| Parameter |
Value |
| Designation |
369P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-14T18:02:25.463040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:38Z |
| Obs used |
404 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-08-10T04:19:55.200000Z |
| Discovery magnitude (MPC) |
19.00 N |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-03-03.0000000 |
| e |
0.55464071 |
| q (au) |
1.952852 |
| a (au) |
4.384892 |
| i (deg) |
10.318441 |
| Ω (om, deg) |
47.369507 |
| ω (w, deg) |
13.332806 |
| M (ma, deg) |
218.121804 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.079 + 4.801\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.079 |
| n |
4.801 |
| gf |
0.800 |
| gb |
-0.671 |
| k |
0.929 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
19:41:23.78 |
-32:59:33.0 |
HIP 96854 |
7.47 |
| 2026-09-25 12:00 |
19:41:24.25 |
-32:58:17.4 |
HIP 96854 |
6.31 |
| 2026-09-26 00:00 |
19:41:25.03 |
-32:57:01.0 |
HIP 96854 |
5.21 |
| 2026-09-26 12:00 |
19:41:26.12 |
-32:55:43.9 |
HIP 96854 |
4.24 |
| 2026-09-27 00:00 |
19:41:27.51 |
-32:54:26.0 |
HIP 96854 |
3.55 |
| 2026-09-27 12:00 |
19:41:29.21 |
-32:53:07.4 |
HIP 96891 |
3.26 |
| 2026-09-28 00:00 |
19:41:31.21 |
-32:51:48.0 |
HIP 96891 |
2.76 |
| 2026-09-28 12:00 |
19:41:33.52 |
-32:50:27.9 |
HIP 96891 |
2.87 |
| 2026-09-29 00:00 |
19:41:36.13 |
-32:49:07.1 |
HIP 96891 |
3.57 |
| 2026-09-29 12:00 |
19:41:39.04 |
-32:47:45.6 |
HIP 96891 |
4.63 |
| 2026-09-30 00:00 |
19:41:42.26 |
-32:46:23.4 |
HIP 96891 |
5.88 |
| 2026-09-30 12:00 |
19:41:45.78 |
-32:45:00.5 |
HIP 96891 |
7.26 |
| 2026-10-01 00:00 |
19:41:49.60 |
-32:43:36.9 |
HIP 96891 |
8.72 |
| 2026-10-01 12:00 |
19:41:53.73 |
-32:42:12.6 |
HIP 96891 |
10.25 |
| 2026-10-02 00:00 |
19:41:58.15 |
-32:40:47.6 |
HIP 96891 |
11.84 |
| 2026-10-02 12:00 |
19:42:02.88 |
-32:39:21.9 |
HIP 96891 |
13.48 |
| 2026-10-03 00:00 |
19:42:07.90 |
-32:37:55.6 |
HIP 96891 |
15.18 |
| 2026-10-03 12:00 |
19:42:13.23 |
-32:36:28.7 |
HIP 97055 |
16.76 |
| 2026-10-04 00:00 |
19:42:18.85 |
-32:35:01.0 |
HIP 97055 |
15.21 |
| 2026-10-04 12:00 |
19:42:24.77 |
-32:33:32.7 |
HIP 97055 |
13.69 |
| 2026-10-05 00:00 |
19:42:30.99 |
-32:32:03.8 |
HIP 97055 |
12.22 |
| 2026-10-05 12:00 |
19:42:37.50 |
-32:30:34.2 |
HIP 97055 |
10.85 |
| 2026-10-06 00:00 |
19:42:44.32 |
-32:29:04.0 |
HIP 97055 |
9.66 |
| 2026-10-06 12:00 |
19:42:51.42 |
-32:27:33.2 |
HIP 97055 |
8.75 |
| 2026-10-07 00:00 |
19:42:58.83 |
-32:26:01.7 |
HIP 97055 |
8.25 |
| 2026-10-07 12:00 |
19:43:06.52 |
-32:24:29.6 |
HIP 97055 |
8.29 |
| 2026-10-08 00:00 |
19:43:14.51 |
-32:22:56.9 |
HIP 97055 |
8.89 |
| 2026-10-08 12:00 |
19:43:22.79 |
-32:21:23.6 |
HIP 97055 |
10.00 |
| 2026-10-09 00:00 |
19:43:31.36 |
-32:19:49.7 |
HIP 97055 |
11.50 |
| 2026-10-09 12:00 |
19:43:40.23 |
-32:18:15.2 |
HIP 97055 |
13.28 |
| 2026-10-10 00:00 |
19:43:49.38 |
-32:16:40.1 |
HIP 97055 |
15.27 |
| 2026-10-10 12:00 |
19:43:58.82 |
-32:15:04.4 |
HIP 97055 |
17.43 |
| 2026-10-11 00:00 |
19:44:08.55 |
-32:13:28.1 |
HIP 96964 |
19.70 |
| 2026-10-11 12:00 |
19:44:18.56 |
-32:11:51.2 |
HIP 96964 |
21.95 |
| 2026-10-12 00:00 |
19:44:28.86 |
-32:10:13.7 |
HIP 96964 |
24.34 |
| 2026-10-12 12:00 |
19:44:39.45 |
-32:08:35.7 |
HIP 97260 |
22.33 |
| 2026-10-13 00:00 |
19:44:50.31 |
-32:06:57.1 |
HIP 97260 |
19.51 |
| 2026-10-13 12:00 |
19:45:01.46 |
-32:05:18.0 |
HIP 97260 |
16.64 |
| 2026-10-14 00:00 |
19:45:12.89 |
-32:03:38.2 |
HIP 97260 |
13.72 |
| 2026-10-14 12:00 |
19:45:24.59 |
-32:01:58.0 |
HIP 97260 |
10.77 |
| 2026-10-15 00:00 |
19:45:36.57 |
-32:00:17.1 |
HIP 97260 |
7.79 |
| 2026-10-15 12:00 |
19:45:48.83 |
-31:58:35.7 |
HIP 97260 |
4.86 |
| 2026-10-16 00:00 |
19:46:01.37 |
-31:56:53.8 |
HIP 97260 |
2.38 |