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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 00:05:35.07 | -67:39:06.5 | HIP 436 | 10.89 |
| 2026-03-26 12:00 | 00:06:16.78 | -67:39:16.5 | HIP 436 | 11.98 |
| 2026-03-27 00:00 | 00:06:58.46 | -67:39:28.0 | HIP 436 | 14.11 |
| 2026-03-27 12:00 | 00:07:40.10 | -67:39:41.0 | HIP 436 | 16.89 |
| 2026-03-28 00:00 | 00:08:21.71 | -67:39:55.5 | HIP 436 | 20.05 |
| 2026-03-28 12:00 | 00:09:03.29 | -67:40:11.6 | HIP 436 | 23.43 |
| 2026-03-29 00:00 | 00:09:44.83 | -67:40:29.2 | HIP 436 | 26.95 |
| 2026-03-29 12:00 | 00:10:26.34 | -67:40:48.3 | HIP 436 | 30.57 |
| 2026-03-30 00:00 | 00:11:07.81 | -67:41:08.9 | HIP 1278 | 30.61 |
| 2026-03-30 12:00 | 00:11:49.25 | -67:41:31.1 | HIP 1278 | 26.92 |
| 2026-03-31 00:00 | 00:12:30.65 | -67:41:54.8 | HIP 1278 | 23.32 |
| 2026-03-31 12:00 | 00:13:12.02 | -67:42:20.0 | HIP 1278 | 19.82 |
| 2026-04-01 00:00 | 00:13:53.35 | -67:42:46.7 | HIP 1278 | 16.51 |
| 2026-04-01 12:00 | 00:14:34.65 | -67:43:15.0 | HIP 1278 | 13.52 |
| 2026-04-02 00:00 | 00:15:15.92 | -67:43:44.8 | HIP 1278 | 11.10 |
| 2026-04-02 12:00 | 00:15:57.14 | -67:44:16.1 | HIP 1278 | 9.70 |
| 2026-04-03 00:00 | 00:16:38.34 | -67:44:49.0 | HIP 1278 | 9.77 |
| 2026-04-03 12:00 | 00:17:19.50 | -67:45:23.4 | HIP 1278 | 11.27 |
| 2026-04-04 00:00 | 00:18:00.62 | -67:45:59.3 | HIP 1536 | 12.95 |
| 2026-04-04 12:00 | 00:18:41.71 | -67:46:36.8 | HIP 1536 | 12.16 |
| 2026-04-05 00:00 | 00:19:22.76 | -67:47:15.8 | HIP 1536 | 12.64 |
| 2026-04-05 12:00 | 00:20:03.77 | -67:47:56.3 | HIP 1536 | 14.27 |
| 2026-04-06 00:00 | 00:20:44.75 | -67:48:38.4 | HIP 1764 | 14.26 |
| 2026-04-06 12:00 | 00:21:25.70 | -67:49:22.0 | HIP 1764 | 12.84 |
| 2026-04-07 00:00 | 00:22:06.61 | -67:50:07.2 | HIP 1876 | 11.56 |
| 2026-04-07 12:00 | 00:22:47.48 | -67:50:53.9 | HIP 1876 | 9.55 |
| 2026-04-08 00:00 | 00:23:28.31 | -67:51:42.2 | HIP 1876 | 8.96 |
| 2026-04-08 12:00 | 00:24:09.11 | -67:52:32.0 | HIP 1876 | 10.05 |
| 2026-04-09 00:00 | 00:24:49.86 | -67:53:23.3 | HIP 2013 | 9.57 |
| 2026-04-09 12:00 | 00:25:30.59 | -67:54:16.2 | HIP 2013 | 9.56 |
| 2026-04-10 00:00 | 00:26:11.27 | -67:55:10.7 | HIP 2013 | 11.09 |
| 2026-04-10 12:00 | 00:26:51.91 | -67:56:06.7 | HIP 2111 | 12.83 |
| 2026-04-11 00:00 | 00:27:32.52 | -67:57:04.3 | HIP 2111 | 14.39 |
| 2026-04-11 12:00 | 00:28:13.08 | -67:58:03.4 | HIP 2111 | 16.78 |
| 2026-04-12 00:00 | 00:28:53.61 | -67:59:04.0 | HIP 2111 | 19.69 |
| 2026-04-12 12:00 | 00:29:34.10 | -68:00:06.3 | HIP 2556 | 16.34 |
| 2026-04-13 00:00 | 00:30:14.54 | -68:01:10.1 | HIP 2556 | 12.56 |
| 2026-04-13 12:00 | 00:30:54.95 | -68:02:15.4 | HIP 2556 | 8.94 |
| 2026-04-14 00:00 | 00:31:35.31 | -68:03:22.3 | HIP 2556 | 5.77 |
| 2026-04-14 12:00 | 00:32:15.63 | -68:04:30.8 | HIP 2556 | 4.23 |
| 2026-04-15 00:00 | 00:32:55.91 | -68:05:40.9 | HIP 2592 | 4.01 |
| 2026-04-15 12:00 | 00:33:36.15 | -68:06:52.5 | HIP 2592 | 4.86 |
| 2026-04-16 00:00 | 00:34:16.34 | -68:08:05.6 | HIP 2592 | 7.87 |