| 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 |
0.829 |
| 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) |
| 2026-03-26 00:00 |
09:32:24.21 |
+16:56:51.9 |
HIP 46896 |
18.37 |
| 2026-03-26 12:00 |
09:32:15.29 |
+16:57:28.2 |
HIP 46896 |
19.80 |
| 2026-03-27 00:00 |
09:32:06.58 |
+16:58:03.2 |
HIP 46896 |
21.32 |
| 2026-03-27 12:00 |
09:31:58.08 |
+16:58:37.2 |
HIP 46896 |
22.91 |
| 2026-03-28 00:00 |
09:31:49.79 |
+16:59:09.9 |
HIP 46896 |
24.54 |
| 2026-03-28 12:00 |
09:31:41.72 |
+16:59:41.6 |
HIP 46896 |
26.18 |
| 2026-03-29 00:00 |
09:31:33.87 |
+17:00:12.1 |
HIP 46896 |
27.83 |
| 2026-03-29 12:00 |
09:31:26.23 |
+17:00:41.5 |
HIP 46896 |
29.46 |
| 2026-03-30 00:00 |
09:31:18.81 |
+17:01:09.7 |
HIP 46896 |
31.08 |
| 2026-03-30 12:00 |
09:31:11.60 |
+17:01:36.8 |
HIP 46896 |
32.67 |
| 2026-03-31 00:00 |
09:31:04.61 |
+17:02:02.7 |
HIP 46896 |
34.24 |
| 2026-03-31 12:00 |
09:30:57.84 |
+17:02:27.6 |
HIP 46896 |
35.77 |
| 2026-04-01 00:00 |
09:30:51.29 |
+17:02:51.2 |
HIP 46896 |
37.26 |
| 2026-04-01 12:00 |
09:30:44.96 |
+17:03:13.8 |
HIP 46896 |
38.71 |
| 2026-04-02 00:00 |
09:30:38.84 |
+17:03:35.3 |
HIP 46545 |
38.85 |
| 2026-04-02 12:00 |
09:30:32.94 |
+17:03:55.6 |
HIP 46545 |
37.99 |
| 2026-04-03 00:00 |
09:30:27.26 |
+17:04:14.8 |
HIP 46545 |
37.20 |
| 2026-04-03 12:00 |
09:30:21.81 |
+17:04:32.8 |
HIP 46545 |
36.48 |
| 2026-04-04 00:00 |
09:30:16.57 |
+17:04:49.8 |
HIP 46545 |
35.83 |
| 2026-04-04 12:00 |
09:30:11.55 |
+17:05:05.6 |
HIP 46545 |
35.24 |
| 2026-04-05 00:00 |
09:30:06.75 |
+17:05:20.4 |
HIP 46545 |
34.72 |
| 2026-04-05 12:00 |
09:30:02.17 |
+17:05:34.0 |
HIP 46545 |
34.26 |
| 2026-04-06 00:00 |
09:29:57.81 |
+17:05:46.5 |
HIP 46545 |
33.86 |
| 2026-04-06 12:00 |
09:29:53.67 |
+17:05:57.9 |
HIP 46545 |
33.51 |
| 2026-04-07 00:00 |
09:29:49.75 |
+17:06:08.1 |
HIP 46545 |
33.22 |
| 2026-04-07 12:00 |
09:29:46.05 |
+17:06:17.3 |
HIP 46545 |
32.97 |
| 2026-04-08 00:00 |
09:29:42.58 |
+17:06:25.4 |
HIP 46545 |
32.77 |
| 2026-04-08 12:00 |
09:29:39.32 |
+17:06:32.4 |
HIP 46545 |
32.61 |
| 2026-04-09 00:00 |
09:29:36.28 |
+17:06:38.3 |
HIP 46545 |
32.48 |
| 2026-04-09 12:00 |
09:29:33.46 |
+17:06:43.1 |
HIP 46545 |
32.39 |
| 2026-04-10 00:00 |
09:29:30.87 |
+17:06:46.8 |
HIP 46545 |
32.34 |
| 2026-04-10 12:00 |
09:29:28.49 |
+17:06:49.4 |
HIP 46545 |
32.31 |
| 2026-04-11 00:00 |
09:29:26.34 |
+17:06:50.9 |
HIP 46545 |
32.30 |
| 2026-04-11 12:00 |
09:29:24.40 |
+17:06:51.3 |
HIP 46545 |
32.32 |
| 2026-04-12 00:00 |
09:29:22.69 |
+17:06:50.7 |
HIP 46545 |
32.36 |
| 2026-04-12 12:00 |
09:29:21.19 |
+17:06:49.0 |
HIP 46545 |
32.42 |
| 2026-04-13 00:00 |
09:29:19.91 |
+17:06:46.2 |
HIP 46545 |
32.49 |
| 2026-04-13 12:00 |
09:29:18.86 |
+17:06:42.3 |
HIP 46545 |
32.58 |
| 2026-04-14 00:00 |
09:29:18.02 |
+17:06:37.3 |
HIP 46545 |
32.68 |
| 2026-04-14 12:00 |
09:29:17.40 |
+17:06:31.3 |
HIP 46545 |
32.80 |
| 2026-04-15 00:00 |
09:29:17.00 |
+17:06:24.2 |
HIP 46545 |
32.93 |
| 2026-04-15 12:00 |
09:29:16.82 |
+17:06:16.1 |
HIP 46545 |
33.07 |
| 2026-04-16 00:00 |
09:29:16.85 |
+17:06:06.9 |
HIP 46545 |
33.22 |