| 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) |
| 2026-03-26 00:00 |
20:16:15.66 |
-28:29:01.0 |
HIP 99844 |
10.96 |
| 2026-03-26 12:00 |
20:16:38.01 |
-28:28:46.8 |
HIP 99844 |
15.87 |
| 2026-03-27 00:00 |
20:17:00.25 |
-28:28:33.1 |
HIP 100071 |
16.57 |
| 2026-03-27 12:00 |
20:17:22.36 |
-28:28:20.0 |
HIP 100071 |
12.13 |
| 2026-03-28 00:00 |
20:17:44.35 |
-28:28:07.4 |
HIP 100071 |
8.22 |
| 2026-03-28 12:00 |
20:18:06.22 |
-28:27:55.3 |
HIP 100071 |
5.91 |
| 2026-03-29 00:00 |
20:18:27.97 |
-28:27:43.8 |
HIP 100071 |
6.97 |
| 2026-03-29 12:00 |
20:18:49.60 |
-28:27:32.8 |
HIP 100071 |
10.37 |
| 2026-03-30 00:00 |
20:19:11.10 |
-28:27:22.3 |
HIP 100071 |
14.54 |
| 2026-03-30 12:00 |
20:19:32.47 |
-28:27:12.4 |
HIP 100071 |
18.94 |
| 2026-03-31 00:00 |
20:19:53.72 |
-28:27:03.1 |
HIP 100071 |
23.44 |
| 2026-03-31 12:00 |
20:20:14.84 |
-28:26:54.3 |
HIP 100071 |
27.97 |
| 2026-04-01 00:00 |
20:20:35.84 |
-28:26:46.1 |
HIP 100071 |
32.51 |
| 2026-04-01 12:00 |
20:20:56.70 |
-28:26:38.5 |
HIP 100558 |
33.19 |
| 2026-04-02 00:00 |
20:21:17.44 |
-28:26:31.4 |
HIP 100558 |
28.64 |
| 2026-04-02 12:00 |
20:21:38.04 |
-28:26:25.0 |
HIP 100558 |
24.11 |
| 2026-04-03 00:00 |
20:21:58.51 |
-28:26:19.1 |
HIP 100558 |
19.61 |
| 2026-04-03 12:00 |
20:22:18.85 |
-28:26:13.9 |
HIP 100558 |
15.14 |
| 2026-04-04 00:00 |
20:22:39.06 |
-28:26:09.2 |
HIP 100558 |
10.71 |
| 2026-04-04 12:00 |
20:22:59.13 |
-28:26:05.2 |
HIP 100558 |
6.32 |
| 2026-04-05 00:00 |
20:23:19.07 |
-28:26:01.8 |
HIP 100558 |
2.03 |
| 2026-04-05 12:00 |
20:23:38.87 |
-28:25:59.0 |
HIP 100558 |
2.57 |
| 2026-04-06 00:00 |
20:23:58.53 |
-28:25:56.8 |
HIP 100558 |
6.82 |
| 2026-04-06 12:00 |
20:24:18.05 |
-28:25:55.3 |
HIP 100558 |
11.10 |
| 2026-04-07 00:00 |
20:24:37.43 |
-28:25:54.4 |
HIP 100558 |
15.35 |
| 2026-04-07 12:00 |
20:24:56.67 |
-28:25:54.2 |
HIP 100738 |
15.39 |
| 2026-04-08 00:00 |
20:25:15.77 |
-28:25:54.6 |
HIP 100738 |
14.10 |
| 2026-04-08 12:00 |
20:25:34.73 |
-28:25:55.7 |
HIP 100738 |
13.98 |
| 2026-04-09 00:00 |
20:25:53.54 |
-28:25:57.5 |
HIP 100738 |
15.03 |
| 2026-04-09 12:00 |
20:26:12.20 |
-28:26:00.0 |
HIP 100893 |
16.69 |
| 2026-04-10 00:00 |
20:26:30.72 |
-28:26:03.1 |
HIP 100893 |
12.75 |
| 2026-04-10 12:00 |
20:26:49.09 |
-28:26:07.0 |
HIP 100893 |
8.97 |
| 2026-04-11 00:00 |
20:27:07.31 |
-28:26:11.5 |
HIP 100893 |
5.56 |
| 2026-04-11 12:00 |
20:27:25.38 |
-28:26:16.7 |
HIP 100893 |
3.67 |
| 2026-04-12 00:00 |
20:27:43.30 |
-28:26:22.7 |
HIP 100893 |
5.21 |
| 2026-04-12 12:00 |
20:28:01.06 |
-28:26:29.3 |
HIP 100893 |
8.45 |
| 2026-04-13 00:00 |
20:28:18.67 |
-28:26:36.7 |
HIP 100893 |
12.05 |
| 2026-04-13 12:00 |
20:28:36.13 |
-28:26:44.9 |
HIP 100935 |
14.28 |
| 2026-04-14 00:00 |
20:28:53.43 |
-28:26:53.7 |
HIP 100935 |
17.04 |
| 2026-04-14 12:00 |
20:29:10.57 |
-28:27:03.3 |
HIP 100935 |
20.12 |
| 2026-04-15 00:00 |
20:29:27.56 |
-28:27:13.7 |
HIP 100935 |
23.38 |
| 2026-04-15 12:00 |
20:29:44.38 |
-28:27:24.8 |
HIP 101242 |
20.46 |
| 2026-04-16 00:00 |
20:30:01.04 |
-28:27:36.7 |
HIP 101242 |
16.84 |