| Parameter |
Value |
| Designation |
C/2022 L4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-12-08T15:04:17.385600Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:55Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-06-04T09:30:37.209600Z |
| Discovery magnitude (MPC) |
21.40 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-06-12.0000000 |
| e |
0.98813992 |
| q (au) |
3.014561 |
| a (au) |
254.177194 |
| i (deg) |
141.223705 |
| Ω (om, deg) |
66.051128 |
| ω (w, deg) |
125.300473 |
| M (ma, deg) |
0.045086 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.841 |
| k |
0.937 |
| 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) |
| 2026-03-26 00:00 |
11:06:55.38 |
-36:11:41.9 |
HIP 54288 |
27.60 |
| 2026-03-26 12:00 |
11:06:42.05 |
-36:10:19.0 |
HIP 54288 |
25.71 |
| 2026-03-27 00:00 |
11:06:28.76 |
-36:08:55.3 |
HIP 54288 |
24.05 |
| 2026-03-27 12:00 |
11:06:15.52 |
-36:07:30.8 |
HIP 54288 |
22.66 |
| 2026-03-28 00:00 |
11:06:02.34 |
-36:06:05.7 |
HIP 54288 |
21.60 |
| 2026-03-28 12:00 |
11:05:49.20 |
-36:04:39.8 |
HIP 54173 |
19.81 |
| 2026-03-29 00:00 |
11:05:36.12 |
-36:03:13.2 |
HIP 54173 |
17.18 |
| 2026-03-29 12:00 |
11:05:23.10 |
-36:01:45.9 |
HIP 54173 |
14.70 |
| 2026-03-30 00:00 |
11:05:10.13 |
-36:00:18.0 |
HIP 54173 |
12.44 |
| 2026-03-30 12:00 |
11:04:57.21 |
-35:58:49.3 |
HIP 54173 |
10.56 |
| 2026-03-31 00:00 |
11:04:44.36 |
-35:57:20.0 |
HIP 54173 |
9.27 |
| 2026-03-31 12:00 |
11:04:31.56 |
-35:55:50.0 |
HIP 54173 |
8.84 |
| 2026-04-01 00:00 |
11:04:18.81 |
-35:54:19.4 |
HIP 54173 |
9.38 |
| 2026-04-01 12:00 |
11:04:06.13 |
-35:52:48.1 |
HIP 54173 |
10.74 |
| 2026-04-02 00:00 |
11:03:53.51 |
-35:51:16.2 |
HIP 54023 |
8.82 |
| 2026-04-02 12:00 |
11:03:40.95 |
-35:49:43.7 |
HIP 54023 |
6.07 |
| 2026-04-03 00:00 |
11:03:28.46 |
-35:48:10.6 |
HIP 54023 |
3.68 |
| 2026-04-03 12:00 |
11:03:16.02 |
-35:46:36.9 |
HIP 54023 |
2.83 |
| 2026-04-04 00:00 |
11:03:03.65 |
-35:45:02.5 |
HIP 54023 |
4.48 |
| 2026-04-04 12:00 |
11:02:51.35 |
-35:43:27.6 |
HIP 53964 |
5.98 |
| 2026-04-05 00:00 |
11:02:39.11 |
-35:41:52.1 |
HIP 53964 |
3.09 |
| 2026-04-05 12:00 |
11:02:26.94 |
-35:40:16.0 |
HIP 53964 |
0.90 |
| 2026-04-06 00:00 |
11:02:14.83 |
-35:38:39.4 |
HIP 53957 |
2.31 |
| 2026-04-06 12:00 |
11:02:02.79 |
-35:37:02.2 |
HIP 53957 |
4.02 |
| 2026-04-07 00:00 |
11:01:50.83 |
-35:35:24.5 |
HIP 53957 |
6.64 |
| 2026-04-07 12:00 |
11:01:38.93 |
-35:33:46.3 |
HIP 53957 |
9.43 |
| 2026-04-08 00:00 |
11:01:27.10 |
-35:32:07.5 |
HIP 53957 |
12.28 |
| 2026-04-08 12:00 |
11:01:15.34 |
-35:30:28.3 |
HIP 53957 |
15.14 |
| 2026-04-09 00:00 |
11:01:03.66 |
-35:28:48.5 |
HIP 53957 |
18.01 |
| 2026-04-09 12:00 |
11:00:52.04 |
-35:27:08.2 |
HIP 53957 |
20.88 |
| 2026-04-10 00:00 |
11:00:40.51 |
-35:25:27.5 |
HIP 53741 |
20.09 |
| 2026-04-10 12:00 |
11:00:29.04 |
-35:23:46.3 |
HIP 53741 |
17.44 |
| 2026-04-11 00:00 |
11:00:17.65 |
-35:22:04.6 |
HIP 53741 |
14.87 |
| 2026-04-11 12:00 |
11:00:06.34 |
-35:20:22.5 |
HIP 53741 |
12.43 |
| 2026-04-12 00:00 |
10:59:55.10 |
-35:18:40.0 |
HIP 53741 |
10.21 |
| 2026-04-12 12:00 |
10:59:43.95 |
-35:16:57.0 |
HIP 53741 |
8.38 |
| 2026-04-13 00:00 |
10:59:32.87 |
-35:15:13.6 |
HIP 53741 |
7.24 |
| 2026-04-13 12:00 |
10:59:21.86 |
-35:13:29.8 |
HIP 53741 |
7.10 |
| 2026-04-14 00:00 |
10:59:10.94 |
-35:11:45.6 |
HIP 53741 |
8.02 |
| 2026-04-14 12:00 |
10:59:00.10 |
-35:10:01.0 |
HIP 53741 |
9.69 |
| 2026-04-15 00:00 |
10:58:49.34 |
-35:08:16.0 |
HIP 53741 |
11.79 |
| 2026-04-15 12:00 |
10:58:38.66 |
-35:06:30.7 |
HIP 53741 |
14.13 |
| 2026-04-16 00:00 |
10:58:28.06 |
-35:04:45.0 |
HIP 53684 |
14.26 |