C/2022 L2 (ATLAS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2022 L2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-03-12T07:33:05.163840Z |
| Orbit solution date (soln_date, UTC) | 2026-03-07T14:42:53Z |
| Obs used | 3097 |
| 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) | 2023-07-18.0000000 |
| e | 1.00138912 |
| q (au) | 2.692471 |
| a (au) | -1938.259532 |
| i (deg) | 129.314146 |
| Ω (om, deg) | 39.241850 |
| ω (w, deg) | 199.935854 |
| M (ma, deg) | -0.002753 |
Magnitude
Scatter + Global Linear
$$ M_a = (12.983 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 12.983 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.692 |
| 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 | +2.2035 | -1.845 |
| 2023-05-24 | 2024-03-12 | -0.5853 | +0.086 |
| 2024-03-13 | 2025-12-27 | +1.7609 | -0.637 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 05:01:22.95 | -15:17:12.4 | HIP 23458 | 30.19 |
| 2026-03-26 12:00 | 05:01:24.50 | -15:14:08.5 | HIP 23458 | 32.61 |
| 2026-03-27 00:00 | 05:01:26.18 | -15:11:05.4 | HIP 23203 | 34.92 |
| 2026-03-27 12:00 | 05:01:27.98 | -15:08:03.1 | HIP 23203 | 33.38 |
| 2026-03-28 00:00 | 05:01:29.91 | -15:05:01.5 | HIP 23203 | 32.09 |
| 2026-03-28 12:00 | 05:01:31.96 | -15:02:00.8 | HIP 23203 | 31.08 |
| 2026-03-29 00:00 | 05:01:34.14 | -14:59:00.7 | HIP 23203 | 30.38 |
| 2026-03-29 12:00 | 05:01:36.43 | -14:56:01.5 | HIP 23203 | 30.01 |
| 2026-03-30 00:00 | 05:01:38.85 | -14:53:03.1 | HIP 23203 | 29.97 |
| 2026-03-30 12:00 | 05:01:41.38 | -14:50:05.4 | HIP 23203 | 30.27 |
| 2026-03-31 00:00 | 05:01:44.03 | -14:47:08.5 | HIP 23203 | 30.89 |
| 2026-03-31 12:00 | 05:01:46.80 | -14:44:12.5 | HIP 23203 | 31.81 |
| 2026-04-01 00:00 | 05:01:49.68 | -14:41:17.2 | HIP 23560 | 31.70 |
| 2026-04-01 12:00 | 05:01:52.68 | -14:38:22.7 | HIP 23560 | 30.39 |
| 2026-04-02 00:00 | 05:01:55.79 | -14:35:29.1 | HIP 23560 | 29.30 |
| 2026-04-02 12:00 | 05:01:59.02 | -14:32:36.2 | HIP 23560 | 28.45 |
| 2026-04-03 00:00 | 05:02:02.36 | -14:29:44.2 | HIP 23551 | 27.62 |
| 2026-04-03 12:00 | 05:02:05.80 | -14:26:53.0 | HIP 23551 | 26.16 |
| 2026-04-04 00:00 | 05:02:09.36 | -14:24:02.6 | HIP 23551 | 24.95 |
| 2026-04-04 12:00 | 05:02:13.03 | -14:21:13.1 | HIP 23551 | 24.02 |
| 2026-04-05 00:00 | 05:02:16.81 | -14:18:24.4 | HIP 23551 | 23.40 |
| 2026-04-05 12:00 | 05:02:20.69 | -14:15:36.5 | HIP 23551 | 23.11 |
| 2026-04-06 00:00 | 05:02:24.68 | -14:12:49.4 | HIP 23551 | 23.17 |
| 2026-04-06 12:00 | 05:02:28.77 | -14:10:03.2 | HIP 23551 | 23.57 |
| 2026-04-07 00:00 | 05:02:32.97 | -14:07:17.9 | HIP 23551 | 24.30 |
| 2026-04-07 12:00 | 05:02:37.28 | -14:04:33.4 | HIP 23551 | 25.31 |
| 2026-04-08 00:00 | 05:02:41.68 | -14:01:49.8 | HIP 23551 | 26.59 |
| 2026-04-08 12:00 | 05:02:46.19 | -13:59:07.0 | HIP 23551 | 28.09 |
| 2026-04-09 00:00 | 05:02:50.80 | -13:56:25.1 | HIP 23590 | 26.14 |
| 2026-04-09 12:00 | 05:02:55.51 | -13:53:44.0 | HIP 23590 | 23.80 |
| 2026-04-10 00:00 | 05:03:00.31 | -13:51:03.8 | HIP 23590 | 21.58 |
| 2026-04-10 12:00 | 05:03:05.22 | -13:48:24.5 | HIP 23590 | 19.53 |
| 2026-04-11 00:00 | 05:03:10.22 | -13:45:46.1 | HIP 23590 | 17.69 |
| 2026-04-11 12:00 | 05:03:15.32 | -13:43:08.5 | HIP 23590 | 16.16 |
| 2026-04-12 00:00 | 05:03:20.51 | -13:40:31.9 | HIP 23590 | 15.00 |
| 2026-04-12 12:00 | 05:03:25.80 | -13:37:56.1 | HIP 23590 | 14.32 |
| 2026-04-13 00:00 | 05:03:31.18 | -13:35:21.2 | HIP 23590 | 14.19 |
| 2026-04-13 12:00 | 05:03:36.65 | -13:32:47.2 | HIP 23590 | 14.60 |
| 2026-04-14 00:00 | 05:03:42.22 | -13:30:14.1 | HIP 23590 | 15.53 |
| 2026-04-14 12:00 | 05:03:47.87 | -13:27:41.9 | HIP 23590 | 16.88 |
| 2026-04-15 00:00 | 05:03:53.62 | -13:25:10.6 | HIP 23590 | 18.57 |
| 2026-04-15 12:00 | 05:03:59.45 | -13:22:40.2 | HIP 23590 | 20.50 |
| 2026-04-16 00:00 | 05:04:05.37 | -13:20:10.8 | HIP 23590 | 22.61 |