| 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) |
| 2026-09-20 00:00 |
00:08:29.46 |
-16:55:31.4 |
HIP 533 |
31.38 |
| 2026-09-20 12:00 |
00:08:11.13 |
-16:57:00.4 |
HIP 533 |
27.97 |
| 2026-09-21 00:00 |
00:07:52.75 |
-16:58:28.2 |
HIP 533 |
24.94 |
| 2026-09-21 12:00 |
00:07:34.35 |
-16:59:54.8 |
HIP 533 |
22.45 |
| 2026-09-22 00:00 |
00:07:15.91 |
-17:01:20.2 |
HIP 533 |
20.69 |
| 2026-09-22 12:00 |
00:06:57.45 |
-17:02:44.3 |
HIP 533 |
19.86 |
| 2026-09-23 00:00 |
00:06:38.97 |
-17:04:07.2 |
HIP 533 |
20.07 |
| 2026-09-23 12:00 |
00:06:20.46 |
-17:05:28.8 |
HIP 533 |
21.28 |
| 2026-09-24 00:00 |
00:06:01.95 |
-17:06:49.1 |
HIP 533 |
23.35 |
| 2026-09-24 12:00 |
00:05:43.41 |
-17:08:08.0 |
HIP 320 |
24.91 |
| 2026-09-25 00:00 |
00:05:24.87 |
-17:09:25.7 |
HIP 320 |
21.33 |
| 2026-09-25 12:00 |
00:05:06.33 |
-17:10:42.0 |
HIP 320 |
18.21 |
| 2026-09-26 00:00 |
00:04:47.78 |
-17:11:56.9 |
HIP 333 |
15.62 |
| 2026-09-26 12:00 |
00:04:29.23 |
-17:13:10.4 |
HIP 333 |
12.77 |
| 2026-09-27 00:00 |
00:04:10.68 |
-17:14:22.5 |
HIP 301 |
8.54 |
| 2026-09-27 12:00 |
00:03:52.15 |
-17:15:33.2 |
HIP 301 |
4.96 |
| 2026-09-28 00:00 |
00:03:33.62 |
-17:16:42.5 |
HIP 301 |
4.30 |
| 2026-09-28 12:00 |
00:03:15.11 |
-17:17:50.4 |
HIP 301 |
7.36 |
| 2026-09-29 00:00 |
00:02:56.61 |
-17:18:56.7 |
HIP 301 |
11.46 |
| 2026-09-29 12:00 |
00:02:38.14 |
-17:20:01.6 |
HIP 301 |
15.81 |
| 2026-09-30 00:00 |
00:02:19.69 |
-17:21:05.0 |
HIP 301 |
20.23 |
| 2026-09-30 12:00 |
00:02:01.26 |
-17:22:06.8 |
HIP 301 |
24.68 |
| 2026-10-01 00:00 |
00:01:42.87 |
-17:23:07.2 |
HIP 112 |
26.57 |
| 2026-10-01 12:00 |
00:01:24.51 |
-17:24:06.0 |
HIP 112 |
27.23 |
| 2026-10-02 00:00 |
00:01:06.18 |
-17:25:03.2 |
HIP 112 |
28.57 |
| 2026-10-02 12:00 |
00:00:47.90 |
-17:25:58.9 |
HIP 112 |
30.48 |
| 2026-10-03 00:00 |
00:00:29.66 |
-17:26:53.0 |
HIP 112 |
32.86 |
| 2026-10-03 12:00 |
00:00:11.47 |
-17:27:45.4 |
HIP 118160 |
30.39 |
| 2026-10-04 00:00 |
23:59:53.33 |
-17:28:36.3 |
HIP 118160 |
26.26 |
| 2026-10-04 12:00 |
23:59:35.24 |
-17:29:25.5 |
HIP 118160 |
22.24 |
| 2026-10-05 00:00 |
23:59:17.21 |
-17:30:13.1 |
HIP 118160 |
18.39 |
| 2026-10-05 12:00 |
23:58:59.24 |
-17:30:59.0 |
HIP 118160 |
14.83 |
| 2026-10-06 00:00 |
23:58:41.34 |
-17:31:43.3 |
HIP 118160 |
11.81 |
| 2026-10-06 12:00 |
23:58:23.50 |
-17:32:25.9 |
HIP 118160 |
9.81 |
| 2026-10-07 00:00 |
23:58:05.74 |
-17:33:06.8 |
HIP 118160 |
9.47 |
| 2026-10-07 12:00 |
23:57:48.05 |
-17:33:45.9 |
HIP 118160 |
10.92 |
| 2026-10-08 00:00 |
23:57:30.44 |
-17:34:23.4 |
HIP 118160 |
13.57 |
| 2026-10-08 12:00 |
23:57:12.91 |
-17:34:59.1 |
HIP 118160 |
16.86 |
| 2026-10-09 00:00 |
23:56:55.46 |
-17:35:33.1 |
HIP 118160 |
20.45 |
| 2026-10-09 12:00 |
23:56:38.11 |
-17:36:05.4 |
HIP 117944 |
21.91 |
| 2026-10-10 00:00 |
23:56:20.84 |
-17:36:35.8 |
HIP 117944 |
18.48 |
| 2026-10-10 12:00 |
23:56:03.67 |
-17:37:04.5 |
HIP 117944 |
15.44 |
| 2026-10-11 00:00 |
23:55:46.60 |
-17:37:31.5 |
HIP 117944 |
13.05 |