C/2024 G3 (ATLAS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2024 G3 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-01-13T10:11:01.593600Z |
| Orbit solution date (soln_date, UTC) | 2025-04-11T14:44:56Z |
| Obs used | 299 |
| NEO | - |
| M1 | 7.600 |
| K1 | 12.500 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-04-05T06:19:43.334400Z |
| Discovery magnitude (MPC) | 19.21 o |
| Discovery observatory (MPC) | W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-06-19.0000000 |
| e | 1.00001229 |
| q (au) | 0.093493 |
| a (au) | -7606.453070 |
| i (deg) | 116.851095 |
| Ω (om, deg) | 220.332091 |
| ω (w, deg) | 108.125373 |
| M (ma, deg) | -0.000310 |
Magnitude
Scatter + Global Linear
$$ M_a = (8.414 + 4.556\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 8.414 |
| n | 4.556 |
| gf | 0.800 |
| gb | -0.506 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2024-04-05 | 2025-01-03 | +1.9192 | -0.824 |
| 2025-01-03 | 2025-01-11 | -4.0733 | -3.425 |
| 2025-01-11 | 2025-01-13 | -1.4868 | -1.082 |
| 2025-01-13 | 2025-05-20 | -2.4763 | -2.598 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 01:07:51.69 | -69:46:39.5 | HIP 5386 | 13.84 |
| 2026-05-12 12:00 | 01:08:28.76 | -69:49:12.7 | HIP 5386 | 15.41 |
| 2026-05-13 00:00 | 01:09:05.75 | -69:51:47.2 | HIP 5386 | 17.83 |
| 2026-05-13 12:00 | 01:09:42.66 | -69:54:23.2 | HIP 5386 | 20.81 |
| 2026-05-14 00:00 | 01:10:19.49 | -69:57:00.7 | HIP 5386 | 24.14 |
| 2026-05-14 12:00 | 01:10:56.24 | -69:59:39.5 | HIP 5565 | 21.29 |
| 2026-05-15 00:00 | 01:11:32.91 | -70:02:19.8 | HIP 5565 | 18.51 |
| 2026-05-15 12:00 | 01:12:09.49 | -70:05:01.6 | HIP 5565 | 16.28 |
| 2026-05-16 00:00 | 01:12:45.99 | -70:07:44.7 | HIP 5565 | 14.84 |
| 2026-05-16 12:00 | 01:13:22.41 | -70:10:29.2 | HIP 5565 | 14.44 |
| 2026-05-17 00:00 | 01:13:58.73 | -70:13:15.1 | HIP 5565 | 15.15 |
| 2026-05-17 12:00 | 01:14:34.97 | -70:16:02.5 | HIP 5565 | 16.86 |
| 2026-05-18 00:00 | 01:15:11.12 | -70:18:51.2 | HIP 5565 | 19.29 |
| 2026-05-18 12:00 | 01:15:47.18 | -70:21:41.3 | HIP 5565 | 22.21 |
| 2026-05-19 00:00 | 01:16:23.14 | -70:24:32.8 | HIP 5565 | 25.46 |
| 2026-05-19 12:00 | 01:16:59.01 | -70:27:25.7 | HIP 5565 | 28.93 |
| 2026-05-20 00:00 | 01:17:34.79 | -70:30:19.9 | HIP 5695 | 31.05 |
| 2026-05-20 12:00 | 01:18:10.47 | -70:33:15.5 | HIP 6552 | 30.88 |
| 2026-05-21 00:00 | 01:18:46.05 | -70:36:12.4 | HIP 6552 | 27.37 |
| 2026-05-21 12:00 | 01:19:21.53 | -70:39:10.7 | HIP 6552 | 24.10 |
| 2026-05-22 00:00 | 01:19:56.91 | -70:42:10.3 | HIP 6552 | 21.17 |
| 2026-05-22 12:00 | 01:20:32.19 | -70:45:11.2 | HIP 6552 | 18.75 |
| 2026-05-23 00:00 | 01:21:07.37 | -70:48:13.5 | HIP 6552 | 17.08 |
| 2026-05-23 12:00 | 01:21:42.44 | -70:51:17.0 | HIP 6552 | 16.37 |
| 2026-05-24 00:00 | 01:22:17.41 | -70:54:21.9 | HIP 6552 | 16.76 |
| 2026-05-24 12:00 | 01:22:52.28 | -70:57:28.0 | HIP 6552 | 18.17 |
| 2026-05-25 00:00 | 01:23:27.03 | -71:00:35.5 | HIP 6552 | 20.41 |
| 2026-05-25 12:00 | 01:24:01.68 | -71:03:44.2 | HIP 6824 | 22.11 |
| 2026-05-26 00:00 | 01:24:36.22 | -71:06:54.2 | HIP 6824 | 21.92 |
| 2026-05-26 12:00 | 01:25:10.65 | -71:10:05.5 | HIP 6824 | 22.58 |
| 2026-05-27 00:00 | 01:25:44.97 | -71:13:18.0 | HIP 6824 | 24.00 |
| 2026-05-27 12:00 | 01:26:19.17 | -71:16:31.8 | HIP 6824 | 26.08 |
| 2026-05-28 00:00 | 01:26:53.26 | -71:19:46.8 | HIP 6812 | 22.76 |
| 2026-05-28 12:00 | 01:27:27.23 | -71:23:03.1 | HIP 6812 | 19.23 |
| 2026-05-29 00:00 | 01:28:01.09 | -71:26:20.6 | HIP 6812 | 16.01 |
| 2026-05-29 12:00 | 01:28:34.82 | -71:29:39.3 | HIP 6812 | 13.35 |
| 2026-05-30 00:00 | 01:29:08.44 | -71:32:59.2 | HIP 6812 | 11.64 |
| 2026-05-30 12:00 | 01:29:41.94 | -71:36:20.4 | HIP 6812 | 11.34 |
| 2026-05-31 00:00 | 01:30:15.31 | -71:39:42.7 | HIP 6812 | 12.54 |
| 2026-05-31 12:00 | 01:30:48.56 | -71:43:06.3 | HIP 6812 | 14.90 |
| 2026-06-01 00:00 | 01:31:21.68 | -71:46:31.0 | HIP 6812 | 17.96 |
| 2026-06-01 12:00 | 01:31:54.68 | -71:49:56.9 | HIP 6812 | 21.43 |
| 2026-06-02 00:00 | 01:32:27.54 | -71:53:24.0 | HIP 6812 | 25.14 |