326P/Hill
| 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) |
| 2026-02-03 00:00 |
10:00:00.23 |
+14:34:40.7 |
HIP 49010 |
18.04 |
| 2026-02-03 12:00 |
09:59:41.98 |
+14:36:28.8 |
HIP 49010 |
16.43 |
| 2026-02-04 00:00 |
09:59:23.65 |
+14:38:16.9 |
HIP 49010 |
16.14 |
| 2026-02-04 12:00 |
09:59:05.25 |
+14:40:05.1 |
HIP 49010 |
17.23 |
| 2026-02-05 00:00 |
09:58:46.77 |
+14:41:53.5 |
HIP 49010 |
19.49 |
| 2026-02-05 12:00 |
09:58:28.23 |
+14:43:41.9 |
HIP 48842 |
22.09 |
| 2026-02-06 00:00 |
09:58:09.63 |
+14:45:30.3 |
HIP 48842 |
18.63 |
| 2026-02-06 12:00 |
09:57:50.96 |
+14:47:18.8 |
HIP 48842 |
15.92 |
| 2026-02-07 00:00 |
09:57:32.24 |
+14:49:07.3 |
HIP 48842 |
14.39 |
| 2026-02-07 12:00 |
09:57:13.46 |
+14:50:55.7 |
HIP 48751 |
11.48 |
| 2026-02-08 00:00 |
09:56:54.63 |
+14:52:44.1 |
HIP 48751 |
10.16 |
| 2026-02-08 12:00 |
09:56:35.76 |
+14:54:32.5 |
HIP 48751 |
11.08 |
| 2026-02-09 00:00 |
09:56:16.84 |
+14:56:20.8 |
HIP 48751 |
13.80 |
| 2026-02-09 12:00 |
09:55:57.88 |
+14:58:09.0 |
HIP 48751 |
17.51 |
| 2026-02-10 00:00 |
09:55:38.89 |
+14:59:57.0 |
HIP 48751 |
21.71 |
| 2026-02-10 12:00 |
09:55:19.87 |
+15:01:45.0 |
HIP 48751 |
26.17 |
| 2026-02-11 00:00 |
09:55:00.82 |
+15:03:32.7 |
HIP 48524 |
25.98 |
| 2026-02-11 12:00 |
09:54:41.75 |
+15:05:20.3 |
HIP 48524 |
24.64 |
| 2026-02-12 00:00 |
09:54:22.65 |
+15:07:07.7 |
HIP 48524 |
24.25 |
| 2026-02-12 12:00 |
09:54:03.54 |
+15:08:54.8 |
HIP 48524 |
24.85 |
| 2026-02-13 00:00 |
09:53:44.42 |
+15:10:41.7 |
HIP 48467 |
25.58 |
| 2026-02-13 12:00 |
09:53:25.29 |
+15:12:28.3 |
HIP 48467 |
22.18 |
| 2026-02-14 00:00 |
09:53:06.15 |
+15:14:14.7 |
HIP 48467 |
19.45 |
| 2026-02-14 12:00 |
09:52:47.01 |
+15:16:00.7 |
HIP 48467 |
17.72 |
| 2026-02-15 00:00 |
09:52:27.88 |
+15:17:46.4 |
HIP 48467 |
17.28 |
| 2026-02-15 12:00 |
09:52:08.75 |
+15:19:31.7 |
HIP 48467 |
18.22 |
| 2026-02-16 00:00 |
09:51:49.63 |
+15:21:16.7 |
HIP 48467 |
20.35 |
| 2026-02-16 12:00 |
09:51:30.53 |
+15:23:01.3 |
HIP 48467 |
23.34 |
| 2026-02-17 00:00 |
09:51:11.45 |
+15:24:45.4 |
HIP 48467 |
26.90 |
| 2026-02-17 12:00 |
09:50:52.39 |
+15:26:29.2 |
HIP 48151 |
29.13 |
| 2026-02-18 00:00 |
09:50:33.35 |
+15:28:12.5 |
HIP 48151 |
24.26 |
| 2026-02-18 12:00 |
09:50:14.35 |
+15:29:55.3 |
HIP 48151 |
19.42 |
| 2026-02-19 00:00 |
09:49:55.38 |
+15:31:37.6 |
HIP 48151 |
14.61 |
| 2026-02-19 12:00 |
09:49:36.45 |
+15:33:19.4 |
HIP 48151 |
9.88 |
| 2026-02-20 00:00 |
09:49:17.56 |
+15:35:00.6 |
HIP 48151 |
5.41 |
| 2026-02-20 12:00 |
09:48:58.71 |
+15:36:41.4 |
HIP 48151 |
2.83 |
| 2026-02-21 00:00 |
09:48:39.92 |
+15:38:21.5 |
HIP 48151 |
5.78 |
| 2026-02-21 12:00 |
09:48:21.18 |
+15:40:01.1 |
HIP 48151 |
10.24 |
| 2026-02-22 00:00 |
09:48:02.50 |
+15:41:40.0 |
HIP 48151 |
14.90 |
| 2026-02-22 12:00 |
09:47:43.88 |
+15:43:18.4 |
HIP 48006 |
14.38 |
| 2026-02-23 00:00 |
09:47:25.32 |
+15:44:56.1 |
HIP 48006 |
13.83 |
| 2026-02-23 12:00 |
09:47:06.83 |
+15:46:33.1 |
HIP 48006 |
14.85 |
| 2026-02-24 00:00 |
09:46:48.41 |
+15:48:09.5 |
HIP 48006 |
17.16 |