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 · University of Arizona 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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 14:00:32.89 | +00:52:58.8 | HIP 68505 | 14.90 |
| 2026-07-29 12:00 | 14:00:42.87 | +00:50:45.1 | HIP 68486 | 12.16 |
| 2026-07-30 00:00 | 14:00:52.99 | +00:48:31.0 | HIP 68486 | 8.82 |
| 2026-07-30 12:00 | 14:01:03.24 | +00:46:16.5 | HIP 68486 | 5.48 |
| 2026-07-31 00:00 | 14:01:13.62 | +00:44:01.7 | HIP 68486 | 2.35 |
| 2026-07-31 12:00 | 14:01:24.14 | +00:41:46.6 | HIP 68486 | 2.17 |
| 2026-08-01 00:00 | 14:01:34.78 | +00:39:31.1 | HIP 68486 | 5.31 |
| 2026-08-01 12:00 | 14:01:45.56 | +00:37:15.2 | HIP 68486 | 8.75 |
| 2026-08-02 00:00 | 14:01:56.47 | +00:34:59.1 | HIP 68539 | 9.70 |
| 2026-08-02 12:00 | 14:02:07.51 | +00:32:42.6 | HIP 68539 | 8.30 |
| 2026-08-03 00:00 | 14:02:18.68 | +00:30:25.8 | HIP 68539 | 8.35 |
| 2026-08-03 12:00 | 14:02:29.98 | +00:28:08.7 | HIP 68539 | 9.86 |
| 2026-08-04 00:00 | 14:02:41.40 | +00:25:51.3 | HIP 68539 | 12.32 |
| 2026-08-04 12:00 | 14:02:52.96 | +00:23:33.6 | HIP 68539 | 15.30 |
| 2026-08-05 00:00 | 14:03:04.63 | +00:21:15.5 | HIP 68539 | 18.57 |
| 2026-08-05 12:00 | 14:03:16.43 | +00:18:57.2 | HIP 68605 | 19.26 |
| 2026-08-06 00:00 | 14:03:28.36 | +00:16:38.7 | HIP 68605 | 19.31 |
| 2026-08-06 12:00 | 14:03:40.41 | +00:14:19.8 | HIP 68605 | 20.11 |
| 2026-08-07 00:00 | 14:03:52.59 | +00:12:00.7 | HIP 68605 | 21.58 |
| 2026-08-07 12:00 | 14:04:04.88 | +00:09:41.3 | HIP 68605 | 23.61 |
| 2026-08-08 00:00 | 14:04:17.30 | +00:07:21.6 | HIP 68605 | 26.09 |
| 2026-08-08 12:00 | 14:04:29.84 | +00:05:01.7 | HIP 68718 | 27.66 |
| 2026-08-09 00:00 | 14:04:42.50 | +00:02:41.6 | HIP 68718 | 26.44 |
| 2026-08-09 12:00 | 14:04:55.28 | +00:00:21.2 | HIP 68718 | 25.78 |
| 2026-08-10 00:00 | 14:05:08.18 | -00:01:59.4 | HIP 68718 | 25.73 |
| 2026-08-10 12:00 | 14:05:21.19 | -00:04:20.2 | HIP 68718 | 26.32 |
| 2026-08-11 00:00 | 14:05:34.33 | -00:06:41.3 | HIP 68718 | 27.51 |
| 2026-08-11 12:00 | 14:05:47.58 | -00:09:02.6 | HIP 69009 | 28.18 |
| 2026-08-12 00:00 | 14:06:00.95 | -00:11:24.0 | HIP 69009 | 24.74 |
| 2026-08-12 12:00 | 14:06:14.43 | -00:13:45.7 | HIP 69009 | 21.50 |
| 2026-08-13 00:00 | 14:06:28.02 | -00:16:07.6 | HIP 69009 | 18.58 |
| 2026-08-13 12:00 | 14:06:41.73 | -00:18:29.6 | HIP 69009 | 16.18 |
| 2026-08-14 00:00 | 14:06:55.55 | -00:20:51.8 | HIP 69009 | 14.58 |
| 2026-08-14 12:00 | 14:07:09.49 | -00:23:14.2 | HIP 69009 | 14.07 |
| 2026-08-15 00:00 | 14:07:23.53 | -00:25:36.8 | HIP 69009 | 14.79 |
| 2026-08-15 12:00 | 14:07:37.69 | -00:27:59.5 | HIP 69009 | 16.60 |
| 2026-08-16 00:00 | 14:07:51.95 | -00:30:22.4 | HIP 69009 | 19.21 |
| 2026-08-16 12:00 | 14:08:06.32 | -00:32:45.4 | HIP 69009 | 22.36 |
| 2026-08-17 00:00 | 14:08:20.80 | -00:35:08.5 | HIP 69190 | 23.58 |
| 2026-08-17 12:00 | 14:08:35.39 | -00:37:31.8 | HIP 69190 | 19.67 |
| 2026-08-18 00:00 | 14:08:50.08 | -00:39:55.2 | HIP 69190 | 15.96 |
| 2026-08-18 12:00 | 14:09:04.88 | -00:42:18.7 | HIP 69190 | 12.66 |
| 2026-08-19 00:00 | 14:09:19.77 | -00:44:42.3 | HIP 69190 | 10.20 |