00:50:35.4 |
HIP 66140 |
12.91 |
| 2026-09-26 12:00 |
13:34:13.56 |
+00:49:51.3 |
HIP 66140 |
14.52 |
| 2026-09-27 00:00 |
13:34:19.57 |
+00:49:07.2 |
HIP 66140 |
16.14 |
| 2026-09-27 12:00 |
13:34:25.59 |
+00:48:23.2 |
HIP 66140 |
17.77 |
| 2026-09-28 00:00 |
13:34:31.62 |
+00:47:39.2 |
HIP 66197 |
18.75 |
| 2026-09-28 12:00 |
13:34:37.68 |
+00:46:55.2 |
HIP 66197 |
18.63 |
| 2026-09-29 00:00 |
13:34:43.74 |
+00:46:11.3 |
HIP 66197 |
18.67 |
| 2026-09-29 12:00 |
13:34:49.82 |
+00:45:27.5 |
HIP 66197 |
18.86 |
| 2026-09-30 00:00 |
13:34:55.92 |
+00:44:43.7 |
HIP 66197 |
19.20 |
| 2026-09-30 12:00 |
13:35:02.03 |
+00:44:00.0 |
HIP 66197 |
19.68 |
| 2026-10-01 00:00 |
13:35:08.16 |
+00:43:16.2 |
HIP 66197 |
20.30 |
| 2026-10-01 12:00 |
13:35:14.29 |
+00:42:32.6 |
HIP 66197 |
21.04 |
| 2026-10-02 00:00 |
13:35:20.45 |
+00:41:49.0 |
HIP 66197 |
21.88 |
| 2026-10-02 12:00 |
13:35:26.61 |
+00:41:05.4 |
HIP 66197 |
22.83 |
| 2026-10-03 00:00 |
13:35:32.79 |
+00:40:22.0 |
HIP 66197 |
23.87 |
| 2026-10-03 12:00 |
13:35:38.98 |
+00:39:38.6 |
HIP 66197 |
24.98 |
| 2026-10-04 00:00 |
13:35:45.18 |
+00:38:55.2 |
HIP 66197 |
26.16 |
| 2026-10-04 12:00 |
13:35:51.39 |
+00:38:11.9 |
HIP 66197 |
27.40 |
| 2026-10-05 00:00 |
13:35:57.62 |
+00:37:28.7 |
HIP 66197 |
28.69 |
| 2026-10-05 12:00 |
13:36:03.85 |
+00:36:45.6 |
HIP 66197 |
30.02 |
| 2026-10-06 00:00 |
13:36:10.10 |
+00:36:02.5 |
HIP 66197 |
31.40 |
| 2026-10-06 12:00 |
13:36:16.36 |
+00:35:19.5 |
HIP 66197 |
32.81 |
| 2026-10-07 00:00 |
13:36:22.62 |
+00:34:36.6 |
HIP 66197 |
34.25 |
| 2026-10-07 12:00 |
13:36:28.90 |
+00:33:53.8 |
HIP 66197 |
35.72 |
| 2026-10-08 00:00 |
13:36:35.19 |
+00:33:11.1 |
HIP 66197 |
37.21 |
| 2026-10-08 12:00 |
13:36:41.48 |
+00:32:28.4 |
HIP 66197 |
38.73 |
| 2026-10-09 00:00 |
13:36:47.79 |
+00:31:45.8 |
HIP 66197 |
40.26 |
| 2026-10-09 12:00 |
13:36:54.10 |
+00:31:03.4 |
HIP 66197 |
41.82 |
| 2026-10-10 00:00 |
13:37:00.42 |
+00:30:21.0 |
HIP 66197 |
43.38 |
| 2026-10-10 12:00 |
13:37:06.75 |
+00:29:38.7 |
HIP 66460 |
43.34 |
| 2026-10-11 00:00 |
13:37:13.08 |
+00:28:56.5 |
HIP 66460 |
42.45 |