C/2024 T5 (ATLAS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2024 T5 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-05-06T04:34:00.278400Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T09:42:19Z |
| Obs used | 1384 |
| NEO | - |
| M1 | 5.900 |
| 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) | 2025-09-23.0000000 |
| e | 1.00229078 |
| q (au) | 3.840922 |
| a (au) | -1676.689975 |
| i (deg) | 52.386788 |
| Ω (om, deg) | 100.680211 |
| ω (w, deg) | 352.446782 |
| M (ma, deg) | -0.008473 |
Magnitude
Scatter + Global Linear
$$ M_a = (-0.869 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | -0.869 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.998 |
| 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 | +10.8979 | -9.443 |
| 2025-05-23 | 2026-03-24 | -2.7579 | +2.097 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 03:50:55.46 | -18:48:49.1 | HIP 18029 | 7.02 |
| 2026-05-12 12:00 | 03:51:24.87 | -18:45:09.5 | HIP 18031 | 9.83 |
| 2026-05-13 00:00 | 03:51:54.32 | -18:41:31.0 | HIP 18031 | 16.32 |
| 2026-05-13 12:00 | 03:52:23.79 | -18:37:53.6 | HIP 18159 | 12.99 |
| 2026-05-14 00:00 | 03:52:53.29 | -18:34:17.3 | HIP 18159 | 6.78 |
| 2026-05-14 12:00 | 03:53:22.82 | -18:30:42.1 | HIP 18173 | 5.19 |
| 2026-05-15 00:00 | 03:53:52.38 | -18:27:08.1 | HIP 18173 | 9.42 |
| 2026-05-15 12:00 | 03:54:21.96 | -18:23:35.1 | HIP 18173 | 16.56 |
| 2026-05-16 00:00 | 03:54:51.57 | -18:20:03.2 | HIP 18269 | 16.63 |
| 2026-05-16 12:00 | 03:55:21.20 | -18:16:32.5 | HIP 18269 | 17.37 |
| 2026-05-17 00:00 | 03:55:50.86 | -18:13:02.9 | HIP 18269 | 21.25 |
| 2026-05-17 12:00 | 03:56:20.55 | -18:09:34.4 | HIP 18483 | 25.66 |
| 2026-05-18 00:00 | 03:56:50.25 | -18:06:07.1 | HIP 18475 | 21.85 |
| 2026-05-18 12:00 | 03:57:19.98 | -18:02:40.8 | HIP 18475 | 19.47 |
| 2026-05-19 00:00 | 03:57:49.73 | -17:59:15.7 | HIP 18475 | 20.14 |
| 2026-05-19 12:00 | 03:58:19.50 | -17:55:51.7 | HIP 18665 | 20.73 |
| 2026-05-20 00:00 | 03:58:49.29 | -17:52:28.9 | HIP 18665 | 13.80 |
| 2026-05-20 12:00 | 03:59:19.10 | -17:49:07.2 | HIP 18665 | 8.61 |
| 2026-05-21 00:00 | 03:59:48.92 | -17:45:46.6 | HIP 18665 | 8.98 |
| 2026-05-21 12:00 | 04:00:18.77 | -17:42:27.2 | HIP 18665 | 14.48 |
| 2026-05-22 00:00 | 04:00:48.63 | -17:39:08.9 | HIP 18755 | 17.53 |
| 2026-05-22 12:00 | 04:01:18.51 | -17:35:51.7 | HIP 18755 | 14.53 |
| 2026-05-23 00:00 | 04:01:48.40 | -17:32:35.7 | HIP 18755 | 15.44 |
| 2026-05-23 12:00 | 04:02:18.31 | -17:29:20.8 | HIP 18755 | 19.73 |
| 2026-05-24 00:00 | 04:02:48.23 | -17:26:07.0 | HIP 18755 | 25.76 |
| 2026-05-24 12:00 | 04:03:18.17 | -17:22:54.4 | HIP 18755 | 32.58 |
| 2026-05-25 00:00 | 04:03:48.12 | -17:19:42.9 | HIP 18755 | 39.77 |
| 2026-05-25 12:00 | 04:04:18.09 | -17:16:32.5 | HIP 18990 | 41.29 |
| 2026-05-26 00:00 | 04:04:48.06 | -17:13:23.3 | HIP 18990 | 39.22 |
| 2026-05-26 12:00 | 04:05:18.05 | -17:10:15.2 | HIP 18990 | 38.68 |
| 2026-05-27 00:00 | 04:05:48.05 | -17:07:08.3 | HIP 18990 | 39.73 |
| 2026-05-27 12:00 | 04:06:18.05 | -17:04:02.5 | HIP 18990 | 42.24 |
| 2026-05-28 00:00 | 04:06:48.07 | -17:00:57.8 | HIP 18990 | 45.97 |
| 2026-05-28 12:00 | 04:07:18.10 | -16:57:54.3 | HIP 19383 | 42.89 |
| 2026-05-29 00:00 | 04:07:48.14 | -16:54:51.9 | HIP 19383 | 36.29 |
| 2026-05-29 12:00 | 04:08:18.18 | -16:51:50.7 | HIP 19383 | 30.28 |
| 2026-05-30 00:00 | 04:08:48.23 | -16:48:50.6 | HIP 19383 | 25.29 |
| 2026-05-30 12:00 | 04:09:18.29 | -16:45:51.6 | HIP 19383 | 22.01 |
| 2026-05-31 00:00 | 04:09:48.36 | -16:42:53.8 | HIP 19398 | 21.06 |
| 2026-05-31 12:00 | 04:10:18.43 | -16:39:57.1 | HIP 19398 | 22.21 |
| 2026-06-01 00:00 | 04:10:48.51 | -16:37:01.6 | HIP 19398 | 25.79 |
| 2026-06-01 12:00 | 04:11:18.59 | -16:34:07.2 | HIP 19398 | 30.96 |
| 2026-06-02 00:00 | 04:11:48.68 | -16:31:14.0 | HIP 19562 | 33.59 |