C/2022 L2 (ATLAS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2022 L2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-03-12T07:55:19.948800Z |
| Orbit solution date (soln_date, UTC) | 2026-04-05T22:49:47Z |
| Obs used | 2512 |
| NEO | - |
| M1 | 11.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-06-10T11:24:34.041600Z |
| Discovery magnitude (MPC) | 18.43 o |
| Discovery observatory (MPC) | T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-04-29.0000000 |
| e | 1.00133386 |
| q (au) | 2.692315 |
| a (au) | -2018.432959 |
| i (deg) | 129.313595 |
| Ω (om, deg) | 39.242589 |
| ω (w, deg) | 199.942117 |
| M (ma, deg) | -0.003460 |
Magnitude
Scatter + Global Linear
$$ M_a = (12.967 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 12.967 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.690 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) | End (UTC) | a | b |
|---|---|---|---|
| 2022-05-20 | 2023-05-24 | +2.1870 | -1.838 |
| 2023-05-24 | 2024-03-12 | -0.6286 | +0.108 |
| 2024-03-13 | 2026-02-06 | +2.0535 | -0.781 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 05:17:21.60 | -10:39:20.8 | HIP 24687 | 20.15 |
| 2026-06-01 12:00 | 05:17:31.75 | -10:38:21.2 | HIP 24773 | 18.84 |
| 2026-06-02 00:00 | 05:17:41.91 | -10:37:22.6 | HIP 24773 | 16.17 |
| 2026-06-02 12:00 | 05:17:52.08 | -10:36:24.9 | HIP 24773 | 13.50 |
| 2026-06-03 00:00 | 05:18:02.25 | -10:35:28.2 | HIP 24773 | 10.85 |
| 2026-06-03 12:00 | 05:18:12.43 | -10:34:32.4 | HIP 24773 | 8.21 |
| 2026-06-04 00:00 | 05:18:22.62 | -10:33:37.7 | HIP 24773 | 5.62 |
| 2026-06-04 12:00 | 05:18:32.81 | -10:32:43.8 | HIP 24773 | 3.16 |
| 2026-06-05 00:00 | 05:18:43.00 | -10:31:51.0 | HIP 24773 | 1.60 |
| 2026-06-05 12:00 | 05:18:53.20 | -10:30:59.1 | HIP 24773 | 3.04 |
| 2026-06-06 00:00 | 05:19:03.39 | -10:30:08.1 | HIP 24773 | 5.48 |
| 2026-06-06 12:00 | 05:19:13.59 | -10:29:18.1 | HIP 24773 | 8.05 |
| 2026-06-07 00:00 | 05:19:23.79 | -10:28:29.1 | HIP 24773 | 10.65 |
| 2026-06-07 12:00 | 05:19:33.99 | -10:27:41.1 | HIP 24773 | 13.26 |
| 2026-06-08 00:00 | 05:19:44.19 | -10:26:53.9 | HIP 24953 | 14.53 |
| 2026-06-08 12:00 | 05:19:54.39 | -10:26:07.8 | HIP 24953 | 12.51 |
| 2026-06-09 00:00 | 05:20:04.58 | -10:25:22.6 | HIP 24953 | 10.74 |
| 2026-06-09 12:00 | 05:20:14.77 | -10:24:38.4 | HIP 24953 | 9.37 |
| 2026-06-10 00:00 | 05:20:24.96 | -10:23:55.1 | HIP 24953 | 8.57 |
| 2026-06-10 12:00 | 05:20:35.15 | -10:23:12.7 | HIP 24991 | 7.63 |
| 2026-06-11 00:00 | 05:20:45.33 | -10:22:31.4 | HIP 24991 | 5.04 |
| 2026-06-11 12:00 | 05:20:55.50 | -10:21:51.0 | HIP 24991 | 2.46 |
| 2026-06-12 00:00 | 05:21:05.67 | -10:21:11.5 | HIP 24991 | 0.32 |
| 2026-06-12 12:00 | 05:21:15.82 | -10:20:33.0 | HIP 24991 | 2.74 |
| 2026-06-13 00:00 | 05:21:25.98 | -10:19:55.4 | HIP 24991 | 5.31 |
| 2026-06-13 12:00 | 05:21:36.12 | -10:19:18.8 | HIP 24991 | 7.88 |
| 2026-06-14 00:00 | 05:21:46.25 | -10:18:43.2 | HIP 24991 | 10.44 |
| 2026-06-14 12:00 | 05:21:56.37 | -10:18:08.5 | HIP 24991 | 12.99 |
| 2026-06-15 00:00 | 05:22:06.48 | -10:17:34.8 | HIP 25132 | 14.60 |
| 2026-06-15 12:00 | 05:22:16.58 | -10:17:02.0 | HIP 25132 | 13.63 |
| 2026-06-16 00:00 | 05:22:26.66 | -10:16:30.1 | HIP 25132 | 13.07 |
| 2026-06-16 12:00 | 05:22:36.74 | -10:15:59.2 | HIP 25132 | 12.98 |
| 2026-06-17 00:00 | 05:22:46.79 | -10:15:29.3 | HIP 25132 | 13.37 |
| 2026-06-17 12:00 | 05:22:56.83 | -10:15:00.3 | HIP 25210 | 13.76 |
| 2026-06-18 00:00 | 05:23:06.86 | -10:14:32.2 | HIP 25210 | 12.61 |
| 2026-06-18 12:00 | 05:23:16.87 | -10:14:05.1 | HIP 25210 | 11.88 |
| 2026-06-19 00:00 | 05:23:26.85 | -10:13:38.9 | HIP 25210 | 11.63 |
| 2026-06-19 12:00 | 05:23:36.83 | -10:13:13.7 | HIP 25210 | 11.90 |
| 2026-06-20 00:00 | 05:23:46.78 | -10:12:49.4 | HIP 25210 | 12.64 |
| 2026-06-20 12:00 | 05:23:56.71 | -10:12:26.0 | HIP 25242 | 12.97 |
| 2026-06-21 00:00 | 05:24:06.62 | -10:12:03.5 | HIP 25242 | 13.03 |
| 2026-06-21 12:00 | 05:24:16.51 | -10:11:42.0 | HIP 25242 | 13.56 |
| 2026-06-22 00:00 | 05:24:26.38 | -10:11:21.4 | HIP 25329 | 12.08 |