C/2024 R4 (PANSTARRS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2024 R4 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-10-26T15:43:44.711040Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T09:42:19Z |
| Obs used | 972 |
| NEO | - |
| M1 | 6.300 |
| K1 | 7.750 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-09-11T08:54:09.475200Z |
| Discovery magnitude (MPC) | 21.20 w |
| Discovery observatory (MPC) | F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-08-26.0000000 |
| e | 1.00259676 |
| q (au) | 4.409008 |
| a (au) | -1697.890641 |
| i (deg) | 95.366167 |
| Ω (om, deg) | 345.936841 |
| ω (w, deg) | 108.995176 |
| M (ma, deg) | -0.011153 |
Magnitude
Scatter + Global Linear
$$ M_a = (-1.010 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | -1.010 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.500 |
| 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 |
|---|---|---|---|
| 2024-07-03 | 2025-04-28 | +24.1324 | -21.937 |
| 2025-04-28 | 2025-10-29 | +4.0661 | -3.548 |
| 2025-10-29 | 2026-03-21 | -8.9446 | +7.477 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 22:05:10.52 | +27:44:54.5 | HIP 109090 | 16.28 |
| 2026-03-26 12:00 | 22:05:21.12 | +27:48:58.4 | HIP 109090 | 11.63 |
| 2026-03-27 00:00 | 22:05:31.65 | +27:53:03.3 | HIP 109090 | 7.03 |
| 2026-03-27 12:00 | 22:05:42.13 | +27:57:09.3 | HIP 109090 | 2.78 |
| 2026-03-28 00:00 | 22:05:52.54 | +28:01:16.4 | HIP 109090 | 3.24 |
| 2026-03-28 12:00 | 22:06:02.88 | +28:05:24.5 | HIP 109090 | 7.61 |
| 2026-03-29 00:00 | 22:06:13.16 | +28:09:33.7 | HIP 109164 | 11.70 |
| 2026-03-29 12:00 | 22:06:23.38 | +28:13:43.9 | HIP 109164 | 7.02 |
| 2026-03-30 00:00 | 22:06:33.52 | +28:17:55.2 | HIP 109164 | 2.58 |
| 2026-03-30 12:00 | 22:06:43.60 | +28:22:07.5 | HIP 109164 | 3.04 |
| 2026-03-31 00:00 | 22:06:53.61 | +28:26:20.9 | HIP 109164 | 7.57 |
| 2026-03-31 12:00 | 22:07:03.55 | +28:30:35.4 | HIP 109164 | 12.28 |
| 2026-04-01 00:00 | 22:07:13.42 | +28:34:50.9 | HIP 109164 | 17.04 |
| 2026-04-01 12:00 | 22:07:23.22 | +28:39:07.4 | HIP 109164 | 21.81 |
| 2026-04-02 00:00 | 22:07:32.94 | +28:43:25.0 | HIP 109164 | 26.60 |
| 2026-04-02 12:00 | 22:07:42.59 | +28:47:43.6 | HIP 109056 | 29.78 |
| 2026-04-03 00:00 | 22:07:52.17 | +28:52:03.3 | HIP 109056 | 30.64 |
| 2026-04-03 12:00 | 22:08:01.67 | +28:56:24.0 | HIP 109056 | 32.19 |
| 2026-04-04 00:00 | 22:08:11.09 | +29:00:45.7 | HIP 109402 | 29.87 |
| 2026-04-04 12:00 | 22:08:20.44 | +29:05:08.5 | HIP 109402 | 25.46 |
| 2026-04-05 00:00 | 22:08:29.71 | +29:09:32.2 | HIP 109402 | 21.23 |
| 2026-04-05 12:00 | 22:08:38.89 | +29:13:57.0 | HIP 109402 | 17.34 |
| 2026-04-06 00:00 | 22:08:48.00 | +29:18:22.8 | HIP 109402 | 14.07 |
| 2026-04-06 12:00 | 22:08:57.03 | +29:22:49.7 | HIP 109402 | 11.96 |
| 2026-04-07 00:00 | 22:09:05.97 | +29:27:17.5 | HIP 109402 | 11.66 |
| 2026-04-07 12:00 | 22:09:14.82 | +29:31:46.4 | HIP 109402 | 13.31 |
| 2026-04-08 00:00 | 22:09:23.60 | +29:36:16.3 | HIP 109402 | 16.33 |
| 2026-04-08 12:00 | 22:09:32.28 | +29:40:47.1 | HIP 109257 | 19.03 |
| 2026-04-09 00:00 | 22:09:40.88 | +29:45:19.0 | HIP 109257 | 21.32 |
| 2026-04-09 12:00 | 22:09:49.39 | +29:49:51.9 | HIP 109257 | 24.38 |
| 2026-04-10 00:00 | 22:09:57.81 | +29:54:25.8 | HIP 109257 | 27.96 |
| 2026-04-10 12:00 | 22:10:06.14 | +29:59:00.6 | HIP 109257 | 31.89 |
| 2026-04-11 00:00 | 22:10:14.38 | +30:03:36.5 | HIP 109370 | 30.45 |
| 2026-04-11 12:00 | 22:10:22.53 | +30:08:13.3 | HIP 109493 | 25.74 |
| 2026-04-12 00:00 | 22:10:30.58 | +30:12:51.2 | HIP 109493 | 20.83 |
| 2026-04-12 12:00 | 22:10:38.53 | +30:17:29.9 | HIP 109493 | 15.94 |
| 2026-04-13 00:00 | 22:10:46.39 | +30:22:09.7 | HIP 109493 | 11.08 |
| 2026-04-13 12:00 | 22:10:54.16 | +30:26:50.4 | HIP 109493 | 6.36 |
| 2026-04-14 00:00 | 22:11:01.82 | +30:31:32.1 | HIP 109493 | 2.73 |
| 2026-04-14 12:00 | 22:11:09.38 | +30:36:14.8 | HIP 109493 | 4.89 |
| 2026-04-15 00:00 | 22:11:16.84 | +30:40:58.4 | HIP 109493 | 9.48 |
| 2026-04-15 12:00 | 22:11:24.20 | +30:45:43.0 | HIP 109454 | 12.23 |
| 2026-04-16 00:00 | 22:11:31.45 | +30:50:28.5 | HIP 109454 | 13.55 |