| 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) |
| 2026-06-01 00:00 |
08:49:58.75 |
+03:29:52.6 |
HIP 43297 |
11.54 |
| 2026-06-01 12:00 |
08:50:19.10 |
+03:29:14.0 |
HIP 43297 |
16.59 |
| 2026-06-02 00:00 |
08:50:39.60 |
+03:28:34.2 |
HIP 43297 |
21.71 |
| 2026-06-02 12:00 |
08:51:00.25 |
+03:27:53.3 |
HIP 43297 |
26.88 |
| 2026-06-03 00:00 |
08:51:21.03 |
+03:27:11.3 |
HIP 43529 |
27.19 |
| 2026-06-03 12:00 |
08:51:41.97 |
+03:26:28.1 |
HIP 43529 |
25.26 |
| 2026-06-04 00:00 |
08:52:03.04 |
+03:25:43.8 |
HIP 43529 |
24.33 |
| 2026-06-04 12:00 |
08:52:24.25 |
+03:24:58.3 |
HIP 43529 |
24.53 |
| 2026-06-05 00:00 |
08:52:45.61 |
+03:24:11.6 |
HIP 43653 |
23.43 |
| 2026-06-05 12:00 |
08:53:07.10 |
+03:23:23.8 |
HIP 43653 |
20.42 |
| 2026-06-06 00:00 |
08:53:28.73 |
+03:22:34.8 |
HIP 43653 |
18.52 |
| 2026-06-06 12:00 |
08:53:50.50 |
+03:21:44.7 |
HIP 43653 |
18.12 |
| 2026-06-07 00:00 |
08:54:12.41 |
+03:20:53.5 |
HIP 43653 |
19.34 |
| 2026-06-07 12:00 |
08:54:34.45 |
+03:20:01.0 |
HIP 43653 |
21.94 |
| 2026-06-08 00:00 |
08:54:56.62 |
+03:19:07.5 |
HIP 43876 |
25.32 |
| 2026-06-08 12:00 |
08:55:18.93 |
+03:18:12.8 |
HIP 43876 |
21.74 |
| 2026-06-09 00:00 |
08:55:41.37 |
+03:17:16.9 |
HIP 43876 |
19.19 |
| 2026-06-09 12:00 |
08:56:03.95 |
+03:16:19.9 |
HIP 43876 |
18.13 |
| 2026-06-10 00:00 |
08:56:26.65 |
+03:15:21.7 |
HIP 43876 |
18.85 |
| 2026-06-10 12:00 |
08:56:49.48 |
+03:14:22.4 |
HIP 44016 |
18.89 |
| 2026-06-11 00:00 |
08:57:12.45 |
+03:13:21.9 |
HIP 44016 |
15.66 |
| 2026-06-11 12:00 |
08:57:35.54 |
+03:12:20.3 |
HIP 44016 |
14.19 |
| 2026-06-12 00:00 |
08:57:58.75 |
+03:11:17.5 |
HIP 44016 |
15.06 |
| 2026-06-12 12:00 |
08:58:22.10 |
+03:10:13.5 |
HIP 44016 |
17.97 |
| 2026-06-13 00:00 |
08:58:45.56 |
+03:09:08.5 |
HIP 44016 |
22.15 |
| 2026-06-13 12:00 |
08:59:09.16 |
+03:08:02.2 |
HIP 44016 |
27.04 |
| 2026-06-14 00:00 |
08:59:32.87 |
+03:06:54.8 |
HIP 44016 |
32.34 |
| 2026-06-14 12:00 |
08:59:56.71 |
+03:05:46.3 |
HIP 44363 |
33.81 |
| 2026-06-15 00:00 |
09:00:20.67 |
+03:04:36.6 |
HIP 44363 |
28.69 |
| 2026-06-15 12:00 |
09:00:44.75 |
+03:03:25.7 |
HIP 44363 |
24.03 |
| 2026-06-16 00:00 |
09:01:08.94 |
+03:02:13.7 |
HIP 44363 |
20.16 |
| 2026-06-16 12:00 |
09:01:33.26 |
+03:01:00.6 |
HIP 44363 |
17.64 |
| 2026-06-17 00:00 |
09:01:57.69 |
+02:59:46.3 |
HIP 44363 |
17.12 |
| 2026-06-17 12:00 |
09:02:22.24 |
+02:58:30.9 |
HIP 44363 |
18.80 |
| 2026-06-18 00:00 |
09:02:46.90 |
+02:57:14.3 |
HIP 44359 |
20.79 |
| 2026-06-18 12:00 |
09:03:11.67 |
+02:55:56.6 |
HIP 44518 |
16.68 |
| 2026-06-19 00:00 |
09:03:36.56 |
+02:54:37.7 |
HIP 44520 |
11.87 |
| 2026-06-19 12:00 |
09:04:01.56 |
+02:53:17.8 |
HIP 44520 |
8.96 |
| 2026-06-20 00:00 |
09:04:26.67 |
+02:51:56.7 |
HIP 44520 |
10.08 |
| 2026-06-20 12:00 |
09:04:51.89 |
+02:50:34.4 |
HIP 44595 |
6.98 |
| 2026-06-21 00:00 |
09:05:17.21 |
+02:49:11.0 |
HIP 44595 |
7.86 |
| 2026-06-21 12:00 |
09:05:42.64 |
+02:47:46.5 |
HIP 44595 |
12.63 |
| 2026-06-22 00:00 |
09:06:08.18 |
+02:46:20.9 |
HIP 44710 |
7.82 |