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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 05:34:47.94 | -10:26:33.9 | HIP 26148 | 5.87 |
| 2026-07-29 12:00 | 05:34:54.22 | -10:27:17.0 | HIP 26148 | 6.85 |
| 2026-07-30 00:00 | 05:35:00.42 | -10:28:00.8 | HIP 26148 | 8.05 |
| 2026-07-30 12:00 | 05:35:06.55 | -10:28:45.3 | HIP 26148 | 9.38 |
| 2026-07-31 00:00 | 05:35:12.61 | -10:29:30.6 | HIP 26148 | 10.79 |
| 2026-07-31 12:00 | 05:35:18.59 | -10:30:16.6 | HIP 26148 | 12.25 |
| 2026-08-01 00:00 | 05:35:24.49 | -10:31:03.4 | HIP 26148 | 13.74 |
| 2026-08-01 12:00 | 05:35:30.32 | -10:31:50.9 | HIP 26148 | 15.24 |
| 2026-08-02 00:00 | 05:35:36.07 | -10:32:39.1 | HIP 26349 | 15.50 |
| 2026-08-02 12:00 | 05:35:41.75 | -10:33:28.0 | HIP 26349 | 14.31 |
| 2026-08-03 00:00 | 05:35:47.34 | -10:34:17.7 | HIP 26349 | 13.23 |
| 2026-08-03 12:00 | 05:35:52.86 | -10:35:08.1 | HIP 26349 | 12.28 |
| 2026-08-04 00:00 | 05:35:58.30 | -10:35:59.2 | HIP 26349 | 11.51 |
| 2026-08-04 12:00 | 05:36:03.66 | -10:36:50.9 | HIP 26349 | 10.94 |
| 2026-08-05 00:00 | 05:36:08.93 | -10:37:43.5 | HIP 26349 | 10.59 |
| 2026-08-05 12:00 | 05:36:14.13 | -10:38:36.7 | HIP 26349 | 10.49 |
| 2026-08-06 00:00 | 05:36:19.24 | -10:39:30.6 | HIP 26349 | 10.64 |
| 2026-08-06 12:00 | 05:36:24.27 | -10:40:25.2 | HIP 26349 | 11.02 |
| 2026-08-07 00:00 | 05:36:29.22 | -10:41:20.5 | HIP 26349 | 11.61 |
| 2026-08-07 12:00 | 05:36:34.08 | -10:42:16.4 | HIP 26349 | 12.38 |
| 2026-08-08 00:00 | 05:36:38.85 | -10:43:13.1 | HIP 26349 | 13.28 |
| 2026-08-08 12:00 | 05:36:43.55 | -10:44:10.5 | HIP 26349 | 14.30 |
| 2026-08-09 00:00 | 05:36:48.15 | -10:45:08.5 | HIP 26349 | 15.40 |
| 2026-08-09 12:00 | 05:36:52.67 | -10:46:07.2 | HIP 26349 | 16.57 |
| 2026-08-10 00:00 | 05:36:57.10 | -10:47:06.6 | HIP 26349 | 17.79 |
| 2026-08-10 12:00 | 05:37:01.44 | -10:48:06.6 | HIP 26349 | 19.05 |
| 2026-08-11 00:00 | 05:37:05.69 | -10:49:07.3 | HIP 26349 | 20.34 |
| 2026-08-11 12:00 | 05:37:09.85 | -10:50:08.6 | HIP 26349 | 21.65 |
| 2026-08-12 00:00 | 05:37:13.92 | -10:51:10.6 | HIP 26349 | 22.98 |
| 2026-08-12 12:00 | 05:37:17.89 | -10:52:13.3 | HIP 26349 | 24.33 |
| 2026-08-13 00:00 | 05:37:21.78 | -10:53:16.6 | HIP 26349 | 25.68 |
| 2026-08-13 12:00 | 05:37:25.57 | -10:54:20.5 | HIP 26582 | 25.15 |
| 2026-08-14 00:00 | 05:37:29.27 | -10:55:25.0 | HIP 26582 | 23.98 |
| 2026-08-14 12:00 | 05:37:32.88 | -10:56:30.2 | HIP 26582 | 22.84 |
| 2026-08-15 00:00 | 05:37:36.39 | -10:57:36.0 | HIP 26582 | 21.76 |
| 2026-08-15 12:00 | 05:37:39.80 | -10:58:42.4 | HIP 26582 | 20.74 |
| 2026-08-16 00:00 | 05:37:43.12 | -10:59:49.4 | HIP 26582 | 19.79 |
| 2026-08-16 12:00 | 05:37:46.34 | -11:00:57.0 | HIP 26582 | 18.91 |
| 2026-08-17 00:00 | 05:37:49.47 | -11:02:05.2 | HIP 26582 | 18.12 |
| 2026-08-17 12:00 | 05:37:52.49 | -11:03:13.9 | HIP 26582 | 17.43 |
| 2026-08-18 00:00 | 05:37:55.42 | -11:04:23.3 | HIP 26582 | 16.84 |
| 2026-08-18 12:00 | 05:37:58.25 | -11:05:33.3 | HIP 26582 | 16.38 |
| 2026-08-19 00:00 | 05:38:00.98 | -11:06:43.8 | HIP 26582 | 16.04 |