| Parameter |
Value |
| Designation |
232P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-10-01T10:51:18.581760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:01Z |
| Obs used |
297 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
19.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-10-02.0000000 |
| e |
0.33492236 |
| q (au) |
2.982861 |
| a (au) |
4.484981 |
| i (deg) |
14.635076 |
| Ω (om, deg) |
56.129136 |
| ω (w, deg) |
53.417372 |
| M (ma, deg) |
37.932128 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.156 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.156 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
00:28:39.83 |
-13:46:36.4 |
HIP 2291 |
15.67 |
| 2026-07-29 12:00 |
00:28:38.11 |
-13:48:01.1 |
HIP 2291 |
17.08 |
| 2026-07-30 00:00 |
00:28:36.18 |
-13:49:26.7 |
HIP 2291 |
18.54 |
| 2026-07-30 12:00 |
00:28:34.05 |
-13:50:53.3 |
HIP 2291 |
20.05 |
| 2026-07-31 00:00 |
00:28:31.71 |
-13:52:20.9 |
HIP 2291 |
21.59 |
| 2026-07-31 12:00 |
00:28:29.17 |
-13:53:49.5 |
HIP 2291 |
23.18 |
| 2026-08-01 00:00 |
00:28:26.43 |
-13:55:19.0 |
HIP 2291 |
24.81 |
| 2026-08-01 12:00 |
00:28:23.48 |
-13:56:49.4 |
HIP 2150 |
25.06 |
| 2026-08-02 00:00 |
00:28:20.32 |
-13:58:20.8 |
HIP 2150 |
23.44 |
| 2026-08-02 12:00 |
00:28:16.96 |
-13:59:53.2 |
HIP 2150 |
21.78 |
| 2026-08-03 00:00 |
00:28:13.39 |
-14:01:26.4 |
HIP 2150 |
20.09 |
| 2026-08-03 12:00 |
00:28:09.62 |
-14:03:00.5 |
HIP 2150 |
18.37 |
| 2026-08-04 00:00 |
00:28:05.64 |
-14:04:35.5 |
HIP 2150 |
16.62 |
| 2026-08-04 12:00 |
00:28:01.46 |
-14:06:11.4 |
HIP 2150 |
14.84 |
| 2026-08-05 00:00 |
00:27:57.06 |
-14:07:48.2 |
HIP 2150 |
13.05 |
| 2026-08-05 12:00 |
00:27:52.46 |
-14:09:25.8 |
HIP 2150 |
11.25 |
| 2026-08-06 00:00 |
00:27:47.66 |
-14:11:04.3 |
HIP 2150 |
9.48 |
| 2026-08-06 12:00 |
00:27:42.65 |
-14:12:43.5 |
HIP 2150 |
7.76 |
| 2026-08-07 00:00 |
00:27:37.43 |
-14:14:23.6 |
HIP 2150 |
6.21 |
| 2026-08-07 12:00 |
00:27:32.01 |
-14:16:04.5 |
HIP 2150 |
5.01 |
| 2026-08-08 00:00 |
00:27:26.38 |
-14:17:46.2 |
HIP 2150 |
4.53 |
| 2026-08-08 12:00 |
00:27:20.54 |
-14:19:28.7 |
HIP 2150 |
5.02 |
| 2026-08-09 00:00 |
00:27:14.50 |
-14:21:11.9 |
HIP 2150 |
6.32 |
| 2026-08-09 12:00 |
00:27:08.25 |
-14:22:55.8 |
HIP 2150 |
8.07 |
| 2026-08-10 00:00 |
00:27:01.79 |
-14:24:40.5 |
HIP 2150 |
10.07 |
| 2026-08-10 12:00 |
00:26:55.14 |
-14:26:25.9 |
HIP 2150 |
12.22 |
| 2026-08-11 00:00 |
00:26:48.27 |
-14:28:12.0 |
HIP 2150 |
14.47 |
| 2026-08-11 12:00 |
00:26:41.21 |
-14:29:58.7 |
HIP 2150 |
16.80 |
| 2026-08-12 00:00 |
00:26:33.93 |
-14:31:46.1 |
HIP 2150 |
19.20 |
| 2026-08-12 12:00 |
00:26:26.46 |
-14:33:34.1 |
HIP 2150 |
21.66 |
| 2026-08-13 00:00 |
00:26:18.78 |
-14:35:22.7 |
HIP 2150 |
24.17 |
| 2026-08-13 12:00 |
00:26:10.91 |
-14:37:11.9 |
HIP 2150 |
26.74 |
| 2026-08-14 00:00 |
00:26:02.83 |
-14:39:01.7 |
HIP 2150 |
29.35 |
| 2026-08-14 12:00 |
00:25:54.55 |
-14:40:52.1 |
HIP 2150 |
32.01 |
| 2026-08-15 00:00 |
00:25:46.07 |
-14:42:43.0 |
HIP 1893 |
34.43 |
| 2026-08-15 12:00 |
00:25:37.40 |
-14:44:34.4 |
HIP 1893 |
34.10 |
| 2026-08-16 00:00 |
00:25:28.53 |
-14:46:26.3 |
HIP 1893 |
33.98 |
| 2026-08-16 12:00 |
00:25:19.46 |
-14:48:18.7 |
HIP 1822 |
32.65 |
| 2026-08-17 00:00 |
00:25:10.19 |
-14:50:11.5 |
HIP 1822 |
30.51 |
| 2026-08-17 12:00 |
00:25:00.73 |
-14:52:04.8 |
HIP 1822 |
28.47 |
| 2026-08-18 00:00 |
00:24:51.08 |
-14:53:58.4 |
HIP 1822 |
26.57 |
| 2026-08-18 12:00 |
00:24:41.24 |
-14:55:52.5 |
HIP 1822 |
24.84 |
| 2026-08-19 00:00 |
00:24:31.21 |
-14:57:46.9 |
HIP 1822 |
23.34 |