| 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) |
| 2026-07-29 00:00 |
17:12:54.14 |
-17:40:38.9 |
HIP 84194 |
19.02 |
| 2026-07-29 12:00 |
17:12:43.95 |
-17:41:33.7 |
HIP 84194 |
17.74 |
| 2026-07-30 00:00 |
17:12:33.95 |
-17:42:28.6 |
HIP 84194 |
16.76 |
| 2026-07-30 12:00 |
17:12:24.14 |
-17:43:23.8 |
HIP 84194 |
16.12 |
| 2026-07-31 00:00 |
17:12:14.53 |
-17:44:19.1 |
HIP 84064 |
15.35 |
| 2026-07-31 12:00 |
17:12:05.10 |
-17:45:14.6 |
HIP 84064 |
13.28 |
| 2026-08-01 00:00 |
17:11:55.86 |
-17:46:10.2 |
HIP 84064 |
11.39 |
| 2026-08-01 12:00 |
17:11:46.82 |
-17:47:06.1 |
HIP 84064 |
9.78 |
| 2026-08-02 00:00 |
17:11:37.97 |
-17:48:02.1 |
HIP 84064 |
8.55 |
| 2026-08-02 12:00 |
17:11:29.31 |
-17:48:58.3 |
HIP 84064 |
7.84 |
| 2026-08-03 00:00 |
17:11:20.85 |
-17:49:54.6 |
HIP 84064 |
7.78 |
| 2026-08-03 12:00 |
17:11:12.58 |
-17:50:51.2 |
HIP 84064 |
8.34 |
| 2026-08-04 00:00 |
17:11:04.51 |
-17:51:47.9 |
HIP 84064 |
9.38 |
| 2026-08-04 12:00 |
17:10:56.63 |
-17:52:44.7 |
HIP 84064 |
10.74 |
| 2026-08-05 00:00 |
17:10:48.95 |
-17:53:41.8 |
HIP 84064 |
12.29 |
| 2026-08-05 12:00 |
17:10:41.47 |
-17:54:39.0 |
HIP 83978 |
11.54 |
| 2026-08-06 00:00 |
17:10:34.18 |
-17:55:36.3 |
HIP 83978 |
9.57 |
| 2026-08-06 12:00 |
17:10:27.09 |
-17:56:33.9 |
HIP 83978 |
7.64 |
| 2026-08-07 00:00 |
17:10:20.19 |
-17:57:31.5 |
HIP 83978 |
5.74 |
| 2026-08-07 12:00 |
17:10:13.50 |
-17:58:29.4 |
HIP 83978 |
3.89 |
| 2026-08-08 00:00 |
17:10:07.00 |
-17:59:27.4 |
HIP 83978 |
2.09 |
| 2026-08-08 12:00 |
17:10:00.70 |
-18:00:25.6 |
HIP 83978 |
0.50 |
| 2026-08-09 00:00 |
17:09:54.60 |
-18:01:23.9 |
HIP 83978 |
1.53 |
| 2026-08-09 12:00 |
17:09:48.70 |
-18:02:22.4 |
HIP 83978 |
3.21 |
| 2026-08-10 00:00 |
17:09:43.00 |
-18:03:21.0 |
HIP 83978 |
4.86 |
| 2026-08-10 12:00 |
17:09:37.50 |
-18:04:19.8 |
HIP 83978 |
6.49 |
| 2026-08-11 00:00 |
17:09:32.20 |
-18:05:18.8 |
HIP 83978 |
8.08 |
| 2026-08-11 12:00 |
17:09:27.10 |
-18:06:17.8 |
HIP 83978 |
9.63 |
| 2026-08-12 00:00 |
17:09:22.20 |
-18:07:17.1 |
HIP 83978 |
11.15 |
| 2026-08-12 12:00 |
17:09:17.50 |
-18:08:16.5 |
HIP 83978 |
12.63 |
| 2026-08-13 00:00 |
17:09:13.00 |
-18:09:16.0 |
HIP 83978 |
14.08 |
| 2026-08-13 12:00 |
17:09:08.71 |
-18:10:15.6 |
HIP 83978 |
15.49 |
| 2026-08-14 00:00 |
17:09:04.61 |
-18:11:15.5 |
HIP 83978 |
16.87 |
| 2026-08-14 12:00 |
17:09:00.72 |
-18:12:15.4 |
HIP 83978 |
18.21 |
| 2026-08-15 00:00 |
17:08:57.03 |
-18:13:15.5 |
HIP 83850 |
17.32 |
| 2026-08-15 12:00 |
17:08:53.53 |
-18:14:15.7 |
HIP 83850 |
16.02 |
| 2026-08-16 00:00 |
17:08:50.24 |
-18:15:16.0 |
HIP 83850 |
14.75 |
| 2026-08-16 12:00 |
17:08:47.15 |
-18:16:16.5 |
HIP 83850 |
13.51 |
| 2026-08-17 00:00 |
17:08:44.26 |
-18:17:17.0 |
HIP 83850 |
12.30 |
| 2026-08-17 12:00 |
17:08:41.57 |
-18:18:17.8 |
HIP 83850 |
11.13 |
| 2026-08-18 00:00 |
17:08:39.08 |
-18:19:18.6 |
HIP 83850 |
9.99 |
| 2026-08-18 12:00 |
17:08:36.79 |
-18:20:19.5 |
HIP 83850 |
8.90 |
| 2026-08-19 00:00 |
17:08:34.69 |
-18:21:20.6 |
HIP 83850 |
7.86 |