C/2022 Y1 (Hogan)
| 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 · 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 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
14:47:36.96 |
-33:47:58.2 |
HIP 72235 |
15.62 |
| 2026-02-03 12:00 |
14:47:40.97 |
-33:49:07.3 |
HIP 72235 |
16.62 |
| 2026-02-04 00:00 |
14:47:44.86 |
-33:50:16.0 |
HIP 72235 |
17.66 |
| 2026-02-04 12:00 |
14:47:48.61 |
-33:51:24.3 |
HIP 72235 |
18.71 |
| 2026-02-05 00:00 |
14:47:52.23 |
-33:52:32.1 |
HIP 72485 |
19.64 |
| 2026-02-05 12:00 |
14:47:55.72 |
-33:53:39.6 |
HIP 72485 |
18.50 |
| 2026-02-06 00:00 |
14:47:59.08 |
-33:54:46.5 |
HIP 72485 |
17.43 |
| 2026-02-06 12:00 |
14:48:02.30 |
-33:55:53.0 |
HIP 72485 |
16.41 |
| 2026-02-07 00:00 |
14:48:05.39 |
-33:56:59.1 |
HIP 72485 |
15.47 |
| 2026-02-07 12:00 |
14:48:08.35 |
-33:58:04.7 |
HIP 72485 |
14.61 |
| 2026-02-08 00:00 |
14:48:11.17 |
-33:59:09.8 |
HIP 72485 |
13.84 |
| 2026-02-08 12:00 |
14:48:13.85 |
-34:00:14.5 |
HIP 72485 |
13.16 |
| 2026-02-09 00:00 |
14:48:16.41 |
-34:01:18.7 |
HIP 72485 |
12.60 |
| 2026-02-09 12:00 |
14:48:18.82 |
-34:02:22.4 |
HIP 72485 |
12.15 |
| 2026-02-10 00:00 |
14:48:21.10 |
-34:03:25.7 |
HIP 72485 |
11.83 |
| 2026-02-10 12:00 |
14:48:23.25 |
-34:04:28.4 |
HIP 72485 |
11.64 |
| 2026-02-11 00:00 |
14:48:25.26 |
-34:05:30.6 |
HIP 72484 |
11.01 |
| 2026-02-11 12:00 |
14:48:27.13 |
-34:06:32.4 |
HIP 72484 |
10.44 |
| 2026-02-12 00:00 |
14:48:28.87 |
-34:07:33.6 |
HIP 72484 |
9.99 |
| 2026-02-12 12:00 |
14:48:30.47 |
-34:08:34.4 |
HIP 72484 |
9.67 |
| 2026-02-13 00:00 |
14:48:31.93 |
-34:09:34.6 |
HIP 72484 |
9.49 |
| 2026-02-13 12:00 |
14:48:33.25 |
-34:10:34.3 |
HIP 72484 |
9.44 |
| 2026-02-14 00:00 |
14:48:34.44 |
-34:11:33.4 |
HIP 72484 |
9.53 |
| 2026-02-14 12:00 |
14:48:35.49 |
-34:12:32.1 |
HIP 72484 |
9.75 |
| 2026-02-15 00:00 |
14:48:36.40 |
-34:13:30.2 |
HIP 72484 |
10.08 |
| 2026-02-15 12:00 |
14:48:37.18 |
-34:14:27.7 |
HIP 72484 |
10.51 |
| 2026-02-16 00:00 |
14:48:37.82 |
-34:15:24.7 |
HIP 72484 |
11.02 |
| 2026-02-16 12:00 |
14:48:38.32 |
-34:16:21.2 |
HIP 72484 |
11.61 |
| 2026-02-17 00:00 |
14:48:38.68 |
-34:17:17.1 |
HIP 72484 |
12.25 |
| 2026-02-17 12:00 |
14:48:38.90 |
-34:18:12.4 |
HIP 72484 |
12.94 |
| 2026-02-18 00:00 |
14:48:38.98 |
-34:19:07.2 |
HIP 72484 |
13.66 |
| 2026-02-18 12:00 |
14:48:38.93 |
-34:20:01.4 |
HIP 72484 |
14.41 |
| 2026-02-19 00:00 |
14:48:38.74 |
-34:20:55.0 |
HIP 72484 |
15.19 |
| 2026-02-19 12:00 |
14:48:38.41 |
-34:21:48.0 |
HIP 72484 |
15.98 |
| 2026-02-20 00:00 |
14:48:37.94 |
-34:22:40.5 |
HIP 72484 |
16.79 |
| 2026-02-20 12:00 |
14:48:37.34 |
-34:23:32.3 |
HIP 72484 |
17.61 |
| 2026-02-21 00:00 |
14:48:36.60 |
-34:24:23.6 |
HIP 72484 |
18.44 |
| 2026-02-21 12:00 |
14:48:35.71 |
-34:25:14.2 |
HIP 72484 |
19.27 |
| 2026-02-22 00:00 |
14:48:34.70 |
-34:26:04.2 |
HIP 72484 |
20.11 |
| 2026-02-22 12:00 |
14:48:33.54 |
-34:26:53.7 |
HIP 72350 |
20.29 |
| 2026-02-23 00:00 |
14:48:32.25 |
-34:27:42.5 |
HIP 72350 |
19.46 |
| 2026-02-23 12:00 |
14:48:30.82 |
-34:28:30.7 |
HIP 72350 |
18.63 |
| 2026-02-24 00:00 |
14:48:29.26 |
-34:29:18.2 |
HIP 72350 |
17.79 |