| Parameter |
Value |
| Designation |
189P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-07-25T22:31:20.040960Z |
| Orbit solution date (soln_date, UTC) |
2022-08-26T23:43:11Z |
| Obs used |
1469 |
| NEO |
Yes |
| M1 |
19.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-12-04.0000000 |
| e |
0.59764285 |
| q (au) |
1.173925 |
| a (au) |
2.917619 |
| i (deg) |
20.400629 |
| Ω (om, deg) |
282.200061 |
| ω (w, deg) |
15.307418 |
| M (ma, deg) |
98.304051 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.737 + 2.780\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.737 |
| n |
2.780 |
| gf |
1.000 |
| gb |
-0.866 |
| k |
0.800 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
10:40:48.37 |
-06:10:01.6 |
HIP 52347 |
29.36 |
| 2026-09-20 12:00 |
10:41:23.21 |
-06:14:24.2 |
HIP 52347 |
21.47 |
| 2026-09-21 00:00 |
10:41:58.05 |
-06:18:47.7 |
HIP 52347 |
15.73 |
| 2026-09-21 12:00 |
10:42:32.91 |
-06:23:11.9 |
HIP 52347 |
14.91 |
| 2026-09-22 00:00 |
10:43:07.77 |
-06:27:37.0 |
HIP 52347 |
19.63 |
| 2026-09-22 12:00 |
10:43:42.65 |
-06:32:02.8 |
HIP 52347 |
27.16 |
| 2026-09-23 00:00 |
10:44:17.54 |
-06:36:29.4 |
HIP 52654 |
27.39 |
| 2026-09-23 12:00 |
10:44:52.44 |
-06:40:56.9 |
HIP 52654 |
21.86 |
| 2026-09-24 00:00 |
10:45:27.35 |
-06:45:25.1 |
HIP 52654 |
19.90 |
| 2026-09-24 12:00 |
10:46:02.27 |
-06:49:54.2 |
HIP 52682 |
12.11 |
| 2026-09-25 00:00 |
10:46:37.20 |
-06:54:24.0 |
HIP 52682 |
8.17 |
| 2026-09-25 12:00 |
10:47:12.14 |
-06:58:54.7 |
HIP 52682 |
13.32 |
| 2026-09-26 00:00 |
10:47:47.09 |
-07:03:26.1 |
HIP 52682 |
21.90 |
| 2026-09-26 12:00 |
10:48:22.05 |
-07:07:58.3 |
HIP 52933 |
27.83 |
| 2026-09-27 00:00 |
10:48:57.02 |
-07:12:31.4 |
HIP 52968 |
22.42 |
| 2026-09-27 12:00 |
10:49:31.99 |
-07:17:05.2 |
HIP 52968 |
13.56 |
| 2026-09-28 00:00 |
10:50:06.98 |
-07:21:39.8 |
HIP 52968 |
7.57 |
| 2026-09-28 12:00 |
10:50:41.97 |
-07:26:15.2 |
HIP 52968 |
11.08 |
| 2026-09-29 00:00 |
10:51:16.98 |
-07:30:51.4 |
HIP 52968 |
19.52 |
| 2026-09-29 12:00 |
10:51:51.99 |
-07:35:28.4 |
HIP 53090 |
28.85 |
| 2026-09-30 00:00 |
10:52:27.00 |
-07:40:06.2 |
HIP 53090 |
26.65 |
| 2026-09-30 12:00 |
10:53:02.03 |
-07:44:44.7 |
HIP 53090 |
27.95 |
| 2026-10-01 00:00 |
10:53:37.06 |
-07:49:24.1 |
HIP 53400 |
28.78 |
| 2026-10-01 12:00 |
10:54:12.10 |
-07:54:04.3 |
HIP 53400 |
24.65 |
| 2026-10-02 00:00 |
10:54:47.15 |
-07:58:45.2 |
HIP 53364 |
23.98 |
| 2026-10-02 12:00 |
10:55:22.20 |
-08:03:26.9 |
HIP 53364 |
21.30 |
| 2026-10-03 00:00 |
10:55:57.26 |
-08:08:09.4 |
HIP 53364 |
22.95 |
| 2026-10-03 12:00 |
10:56:32.32 |
-08:12:52.7 |
HIP 53575 |
16.76 |
| 2026-10-04 00:00 |
10:57:07.39 |
-08:17:36.8 |
HIP 53575 |
7.53 |
| 2026-10-04 12:00 |
10:57:42.46 |
-08:22:21.6 |
HIP 53575 |
5.29 |
| 2026-10-05 00:00 |
10:58:17.54 |
-08:27:07.2 |
HIP 53575 |
13.97 |
| 2026-10-05 12:00 |
10:58:52.62 |
-08:31:53.6 |
HIP 53671 |
19.30 |
| 2026-10-06 00:00 |
10:59:27.70 |
-08:36:40.8 |
HIP 53671 |
16.94 |
| 2026-10-06 12:00 |
11:00:02.79 |
-08:41:28.8 |
HIP 53671 |
19.93 |
| 2026-10-07 00:00 |
11:00:37.88 |
-08:46:17.5 |
HIP 53671 |
26.53 |
| 2026-10-07 12:00 |
11:01:12.97 |
-08:51:07.0 |
HIP 53671 |
34.74 |
| 2026-10-08 00:00 |
11:01:48.07 |
-08:55:57.2 |
HIP 54002 |
28.37 |
| 2026-10-08 12:00 |
11:02:23.16 |
-09:00:48.2 |
HIP 54002 |
20.15 |
| 2026-10-09 00:00 |
11:02:58.26 |
-09:05:40.0 |
HIP 54002 |
14.28 |
| 2026-10-09 12:00 |
11:03:33.35 |
-09:10:32.5 |
HIP 54078 |
8.17 |
| 2026-10-10 00:00 |
11:04:08.44 |
-09:15:25.8 |
HIP 54078 |
10.94 |
| 2026-10-10 12:00 |
11:04:43.54 |
-09:20:19.8 |
HIP 54078 |
19.25 |
| 2026-10-11 00:00 |
11:05:18.63 |
-09:25:14.5 |
HIP 54078 |
28.64 |