169P/NEAT
| 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) |
| 2026-02-03 00:00 |
17:37:14.09 |
-14:13:54.7 |
HIP 86279 |
10.32 |
| 2026-02-03 12:00 |
17:37:54.59 |
-14:13:19.6 |
HIP 86279 |
6.20 |
| 2026-02-04 00:00 |
17:38:35.07 |
-14:12:43.4 |
HIP 86279 |
12.78 |
| 2026-02-04 12:00 |
17:39:15.54 |
-14:12:06.0 |
HIP 86279 |
21.94 |
| 2026-02-05 00:00 |
17:39:56.00 |
-14:11:27.3 |
HIP 86524 |
14.54 |
| 2026-02-05 12:00 |
17:40:36.44 |
-14:10:47.4 |
HIP 86524 |
6.29 |
| 2026-02-06 00:00 |
17:41:16.87 |
-14:10:06.3 |
HIP 86524 |
7.80 |
| 2026-02-06 12:00 |
17:41:57.29 |
-14:09:24.0 |
HIP 86524 |
16.59 |
| 2026-02-07 00:00 |
17:42:37.68 |
-14:08:40.5 |
HIP 86524 |
26.13 |
| 2026-02-07 12:00 |
17:43:18.06 |
-14:07:55.7 |
HIP 86524 |
35.82 |
| 2026-02-08 00:00 |
17:43:58.43 |
-14:07:09.7 |
HIP 86966 |
34.33 |
| 2026-02-08 12:00 |
17:44:38.77 |
-14:06:22.5 |
HIP 86966 |
24.52 |
| 2026-02-09 00:00 |
17:45:19.09 |
-14:05:34.0 |
HIP 86966 |
14.72 |
| 2026-02-09 12:00 |
17:45:59.40 |
-14:04:44.3 |
HIP 86966 |
4.93 |
| 2026-02-10 00:00 |
17:46:39.68 |
-14:03:53.4 |
HIP 86966 |
4.94 |
| 2026-02-10 12:00 |
17:47:19.94 |
-14:03:01.2 |
HIP 86966 |
14.72 |
| 2026-02-11 00:00 |
17:48:00.18 |
-14:02:07.7 |
HIP 86966 |
24.52 |
| 2026-02-11 12:00 |
17:48:40.39 |
-14:01:13.0 |
HIP 87288 |
24.89 |
| 2026-02-12 00:00 |
17:49:20.58 |
-14:00:17.0 |
HIP 87288 |
17.94 |
| 2026-02-12 12:00 |
17:50:00.75 |
-13:59:19.8 |
HIP 87288 |
14.70 |
| 2026-02-13 00:00 |
17:50:40.89 |
-13:58:21.3 |
HIP 87288 |
17.39 |
| 2026-02-13 12:00 |
17:51:21.00 |
-13:57:21.6 |
HIP 87468 |
22.72 |
| 2026-02-14 00:00 |
17:52:01.08 |
-13:56:20.5 |
HIP 87468 |
17.46 |
| 2026-02-14 12:00 |
17:52:41.14 |
-13:55:18.2 |
HIP 87468 |
16.86 |
| 2026-02-15 00:00 |
17:53:21.17 |
-13:54:14.7 |
HIP 87544 |
15.73 |
| 2026-02-15 12:00 |
17:54:01.16 |
-13:53:09.8 |
HIP 87544 |
19.65 |
| 2026-02-16 00:00 |
17:54:41.13 |
-13:52:03.7 |
HIP 87544 |
26.74 |
| 2026-02-16 12:00 |
17:55:21.06 |
-13:50:56.3 |
HIP 87879 |
28.29 |
| 2026-02-17 00:00 |
17:56:00.96 |
-13:49:47.6 |
HIP 87879 |
19.23 |
| 2026-02-17 12:00 |
17:56:40.82 |
-13:48:37.6 |
HIP 87879 |
11.38 |
| 2026-02-18 00:00 |
17:57:20.65 |
-13:47:26.4 |
HIP 87879 |
8.88 |
| 2026-02-18 12:00 |
17:58:00.45 |
-13:46:13.8 |
HIP 87879 |
14.76 |
| 2026-02-19 00:00 |
17:58:40.21 |
-13:45:00.0 |
HIP 87879 |
23.36 |
| 2026-02-19 12:00 |
17:59:19.93 |
-13:43:44.8 |
HIP 88201 |
20.55 |
| 2026-02-20 00:00 |
17:59:59.61 |
-13:42:28.4 |
HIP 88201 |
11.53 |
| 2026-02-20 12:00 |
18:00:39.26 |
-13:41:10.6 |
HIP 88201 |
5.73 |
| 2026-02-21 00:00 |
18:01:18.86 |
-13:39:51.6 |
HIP 88201 |
11.03 |
| 2026-02-21 12:00 |
18:01:58.42 |
-13:38:31.3 |
HIP 88201 |
19.98 |
| 2026-02-22 00:00 |
18:02:37.95 |
-13:37:09.6 |
HIP 88201 |
29.40 |
| 2026-02-22 12:00 |
18:03:17.43 |
-13:35:46.7 |
HIP 88301 |
33.35 |
| 2026-02-23 00:00 |
18:03:56.87 |
-13:34:22.4 |
HIP 88301 |
38.83 |
| 2026-02-23 12:00 |
18:04:36.26 |
-13:32:56.9 |
HIP 88748 |
40.18 |
| 2026-02-24 00:00 |
18:05:15.62 |
-13:31:30.0 |
HIP 88748 |
31.21 |