| Parameter |
Value |
| Designation |
180P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-12T15:22:26.811840Z |
| Orbit solution date (soln_date, UTC) |
2024-03-20T08:31:27Z |
| Obs used |
1053 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
22.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-04-24.0000000 |
| e |
0.35485436 |
| q (au) |
2.489292 |
| a (au) |
3.858497 |
| i (deg) |
16.870826 |
| Ω (om, deg) |
84.571386 |
| ω (w, deg) |
94.861225 |
| M (ma, deg) |
17.342053 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.358 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.358 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-09-29 |
2023-06-28 |
+16.2858 |
-6.848 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
23:29:46.57 |
-19:30:33.7 |
HIP 116061 |
17.70 |
| 2026-05-12 12:00 |
23:30:05.46 |
-19:30:06.4 |
HIP 116061 |
13.23 |
| 2026-05-13 00:00 |
23:30:24.25 |
-19:29:40.3 |
HIP 116061 |
8.79 |
| 2026-05-13 12:00 |
23:30:42.91 |
-19:29:15.3 |
HIP 116061 |
4.38 |
| 2026-05-14 00:00 |
23:31:01.46 |
-19:28:51.5 |
HIP 116061 |
0.54 |
| 2026-05-14 12:00 |
23:31:19.90 |
-19:28:28.8 |
HIP 116061 |
4.43 |
| 2026-05-15 00:00 |
23:31:38.21 |
-19:28:07.3 |
HIP 116061 |
8.75 |
| 2026-05-15 12:00 |
23:31:56.41 |
-19:27:46.9 |
HIP 116061 |
13.04 |
| 2026-05-16 00:00 |
23:32:14.49 |
-19:27:27.7 |
HIP 116061 |
17.31 |
| 2026-05-16 12:00 |
23:32:32.44 |
-19:27:09.7 |
HIP 116061 |
21.55 |
| 2026-05-17 00:00 |
23:32:50.28 |
-19:26:52.8 |
HIP 116271 |
20.52 |
| 2026-05-17 12:00 |
23:33:08.00 |
-19:26:37.1 |
HIP 116271 |
18.69 |
| 2026-05-18 00:00 |
23:33:25.59 |
-19:26:22.6 |
HIP 116271 |
17.69 |
| 2026-05-18 12:00 |
23:33:43.06 |
-19:26:09.3 |
HIP 116271 |
17.66 |
| 2026-05-19 00:00 |
23:34:00.40 |
-19:25:57.1 |
HIP 116271 |
18.58 |
| 2026-05-19 12:00 |
23:34:17.62 |
-19:25:46.2 |
HIP 116271 |
20.30 |
| 2026-05-20 00:00 |
23:34:34.71 |
-19:25:36.4 |
HIP 116271 |
22.63 |
| 2026-05-20 12:00 |
23:34:51.68 |
-19:25:27.9 |
HIP 116271 |
25.37 |
| 2026-05-21 00:00 |
23:35:08.52 |
-19:25:20.5 |
HIP 116271 |
28.41 |
| 2026-05-21 12:00 |
23:35:25.23 |
-19:25:14.4 |
HIP 116271 |
31.64 |
| 2026-05-22 00:00 |
23:35:41.81 |
-19:25:09.5 |
HIP 116271 |
35.00 |
| 2026-05-22 12:00 |
23:35:58.26 |
-19:25:05.7 |
HIP 116271 |
38.44 |
| 2026-05-23 00:00 |
23:36:14.58 |
-19:25:03.2 |
HIP 116271 |
41.94 |
| 2026-05-23 12:00 |
23:36:30.77 |
-19:25:01.9 |
HIP 116271 |
45.48 |
| 2026-05-24 00:00 |
23:36:46.83 |
-19:25:01.8 |
HIP 116739 |
43.58 |
| 2026-05-24 12:00 |
23:37:02.76 |
-19:25:03.0 |
HIP 116739 |
40.31 |
| 2026-05-25 00:00 |
23:37:18.56 |
-19:25:05.3 |
HIP 116739 |
37.17 |
| 2026-05-25 12:00 |
23:37:34.22 |
-19:25:08.9 |
HIP 116739 |
34.19 |
| 2026-05-26 00:00 |
23:37:49.74 |
-19:25:13.8 |
HIP 116739 |
31.40 |
| 2026-05-26 12:00 |
23:38:05.13 |
-19:25:19.8 |
HIP 116782 |
27.83 |
| 2026-05-27 00:00 |
23:38:20.39 |
-19:25:27.1 |
HIP 116782 |
24.23 |
| 2026-05-27 12:00 |
23:38:35.51 |
-19:25:35.7 |
HIP 116782 |
20.67 |
| 2026-05-28 00:00 |
23:38:50.49 |
-19:25:45.4 |
HIP 116782 |
17.14 |
| 2026-05-28 12:00 |
23:39:05.33 |
-19:25:56.5 |
HIP 116782 |
13.64 |
| 2026-05-29 00:00 |
23:39:20.04 |
-19:26:08.7 |
HIP 116782 |
10.17 |
| 2026-05-29 12:00 |
23:39:34.61 |
-19:26:22.3 |
HIP 116782 |
6.74 |
| 2026-05-30 00:00 |
23:39:49.03 |
-19:26:37.0 |
HIP 116782 |
3.35 |
| 2026-05-30 12:00 |
23:40:03.32 |
-19:26:53.1 |
HIP 116782 |
0.55 |
| 2026-05-31 00:00 |
23:40:17.46 |
-19:27:10.4 |
HIP 116782 |
3.45 |
| 2026-05-31 12:00 |
23:40:31.46 |
-19:27:28.9 |
HIP 116782 |
6.75 |
| 2026-06-01 00:00 |
23:40:45.32 |
-19:27:48.7 |
HIP 116782 |
10.02 |
| 2026-06-01 12:00 |
23:40:59.03 |
-19:28:09.8 |
HIP 116782 |
13.26 |
| 2026-06-02 00:00 |
23:41:12.60 |
-19:28:32.2 |
HIP 116782 |
16.48 |