P/2024 T2 (Rankin)
Metadata
| Parameter | Value |
|---|---|
| Designation | P/2024 T2 (Rankin) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2024-12-08T08:20:48.166080Z |
| Orbit solution date (soln_date, UTC) | 2025-05-08T09:42:27Z |
| Obs used | 437 |
| NEO | - |
| M1 | 16.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2024-10-04T10:26:09.830400Z |
| Discovery magnitude (MPC) | 21.17 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-01-16.0000000 |
| e | 0.68065051 |
| q (au) | 1.972296 |
| a (au) | 6.175980 |
| i (deg) | 12.928498 |
| Ω (om, deg) | 113.060603 |
| ω (w, deg) | 343.832427 |
| M (ma, deg) | 2.482102 |
Magnitude
Scatter + Global Linear
$$ M_a = (17.486 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 17.486 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.621 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2024-12-09 | 2025-05-02 | -16.3623 | +5.017 |
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 | 14:08:42.26 | +03:52:55.8 | HIP 69016 | 17.31 |
| 2026-05-12 12:00 | 14:08:26.11 | +03:53:24.1 | HIP 69016 | 13.72 |
| 2026-05-13 00:00 | 14:08:10.07 | +03:53:50.9 | HIP 69016 | 10.50 |
| 2026-05-13 12:00 | 14:07:54.15 | +03:54:16.1 | HIP 69016 | 8.09 |
| 2026-05-14 00:00 | 14:07:38.36 | +03:54:39.7 | HIP 69016 | 7.26 |
| 2026-05-14 12:00 | 14:07:22.69 | +03:55:01.9 | HIP 69016 | 8.45 |
| 2026-05-15 00:00 | 14:07:07.15 | +03:55:22.4 | HIP 69016 | 10.98 |
| 2026-05-15 12:00 | 14:06:51.74 | +03:55:41.5 | HIP 69016 | 14.13 |
| 2026-05-16 00:00 | 14:06:36.46 | +03:55:58.9 | HIP 69016 | 17.54 |
| 2026-05-16 12:00 | 14:06:21.31 | +03:56:14.8 | HIP 69016 | 21.07 |
| 2026-05-17 00:00 | 14:06:06.30 | +03:56:29.2 | HIP 69016 | 24.64 |
| 2026-05-17 12:00 | 14:05:51.43 | +03:56:42.0 | HIP 69016 | 28.23 |
| 2026-05-18 00:00 | 14:05:36.70 | +03:56:53.3 | HIP 68731 | 25.67 |
| 2026-05-18 12:00 | 14:05:22.11 | +03:57:03.0 | HIP 68731 | 22.59 |
| 2026-05-19 00:00 | 14:05:07.67 | +03:57:11.1 | HIP 68731 | 19.74 |
| 2026-05-19 12:00 | 14:04:53.37 | +03:57:17.7 | HIP 68731 | 17.23 |
| 2026-05-20 00:00 | 14:04:39.22 | +03:57:22.8 | HIP 68731 | 15.19 |
| 2026-05-20 12:00 | 14:04:25.22 | +03:57:26.3 | HIP 68731 | 13.79 |
| 2026-05-21 00:00 | 14:04:11.38 | +03:57:28.3 | HIP 68731 | 13.23 |
| 2026-05-21 12:00 | 14:03:57.68 | +03:57:28.8 | HIP 68731 | 13.56 |
| 2026-05-22 00:00 | 14:03:44.15 | +03:57:27.7 | HIP 68731 | 14.71 |
| 2026-05-22 12:00 | 14:03:30.76 | +03:57:25.1 | HIP 68680 | 15.91 |
| 2026-05-23 00:00 | 14:03:17.54 | +03:57:21.0 | HIP 68680 | 16.35 |
| 2026-05-23 12:00 | 14:03:04.48 | +03:57:15.4 | HIP 68680 | 17.42 |
| 2026-05-24 00:00 | 14:02:51.57 | +03:57:08.3 | HIP 68680 | 19.00 |
| 2026-05-24 12:00 | 14:02:38.83 | +03:56:59.7 | HIP 68506 | 20.79 |
| 2026-05-25 00:00 | 14:02:26.25 | +03:56:49.5 | HIP 68506 | 18.18 |
| 2026-05-25 12:00 | 14:02:13.84 | +03:56:37.9 | HIP 68506 | 15.82 |
| 2026-05-26 00:00 | 14:02:01.59 | +03:56:24.8 | HIP 68506 | 13.81 |
| 2026-05-26 12:00 | 14:01:49.51 | +03:56:10.3 | HIP 68506 | 12.28 |
| 2026-05-27 00:00 | 14:01:37.60 | +03:55:54.2 | HIP 68506 | 11.40 |
| 2026-05-27 12:00 | 14:01:25.86 | +03:55:36.7 | HIP 68506 | 11.29 |
| 2026-05-28 00:00 | 14:01:14.28 | +03:55:17.8 | HIP 68506 | 11.94 |
| 2026-05-28 12:00 | 14:01:02.88 | +03:54:57.4 | HIP 68506 | 13.21 |
| 2026-05-29 00:00 | 14:00:51.65 | +03:54:35.5 | HIP 68506 | 14.93 |
| 2026-05-29 12:00 | 14:00:40.59 | +03:54:12.2 | HIP 68506 | 16.94 |
| 2026-05-30 00:00 | 14:00:29.71 | +03:53:47.5 | HIP 68506 | 19.13 |
| 2026-05-30 12:00 | 14:00:19.00 | +03:53:21.3 | HIP 68506 | 21.42 |
| 2026-05-31 00:00 | 14:00:08.46 | +03:52:53.8 | HIP 68392 | 23.54 |
| 2026-05-31 12:00 | 13:59:58.10 | +03:52:24.8 | HIP 68392 | 24.02 |
| 2026-06-01 00:00 | 13:59:47.92 | +03:51:54.4 | HIP 68392 | 24.78 |
| 2026-06-01 12:00 | 13:59:37.92 | +03:51:22.7 | HIP 68392 | 25.79 |
| 2026-06-02 00:00 | 13:59:28.09 | +03:50:49.5 | HIP 68392 | 27.02 |