| Parameter |
Value |
| Designation |
P/2025 U1 (Hogan) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-03-25T17:36:04.040640Z |
| Orbit solution date (soln_date, UTC) |
2026-05-22T14:12:29Z |
| Obs used |
87 |
| 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) |
2026-01-09.0000000 |
| e |
0.29436323 |
| q (au) |
4.165966 |
| a (au) |
5.903839 |
| i (deg) |
23.831475 |
| Ω (om, deg) |
234.958432 |
| ω (w, deg) |
263.994932 |
| M (ma, deg) |
354.796571 |
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) |
| 2026-06-01 00:00 |
08:41:49.53 |
-04:38:34.9 |
HIP 42634 |
12.60 |
| 2026-06-01 12:00 |
08:42:16.36 |
-04:38:29.5 |
HIP 42759 |
8.24 |
| 2026-06-02 00:00 |
08:42:43.29 |
-04:38:25.4 |
HIP 42759 |
1.77 |
| 2026-06-02 12:00 |
08:43:10.32 |
-04:38:22.5 |
HIP 42759 |
5.36 |
| 2026-06-03 00:00 |
08:43:37.46 |
-04:38:20.9 |
HIP 42759 |
12.07 |
| 2026-06-03 12:00 |
08:44:04.69 |
-04:38:20.6 |
HIP 42759 |
18.85 |
| 2026-06-04 00:00 |
08:44:32.03 |
-04:38:21.6 |
HIP 42759 |
25.65 |
| 2026-06-04 12:00 |
08:44:59.46 |
-04:38:23.8 |
HIP 43072 |
21.31 |
| 2026-06-05 00:00 |
08:45:26.99 |
-04:38:27.4 |
HIP 43072 |
14.66 |
| 2026-06-05 12:00 |
08:45:54.61 |
-04:38:32.1 |
HIP 43072 |
8.35 |
| 2026-06-06 00:00 |
08:46:22.33 |
-04:38:38.2 |
HIP 43072 |
4.41 |
| 2026-06-06 12:00 |
08:46:50.15 |
-04:38:45.5 |
HIP 43072 |
8.08 |
| 2026-06-07 00:00 |
08:47:18.06 |
-04:38:54.1 |
HIP 43072 |
14.42 |
| 2026-06-07 12:00 |
08:47:46.06 |
-04:39:03.9 |
HIP 43072 |
21.18 |
| 2026-06-08 00:00 |
08:48:14.16 |
-04:39:15.0 |
HIP 43072 |
28.07 |
| 2026-06-08 12:00 |
08:48:42.35 |
-04:39:27.4 |
HIP 43417 |
28.51 |
| 2026-06-09 00:00 |
08:49:10.62 |
-04:39:41.0 |
HIP 43417 |
21.48 |
| 2026-06-09 12:00 |
08:49:38.99 |
-04:39:55.9 |
HIP 43417 |
14.43 |
| 2026-06-10 00:00 |
08:50:07.45 |
-04:40:12.0 |
HIP 43417 |
7.41 |
| 2026-06-10 12:00 |
08:50:35.99 |
-04:40:29.4 |
HIP 43417 |
1.49 |
| 2026-06-11 00:00 |
08:51:04.62 |
-04:40:48.1 |
HIP 43417 |
7.14 |
| 2026-06-11 12:00 |
08:51:33.34 |
-04:41:08.0 |
HIP 43417 |
14.23 |
| 2026-06-12 00:00 |
08:52:02.14 |
-04:41:29.2 |
HIP 43417 |
21.39 |
| 2026-06-12 12:00 |
08:52:31.03 |
-04:41:51.6 |
HIP 43724 |
27.24 |
| 2026-06-13 00:00 |
08:53:00.01 |
-04:42:15.3 |
HIP 43724 |
20.59 |
| 2026-06-13 12:00 |
08:53:29.06 |
-04:42:40.3 |
HIP 43724 |
14.49 |
| 2026-06-14 00:00 |
08:53:58.20 |
-04:43:06.5 |
HIP 43724 |
10.08 |
| 2026-06-14 12:00 |
08:54:27.42 |
-04:43:33.9 |
HIP 43724 |
9.97 |
| 2026-06-15 00:00 |
08:54:56.72 |
-04:44:02.6 |
HIP 43724 |
14.30 |
| 2026-06-15 12:00 |
08:55:26.10 |
-04:44:32.6 |
HIP 43724 |
20.44 |
| 2026-06-16 00:00 |
08:55:55.55 |
-04:45:03.7 |
HIP 43924 |
13.76 |
| 2026-06-16 12:00 |
08:56:25.09 |
-04:45:36.2 |
HIP 43924 |
6.65 |
| 2026-06-17 00:00 |
08:56:54.70 |
-04:46:09.8 |
HIP 43924 |
2.87 |
| 2026-06-17 12:00 |
08:57:24.39 |
-04:46:44.8 |
HIP 43924 |
9.06 |
| 2026-06-18 00:00 |
08:57:54.15 |
-04:47:20.9 |
HIP 44030 |
4.34 |
| 2026-06-18 12:00 |
08:58:23.98 |
-04:47:58.3 |
HIP 44030 |
7.29 |
| 2026-06-19 00:00 |
08:58:53.89 |
-04:48:36.9 |
HIP 44173 |
13.90 |
| 2026-06-19 12:00 |
08:59:23.87 |
-04:49:16.7 |
HIP 44173 |
6.70 |
| 2026-06-20 00:00 |
08:59:53.91 |
-04:49:57.7 |
HIP 44173 |
3.05 |
| 2026-06-20 12:00 |
09:00:24.03 |
-04:50:40.0 |
HIP 44173 |
9.33 |
| 2026-06-21 00:00 |
09:00:54.22 |
-04:51:23.4 |
HIP 44173 |
16.71 |
| 2026-06-21 12:00 |
09:01:24.47 |
-04:52:08.1 |
HIP 44269 |
22.74 |
| 2026-06-22 00:00 |
09:01:54.79 |
-04:52:54.0 |
HIP 44316 |
26.20 |