215P/NEAT
| Parameter |
Value |
| Designation |
215P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-09-26T23:10:53.829120Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:14Z |
| Obs used |
1011 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
9.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-22.0000000 |
| e |
0.19926841 |
| q (au) |
3.469082 |
| a (au) |
4.332390 |
| i (deg) |
10.044042 |
| Ω (om, deg) |
62.721232 |
| ω (w, deg) |
254.117315 |
| M (ma, deg) |
199.772677 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.913 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.913 |
| n |
6.000 |
| gf |
0.982 |
| gb |
-0.876 |
| k |
0.839 |
| δ90 |
4.345 |
| 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 |
13:36:48.96 |
-01:07:20.0 |
HIP 66391 |
8.39 |
| 2026-02-03 12:00 |
13:36:51.68 |
-01:07:05.0 |
HIP 66391 |
8.76 |
| 2026-02-04 00:00 |
13:36:54.19 |
-01:06:48.8 |
HIP 66391 |
9.18 |
| 2026-02-04 12:00 |
13:36:56.49 |
-01:06:31.5 |
HIP 66391 |
9.63 |
| 2026-02-05 00:00 |
13:36:58.59 |
-01:06:13.1 |
HIP 66391 |
10.10 |
| 2026-02-05 12:00 |
13:37:00.47 |
-01:05:53.6 |
HIP 66391 |
10.58 |
| 2026-02-06 00:00 |
13:37:02.16 |
-01:05:32.9 |
HIP 66391 |
11.06 |
| 2026-02-06 12:00 |
13:37:03.63 |
-01:05:11.2 |
HIP 66391 |
11.54 |
| 2026-02-07 00:00 |
13:37:04.89 |
-01:04:48.3 |
HIP 66391 |
12.02 |
| 2026-02-07 12:00 |
13:37:05.94 |
-01:04:24.3 |
HIP 66391 |
12.50 |
| 2026-02-08 00:00 |
13:37:06.79 |
-01:03:59.2 |
HIP 66391 |
12.97 |
| 2026-02-08 12:00 |
13:37:07.42 |
-01:03:33.0 |
HIP 66391 |
13.43 |
| 2026-02-09 00:00 |
13:37:07.84 |
-01:03:05.7 |
HIP 66391 |
13.88 |
| 2026-02-09 12:00 |
13:37:08.05 |
-01:02:37.4 |
HIP 66391 |
14.33 |
| 2026-02-10 00:00 |
13:37:08.05 |
-01:02:07.9 |
HIP 66367 |
14.72 |
| 2026-02-10 12:00 |
13:37:07.83 |
-01:01:37.3 |
HIP 66367 |
14.46 |
| 2026-02-11 00:00 |
13:37:07.41 |
-01:01:05.7 |
HIP 66367 |
14.16 |
| 2026-02-11 12:00 |
13:37:06.77 |
-01:00:33.0 |
HIP 66367 |
13.82 |
| 2026-02-12 00:00 |
13:37:05.91 |
-00:59:59.2 |
HIP 66367 |
13.43 |
| 2026-02-12 12:00 |
13:37:04.85 |
-00:59:24.3 |
HIP 66367 |
13.01 |
| 2026-02-13 00:00 |
13:37:03.57 |
-00:58:48.4 |
HIP 66367 |
12.55 |
| 2026-02-13 12:00 |
13:37:02.07 |
-00:58:11.4 |
HIP 66367 |
12.05 |
| 2026-02-14 00:00 |
13:37:00.36 |
-00:57:33.3 |
HIP 66367 |
11.52 |
| 2026-02-14 12:00 |
13:36:58.44 |
-00:56:54.3 |
HIP 66367 |
10.97 |
| 2026-02-15 00:00 |
13:36:56.30 |
-00:56:14.1 |
HIP 66367 |
10.39 |
| 2026-02-15 12:00 |
13:36:53.95 |
-00:55:33.0 |
HIP 66367 |
9.80 |
| 2026-02-16 00:00 |
13:36:51.39 |
-00:54:50.8 |
HIP 66367 |
9.21 |
| 2026-02-16 12:00 |
13:36:48.61 |
-00:54:07.6 |
HIP 66367 |
8.63 |
| 2026-02-17 00:00 |
13:36:45.62 |
-00:53:23.4 |
HIP 66367 |
8.09 |
| 2026-02-17 12:00 |
13:36:42.41 |
-00:52:38.2 |
HIP 66367 |
7.62 |
| 2026-02-18 00:00 |
13:36:38.99 |
-00:51:52.0 |
HIP 66367 |
7.25 |
| 2026-02-18 12:00 |
13:36:35.36 |
-00:51:04.8 |
HIP 66367 |
7.02 |
| 2026-02-19 00:00 |
13:36:31.51 |
-00:50:16.6 |
HIP 66367 |
6.97 |
| 2026-02-19 12:00 |
13:36:27.45 |
-00:49:27.5 |
HIP 66367 |
7.13 |
| 2026-02-20 00:00 |
13:36:23.18 |
-00:48:37.4 |
HIP 66367 |
7.53 |
| 2026-02-20 12:00 |
13:36:18.69 |
-00:47:46.4 |
HIP 66367 |
8.14 |
| 2026-02-21 00:00 |
13:36:14.00 |
-00:46:54.4 |
HIP 66367 |
8.95 |
| 2026-02-21 12:00 |
13:36:09.09 |
-00:46:01.5 |
HIP 66367 |
9.93 |
| 2026-02-22 00:00 |
13:36:03.97 |
-00:45:07.6 |
HIP 66353 |
10.53 |
| 2026-02-22 12:00 |
13:35:58.65 |
-00:44:12.9 |
HIP 66353 |
9.56 |
| 2026-02-23 00:00 |
13:35:53.11 |
-00:43:17.3 |
HIP 66353 |
8.78 |
| 2026-02-23 12:00 |
13:35:47.37 |
-00:42:20.7 |
HIP 66353 |
8.27 |
| 2026-02-24 00:00 |
13:35:41.42 |
-00:41:23.3 |
HIP 66353 |
8.11 |