| Parameter |
Value |
| Designation |
272P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-03-01T17:20:56.927040Z |
| Orbit solution date (soln_date, UTC) |
2023-02-22T00:13:19Z |
| Obs used |
189 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
18.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-10.0000000 |
| e |
0.45652880 |
| q (au) |
2.416276 |
| a (au) |
4.446005 |
| i (deg) |
18.188178 |
| Ω (om, deg) |
111.515253 |
| ω (w, deg) |
26.202307 |
| M (ma, deg) |
248.900968 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.618 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.618 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:43:51.44 |
-21:24:52.0 |
HIP 102332 |
4.15 |
| 2026-03-26 12:00 |
20:44:07.12 |
-21:24:29.8 |
HIP 102332 |
3.53 |
| 2026-03-27 00:00 |
20:44:22.70 |
-21:24:08.0 |
HIP 102332 |
5.87 |
| 2026-03-27 12:00 |
20:44:38.17 |
-21:23:46.7 |
HIP 102332 |
9.08 |
| 2026-03-28 00:00 |
20:44:53.54 |
-21:23:25.8 |
HIP 102332 |
12.50 |
| 2026-03-28 12:00 |
20:45:08.81 |
-21:23:05.3 |
HIP 102332 |
15.97 |
| 2026-03-29 00:00 |
20:45:23.96 |
-21:22:45.4 |
HIP 102487 |
13.42 |
| 2026-03-29 12:00 |
20:45:39.02 |
-21:22:25.8 |
HIP 102487 |
11.07 |
| 2026-03-30 00:00 |
20:45:53.96 |
-21:22:06.8 |
HIP 102487 |
9.49 |
| 2026-03-30 12:00 |
20:46:08.80 |
-21:21:48.1 |
HIP 102487 |
9.04 |
| 2026-03-31 00:00 |
20:46:23.53 |
-21:21:30.0 |
HIP 102487 |
9.86 |
| 2026-03-31 12:00 |
20:46:38.14 |
-21:21:12.3 |
HIP 102487 |
11.65 |
| 2026-04-01 00:00 |
20:46:52.65 |
-21:20:55.1 |
HIP 102487 |
14.04 |
| 2026-04-01 12:00 |
20:47:07.05 |
-21:20:38.4 |
HIP 102487 |
16.75 |
| 2026-04-02 00:00 |
20:47:21.34 |
-21:20:22.2 |
HIP 102487 |
19.63 |
| 2026-04-02 12:00 |
20:47:35.52 |
-21:20:06.5 |
HIP 102487 |
22.62 |
| 2026-04-03 00:00 |
20:47:49.59 |
-21:19:51.2 |
HIP 102743 |
25.50 |
| 2026-04-03 12:00 |
20:48:03.54 |
-21:19:36.5 |
HIP 102743 |
23.53 |
| 2026-04-04 00:00 |
20:48:17.38 |
-21:19:22.2 |
HIP 102743 |
21.87 |
| 2026-04-04 12:00 |
20:48:31.11 |
-21:19:08.5 |
HIP 102743 |
20.58 |
| 2026-04-05 00:00 |
20:48:44.72 |
-21:18:55.3 |
HIP 102743 |
19.74 |
| 2026-04-05 12:00 |
20:48:58.21 |
-21:18:42.6 |
HIP 102743 |
19.38 |
| 2026-04-06 00:00 |
20:49:11.59 |
-21:18:30.4 |
HIP 102743 |
19.52 |
| 2026-04-06 12:00 |
20:49:24.85 |
-21:18:18.7 |
HIP 102743 |
20.13 |
| 2026-04-07 00:00 |
20:49:38.00 |
-21:18:07.6 |
HIP 102908 |
17.74 |
| 2026-04-07 12:00 |
20:49:51.03 |
-21:17:57.0 |
HIP 102908 |
14.72 |
| 2026-04-08 00:00 |
20:50:03.94 |
-21:17:46.9 |
HIP 102908 |
11.73 |
| 2026-04-08 12:00 |
20:50:16.72 |
-21:17:37.4 |
HIP 102908 |
8.79 |
| 2026-04-09 00:00 |
20:50:29.39 |
-21:17:28.4 |
HIP 102908 |
5.90 |
| 2026-04-09 12:00 |
20:50:41.94 |
-21:17:20.0 |
HIP 102908 |
3.17 |
| 2026-04-10 00:00 |
20:50:54.36 |
-21:17:12.1 |
HIP 102908 |
1.53 |
| 2026-04-10 12:00 |
20:51:06.67 |
-21:17:04.8 |
HIP 102908 |
3.35 |
| 2026-04-11 00:00 |
20:51:18.85 |
-21:16:58.0 |
HIP 102908 |
6.02 |
| 2026-04-11 12:00 |
20:51:30.90 |
-21:16:51.8 |
HIP 102908 |
8.76 |
| 2026-04-12 00:00 |
20:51:42.83 |
-21:16:46.2 |
HIP 103027 |
9.49 |
| 2026-04-12 12:00 |
20:51:54.64 |
-21:16:41.2 |
HIP 103027 |
6.89 |
| 2026-04-13 00:00 |
20:52:06.32 |
-21:16:36.8 |
HIP 103027 |
4.50 |
| 2026-04-13 12:00 |
20:52:17.87 |
-21:16:32.9 |
HIP 103027 |
2.83 |
| 2026-04-14 00:00 |
20:52:29.30 |
-21:16:29.7 |
HIP 103027 |
3.19 |
| 2026-04-14 12:00 |
20:52:40.59 |
-21:16:27.0 |
HIP 103027 |
5.13 |
| 2026-04-15 00:00 |
20:52:51.76 |
-21:16:24.9 |
HIP 103027 |
7.48 |
| 2026-04-15 12:00 |
20:53:02.80 |
-21:16:23.4 |
HIP 103027 |
9.93 |
| 2026-04-16 00:00 |
20:53:13.71 |
-21:16:22.6 |
HIP 103027 |
12.40 |