| Parameter |
Value |
| Designation |
P/2025 U1 (Hogan) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-03-25T17:52:27.557760Z |
| Orbit solution date (soln_date, UTC) |
2026-08-07T12:42:16Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-10-30T12:01:04.713600Z |
| Discovery magnitude (MPC) |
20.84 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-01-12.0000000 |
| e |
0.29434152 |
| q (au) |
4.165963 |
| a (au) |
5.903654 |
| i (deg) |
23.831346 |
| Ω (om, deg) |
234.957301 |
| ω (w, deg) |
263.997388 |
| M (ma, deg) |
355.001675 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.342 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.342 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.700 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-09-20 00:00 |
10:40:43.22 |
-11:37:35.8 |
HIP 52225 |
8.12 |
| 2026-09-20 12:00 |
10:41:15.86 |
-11:40:57.1 |
HIP 52225 |
16.79 |
| 2026-09-21 00:00 |
10:41:48.46 |
-11:44:18.8 |
HIP 52225 |
25.45 |
| 2026-09-21 12:00 |
10:42:21.03 |
-11:47:41.0 |
HIP 52279 |
31.53 |
| 2026-09-22 00:00 |
10:42:53.56 |
-11:51:03.6 |
HIP 52279 |
35.07 |
| 2026-09-22 12:00 |
10:43:26.06 |
-11:54:26.7 |
HIP 52279 |
40.18 |
| 2026-09-23 00:00 |
10:43:58.53 |
-11:57:50.2 |
HIP 52750 |
46.19 |
| 2026-09-23 12:00 |
10:44:30.96 |
-12:01:14.1 |
HIP 52750 |
38.13 |
| 2026-09-24 00:00 |
10:45:03.35 |
-12:04:38.4 |
HIP 52750 |
30.40 |
| 2026-09-24 12:00 |
10:45:35.71 |
-12:08:03.2 |
HIP 52750 |
23.32 |
| 2026-09-25 00:00 |
10:46:08.03 |
-12:11:28.4 |
HIP 52750 |
17.67 |
| 2026-09-25 12:00 |
10:46:40.31 |
-12:14:53.9 |
HIP 52750 |
15.15 |
| 2026-09-26 00:00 |
10:47:12.56 |
-12:18:19.9 |
HIP 52750 |
17.18 |
| 2026-09-26 12:00 |
10:47:44.77 |
-12:21:46.3 |
HIP 52819 |
16.44 |
| 2026-09-27 00:00 |
10:48:16.94 |
-12:25:13.1 |
HIP 52819 |
13.66 |
| 2026-09-27 12:00 |
10:48:49.07 |
-12:28:40.3 |
HIP 52819 |
15.79 |
| 2026-09-28 00:00 |
10:49:21.16 |
-12:32:07.8 |
HIP 52819 |
21.41 |
| 2026-09-28 12:00 |
10:49:53.21 |
-12:35:35.8 |
HIP 53058 |
25.44 |
| 2026-09-29 00:00 |
10:50:25.23 |
-12:39:04.1 |
HIP 53058 |
17.03 |
| 2026-09-29 12:00 |
10:50:57.20 |
-12:42:32.8 |
HIP 53058 |
8.88 |
| 2026-09-30 00:00 |
10:51:29.13 |
-12:46:01.9 |
HIP 53058 |
3.69 |
| 2026-09-30 12:00 |
10:52:01.02 |
-12:49:31.4 |
HIP 53058 |
9.68 |
| 2026-10-01 00:00 |
10:52:32.87 |
-12:53:01.2 |
HIP 53058 |
17.85 |
| 2026-10-01 12:00 |
10:53:04.67 |
-12:56:31.4 |
HIP 53058 |
26.22 |
| 2026-10-02 00:00 |
10:53:36.43 |
-13:00:01.9 |
HIP 53290 |
34.32 |
| 2026-10-02 12:00 |
10:54:08.15 |
-13:03:32.8 |
HIP 53409 |
29.51 |
| 2026-10-03 00:00 |
10:54:39.83 |
-13:07:04.0 |
HIP 53409 |
22.12 |
| 2026-10-03 12:00 |
10:55:11.46 |
-13:10:35.6 |
HIP 53409 |
15.85 |
| 2026-10-04 00:00 |
10:55:43.04 |
-13:14:07.5 |
HIP 53409 |
12.50 |
| 2026-10-04 12:00 |
10:56:14.58 |
-13:17:39.8 |
HIP 53409 |
14.28 |
| 2026-10-05 00:00 |
10:56:46.08 |
-13:21:12.4 |
HIP 53409 |
19.85 |
| 2026-10-05 12:00 |
10:57:17.52 |
-13:24:45.3 |
HIP 53409 |
26.93 |
| 2026-10-06 00:00 |
10:57:48.92 |
-13:28:18.5 |
HIP 53409 |
34.61 |
| 2026-10-06 12:00 |
10:58:20.27 |
-13:31:52.0 |
HIP 53770 |
28.85 |
| 2026-10-07 00:00 |
10:58:51.57 |
-13:35:25.9 |
HIP 53770 |
24.31 |
| 2026-10-07 12:00 |
10:59:22.82 |
-13:39:00.0 |
HIP 53770 |
22.17 |
| 2026-10-08 00:00 |
10:59:54.02 |
-13:42:34.4 |
HIP 53778 |
22.83 |
| 2026-10-08 12:00 |
11:00:25.17 |
-13:46:09.2 |
HIP 53778 |
19.13 |
| 2026-10-09 00:00 |
11:00:56.27 |
-13:49:44.2 |
HIP 53778 |
18.70 |
| 2026-10-09 12:00 |
11:01:27.32 |
-13:53:19.4 |
HIP 53778 |
21.74 |
| 2026-10-10 00:00 |
11:01:58.31 |
-13:56:55.0 |
HIP 53778 |
27.09 |
| 2026-10-10 12:00 |
11:02:29.25 |
-14:00:30.8 |
HIP 53778 |
33.66 |
| 2026-10-11 00:00 |
11:03:00.13 |
-14:04:06.9 |
HIP 54090 |
32.40 |