C/2024 T5 (ATLAS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2024 T5 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-05-06T04:09:28.756800Z |
| Orbit solution date (soln_date, UTC) | 2026-01-13T08:12:19Z |
| Obs used | 1089 |
| NEO | - |
| M1 | 6.000 |
| K1 | 7.750 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-10-02T22:18:01.411200Z |
| Discovery magnitude (MPC) | 19.20 o |
| Discovery observatory (MPC) | M22 · ATLAS South Africa, Sutherland |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-08-16.0000000 |
| e | 1.00231009 |
| q (au) | 3.841197 |
| a (au) | -1662.789405 |
| i (deg) | 52.386786 |
| Ω (om, deg) | 100.679991 |
| ω (w, deg) | 352.441330 |
| M (ma, deg) | -0.009131 |
Magnitude
Scatter + Global Linear
$$ M_a = (-0.838 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | -0.838 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.520 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2024-10-02 | 2025-05-23 | +10.6669 | -9.263 |
| 2025-05-23 | 2026-02-06 | -2.4736 | +1.843 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 02:39:05.30 | -35:12:26.3 | HIP 12409 | 13.89 |
| 2026-02-03 12:00 | 02:39:14.82 | -35:06:46.9 | HIP 12409 | 8.46 |
| 2026-02-04 00:00 | 02:39:24.51 | -35:01:07.2 | HIP 12409 | 4.60 |
| 2026-02-04 12:00 | 02:39:34.39 | -34:55:27.2 | HIP 12409 | 6.53 |
| 2026-02-05 00:00 | 02:39:44.45 | -34:49:47.1 | HIP 12409 | 11.69 |
| 2026-02-05 12:00 | 02:39:54.70 | -34:44:06.7 | HIP 12393 | 14.08 |
| 2026-02-06 00:00 | 02:40:05.13 | -34:38:26.0 | HIP 12393 | 9.95 |
| 2026-02-06 12:00 | 02:40:15.74 | -34:32:45.2 | HIP 12393 | 8.61 |
| 2026-02-07 00:00 | 02:40:26.53 | -34:27:04.2 | HIP 12393 | 11.15 |
| 2026-02-07 12:00 | 02:40:37.49 | -34:21:23.0 | HIP 12393 | 15.81 |
| 2026-02-08 00:00 | 02:40:48.64 | -34:15:41.7 | HIP 12581 | 12.50 |
| 2026-02-08 12:00 | 02:40:59.97 | -34:10:00.2 | HIP 12581 | 9.91 |
| 2026-02-09 00:00 | 02:41:11.47 | -34:04:18.5 | HIP 12581 | 10.73 |
| 2026-02-09 12:00 | 02:41:23.14 | -33:58:36.8 | HIP 12581 | 14.42 |
| 2026-02-10 00:00 | 02:41:35.00 | -33:52:54.9 | HIP 12581 | 19.42 |
| 2026-02-10 12:00 | 02:41:47.03 | -33:47:13.0 | HIP 12581 | 24.97 |
| 2026-02-11 00:00 | 02:41:59.23 | -33:41:30.9 | HIP 12714 | 29.75 |
| 2026-02-11 12:00 | 02:42:11.60 | -33:35:48.8 | HIP 12563 | 30.61 |
| 2026-02-12 00:00 | 02:42:24.15 | -33:30:06.7 | HIP 12563 | 26.07 |
| 2026-02-12 12:00 | 02:42:36.86 | -33:24:24.5 | HIP 12563 | 22.41 |
| 2026-02-13 00:00 | 02:42:49.75 | -33:18:42.2 | HIP 12762 | 16.99 |
| 2026-02-13 12:00 | 02:43:02.80 | -33:13:00.0 | HIP 12762 | 12.34 |
| 2026-02-14 00:00 | 02:43:16.03 | -33:07:17.8 | HIP 12732 | 6.74 |
| 2026-02-14 12:00 | 02:43:29.42 | -33:01:35.5 | HIP 12732 | 2.44 |
| 2026-02-15 00:00 | 02:43:42.98 | -32:55:53.3 | HIP 12732 | 6.88 |
| 2026-02-15 12:00 | 02:43:56.70 | -32:50:11.2 | HIP 12732 | 13.04 |
| 2026-02-16 00:00 | 02:44:10.59 | -32:44:29.1 | HIP 12786 | 13.17 |
| 2026-02-16 12:00 | 02:44:24.64 | -32:38:47.0 | HIP 12786 | 7.36 |
| 2026-02-17 00:00 | 02:44:38.86 | -32:33:05.0 | HIP 12786 | 4.18 |
| 2026-02-17 12:00 | 02:44:53.24 | -32:27:23.2 | HIP 12786 | 8.02 |
| 2026-02-18 00:00 | 02:45:07.77 | -32:21:41.4 | HIP 12786 | 13.97 |
| 2026-02-18 12:00 | 02:45:22.47 | -32:15:59.8 | HIP 12786 | 20.27 |
| 2026-02-19 00:00 | 02:45:37.33 | -32:10:18.2 | HIP 12954 | 24.87 |
| 2026-02-19 12:00 | 02:45:52.34 | -32:04:36.9 | HIP 13019 | 28.23 |
| 2026-02-20 00:00 | 02:46:07.52 | -31:58:55.6 | HIP 13073 | 30.16 |
| 2026-02-20 12:00 | 02:46:22.84 | -31:53:14.6 | HIP 13073 | 31.70 |
| 2026-02-21 00:00 | 02:46:38.33 | -31:47:33.7 | HIP 13082 | 29.41 |
| 2026-02-21 12:00 | 02:46:53.96 | -31:41:53.1 | HIP 13082 | 22.98 |
| 2026-02-22 00:00 | 02:47:09.75 | -31:36:12.6 | HIP 13082 | 16.64 |
| 2026-02-22 12:00 | 02:47:25.69 | -31:30:32.4 | HIP 13082 | 10.58 |
| 2026-02-23 00:00 | 02:47:41.79 | -31:24:52.4 | HIP 13082 | 5.82 |
| 2026-02-23 12:00 | 02:47:58.03 | -31:19:12.6 | HIP 13082 | 6.60 |
| 2026-02-24 00:00 | 02:48:14.41 | -31:13:33.1 | HIP 13082 | 11.88 |