| 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) |
| 2026-06-01 00:00 |
17:46:50.85 |
-16:19:09.0 |
HIP 87035 |
16.41 |
| 2026-06-01 12:00 |
17:46:31.42 |
-16:19:36.9 |
HIP 87035 |
17.13 |
| 2026-06-02 00:00 |
17:46:11.92 |
-16:20:05.1 |
HIP 87035 |
19.02 |
| 2026-06-02 12:00 |
17:45:52.34 |
-16:20:33.5 |
HIP 87035 |
21.78 |
| 2026-06-03 00:00 |
17:45:32.69 |
-16:21:02.2 |
HIP 87035 |
25.14 |
| 2026-06-03 12:00 |
17:45:12.98 |
-16:21:31.2 |
HIP 86875 |
24.48 |
| 2026-06-04 00:00 |
17:44:53.20 |
-16:22:00.5 |
HIP 86875 |
23.81 |
| 2026-06-04 12:00 |
17:44:33.35 |
-16:22:30.0 |
HIP 86875 |
24.09 |
| 2026-06-05 00:00 |
17:44:13.45 |
-16:22:59.8 |
HIP 86875 |
25.28 |
| 2026-06-05 12:00 |
17:43:53.49 |
-16:23:29.9 |
HIP 86875 |
27.29 |
| 2026-06-06 00:00 |
17:43:33.48 |
-16:24:00.3 |
HIP 86669 |
28.91 |
| 2026-06-06 12:00 |
17:43:13.42 |
-16:24:30.9 |
HIP 86669 |
27.11 |
| 2026-06-07 00:00 |
17:42:53.31 |
-16:25:01.8 |
HIP 86669 |
26.11 |
| 2026-06-07 12:00 |
17:42:33.16 |
-16:25:33.0 |
HIP 86669 |
25.99 |
| 2026-06-08 00:00 |
17:42:12.97 |
-16:26:04.5 |
HIP 86669 |
26.78 |
| 2026-06-08 12:00 |
17:41:52.73 |
-16:26:36.2 |
HIP 86669 |
28.40 |
| 2026-06-09 00:00 |
17:41:32.46 |
-16:27:08.2 |
HIP 86495 |
25.10 |
| 2026-06-09 12:00 |
17:41:12.16 |
-16:27:40.5 |
HIP 86495 |
22.15 |
| 2026-06-10 00:00 |
17:40:51.83 |
-16:28:13.0 |
HIP 86495 |
19.97 |
| 2026-06-10 12:00 |
17:40:31.47 |
-16:28:45.8 |
HIP 86495 |
18.84 |
| 2026-06-11 00:00 |
17:40:11.09 |
-16:29:18.9 |
HIP 86495 |
18.95 |
| 2026-06-11 12:00 |
17:39:50.68 |
-16:29:52.2 |
HIP 86495 |
20.29 |
| 2026-06-12 00:00 |
17:39:30.26 |
-16:30:25.8 |
HIP 86495 |
22.63 |
| 2026-06-12 12:00 |
17:39:09.83 |
-16:30:59.7 |
HIP 86495 |
25.72 |
| 2026-06-13 00:00 |
17:38:49.38 |
-16:31:33.8 |
HIP 86495 |
29.31 |
| 2026-06-13 12:00 |
17:38:28.93 |
-16:32:08.2 |
HIP 86181 |
27.36 |
| 2026-06-14 00:00 |
17:38:08.47 |
-16:32:42.9 |
HIP 86181 |
22.44 |
| 2026-06-14 12:00 |
17:37:48.01 |
-16:33:17.8 |
HIP 86181 |
17.53 |
| 2026-06-15 00:00 |
17:37:27.55 |
-16:33:53.0 |
HIP 86181 |
12.64 |
| 2026-06-15 12:00 |
17:37:07.10 |
-16:34:28.5 |
HIP 86181 |
7.81 |
| 2026-06-16 00:00 |
17:36:46.66 |
-16:35:04.2 |
HIP 86181 |
3.30 |
| 2026-06-16 12:00 |
17:36:26.22 |
-16:35:40.1 |
HIP 86171 |
2.65 |
| 2026-06-17 00:00 |
17:36:05.81 |
-16:36:16.4 |
HIP 86171 |
6.74 |
| 2026-06-17 12:00 |
17:35:45.41 |
-16:36:52.9 |
HIP 86171 |
11.50 |
| 2026-06-18 00:00 |
17:35:25.03 |
-16:37:29.6 |
HIP 86023 |
9.12 |
| 2026-06-18 12:00 |
17:35:04.68 |
-16:38:06.6 |
HIP 86023 |
4.29 |
| 2026-06-19 00:00 |
17:34:44.35 |
-16:38:43.8 |
HIP 86023 |
1.44 |
| 2026-06-19 12:00 |
17:34:24.05 |
-16:39:21.3 |
HIP 86023 |
5.82 |
| 2026-06-20 00:00 |
17:34:03.79 |
-16:39:59.1 |
HIP 86023 |
10.65 |
| 2026-06-20 12:00 |
17:33:43.57 |
-16:40:37.1 |
HIP 85914 |
9.28 |
| 2026-06-21 00:00 |
17:33:23.38 |
-16:41:15.3 |
HIP 85914 |
8.72 |
| 2026-06-21 12:00 |
17:33:03.24 |
-16:41:53.8 |
HIP 85914 |
10.67 |
| 2026-06-22 00:00 |
17:32:43.14 |
-16:42:32.5 |
HIP 85914 |
14.09 |