| Parameter |
Value |
| Designation |
C/2022 Y1 (Hogan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-11-27T05:12:59.653440Z |
| Orbit solution date (soln_date, UTC) |
2023-06-01T23:12:56Z |
| Obs used |
117 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-12-17T10:28:21.676800Z |
| Discovery magnitude (MPC) |
19.72 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-01-04.0000000 |
| e |
0.76423431 |
| q (au) |
2.957709 |
| a (au) |
12.545122 |
| i (deg) |
18.858872 |
| Ω (om, deg) |
285.915047 |
| ω (w, deg) |
174.737499 |
| M (ma, deg) |
0.838077 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.661 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.661 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.739 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:28:37.62 |
-30:26:42.1 |
HIP 70561 |
35.27 |
| 2026-09-20 12:00 |
14:28:50.30 |
-30:26:59.1 |
HIP 70969 |
34.84 |
| 2026-09-21 00:00 |
14:29:03.03 |
-30:27:16.6 |
HIP 70969 |
32.89 |
| 2026-09-21 12:00 |
14:29:15.82 |
-30:27:34.6 |
HIP 70969 |
31.05 |
| 2026-09-22 00:00 |
14:29:28.66 |
-30:27:53.1 |
HIP 70969 |
29.37 |
| 2026-09-22 12:00 |
14:29:41.55 |
-30:28:12.0 |
HIP 70969 |
27.86 |
| 2026-09-23 00:00 |
14:29:54.49 |
-30:28:31.4 |
HIP 70969 |
26.56 |
| 2026-09-23 12:00 |
14:30:07.48 |
-30:28:51.3 |
HIP 70969 |
25.51 |
| 2026-09-24 00:00 |
14:30:20.52 |
-30:29:11.7 |
HIP 70969 |
24.74 |
| 2026-09-24 12:00 |
14:30:33.61 |
-30:29:32.5 |
HIP 70969 |
24.29 |
| 2026-09-25 00:00 |
14:30:46.75 |
-30:29:53.8 |
HIP 70969 |
24.17 |
| 2026-09-25 12:00 |
14:30:59.93 |
-30:30:15.6 |
HIP 70969 |
24.40 |
| 2026-09-26 00:00 |
14:31:13.17 |
-30:30:37.8 |
HIP 70969 |
24.97 |
| 2026-09-26 12:00 |
14:31:26.45 |
-30:31:00.5 |
HIP 71154 |
25.18 |
| 2026-09-27 00:00 |
14:31:39.78 |
-30:31:23.7 |
HIP 71154 |
22.49 |
| 2026-09-27 12:00 |
14:31:53.15 |
-30:31:47.3 |
HIP 71154 |
19.85 |
| 2026-09-28 00:00 |
14:32:06.57 |
-30:32:11.3 |
HIP 71154 |
17.28 |
| 2026-09-28 12:00 |
14:32:20.03 |
-30:32:35.8 |
HIP 71154 |
14.83 |
| 2026-09-29 00:00 |
14:32:33.54 |
-30:33:00.8 |
HIP 71154 |
12.57 |
| 2026-09-29 12:00 |
14:32:47.10 |
-30:33:26.2 |
HIP 71154 |
10.63 |
| 2026-09-30 00:00 |
14:33:00.69 |
-30:33:52.0 |
HIP 71154 |
9.23 |
| 2026-09-30 12:00 |
14:33:14.33 |
-30:34:18.3 |
HIP 71154 |
8.65 |
| 2026-10-01 00:00 |
14:33:28.01 |
-30:34:45.0 |
HIP 71229 |
6.75 |
| 2026-10-01 12:00 |
14:33:41.74 |
-30:35:12.2 |
HIP 71229 |
3.86 |
| 2026-10-02 00:00 |
14:33:55.50 |
-30:35:39.8 |
HIP 71229 |
1.44 |
| 2026-10-02 12:00 |
14:34:09.31 |
-30:36:07.8 |
HIP 71229 |
2.69 |
| 2026-10-03 00:00 |
14:34:23.16 |
-30:36:36.3 |
HIP 71229 |
5.53 |
| 2026-10-03 12:00 |
14:34:37.05 |
-30:37:05.1 |
HIP 71229 |
8.50 |
| 2026-10-04 00:00 |
14:34:50.97 |
-30:37:34.4 |
HIP 71229 |
11.51 |
| 2026-10-04 12:00 |
14:35:04.94 |
-30:38:04.2 |
HIP 71229 |
14.53 |
| 2026-10-05 00:00 |
14:35:18.94 |
-30:38:34.3 |
HIP 71229 |
17.58 |
| 2026-10-05 12:00 |
14:35:32.99 |
-30:39:04.9 |
HIP 71229 |
20.63 |
| 2026-10-06 00:00 |
14:35:47.07 |
-30:39:35.8 |
HIP 71229 |
23.70 |
| 2026-10-06 12:00 |
14:36:01.18 |
-30:40:07.2 |
HIP 71442 |
23.47 |
| 2026-10-07 00:00 |
14:36:15.34 |
-30:40:39.0 |
HIP 71442 |
22.10 |
| 2026-10-07 12:00 |
14:36:29.52 |
-30:41:11.2 |
HIP 71442 |
21.08 |
| 2026-10-08 00:00 |
14:36:43.75 |
-30:41:43.9 |
HIP 71442 |
20.48 |
| 2026-10-08 12:00 |
14:36:58.01 |
-30:42:16.9 |
HIP 71528 |
18.48 |
| 2026-10-09 00:00 |
14:37:12.30 |
-30:42:50.3 |
HIP 71528 |
16.48 |
| 2026-10-09 12:00 |
14:37:26.62 |
-30:43:24.1 |
HIP 71528 |
14.87 |
| 2026-10-10 00:00 |
14:37:40.98 |
-30:43:58.3 |
HIP 71528 |
13.78 |
| 2026-10-10 12:00 |
14:37:55.37 |
-30:44:32.9 |
HIP 71528 |
13.35 |
| 2026-10-11 00:00 |
14:38:09.79 |
-30:45:07.9 |
HIP 71528 |
13.64 |