C/2022 H1 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
21:51:48.19 |
-57:52:42.8 |
HIP 108177 |
26.86 |
| 2026-02-03 12:00 |
21:52:16.31 |
-57:50:32.2 |
HIP 108177 |
24.20 |
| 2026-02-04 00:00 |
21:52:44.40 |
-57:48:22.2 |
HIP 108177 |
22.06 |
| 2026-02-04 12:00 |
21:53:12.47 |
-57:46:12.9 |
HIP 108177 |
20.60 |
| 2026-02-05 00:00 |
21:53:40.52 |
-57:44:04.3 |
HIP 108177 |
19.97 |
| 2026-02-05 12:00 |
21:54:08.54 |
-57:41:56.4 |
HIP 108177 |
20.24 |
| 2026-02-06 00:00 |
21:54:36.53 |
-57:39:49.2 |
HIP 108281 |
19.22 |
| 2026-02-06 12:00 |
21:55:04.50 |
-57:37:42.6 |
HIP 108281 |
18.72 |
| 2026-02-07 00:00 |
21:55:32.44 |
-57:35:36.8 |
HIP 108281 |
19.18 |
| 2026-02-07 12:00 |
21:56:00.35 |
-57:33:31.7 |
HIP 108472 |
19.84 |
| 2026-02-08 00:00 |
21:56:28.24 |
-57:31:27.2 |
HIP 108472 |
16.02 |
| 2026-02-08 12:00 |
21:56:56.10 |
-57:29:23.5 |
HIP 108472 |
12.48 |
| 2026-02-09 00:00 |
21:57:23.93 |
-57:27:20.5 |
HIP 108472 |
9.56 |
| 2026-02-09 12:00 |
21:57:51.73 |
-57:25:18.2 |
HIP 108472 |
7.94 |
| 2026-02-10 00:00 |
21:58:19.49 |
-57:23:16.6 |
HIP 108472 |
8.40 |
| 2026-02-10 12:00 |
21:58:47.23 |
-57:21:15.7 |
HIP 108472 |
10.68 |
| 2026-02-11 00:00 |
21:59:14.94 |
-57:19:15.6 |
HIP 108472 |
13.90 |
| 2026-02-11 12:00 |
21:59:42.61 |
-57:17:16.2 |
HIP 108472 |
17.54 |
| 2026-02-12 00:00 |
22:00:10.25 |
-57:15:17.5 |
HIP 108472 |
21.39 |
| 2026-02-12 12:00 |
22:00:37.86 |
-57:13:19.5 |
HIP 108832 |
18.14 |
| 2026-02-13 00:00 |
22:01:05.44 |
-57:11:22.3 |
HIP 108832 |
14.92 |
| 2026-02-13 12:00 |
22:01:32.98 |
-57:09:25.9 |
HIP 108832 |
12.31 |
| 2026-02-14 00:00 |
22:02:00.48 |
-57:07:30.1 |
HIP 108832 |
10.75 |
| 2026-02-14 12:00 |
22:02:27.95 |
-57:05:35.1 |
HIP 108832 |
10.69 |
| 2026-02-15 00:00 |
22:02:55.38 |
-57:03:40.9 |
HIP 108832 |
12.16 |
| 2026-02-15 12:00 |
22:03:22.77 |
-57:01:47.5 |
HIP 108832 |
14.70 |
| 2026-02-16 00:00 |
22:03:50.13 |
-56:59:54.7 |
HIP 108870 |
13.86 |
| 2026-02-16 12:00 |
22:04:17.44 |
-56:58:02.8 |
HIP 108870 |
13.93 |
| 2026-02-17 00:00 |
22:04:44.72 |
-56:56:11.6 |
HIP 108870 |
15.19 |
| 2026-02-17 12:00 |
22:05:11.96 |
-56:54:21.2 |
HIP 108870 |
17.39 |
| 2026-02-18 00:00 |
22:05:39.16 |
-56:52:31.6 |
HIP 109227 |
16.51 |
| 2026-02-18 12:00 |
22:06:06.31 |
-56:50:42.7 |
HIP 109227 |
12.74 |
| 2026-02-19 00:00 |
22:06:33.42 |
-56:48:54.6 |
HIP 109227 |
9.29 |
| 2026-02-19 12:00 |
22:07:00.49 |
-56:47:07.3 |
HIP 109227 |
6.63 |
| 2026-02-20 00:00 |
22:07:27.52 |
-56:45:20.8 |
HIP 109227 |
5.95 |
| 2026-02-20 12:00 |
22:07:54.50 |
-56:43:35.0 |
HIP 109227 |
7.76 |
| 2026-02-21 00:00 |
22:08:21.44 |
-56:41:50.1 |
HIP 109227 |
10.87 |
| 2026-02-21 12:00 |
22:08:48.33 |
-56:40:05.9 |
HIP 109227 |
14.46 |
| 2026-02-22 00:00 |
22:09:15.17 |
-56:38:22.6 |
HIP 109504 |
15.78 |
| 2026-02-22 12:00 |
22:09:41.97 |
-56:36:40.0 |
HIP 109504 |
13.52 |
| 2026-02-23 00:00 |
22:10:08.72 |
-56:34:58.3 |
HIP 109504 |
12.21 |
| 2026-02-23 12:00 |
22:10:35.42 |
-56:33:17.3 |
HIP 109538 |
10.18 |
| 2026-02-24 00:00 |
22:11:02.07 |
-56:31:37.1 |
HIP 109538 |
6.97 |