| Parameter |
Value |
| Designation |
169P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-11-30T07:18:34.346880Z |
| Orbit solution date (soln_date, UTC) |
2025-05-08T09:42:28Z |
| Obs used |
1332 |
| NEO |
Yes |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-11-01.0000000 |
| e |
0.76678672 |
| q (au) |
0.607749 |
| a (au) |
2.605977 |
| i (deg) |
11.299757 |
| Ω (om, deg) |
176.191241 |
| ω (w, deg) |
217.958974 |
| M (ma, deg) |
353.134322 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.263 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.263 |
| n |
2.000 |
| gf |
0.945 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
7.550 |
| 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 |
18:42:49.16 |
-11:22:35.7 |
HIP 91847 |
10.68 |
| 2026-03-26 12:00 |
18:43:24.32 |
-11:19:42.7 |
HIP 91847 |
1.86 |
| 2026-03-27 00:00 |
18:43:59.39 |
-11:16:48.1 |
HIP 91847 |
7.62 |
| 2026-03-27 12:00 |
18:44:34.36 |
-11:13:52.1 |
HIP 92000 |
15.31 |
| 2026-03-28 00:00 |
18:45:09.23 |
-11:10:54.5 |
HIP 92000 |
16.43 |
| 2026-03-28 12:00 |
18:45:44.00 |
-11:07:55.4 |
HIP 92000 |
21.68 |
| 2026-03-29 00:00 |
18:46:18.67 |
-11:04:54.7 |
HIP 92179 |
15.68 |
| 2026-03-29 12:00 |
18:46:53.24 |
-11:01:52.5 |
HIP 92179 |
12.16 |
| 2026-03-30 00:00 |
18:47:27.70 |
-10:58:48.8 |
HIP 92179 |
14.58 |
| 2026-03-30 12:00 |
18:48:02.06 |
-10:55:43.5 |
HIP 92179 |
20.96 |
| 2026-03-31 00:00 |
18:48:36.31 |
-10:52:36.6 |
HIP 92453 |
28.57 |
| 2026-03-31 12:00 |
18:49:10.46 |
-10:49:28.2 |
HIP 92453 |
22.01 |
| 2026-04-01 00:00 |
18:49:44.50 |
-10:46:18.2 |
HIP 92453 |
17.71 |
| 2026-04-01 12:00 |
18:50:18.43 |
-10:43:06.6 |
HIP 92453 |
17.44 |
| 2026-04-02 00:00 |
18:50:52.25 |
-10:39:53.4 |
HIP 92453 |
21.31 |
| 2026-04-02 12:00 |
18:51:25.96 |
-10:36:38.6 |
HIP 92453 |
27.64 |
| 2026-04-03 00:00 |
18:51:59.56 |
-10:33:22.3 |
HIP 92694 |
27.31 |
| 2026-04-03 12:00 |
18:52:33.04 |
-10:30:04.3 |
HIP 92694 |
19.70 |
| 2026-04-04 00:00 |
18:53:06.41 |
-10:26:44.7 |
HIP 92694 |
13.68 |
| 2026-04-04 12:00 |
18:53:39.66 |
-10:23:23.5 |
HIP 92694 |
11.92 |
| 2026-04-05 00:00 |
18:54:12.80 |
-10:20:00.7 |
HIP 92838 |
15.04 |
| 2026-04-05 12:00 |
18:54:45.81 |
-10:16:36.2 |
HIP 92838 |
14.54 |
| 2026-04-06 00:00 |
18:55:18.71 |
-10:13:10.1 |
HIP 92838 |
18.76 |
| 2026-04-06 12:00 |
18:55:51.48 |
-10:09:42.4 |
HIP 92838 |
25.45 |
| 2026-04-07 00:00 |
18:56:24.13 |
-10:06:12.9 |
HIP 93076 |
18.38 |
| 2026-04-07 12:00 |
18:56:56.66 |
-10:02:41.9 |
HIP 93076 |
9.77 |
| 2026-04-08 00:00 |
18:57:29.06 |
-09:59:09.2 |
HIP 93076 |
2.44 |
| 2026-04-08 12:00 |
18:58:01.33 |
-09:55:34.7 |
HIP 93076 |
8.29 |
| 2026-04-09 00:00 |
18:58:33.47 |
-09:51:58.7 |
HIP 93076 |
16.83 |
| 2026-04-09 12:00 |
18:59:05.48 |
-09:48:20.9 |
HIP 93076 |
25.46 |
| 2026-04-10 00:00 |
18:59:37.36 |
-09:44:41.4 |
HIP 93076 |
34.10 |
| 2026-04-10 12:00 |
19:00:09.11 |
-09:41:00.3 |
HIP 93076 |
42.73 |
| 2026-04-11 00:00 |
19:00:40.71 |
-09:37:17.4 |
HIP 93208 |
45.30 |
| 2026-04-11 12:00 |
19:01:12.18 |
-09:33:32.8 |
HIP 93504 |
43.10 |
| 2026-04-12 00:00 |
19:01:43.51 |
-09:29:46.5 |
HIP 93504 |
36.45 |
| 2026-04-12 12:00 |
19:02:14.70 |
-09:25:58.5 |
HIP 93504 |
30.75 |
| 2026-04-13 00:00 |
19:02:45.74 |
-09:22:08.7 |
HIP 93504 |
26.61 |
| 2026-04-13 12:00 |
19:03:16.64 |
-09:18:17.2 |
HIP 93504 |
24.81 |
| 2026-04-14 00:00 |
19:03:47.40 |
-09:14:24.0 |
HIP 93504 |
25.82 |
| 2026-04-14 12:00 |
19:04:18.00 |
-09:10:29.0 |
HIP 93780 |
28.62 |
| 2026-04-15 00:00 |
19:04:48.45 |
-09:06:32.3 |
HIP 93780 |
20.20 |
| 2026-04-15 12:00 |
19:05:18.76 |
-09:02:33.8 |
HIP 93780 |
11.90 |
| 2026-04-16 00:00 |
19:05:48.90 |
-08:58:33.5 |
HIP 93780 |
4.29 |