166P/NEAT
| 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
$$
M_a = (6.234 + 3.388\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.234 |
| n |
3.388 |
| gf |
0.964 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:41:44.74 |
+01:18:07.4 |
HIP 66872 |
14.90 |
| 2026-02-03 12:00 |
13:41:44.03 |
+01:18:26.5 |
HIP 66872 |
14.74 |
| 2026-02-04 00:00 |
13:41:43.26 |
+01:18:45.8 |
HIP 66872 |
14.60 |
| 2026-02-04 12:00 |
13:41:42.45 |
+01:19:05.4 |
HIP 66872 |
14.47 |
| 2026-02-05 00:00 |
13:41:41.58 |
+01:19:25.2 |
HIP 66872 |
14.36 |
| 2026-02-05 12:00 |
13:41:40.67 |
+01:19:45.3 |
HIP 66872 |
14.26 |
| 2026-02-06 00:00 |
13:41:39.70 |
+01:20:05.6 |
HIP 66872 |
14.17 |
| 2026-02-06 12:00 |
13:41:38.69 |
+01:20:26.2 |
HIP 66872 |
14.11 |
| 2026-02-07 00:00 |
13:41:37.62 |
+01:20:47.0 |
HIP 66872 |
14.06 |
| 2026-02-07 12:00 |
13:41:36.51 |
+01:21:08.0 |
HIP 66872 |
14.04 |
| 2026-02-08 00:00 |
13:41:35.34 |
+01:21:29.3 |
HIP 66872 |
14.03 |
| 2026-02-08 12:00 |
13:41:34.12 |
+01:21:50.8 |
HIP 66872 |
14.05 |
| 2026-02-09 00:00 |
13:41:32.86 |
+01:22:12.5 |
HIP 66872 |
14.10 |
| 2026-02-09 12:00 |
13:41:31.55 |
+01:22:34.4 |
HIP 66872 |
14.16 |
| 2026-02-10 00:00 |
13:41:30.18 |
+01:22:56.6 |
HIP 66872 |
14.25 |
| 2026-02-10 12:00 |
13:41:28.77 |
+01:23:19.0 |
HIP 66872 |
14.37 |
| 2026-02-11 00:00 |
13:41:27.31 |
+01:23:41.6 |
HIP 66872 |
14.52 |
| 2026-02-11 12:00 |
13:41:25.79 |
+01:24:04.4 |
HIP 66872 |
14.69 |
| 2026-02-12 00:00 |
13:41:24.23 |
+01:24:27.5 |
HIP 66872 |
14.89 |
| 2026-02-12 12:00 |
13:41:22.62 |
+01:24:50.7 |
HIP 66872 |
15.11 |
| 2026-02-13 00:00 |
13:41:20.97 |
+01:25:14.2 |
HIP 66872 |
15.37 |
| 2026-02-13 12:00 |
13:41:19.26 |
+01:25:37.9 |
HIP 66872 |
15.65 |
| 2026-02-14 00:00 |
13:41:17.51 |
+01:26:01.8 |
HIP 66872 |
15.96 |
| 2026-02-14 12:00 |
13:41:15.70 |
+01:26:25.8 |
HIP 66872 |
16.29 |
| 2026-02-15 00:00 |
13:41:13.85 |
+01:26:50.1 |
HIP 66872 |
16.65 |
| 2026-02-15 12:00 |
13:41:11.95 |
+01:27:14.6 |
HIP 66872 |
17.04 |
| 2026-02-16 00:00 |
13:41:10.01 |
+01:27:39.3 |
HIP 66872 |
17.45 |
| 2026-02-16 12:00 |
13:41:08.01 |
+01:28:04.1 |
HIP 66872 |
17.88 |
| 2026-02-17 00:00 |
13:41:05.97 |
+01:28:29.2 |
HIP 66872 |
18.34 |
| 2026-02-17 12:00 |
13:41:03.88 |
+01:28:54.4 |
HIP 66872 |
18.83 |
| 2026-02-18 00:00 |
13:41:01.75 |
+01:29:19.8 |
HIP 66872 |
19.33 |
| 2026-02-18 12:00 |
13:40:59.57 |
+01:29:45.4 |
HIP 66872 |
19.86 |
| 2026-02-19 00:00 |
13:40:57.34 |
+01:30:11.2 |
HIP 66872 |
20.41 |
| 2026-02-19 12:00 |
13:40:55.06 |
+01:30:37.2 |
HIP 66872 |
20.98 |
| 2026-02-20 00:00 |
13:40:52.74 |
+01:31:03.3 |
HIP 66872 |
21.57 |
| 2026-02-20 12:00 |
13:40:50.38 |
+01:31:29.6 |
HIP 66872 |
22.18 |
| 2026-02-21 00:00 |
13:40:47.97 |
+01:31:56.0 |
HIP 66872 |
22.81 |
| 2026-02-21 12:00 |
13:40:45.51 |
+01:32:22.7 |
HIP 66872 |
23.46 |
| 2026-02-22 00:00 |
13:40:43.01 |
+01:32:49.4 |
HIP 66872 |
24.12 |
| 2026-02-22 12:00 |
13:40:40.47 |
+01:33:16.4 |
HIP 66872 |
24.80 |
| 2026-02-23 00:00 |
13:40:37.88 |
+01:33:43.5 |
HIP 66872 |
25.50 |
| 2026-02-23 12:00 |
13:40:35.24 |
+01:34:10.7 |
HIP 66872 |
26.22 |
| 2026-02-24 00:00 |
13:40:32.57 |
+01:34:38.1 |
HIP 66872 |
26.95 |