| Parameter |
Value |
| Designation |
169P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-11-30T07:18:36.377280Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:25Z |
| Obs used |
1362 |
| NEO |
Yes |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-03-21.0000000 |
| e |
0.76678939 |
| q (au) |
0.607753 |
| a (au) |
2.606026 |
| i (deg) |
11.301084 |
| Ω (om, deg) |
176.181237 |
| ω (w, deg) |
217.968661 |
| M (ma, deg) |
25.933759 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.527 + 4.907\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.527 |
| n |
4.907 |
| gf |
1.000 |
| gb |
-0.906 |
| 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 |
19:36:13.80 |
-00:15:37.9 |
HIP 96379 |
7.33 |
| 2026-06-01 12:00 |
19:36:18.75 |
-00:07:46.7 |
HIP 96379 |
10.73 |
| 2026-06-02 00:00 |
19:36:23.24 |
+00:00:08.4 |
HIP 96402 |
7.80 |
| 2026-06-02 12:00 |
19:36:27.26 |
+00:08:07.3 |
HIP 96402 |
7.14 |
| 2026-06-03 00:00 |
19:36:30.80 |
+00:16:10.1 |
HIP 96403 |
7.55 |
| 2026-06-03 12:00 |
19:36:33.86 |
+00:24:16.9 |
HIP 96403 |
12.41 |
| 2026-06-04 00:00 |
19:36:36.43 |
+00:32:27.7 |
HIP 96403 |
19.60 |
| 2026-06-04 12:00 |
19:36:38.50 |
+00:40:42.6 |
HIP 96312 |
25.17 |
| 2026-06-05 00:00 |
19:36:40.07 |
+00:49:01.6 |
HIP 96312 |
27.81 |
| 2026-06-05 12:00 |
19:36:41.12 |
+00:57:24.8 |
HIP 96312 |
32.38 |
| 2026-06-06 00:00 |
19:36:41.65 |
+01:05:52.2 |
HIP 96567 |
30.03 |
| 2026-06-06 12:00 |
19:36:41.65 |
+01:14:23.9 |
HIP 96567 |
23.74 |
| 2026-06-07 00:00 |
19:36:41.11 |
+01:23:00.0 |
HIP 96567 |
19.37 |
| 2026-06-07 12:00 |
19:36:40.02 |
+01:31:40.4 |
HIP 96567 |
18.42 |
| 2026-06-08 00:00 |
19:36:38.37 |
+01:40:25.3 |
HIP 96378 |
14.07 |
| 2026-06-08 12:00 |
19:36:36.16 |
+01:49:14.7 |
HIP 96378 |
14.23 |
| 2026-06-09 00:00 |
19:36:33.37 |
+01:58:08.8 |
HIP 96378 |
19.03 |
| 2026-06-09 12:00 |
19:36:29.99 |
+02:07:07.4 |
HIP 96378 |
26.10 |
| 2026-06-10 00:00 |
19:36:26.03 |
+02:16:10.8 |
HIP 96378 |
34.13 |
| 2026-06-10 12:00 |
19:36:21.45 |
+02:25:19.0 |
HIP 96351 |
32.68 |
| 2026-06-11 00:00 |
19:36:16.26 |
+02:34:32.0 |
HIP 96351 |
23.96 |
| 2026-06-11 12:00 |
19:36:10.45 |
+02:43:49.9 |
HIP 96351 |
15.77 |
| 2026-06-12 00:00 |
19:36:04.00 |
+02:53:12.7 |
HIP 96351 |
9.84 |
| 2026-06-12 12:00 |
19:35:56.91 |
+03:02:40.6 |
HIP 96351 |
11.17 |
| 2026-06-13 00:00 |
19:35:49.16 |
+03:12:13.7 |
HIP 96464 |
16.15 |
| 2026-06-13 12:00 |
19:35:40.74 |
+03:21:51.9 |
HIP 96464 |
24.35 |
| 2026-06-14 00:00 |
19:35:31.65 |
+03:31:35.4 |
HIP 96196 |
31.90 |
| 2026-06-14 12:00 |
19:35:21.87 |
+03:41:24.2 |
HIP 96196 |
26.53 |
| 2026-06-15 00:00 |
19:35:11.39 |
+03:51:18.5 |
HIP 96421 |
21.88 |
| 2026-06-15 12:00 |
19:35:00.20 |
+04:01:18.3 |
HIP 96318 |
17.38 |
| 2026-06-16 00:00 |
19:34:48.29 |
+04:11:23.7 |
HIP 96318 |
8.03 |
| 2026-06-16 12:00 |
19:34:35.65 |
+04:21:34.8 |
HIP 96318 |
7.14 |
| 2026-06-17 00:00 |
19:34:22.26 |
+04:31:51.7 |
HIP 96285 |
5.27 |
| 2026-06-17 12:00 |
19:34:08.12 |
+04:42:14.5 |
HIP 96285 |
10.73 |
| 2026-06-18 00:00 |
19:33:53.21 |
+04:52:43.3 |
HIP 96159 |
14.49 |
| 2026-06-18 12:00 |
19:33:37.52 |
+05:03:18.2 |
HIP 96159 |
7.57 |
| 2026-06-19 00:00 |
19:33:21.03 |
+05:13:59.3 |
HIP 96159 |
12.66 |
| 2026-06-19 12:00 |
19:33:03.74 |
+05:24:46.8 |
HIP 96204 |
10.99 |
| 2026-06-20 00:00 |
19:32:45.63 |
+05:35:40.8 |
HIP 96079 |
11.85 |
| 2026-06-20 12:00 |
19:32:26.68 |
+05:46:41.3 |
HIP 96047 |
10.83 |
| 2026-06-21 00:00 |
19:32:06.88 |
+05:57:48.5 |
HIP 96135 |
11.33 |
| 2026-06-21 12:00 |
19:31:46.22 |
+06:09:02.6 |
HIP 96135 |
17.67 |
| 2026-06-22 00:00 |
19:31:24.67 |
+06:20:23.7 |
HIP 96093 |
23.76 |