| 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) |
| 2026-05-12 00:00 |
20:59:26.73 |
-21:30:52.6 |
HIP 103507 |
20.09 |
| 2026-05-12 12:00 |
20:59:29.93 |
-21:31:28.1 |
HIP 103507 |
21.03 |
| 2026-05-13 00:00 |
20:59:32.96 |
-21:32:04.2 |
HIP 103507 |
21.95 |
| 2026-05-13 12:00 |
20:59:35.84 |
-21:32:41.1 |
HIP 103507 |
22.85 |
| 2026-05-14 00:00 |
20:59:38.55 |
-21:33:18.7 |
HIP 103507 |
23.72 |
| 2026-05-14 12:00 |
20:59:41.11 |
-21:33:57.1 |
HIP 103507 |
24.57 |
| 2026-05-15 00:00 |
20:59:43.50 |
-21:34:36.2 |
HIP 103507 |
25.40 |
| 2026-05-15 12:00 |
20:59:45.73 |
-21:35:16.1 |
HIP 103507 |
26.20 |
| 2026-05-16 00:00 |
20:59:47.80 |
-21:35:56.7 |
HIP 103507 |
26.99 |
| 2026-05-16 12:00 |
20:59:49.71 |
-21:36:38.0 |
HIP 103507 |
27.75 |
| 2026-05-17 00:00 |
20:59:51.46 |
-21:37:20.1 |
HIP 103507 |
28.50 |
| 2026-05-17 12:00 |
20:59:53.04 |
-21:38:02.9 |
HIP 103507 |
29.22 |
| 2026-05-18 00:00 |
20:59:54.46 |
-21:38:46.4 |
HIP 103507 |
29.93 |
| 2026-05-18 12:00 |
20:59:55.72 |
-21:39:30.7 |
HIP 103507 |
30.62 |
| 2026-05-19 00:00 |
20:59:56.81 |
-21:40:15.7 |
HIP 103469 |
31.04 |
| 2026-05-19 12:00 |
20:59:57.74 |
-21:41:01.5 |
HIP 103469 |
31.42 |
| 2026-05-20 00:00 |
20:59:58.51 |
-21:41:48.0 |
HIP 103469 |
31.79 |
| 2026-05-20 12:00 |
20:59:59.11 |
-21:42:35.2 |
HIP 103469 |
32.14 |
| 2026-05-21 00:00 |
20:59:59.55 |
-21:43:23.1 |
HIP 103469 |
32.48 |
| 2026-05-21 12:00 |
20:59:59.83 |
-21:44:11.8 |
HIP 103469 |
32.79 |
| 2026-05-22 00:00 |
20:59:59.94 |
-21:45:01.2 |
HIP 103469 |
33.10 |
| 2026-05-22 12:00 |
20:59:59.89 |
-21:45:51.3 |
HIP 103469 |
33.39 |
| 2026-05-23 00:00 |
20:59:59.67 |
-21:46:42.1 |
HIP 103469 |
33.66 |
| 2026-05-23 12:00 |
20:59:59.29 |
-21:47:33.7 |
HIP 103469 |
33.93 |
| 2026-05-24 00:00 |
20:59:58.75 |
-21:48:26.0 |
HIP 103469 |
34.19 |
| 2026-05-24 12:00 |
20:59:58.04 |
-21:49:19.0 |
HIP 103469 |
34.44 |
| 2026-05-25 00:00 |
20:59:57.17 |
-21:50:12.7 |
HIP 103469 |
34.68 |
| 2026-05-25 12:00 |
20:59:56.13 |
-21:51:07.1 |
HIP 103469 |
34.92 |
| 2026-05-26 00:00 |
20:59:54.94 |
-21:52:02.2 |
HIP 103469 |
35.16 |
| 2026-05-26 12:00 |
20:59:53.57 |
-21:52:58.0 |
HIP 103469 |
35.40 |
| 2026-05-27 00:00 |
20:59:52.04 |
-21:53:54.5 |
HIP 103469 |
35.63 |
| 2026-05-27 12:00 |
20:59:50.35 |
-21:54:51.7 |
HIP 103469 |
35.88 |
| 2026-05-28 00:00 |
20:59:48.50 |
-21:55:49.6 |
HIP 103469 |
36.12 |
| 2026-05-28 12:00 |
20:59:46.48 |
-21:56:48.2 |
HIP 103469 |
36.37 |
| 2026-05-29 00:00 |
20:59:44.30 |
-21:57:47.5 |
HIP 103469 |
36.64 |
| 2026-05-29 12:00 |
20:59:41.95 |
-21:58:47.5 |
HIP 103469 |
36.91 |
| 2026-05-30 00:00 |
20:59:39.44 |
-21:59:48.1 |
HIP 103469 |
37.20 |
| 2026-05-30 12:00 |
20:59:36.77 |
-22:00:49.5 |
HIP 103469 |
37.51 |
| 2026-05-31 00:00 |
20:59:33.93 |
-22:01:51.5 |
HIP 103398 |
37.39 |
| 2026-05-31 12:00 |
20:59:30.93 |
-22:02:54.1 |
HIP 103398 |
36.75 |
| 2026-06-01 00:00 |
20:59:27.76 |
-22:03:57.5 |
HIP 103398 |
36.11 |
| 2026-06-01 12:00 |
20:59:24.43 |
-22:05:01.5 |
HIP 103398 |
35.46 |
| 2026-06-02 00:00 |
20:59:20.94 |
-22:06:06.2 |
HIP 103398 |
34.82 |