C/2022 L4 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
11:30:16.32 |
-37:09:38.7 |
HIP 56152 |
23.76 |
| 2026-02-03 12:00 |
11:30:04.28 |
-37:09:56.8 |
HIP 56152 |
24.53 |
| 2026-02-04 00:00 |
11:29:52.17 |
-37:10:13.9 |
HIP 55940 |
24.68 |
| 2026-02-04 12:00 |
11:29:39.99 |
-37:10:30.0 |
HIP 55940 |
22.29 |
| 2026-02-05 00:00 |
11:29:27.75 |
-37:10:45.1 |
HIP 55940 |
19.90 |
| 2026-02-05 12:00 |
11:29:15.43 |
-37:10:59.2 |
HIP 55940 |
17.51 |
| 2026-02-06 00:00 |
11:29:03.05 |
-37:11:12.3 |
HIP 55940 |
15.15 |
| 2026-02-06 12:00 |
11:28:50.60 |
-37:11:24.3 |
HIP 55940 |
12.83 |
| 2026-02-07 00:00 |
11:28:38.09 |
-37:11:35.4 |
HIP 55940 |
10.58 |
| 2026-02-07 12:00 |
11:28:25.51 |
-37:11:45.4 |
HIP 55940 |
8.47 |
| 2026-02-08 00:00 |
11:28:12.87 |
-37:11:54.3 |
HIP 55940 |
6.66 |
| 2026-02-08 12:00 |
11:28:00.17 |
-37:12:02.3 |
HIP 55940 |
5.45 |
| 2026-02-09 00:00 |
11:27:47.40 |
-37:12:09.2 |
HIP 55940 |
5.30 |
| 2026-02-09 12:00 |
11:27:34.58 |
-37:12:15.0 |
HIP 55940 |
6.30 |
| 2026-02-10 00:00 |
11:27:21.69 |
-37:12:19.8 |
HIP 55940 |
8.04 |
| 2026-02-10 12:00 |
11:27:08.75 |
-37:12:23.6 |
HIP 55940 |
10.16 |
| 2026-02-11 00:00 |
11:26:55.75 |
-37:12:26.3 |
HIP 55940 |
12.47 |
| 2026-02-11 12:00 |
11:26:42.69 |
-37:12:27.9 |
HIP 55940 |
14.88 |
| 2026-02-12 00:00 |
11:26:29.58 |
-37:12:28.5 |
HIP 55940 |
17.37 |
| 2026-02-12 12:00 |
11:26:16.41 |
-37:12:28.1 |
HIP 55940 |
19.90 |
| 2026-02-13 00:00 |
11:26:03.19 |
-37:12:26.5 |
HIP 55940 |
22.47 |
| 2026-02-13 12:00 |
11:25:49.92 |
-37:12:24.0 |
HIP 55940 |
25.06 |
| 2026-02-14 00:00 |
11:25:36.60 |
-37:12:20.3 |
HIP 55794 |
25.25 |
| 2026-02-14 12:00 |
11:25:23.23 |
-37:12:15.6 |
HIP 55794 |
25.64 |
| 2026-02-15 00:00 |
11:25:09.81 |
-37:12:09.8 |
HIP 55794 |
26.28 |
| 2026-02-15 12:00 |
11:24:56.34 |
-37:12:02.9 |
HIP 55794 |
27.16 |
| 2026-02-16 00:00 |
11:24:42.83 |
-37:11:55.0 |
HIP 55794 |
28.26 |
| 2026-02-16 12:00 |
11:24:29.27 |
-37:11:46.0 |
HIP 55794 |
29.55 |
| 2026-02-17 00:00 |
11:24:15.67 |
-37:11:35.9 |
HIP 55794 |
31.02 |
| 2026-02-17 12:00 |
11:24:02.02 |
-37:11:24.7 |
HIP 55794 |
32.65 |
| 2026-02-18 00:00 |
11:23:48.33 |
-37:11:12.5 |
HIP 55794 |
34.41 |
| 2026-02-18 12:00 |
11:23:34.61 |
-37:10:59.2 |
HIP 55794 |
36.28 |
| 2026-02-19 00:00 |
11:23:20.84 |
-37:10:44.8 |
HIP 55794 |
38.26 |
| 2026-02-19 12:00 |
11:23:07.04 |
-37:10:29.3 |
HIP 55346 |
39.30 |
| 2026-02-20 00:00 |
11:22:53.20 |
-37:10:12.8 |
HIP 55346 |
36.86 |
| 2026-02-20 12:00 |
11:22:39.32 |
-37:09:55.2 |
HIP 55346 |
34.47 |
| 2026-02-21 00:00 |
11:22:25.42 |
-37:09:36.5 |
HIP 55346 |
32.15 |
| 2026-02-21 12:00 |
11:22:11.47 |
-37:09:16.7 |
HIP 55346 |
29.90 |
| 2026-02-22 00:00 |
11:21:57.50 |
-37:08:55.9 |
HIP 55346 |
27.76 |
| 2026-02-22 12:00 |
11:21:43.50 |
-37:08:34.0 |
HIP 55346 |
25.76 |
| 2026-02-23 00:00 |
11:21:29.47 |
-37:08:11.0 |
HIP 55346 |
23.92 |
| 2026-02-23 12:00 |
11:21:15.41 |
-37:07:46.9 |
HIP 55346 |
22.30 |
| 2026-02-24 00:00 |
11:21:01.33 |
-37:07:21.8 |
HIP 55346 |
20.95 |