369P/Hill
| 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) |
| 2026-02-03 00:00 |
19:30:32.90 |
-29:20:40.8 |
HIP 95991 |
11.61 |
| 2026-02-03 12:00 |
19:31:02.78 |
-29:20:03.2 |
HIP 95991 |
9.67 |
| 2026-02-04 00:00 |
19:31:32.62 |
-29:19:25.7 |
HIP 95991 |
11.74 |
| 2026-02-04 12:00 |
19:32:02.42 |
-29:18:48.2 |
HIP 95991 |
16.34 |
| 2026-02-05 00:00 |
19:32:32.20 |
-29:18:10.6 |
HIP 95991 |
21.94 |
| 2026-02-05 12:00 |
19:33:01.94 |
-29:17:33.1 |
HIP 95991 |
27.93 |
| 2026-02-06 00:00 |
19:33:31.65 |
-29:16:55.6 |
HIP 96293 |
31.85 |
| 2026-02-06 12:00 |
19:34:01.32 |
-29:16:18.1 |
HIP 96293 |
28.55 |
| 2026-02-07 00:00 |
19:34:30.96 |
-29:15:40.6 |
HIP 96293 |
26.48 |
| 2026-02-07 12:00 |
19:35:00.55 |
-29:15:03.2 |
HIP 96293 |
25.93 |
| 2026-02-08 00:00 |
19:35:30.12 |
-29:14:25.7 |
HIP 96293 |
26.97 |
| 2026-02-08 12:00 |
19:35:59.64 |
-29:13:48.3 |
HIP 96486 |
26.07 |
| 2026-02-09 00:00 |
19:36:29.12 |
-29:13:11.0 |
HIP 96486 |
24.48 |
| 2026-02-09 12:00 |
19:36:58.57 |
-29:12:33.6 |
HIP 96486 |
24.53 |
| 2026-02-10 00:00 |
19:37:27.97 |
-29:11:56.3 |
HIP 96566 |
23.61 |
| 2026-02-10 12:00 |
19:37:57.33 |
-29:11:19.1 |
HIP 96566 |
22.38 |
| 2026-02-11 00:00 |
19:38:26.65 |
-29:10:41.9 |
HIP 96566 |
22.96 |
| 2026-02-11 12:00 |
19:38:55.92 |
-29:10:04.7 |
HIP 96566 |
25.23 |
| 2026-02-12 00:00 |
19:39:25.15 |
-29:09:27.6 |
HIP 96566 |
28.78 |
| 2026-02-12 12:00 |
19:39:54.33 |
-29:08:50.6 |
HIP 96909 |
28.81 |
| 2026-02-13 00:00 |
19:40:23.47 |
-29:08:13.6 |
HIP 96909 |
23.12 |
| 2026-02-13 12:00 |
19:40:52.57 |
-29:07:36.7 |
HIP 96909 |
17.92 |
| 2026-02-14 00:00 |
19:41:21.61 |
-29:06:59.9 |
HIP 96909 |
13.75 |
| 2026-02-14 12:00 |
19:41:50.60 |
-29:06:23.1 |
HIP 96909 |
11.75 |
| 2026-02-15 00:00 |
19:42:19.55 |
-29:05:46.5 |
HIP 96909 |
12.95 |
| 2026-02-15 12:00 |
19:42:48.44 |
-29:05:09.9 |
HIP 96909 |
16.67 |
| 2026-02-16 00:00 |
19:43:17.29 |
-29:04:33.4 |
HIP 96909 |
21.63 |
| 2026-02-16 12:00 |
19:43:46.08 |
-29:03:57.0 |
HIP 97191 |
19.20 |
| 2026-02-17 00:00 |
19:44:14.82 |
-29:03:20.7 |
HIP 97191 |
13.17 |
| 2026-02-17 12:00 |
19:44:43.50 |
-29:02:44.5 |
HIP 97191 |
7.62 |
| 2026-02-18 00:00 |
19:45:12.13 |
-29:02:08.5 |
HIP 97191 |
4.68 |
| 2026-02-18 12:00 |
19:45:40.70 |
-29:01:32.5 |
HIP 97191 |
8.03 |
| 2026-02-19 00:00 |
19:46:09.22 |
-29:00:56.7 |
HIP 97191 |
13.62 |
| 2026-02-19 12:00 |
19:46:37.67 |
-29:00:21.0 |
HIP 97405 |
18.51 |
| 2026-02-20 00:00 |
19:47:06.07 |
-28:59:45.4 |
HIP 97405 |
13.90 |
| 2026-02-20 12:00 |
19:47:34.41 |
-28:59:10.0 |
HIP 97405 |
11.02 |
| 2026-02-21 00:00 |
19:48:02.69 |
-28:58:34.7 |
HIP 97405 |
11.27 |
| 2026-02-21 12:00 |
19:48:30.91 |
-28:57:59.5 |
HIP 97515 |
13.89 |
| 2026-02-22 00:00 |
19:48:59.06 |
-28:57:24.5 |
HIP 97515 |
10.45 |
| 2026-02-22 12:00 |
19:49:27.15 |
-28:56:49.6 |
HIP 97515 |
10.10 |
| 2026-02-23 00:00 |
19:49:55.18 |
-28:56:14.9 |
HIP 97515 |
13.08 |
| 2026-02-23 12:00 |
19:50:23.15 |
-28:55:40.4 |
HIP 97515 |
17.77 |
| 2026-02-24 00:00 |
19:50:51.05 |
-28:55:06.0 |
HIP 97515 |
23.14 |