| Parameter |
Value |
| Designation |
212P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-12-03T05:58:31.068480Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:03Z |
| Obs used |
154 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-01-04.0000000 |
| e |
0.57896629 |
| q (au) |
1.652279 |
| a (au) |
3.924338 |
| i (deg) |
22.407036 |
| Ω (om, deg) |
98.910032 |
| ω (w, deg) |
14.977137 |
| M (ma, deg) |
96.575628 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.364 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.364 |
| n |
6.000 |
| gf |
0.804 |
| gb |
-1.000 |
| k |
0.982 |
| δ90 |
1.420 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
17:12:51.63 |
-19:28:43.2 |
HIP 84344 |
27.34 |
| 2026-09-20 12:00 |
17:13:01.31 |
-19:29:46.6 |
HIP 84344 |
25.67 |
| 2026-09-21 00:00 |
17:13:11.15 |
-19:30:50.0 |
HIP 84344 |
24.13 |
| 2026-09-21 12:00 |
17:13:21.14 |
-19:31:53.4 |
HIP 84344 |
22.74 |
| 2026-09-22 00:00 |
17:13:31.29 |
-19:32:56.6 |
HIP 84344 |
21.54 |
| 2026-09-22 12:00 |
17:13:41.59 |
-19:33:59.9 |
HIP 84344 |
20.57 |
| 2026-09-23 00:00 |
17:13:52.04 |
-19:35:03.0 |
HIP 84344 |
19.90 |
| 2026-09-23 12:00 |
17:14:02.65 |
-19:36:06.1 |
HIP 84344 |
19.56 |
| 2026-09-24 00:00 |
17:14:13.41 |
-19:37:09.2 |
HIP 84367 |
17.43 |
| 2026-09-24 12:00 |
17:14:24.32 |
-19:38:12.1 |
HIP 84367 |
15.24 |
| 2026-09-25 00:00 |
17:14:35.38 |
-19:39:15.0 |
HIP 84367 |
13.26 |
| 2026-09-25 12:00 |
17:14:46.59 |
-19:40:17.8 |
HIP 84367 |
11.62 |
| 2026-09-26 00:00 |
17:14:57.94 |
-19:41:20.6 |
HIP 84367 |
10.51 |
| 2026-09-26 12:00 |
17:15:09.45 |
-19:42:23.2 |
HIP 84367 |
10.13 |
| 2026-09-27 00:00 |
17:15:21.10 |
-19:43:25.8 |
HIP 84367 |
10.58 |
| 2026-09-27 12:00 |
17:15:32.89 |
-19:44:28.3 |
HIP 84367 |
11.80 |
| 2026-09-28 00:00 |
17:15:44.83 |
-19:45:30.7 |
HIP 84367 |
13.60 |
| 2026-09-28 12:00 |
17:15:56.91 |
-19:46:33.0 |
HIP 84367 |
15.80 |
| 2026-09-29 00:00 |
17:16:09.14 |
-19:47:35.2 |
HIP 84367 |
18.27 |
| 2026-09-29 12:00 |
17:16:21.51 |
-19:48:37.3 |
HIP 84367 |
20.93 |
| 2026-09-30 00:00 |
17:16:34.01 |
-19:49:39.3 |
HIP 84367 |
23.72 |
| 2026-09-30 12:00 |
17:16:46.66 |
-19:50:41.2 |
HIP 84367 |
26.62 |
| 2026-10-01 00:00 |
17:16:59.45 |
-19:51:43.1 |
HIP 84367 |
29.60 |
| 2026-10-01 12:00 |
17:17:12.38 |
-19:52:44.8 |
HIP 84367 |
32.65 |
| 2026-10-02 00:00 |
17:17:25.45 |
-19:53:46.4 |
HIP 84367 |
35.76 |
| 2026-10-02 12:00 |
17:17:38.65 |
-19:54:47.9 |
HIP 84809 |
33.83 |
| 2026-10-03 00:00 |
17:17:51.99 |
-19:55:49.2 |
HIP 84809 |
30.60 |
| 2026-10-03 12:00 |
17:18:05.47 |
-19:56:50.5 |
HIP 84809 |
27.35 |
| 2026-10-04 00:00 |
17:18:19.08 |
-19:57:51.7 |
HIP 84809 |
24.10 |
| 2026-10-04 12:00 |
17:18:32.83 |
-19:58:52.7 |
HIP 84809 |
20.85 |
| 2026-10-05 00:00 |
17:18:46.71 |
-19:59:53.6 |
HIP 84809 |
17.61 |
| 2026-10-05 12:00 |
17:19:00.72 |
-20:00:54.3 |
HIP 84809 |
14.43 |
| 2026-10-06 00:00 |
17:19:14.87 |
-20:01:55.0 |
HIP 84809 |
11.38 |
| 2026-10-06 12:00 |
17:19:29.14 |
-20:02:55.5 |
HIP 84809 |
8.62 |
| 2026-10-07 00:00 |
17:19:43.55 |
-20:03:55.9 |
HIP 84809 |
6.59 |
| 2026-10-07 12:00 |
17:19:58.09 |
-20:04:56.1 |
HIP 84809 |
6.11 |
| 2026-10-08 00:00 |
17:20:12.75 |
-20:05:56.2 |
HIP 84809 |
7.53 |
| 2026-10-08 12:00 |
17:20:27.55 |
-20:06:56.2 |
HIP 84809 |
10.11 |
| 2026-10-09 00:00 |
17:20:42.47 |
-20:07:56.0 |
HIP 84809 |
13.20 |
| 2026-10-09 12:00 |
17:20:57.52 |
-20:08:55.6 |
HIP 84809 |
16.54 |
| 2026-10-10 00:00 |
17:21:12.69 |
-20:09:55.2 |
HIP 84809 |
20.02 |
| 2026-10-10 12:00 |
17:21:27.99 |
-20:10:54.5 |
HIP 85023 |
17.55 |
| 2026-10-11 00:00 |
17:21:43.41 |
-20:11:53.7 |
HIP 85023 |
13.83 |