| Parameter |
Value |
| Designation |
326P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-10-22T11:02:45.530880Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
301 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
8.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-02-09.0000000 |
| e |
0.31693822 |
| q (au) |
2.779374 |
| a (au) |
4.068993 |
| i (deg) |
2.470614 |
| Ω (om, deg) |
99.811413 |
| ω (w, deg) |
278.793743 |
| M (ma, deg) |
57.103197 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.907 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.907 |
| n |
2.000 |
| gf |
0.828 |
| gb |
-0.500 |
| k |
0.946 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
09:42:59.11 |
+15:45:49.9 |
HIP 47557 |
17.60 |
| 2026-06-01 12:00 |
09:43:15.46 |
+15:44:20.5 |
HIP 47557 |
21.55 |
| 2026-06-02 00:00 |
09:43:31.93 |
+15:42:50.5 |
HIP 47557 |
25.61 |
| 2026-06-02 12:00 |
09:43:48.52 |
+15:41:19.8 |
HIP 47557 |
29.75 |
| 2026-06-03 00:00 |
09:44:05.24 |
+15:39:48.4 |
HIP 47557 |
33.96 |
| 2026-06-03 12:00 |
09:44:22.07 |
+15:38:16.4 |
HIP 47557 |
38.22 |
| 2026-06-04 00:00 |
09:44:39.03 |
+15:36:43.7 |
HIP 48006 |
36.37 |
| 2026-06-04 12:00 |
09:44:56.11 |
+15:35:10.4 |
HIP 48006 |
32.10 |
| 2026-06-05 00:00 |
09:45:13.31 |
+15:33:36.5 |
HIP 48006 |
27.83 |
| 2026-06-05 12:00 |
09:45:30.62 |
+15:32:01.8 |
HIP 48006 |
23.60 |
| 2026-06-06 00:00 |
09:45:48.06 |
+15:30:26.6 |
HIP 48006 |
19.44 |
| 2026-06-06 12:00 |
09:46:05.61 |
+15:28:50.7 |
HIP 48006 |
15.44 |
| 2026-06-07 00:00 |
09:46:23.27 |
+15:27:14.1 |
HIP 48006 |
11.80 |
| 2026-06-07 12:00 |
09:46:41.05 |
+15:25:37.0 |
HIP 48006 |
9.01 |
| 2026-06-08 00:00 |
09:46:58.94 |
+15:23:59.2 |
HIP 48006 |
8.06 |
| 2026-06-08 12:00 |
09:47:16.95 |
+15:22:20.7 |
HIP 48006 |
9.57 |
| 2026-06-09 00:00 |
09:47:35.06 |
+15:20:41.7 |
HIP 48006 |
12.72 |
| 2026-06-09 12:00 |
09:47:53.29 |
+15:19:02.0 |
HIP 48006 |
16.63 |
| 2026-06-10 00:00 |
09:48:11.63 |
+15:17:21.7 |
HIP 48151 |
19.68 |
| 2026-06-10 12:00 |
09:48:30.08 |
+15:15:40.8 |
HIP 48151 |
19.28 |
| 2026-06-11 00:00 |
09:48:48.63 |
+15:13:59.2 |
HIP 48177 |
17.53 |
| 2026-06-11 12:00 |
09:49:07.29 |
+15:12:17.1 |
HIP 48177 |
14.89 |
| 2026-06-12 00:00 |
09:49:26.06 |
+15:10:34.3 |
HIP 48177 |
13.51 |
| 2026-06-12 12:00 |
09:49:44.93 |
+15:08:51.0 |
HIP 48177 |
13.80 |
| 2026-06-13 00:00 |
09:50:03.91 |
+15:07:07.0 |
HIP 48177 |
15.69 |
| 2026-06-13 12:00 |
09:50:22.99 |
+15:05:22.5 |
HIP 48177 |
18.73 |
| 2026-06-14 00:00 |
09:50:42.18 |
+15:03:37.3 |
HIP 48177 |
22.46 |
| 2026-06-14 12:00 |
09:51:01.46 |
+15:01:51.6 |
HIP 48177 |
26.63 |
| 2026-06-15 00:00 |
09:51:20.85 |
+15:00:05.3 |
HIP 48177 |
31.05 |
| 2026-06-15 12:00 |
09:51:40.34 |
+14:58:18.3 |
HIP 48410 |
30.26 |
| 2026-06-16 00:00 |
09:51:59.92 |
+14:56:30.8 |
HIP 48410 |
27.68 |
| 2026-06-16 12:00 |
09:52:19.60 |
+14:54:42.8 |
HIP 48524 |
23.84 |
| 2026-06-17 00:00 |
09:52:39.38 |
+14:52:54.1 |
HIP 48524 |
18.76 |
| 2026-06-17 12:00 |
09:52:59.26 |
+14:51:04.9 |
HIP 48524 |
13.66 |
| 2026-06-18 00:00 |
09:53:19.23 |
+14:49:15.2 |
HIP 48524 |
8.60 |
| 2026-06-18 12:00 |
09:53:39.29 |
+14:47:24.8 |
HIP 48524 |
3.79 |
| 2026-06-19 00:00 |
09:53:59.44 |
+14:45:34.0 |
HIP 48524 |
2.94 |
| 2026-06-19 12:00 |
09:54:19.69 |
+14:43:42.5 |
HIP 48524 |
7.59 |
| 2026-06-20 00:00 |
09:54:40.02 |
+14:41:50.5 |
HIP 48524 |
12.73 |
| 2026-06-20 12:00 |
09:55:00.45 |
+14:39:58.0 |
HIP 48524 |
17.96 |
| 2026-06-21 00:00 |
09:55:20.96 |
+14:38:05.0 |
HIP 48751 |
19.25 |
| 2026-06-21 12:00 |
09:55:41.56 |
+14:36:11.4 |
HIP 48751 |
15.34 |
| 2026-06-22 00:00 |
09:56:02.25 |
+14:34:17.3 |
HIP 48751 |
12.51 |