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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 13:59:18.45 | +03:50:15.0 | HIP 68392 | 28.42 |
| 2026-06-03 00:00 | 13:59:08.98 | +03:49:39.1 | HIP 68392 | 29.96 |
| 2026-06-03 12:00 | 13:58:59.69 | +03:49:01.8 | HIP 68386 | 31.10 |
| 2026-06-04 00:00 | 13:58:50.59 | +03:48:23.1 | HIP 68386 | 31.67 |
| 2026-06-04 12:00 | 13:58:41.66 | +03:47:43.2 | HIP 68386 | 32.36 |
| 2026-06-05 00:00 | 13:58:32.92 | +03:47:01.8 | HIP 68386 | 33.14 |
| 2026-06-05 12:00 | 13:58:24.36 | +03:46:19.2 | HIP 68119 | 32.61 |
| 2026-06-06 00:00 | 13:58:15.98 | +03:45:35.2 | HIP 68119 | 31.57 |
| 2026-06-06 12:00 | 13:58:07.79 | +03:44:49.8 | HIP 68119 | 30.71 |
| 2026-06-07 00:00 | 13:57:59.78 | +03:44:03.2 | HIP 68119 | 30.02 |
| 2026-06-07 12:00 | 13:57:51.96 | +03:43:15.3 | HIP 68119 | 29.52 |
| 2026-06-08 00:00 | 13:57:44.32 | +03:42:26.0 | HIP 68119 | 29.20 |
| 2026-06-08 12:00 | 13:57:36.87 | +03:41:35.5 | HIP 68119 | 29.07 |
| 2026-06-09 00:00 | 13:57:29.60 | +03:40:43.7 | HIP 68119 | 29.12 |
| 2026-06-09 12:00 | 13:57:22.52 | +03:39:50.6 | HIP 68119 | 29.34 |
| 2026-06-10 00:00 | 13:57:15.62 | +03:38:56.2 | HIP 68119 | 29.73 |
| 2026-06-10 12:00 | 13:57:08.91 | +03:38:00.6 | HIP 68119 | 30.26 |
| 2026-06-11 00:00 | 13:57:02.39 | +03:37:03.7 | HIP 68119 | 30.93 |
| 2026-06-11 12:00 | 13:56:56.06 | +03:36:05.6 | HIP 67978 | 31.70 |
| 2026-06-12 00:00 | 13:56:49.92 | +03:35:06.3 | HIP 67978 | 29.89 |
| 2026-06-12 12:00 | 13:56:43.96 | +03:34:05.7 | HIP 67978 | 28.10 |
| 2026-06-13 00:00 | 13:56:38.20 | +03:33:03.9 | HIP 67978 | 26.33 |
| 2026-06-13 12:00 | 13:56:32.62 | +03:32:00.9 | HIP 67978 | 24.59 |
| 2026-06-14 00:00 | 13:56:27.23 | +03:30:56.6 | HIP 67978 | 22.87 |
| 2026-06-14 12:00 | 13:56:22.03 | +03:29:51.2 | HIP 67978 | 21.18 |
| 2026-06-15 00:00 | 13:56:17.02 | +03:28:44.6 | HIP 67978 | 19.51 |
| 2026-06-15 12:00 | 13:56:12.21 | +03:27:36.8 | HIP 67978 | 17.86 |
| 2026-06-16 00:00 | 13:56:07.58 | +03:26:27.9 | HIP 67978 | 16.24 |
| 2026-06-16 12:00 | 13:56:03.14 | +03:25:17.8 | HIP 67978 | 14.65 |
| 2026-06-17 00:00 | 13:55:58.89 | +03:24:06.5 | HIP 67978 | 13.10 |
| 2026-06-17 12:00 | 13:55:54.83 | +03:22:54.2 | HIP 67978 | 11.58 |
| 2026-06-18 00:00 | 13:55:50.96 | +03:21:40.7 | HIP 67978 | 10.11 |
| 2026-06-18 12:00 | 13:55:47.28 | +03:20:26.0 | HIP 67978 | 8.71 |
| 2026-06-19 00:00 | 13:55:43.79 | +03:19:10.3 | HIP 67978 | 7.40 |
| 2026-06-19 12:00 | 13:55:40.49 | +03:17:53.5 | HIP 67978 | 6.23 |
| 2026-06-20 00:00 | 13:55:37.38 | +03:16:35.6 | HIP 67978 | 5.31 |
| 2026-06-20 12:00 | 13:55:34.45 | +03:15:16.6 | HIP 67978 | 4.74 |
| 2026-06-21 00:00 | 13:55:31.72 | +03:13:56.6 | HIP 67978 | 4.67 |
| 2026-06-21 12:00 | 13:55:29.17 | +03:12:35.5 | HIP 67978 | 5.10 |
| 2026-06-22 00:00 | 13:55:26.81 | +03:11:13.4 | HIP 67978 | 5.93 |