312P/NEAT
| Parameter |
Value |
| Designation |
312P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-09-24T19:35:29.054400Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T13:44:31Z |
| Obs used |
161 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-08-05.0000000 |
| e |
0.43012991 |
| q (au) |
1.971316 |
| a (au) |
3.459237 |
| i (deg) |
19.791956 |
| Ω (om, deg) |
144.887861 |
| ω (w, deg) |
207.686469 |
| M (ma, deg) |
184.317953 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.152 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.152 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.890 |
| k |
0.999 |
| 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) |
| 2026-02-03 00:00 |
17:07:02.03 |
-05:18:02.0 |
HIP 83901 |
27.54 |
| 2026-02-03 12:00 |
17:07:36.71 |
-05:17:22.6 |
HIP 83901 |
19.05 |
| 2026-02-04 00:00 |
17:08:11.30 |
-05:16:42.0 |
HIP 83901 |
10.84 |
| 2026-02-04 12:00 |
17:08:45.82 |
-05:16:00.1 |
HIP 83901 |
4.59 |
| 2026-02-05 00:00 |
17:09:20.25 |
-05:15:17.0 |
HIP 83901 |
8.54 |
| 2026-02-05 12:00 |
17:09:54.60 |
-05:14:32.6 |
HIP 83901 |
16.49 |
| 2026-02-06 00:00 |
17:10:28.86 |
-05:13:46.9 |
HIP 84046 |
19.25 |
| 2026-02-06 12:00 |
17:11:03.04 |
-05:13:00.0 |
HIP 84046 |
18.81 |
| 2026-02-07 00:00 |
17:11:37.13 |
-05:12:11.8 |
HIP 84212 |
19.04 |
| 2026-02-07 12:00 |
17:12:11.13 |
-05:11:22.4 |
HIP 84212 |
10.72 |
| 2026-02-08 00:00 |
17:12:45.04 |
-05:10:31.7 |
HIP 84212 |
3.46 |
| 2026-02-08 12:00 |
17:13:18.87 |
-05:09:39.7 |
HIP 84212 |
7.25 |
| 2026-02-09 00:00 |
17:13:52.59 |
-05:08:46.5 |
HIP 84212 |
15.36 |
| 2026-02-09 12:00 |
17:14:26.23 |
-05:07:52.1 |
HIP 84212 |
23.68 |
| 2026-02-10 00:00 |
17:14:59.77 |
-05:06:56.3 |
HIP 84212 |
32.03 |
| 2026-02-10 12:00 |
17:15:33.21 |
-05:05:59.3 |
HIP 84580 |
27.04 |
| 2026-02-11 00:00 |
17:16:06.56 |
-05:05:01.1 |
HIP 84580 |
18.88 |
| 2026-02-11 12:00 |
17:16:39.81 |
-05:04:01.6 |
HIP 84580 |
11.07 |
| 2026-02-12 00:00 |
17:17:12.96 |
-05:03:00.9 |
HIP 84580 |
5.27 |
| 2026-02-12 12:00 |
17:17:46.00 |
-05:01:58.9 |
HIP 84580 |
8.45 |
| 2026-02-13 00:00 |
17:18:18.95 |
-05:00:55.6 |
HIP 84580 |
15.88 |
| 2026-02-13 12:00 |
17:18:51.79 |
-04:59:51.2 |
HIP 84580 |
23.85 |
| 2026-02-14 00:00 |
17:19:24.52 |
-04:58:45.4 |
HIP 84580 |
31.94 |
| 2026-02-14 12:00 |
17:19:57.15 |
-04:57:38.4 |
HIP 84831 |
33.39 |
| 2026-02-15 00:00 |
17:20:29.67 |
-04:56:30.2 |
HIP 84831 |
34.23 |
| 2026-02-15 12:00 |
17:21:02.07 |
-04:55:20.8 |
HIP 84831 |
36.92 |
| 2026-02-16 00:00 |
17:21:34.37 |
-04:54:10.1 |
HIP 84831 |
41.09 |
| 2026-02-16 12:00 |
17:22:06.56 |
-04:52:58.2 |
HIP 85085 |
38.32 |
| 2026-02-17 00:00 |
17:22:38.63 |
-04:51:45.0 |
HIP 85085 |
36.23 |
| 2026-02-17 12:00 |
17:23:10.59 |
-04:50:30.6 |
HIP 85165 |
33.26 |
| 2026-02-18 00:00 |
17:23:42.43 |
-04:49:15.0 |
HIP 85165 |
31.40 |
| 2026-02-18 12:00 |
17:24:14.15 |
-04:47:58.2 |
HIP 85165 |
31.56 |
| 2026-02-19 00:00 |
17:24:45.75 |
-04:46:40.1 |
HIP 85365 |
33.52 |
| 2026-02-19 12:00 |
17:25:17.24 |
-04:45:20.9 |
HIP 85365 |
28.24 |
| 2026-02-20 00:00 |
17:25:48.60 |
-04:44:00.4 |
HIP 85365 |
24.49 |
| 2026-02-20 12:00 |
17:26:19.83 |
-04:42:38.7 |
HIP 85365 |
22.99 |
| 2026-02-21 00:00 |
17:26:50.95 |
-04:41:15.9 |
HIP 85365 |
24.14 |
| 2026-02-21 12:00 |
17:27:21.93 |
-04:39:51.8 |
HIP 85365 |
27.60 |
| 2026-02-22 00:00 |
17:27:52.80 |
-04:38:26.5 |
HIP 85365 |
32.61 |
| 2026-02-22 12:00 |
17:28:23.53 |
-04:37:00.1 |
HIP 85661 |
32.60 |
| 2026-02-23 00:00 |
17:28:54.13 |
-04:35:32.4 |
HIP 85661 |
25.24 |
| 2026-02-23 12:00 |
17:29:24.60 |
-04:34:03.6 |
HIP 85661 |
18.22 |
| 2026-02-24 00:00 |
17:29:54.94 |
-04:32:33.6 |
HIP 85661 |
12.13 |