| 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) |
| 2026-03-26 00:00 |
08:34:39.70 |
+02:09:55.4 |
HIP 42186 |
22.57 |
| 2026-03-26 12:00 |
08:34:30.23 |
+02:11:31.6 |
HIP 42186 |
25.33 |
| 2026-03-27 00:00 |
08:34:21.03 |
+02:13:07.2 |
HIP 41915 |
24.46 |
| 2026-03-27 12:00 |
08:34:12.09 |
+02:14:42.3 |
HIP 41915 |
22.52 |
| 2026-03-28 00:00 |
08:34:03.43 |
+02:16:16.8 |
HIP 41915 |
20.82 |
| 2026-03-28 12:00 |
08:33:55.03 |
+02:17:50.8 |
HIP 41915 |
19.41 |
| 2026-03-29 00:00 |
08:33:46.91 |
+02:19:24.2 |
HIP 41915 |
18.32 |
| 2026-03-29 12:00 |
08:33:39.06 |
+02:20:56.9 |
HIP 41915 |
17.58 |
| 2026-03-30 00:00 |
08:33:31.47 |
+02:22:29.1 |
HIP 41915 |
17.21 |
| 2026-03-30 12:00 |
08:33:24.16 |
+02:24:00.6 |
HIP 41915 |
17.22 |
| 2026-03-31 00:00 |
08:33:17.12 |
+02:25:31.6 |
HIP 41915 |
17.57 |
| 2026-03-31 12:00 |
08:33:10.35 |
+02:27:01.8 |
HIP 41915 |
18.23 |
| 2026-04-01 00:00 |
08:33:03.85 |
+02:28:31.4 |
HIP 41915 |
19.15 |
| 2026-04-01 12:00 |
08:32:57.62 |
+02:30:00.4 |
HIP 41915 |
20.26 |
| 2026-04-02 00:00 |
08:32:51.66 |
+02:31:28.6 |
HIP 41915 |
21.53 |
| 2026-04-02 12:00 |
08:32:45.96 |
+02:32:56.2 |
HIP 41915 |
22.91 |
| 2026-04-03 00:00 |
08:32:40.54 |
+02:34:23.0 |
HIP 41915 |
24.36 |
| 2026-04-03 12:00 |
08:32:35.39 |
+02:35:49.2 |
HIP 41915 |
25.87 |
| 2026-04-04 00:00 |
08:32:30.51 |
+02:37:14.6 |
HIP 41915 |
27.41 |
| 2026-04-04 12:00 |
08:32:25.89 |
+02:38:39.3 |
HIP 41915 |
28.97 |
| 2026-04-05 00:00 |
08:32:21.55 |
+02:40:03.3 |
HIP 41915 |
30.53 |
| 2026-04-05 12:00 |
08:32:17.47 |
+02:41:26.4 |
HIP 41712 |
30.08 |
| 2026-04-06 00:00 |
08:32:13.66 |
+02:42:48.9 |
HIP 41712 |
28.77 |
| 2026-04-06 12:00 |
08:32:10.12 |
+02:44:10.5 |
HIP 41712 |
27.57 |
| 2026-04-07 00:00 |
08:32:06.85 |
+02:45:31.4 |
HIP 41712 |
26.48 |
| 2026-04-07 12:00 |
08:32:03.85 |
+02:46:51.5 |
HIP 41712 |
25.52 |
| 2026-04-08 00:00 |
08:32:01.11 |
+02:48:10.7 |
HIP 41712 |
24.67 |
| 2026-04-08 12:00 |
08:31:58.64 |
+02:49:29.2 |
HIP 41712 |
23.96 |
| 2026-04-09 00:00 |
08:31:56.43 |
+02:50:46.8 |
HIP 41712 |
23.39 |
| 2026-04-09 12:00 |
08:31:54.49 |
+02:52:03.6 |
HIP 41712 |
22.95 |
| 2026-04-10 00:00 |
08:31:52.82 |
+02:53:19.5 |
HIP 41712 |
22.65 |
| 2026-04-10 12:00 |
08:31:51.41 |
+02:54:34.6 |
HIP 41712 |
22.48 |
| 2026-04-11 00:00 |
08:31:50.26 |
+02:55:48.8 |
HIP 41712 |
22.45 |
| 2026-04-11 12:00 |
08:31:49.38 |
+02:57:02.2 |
HIP 41712 |
22.56 |
| 2026-04-12 00:00 |
08:31:48.76 |
+02:58:14.7 |
HIP 41712 |
22.78 |
| 2026-04-12 12:00 |
08:31:48.40 |
+02:59:26.2 |
HIP 41712 |
23.13 |
| 2026-04-13 00:00 |
08:31:48.31 |
+03:00:36.9 |
HIP 41712 |
23.58 |
| 2026-04-13 12:00 |
08:31:48.48 |
+03:01:46.7 |
HIP 41712 |
24.13 |
| 2026-04-14 00:00 |
08:31:48.90 |
+03:02:55.6 |
HIP 41712 |
24.78 |
| 2026-04-14 12:00 |
08:31:49.59 |
+03:04:03.5 |
HIP 41712 |
25.51 |
| 2026-04-15 00:00 |
08:31:50.54 |
+03:05:10.5 |
HIP 41712 |
26.31 |
| 2026-04-15 12:00 |
08:31:51.75 |
+03:06:16.5 |
HIP 41712 |
27.18 |
| 2026-04-16 00:00 |
08:31:53.21 |
+03:07:21.6 |
HIP 41712 |
28.11 |