| Parameter |
Value |
| Designation |
C/2022 H1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-01-19T11:06:56.177280Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:12:45Z |
| Obs used |
74 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
5.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-04-21T08:36:18.201600Z |
| Discovery magnitude (MPC) |
20.66 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-09-07.0000000 |
| e |
0.99347679 |
| q (au) |
7.689370 |
| a (au) |
1178.770272 |
| i (deg) |
49.866897 |
| Ω (om, deg) |
6.365450 |
| ω (w, deg) |
246.327042 |
| M (ma, deg) |
359.987836 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.285 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.285 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.833 |
| k |
0.800 |
| δ90 |
9.425 |
| 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) |
| 2026-03-26 00:00 |
22:35:51.86 |
-55:17:21.8 |
HIP 111501 |
7.31 |
| 2026-03-26 12:00 |
22:36:14.50 |
-55:16:35.0 |
HIP 111501 |
8.86 |
| 2026-03-27 00:00 |
22:36:37.06 |
-55:15:49.0 |
HIP 111501 |
11.20 |
| 2026-03-27 12:00 |
22:36:59.54 |
-55:15:04.0 |
HIP 111501 |
13.93 |
| 2026-03-28 00:00 |
22:37:21.93 |
-55:14:19.9 |
HIP 111736 |
15.12 |
| 2026-03-28 12:00 |
22:37:44.23 |
-55:13:36.7 |
HIP 111736 |
14.92 |
| 2026-03-29 00:00 |
22:38:06.45 |
-55:12:54.5 |
HIP 111851 |
11.73 |
| 2026-03-29 12:00 |
22:38:28.58 |
-55:12:13.2 |
HIP 111851 |
8.53 |
| 2026-03-30 00:00 |
22:38:50.62 |
-55:11:32.9 |
HIP 111851 |
5.37 |
| 2026-03-30 12:00 |
22:39:12.58 |
-55:10:53.5 |
HIP 111851 |
2.38 |
| 2026-03-31 00:00 |
22:39:34.44 |
-55:10:15.0 |
HIP 111851 |
1.75 |
| 2026-03-31 12:00 |
22:39:56.22 |
-55:09:37.4 |
HIP 111851 |
4.54 |
| 2026-04-01 00:00 |
22:40:17.91 |
-55:09:00.8 |
HIP 111851 |
7.63 |
| 2026-04-01 12:00 |
22:40:39.51 |
-55:08:25.2 |
HIP 111851 |
10.74 |
| 2026-04-02 00:00 |
22:41:01.02 |
-55:07:50.4 |
HIP 111851 |
13.86 |
| 2026-04-02 12:00 |
22:41:22.44 |
-55:07:16.6 |
HIP 111851 |
16.96 |
| 2026-04-03 00:00 |
22:41:43.77 |
-55:06:43.8 |
HIP 111851 |
20.06 |
| 2026-04-03 12:00 |
22:42:05.00 |
-55:06:11.9 |
HIP 111851 |
23.14 |
| 2026-04-04 00:00 |
22:42:26.14 |
-55:05:40.9 |
HIP 111851 |
26.20 |
| 2026-04-04 12:00 |
22:42:47.20 |
-55:05:10.9 |
HIP 112408 |
28.31 |
| 2026-04-05 00:00 |
22:43:08.15 |
-55:04:41.8 |
HIP 112408 |
25.29 |
| 2026-04-05 12:00 |
22:43:29.02 |
-55:04:13.7 |
HIP 112408 |
22.30 |
| 2026-04-06 00:00 |
22:43:49.78 |
-55:03:46.5 |
HIP 112408 |
19.32 |
| 2026-04-06 12:00 |
22:44:10.46 |
-55:03:20.3 |
HIP 112408 |
16.37 |
| 2026-04-07 00:00 |
22:44:31.03 |
-55:02:55.0 |
HIP 112408 |
13.45 |
| 2026-04-07 12:00 |
22:44:51.52 |
-55:02:30.7 |
HIP 112408 |
10.57 |
| 2026-04-08 00:00 |
22:45:11.90 |
-55:02:07.3 |
HIP 112408 |
7.75 |
| 2026-04-08 12:00 |
22:45:32.19 |
-55:01:44.9 |
HIP 112408 |
5.10 |
| 2026-04-09 00:00 |
22:45:52.37 |
-55:01:23.5 |
HIP 112408 |
3.00 |
| 2026-04-09 12:00 |
22:46:12.46 |
-55:01:02.9 |
HIP 112408 |
2.98 |
| 2026-04-10 00:00 |
22:46:32.45 |
-55:00:43.4 |
HIP 112408 |
5.03 |
| 2026-04-10 12:00 |
22:46:52.34 |
-55:00:24.8 |
HIP 112408 |
7.62 |
| 2026-04-11 00:00 |
22:47:12.13 |
-55:00:07.1 |
HIP 112408 |
10.34 |
| 2026-04-11 12:00 |
22:47:31.82 |
-54:59:50.5 |
HIP 112408 |
13.10 |
| 2026-04-12 00:00 |
22:47:51.40 |
-54:59:34.7 |
HIP 112408 |
15.86 |
| 2026-04-12 12:00 |
22:48:10.89 |
-54:59:20.0 |
HIP 112408 |
18.62 |
| 2026-04-13 00:00 |
22:48:30.26 |
-54:59:06.2 |
HIP 112750 |
19.78 |
| 2026-04-13 12:00 |
22:48:49.54 |
-54:58:53.3 |
HIP 112750 |
18.28 |
| 2026-04-14 00:00 |
22:49:08.71 |
-54:58:41.4 |
HIP 112750 |
17.08 |
| 2026-04-14 12:00 |
22:49:27.77 |
-54:58:30.5 |
HIP 112750 |
16.25 |
| 2026-04-15 00:00 |
22:49:46.73 |
-54:58:20.5 |
HIP 112750 |
15.83 |
| 2026-04-15 12:00 |
22:50:05.57 |
-54:58:11.5 |
HIP 112798 |
15.51 |
| 2026-04-16 00:00 |
22:50:24.32 |
-54:58:03.5 |
HIP 112798 |
15.16 |