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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 01:33:00.28 | -71:56:52.2 | HIP 6812 | 29.00 |
| 2026-06-03 00:00 | 01:33:32.88 | -72:00:21.7 | HIP 6812 | 32.97 |
| 2026-06-03 12:00 | 01:34:05.34 | -72:03:52.2 | HIP 6812 | 37.00 |
| 2026-06-04 00:00 | 01:34:37.67 | -72:07:23.9 | HIP 7434 | 37.31 |
| 2026-06-04 12:00 | 01:35:09.87 | -72:10:56.8 | HIP 7434 | 33.52 |
| 2026-06-05 00:00 | 01:35:41.92 | -72:14:30.8 | HIP 7434 | 29.86 |
| 2026-06-05 12:00 | 01:36:13.83 | -72:18:05.9 | HIP 7434 | 26.36 |
| 2026-06-06 00:00 | 01:36:45.60 | -72:21:42.1 | HIP 7434 | 23.12 |
| 2026-06-06 12:00 | 01:37:17.21 | -72:25:19.5 | HIP 7434 | 20.26 |
| 2026-06-07 00:00 | 01:37:48.69 | -72:28:57.9 | HIP 7434 | 17.97 |
| 2026-06-07 12:00 | 01:38:20.01 | -72:32:37.4 | HIP 7434 | 16.48 |
| 2026-06-08 00:00 | 01:38:51.17 | -72:36:18.0 | HIP 7434 | 16.04 |
| 2026-06-08 12:00 | 01:39:22.18 | -72:39:59.7 | HIP 7434 | 16.73 |
| 2026-06-09 00:00 | 01:39:53.04 | -72:43:42.5 | HIP 7434 | 18.42 |
| 2026-06-09 12:00 | 01:40:23.73 | -72:47:26.3 | HIP 7434 | 20.88 |
| 2026-06-10 00:00 | 01:40:54.26 | -72:51:11.2 | HIP 7434 | 23.87 |
| 2026-06-10 12:00 | 01:41:24.62 | -72:54:57.1 | HIP 7434 | 27.22 |
| 2026-06-11 00:00 | 01:41:54.82 | -72:58:44.0 | HIP 7434 | 30.81 |
| 2026-06-11 12:00 | 01:42:24.84 | -73:02:32.0 | HIP 7434 | 34.57 |
| 2026-06-12 00:00 | 01:42:54.69 | -73:06:21.0 | HIP 7648 | 38.19 |
| 2026-06-12 12:00 | 01:43:24.37 | -73:10:10.9 | HIP 7648 | 36.08 |
| 2026-06-13 00:00 | 01:43:53.86 | -73:14:01.9 | HIP 7648 | 34.37 |
| 2026-06-13 12:00 | 01:44:23.17 | -73:17:53.9 | HIP 7648 | 33.12 |
| 2026-06-14 00:00 | 01:44:52.29 | -73:21:46.8 | HIP 7912 | 31.82 |
| 2026-06-14 12:00 | 01:45:21.23 | -73:25:40.7 | HIP 7912 | 29.34 |
| 2026-06-15 00:00 | 01:45:49.97 | -73:29:35.6 | HIP 8559 | 25.49 |
| 2026-06-15 12:00 | 01:46:18.51 | -73:33:31.4 | HIP 8559 | 21.44 |
| 2026-06-16 00:00 | 01:46:46.86 | -73:37:28.1 | HIP 8559 | 17.59 |
| 2026-06-16 12:00 | 01:47:15.00 | -73:41:25.7 | HIP 8559 | 14.09 |
| 2026-06-17 00:00 | 01:47:42.94 | -73:45:24.3 | HIP 8559 | 11.30 |
| 2026-06-17 12:00 | 01:48:10.67 | -73:49:23.7 | HIP 8559 | 9.84 |
| 2026-06-18 00:00 | 01:48:38.19 | -73:53:24.0 | HIP 8470 | 7.60 |
| 2026-06-18 12:00 | 01:49:05.49 | -73:57:25.1 | HIP 8470 | 3.24 |
| 2026-06-19 00:00 | 01:49:32.58 | -74:01:27.1 | HIP 8470 | 1.61 |
| 2026-06-19 12:00 | 01:49:59.44 | -74:05:30.0 | HIP 8470 | 5.85 |
| 2026-06-20 00:00 | 01:50:26.08 | -74:09:33.6 | HIP 8470 | 10.26 |
| 2026-06-20 12:00 | 01:50:52.49 | -74:13:38.1 | HIP 8470 | 14.70 |
| 2026-06-21 00:00 | 01:51:18.67 | -74:17:43.4 | HIP 8470 | 19.15 |
| 2026-06-21 12:00 | 01:51:44.61 | -74:21:49.4 | HIP 8811 | 16.89 |
| 2026-06-22 00:00 | 01:52:10.31 | -74:25:56.3 | HIP 8811 | 12.43 |