C/2024 E1 (Wierzchos)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2024 E1 (Wierzchos) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-01-20T18:18:57.464640Z |
| Orbit solution date (soln_date, UTC) | 2026-07-07T05:52:15Z |
| Obs used | 2233 |
| NEO | - |
| M1 | 11.700 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2024-03-03T10:42:00.662400Z |
| Discovery magnitude (MPC) | 20.48 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-05-23.0000000 |
| e | 1.00005834 |
| q (au) | 0.565948 |
| a (au) | -9700.877368 |
| i (deg) | 75.238589 |
| Ω (om, deg) | 108.082332 |
| ω (w, deg) | 243.634641 |
| M (ma, deg) | -0.000250 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.739 + 3.813\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.739 |
| n | 3.813 |
| gf | 1.000 |
| gb | -0.820 |
| k | 0.957 |
| 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 |
|---|---|---|---|
| 2024-02-15 | 2025-09-04 | +0.0413 | -0.110 |
| 2025-09-04 | 2025-11-07 | -3.1671 | +1.308 |
| 2025-11-07 | 2026-01-04 | +2.3715 | +0.343 |
| 2026-01-23 | 2026-02-28 | +4.6546 | -0.422 |
| 2026-02-28 | 2026-04-05 | +15.6796 | -0.818 |
| 2026-04-05 | 2026-04-28 | +5.9002 | +0.339 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 08:48:44.42 | +33:45:17.7 | HIP 43353 | 14.23 |
| 2026-09-20 12:00 | 08:49:06.75 | +33:47:33.3 | HIP 43353 | 10.39 |
| 2026-09-21 00:00 | 08:49:28.91 | +33:49:49.9 | HIP 43353 | 8.20 |
| 2026-09-21 12:00 | 08:49:50.90 | +33:52:07.6 | HIP 43353 | 8.93 |
| 2026-09-22 00:00 | 08:50:12.72 | +33:54:26.4 | HIP 43353 | 12.02 |
| 2026-09-22 12:00 | 08:50:34.37 | +33:56:46.4 | HIP 43471 | 15.46 |
| 2026-09-23 00:00 | 08:50:55.86 | +33:59:07.5 | HIP 43471 | 11.16 |
| 2026-09-23 12:00 | 08:51:17.16 | +34:01:29.8 | HIP 43471 | 7.78 |
| 2026-09-24 00:00 | 08:51:38.30 | +34:03:53.2 | HIP 43471 | 6.80 |
| 2026-09-24 12:00 | 08:51:59.26 | +34:06:17.8 | HIP 43561 | 3.69 |
| 2026-09-25 00:00 | 08:52:20.04 | +34:08:43.5 | HIP 43561 | 2.63 |
| 2026-09-25 12:00 | 08:52:40.65 | +34:11:10.4 | HIP 43561 | 6.99 |
| 2026-09-26 00:00 | 08:53:01.08 | +34:13:38.5 | HIP 43561 | 11.78 |
| 2026-09-26 12:00 | 08:53:21.34 | +34:16:07.8 | HIP 43561 | 16.61 |
| 2026-09-27 00:00 | 08:53:41.41 | +34:18:38.3 | HIP 43561 | 21.44 |
| 2026-09-27 12:00 | 08:54:01.30 | +34:21:10.1 | HIP 43561 | 26.25 |
| 2026-09-28 00:00 | 08:54:21.02 | +34:23:43.0 | HIP 43695 | 28.79 |
| 2026-09-28 12:00 | 08:54:40.54 | +34:26:17.2 | HIP 43695 | 27.23 |
| 2026-09-29 00:00 | 08:54:59.89 | +34:28:52.6 | HIP 43695 | 26.41 |
| 2026-09-29 12:00 | 08:55:19.05 | +34:31:29.3 | HIP 43695 | 26.39 |
| 2026-09-30 00:00 | 08:55:38.03 | +34:34:07.3 | HIP 43695 | 27.16 |
| 2026-09-30 12:00 | 08:55:56.81 | +34:36:46.5 | HIP 43949 | 28.32 |
| 2026-10-01 00:00 | 08:56:15.41 | +34:39:27.0 | HIP 43949 | 24.19 |
| 2026-10-01 12:00 | 08:56:33.82 | +34:42:08.7 | HIP 43949 | 20.29 |
| 2026-10-02 00:00 | 08:56:52.04 | +34:44:51.8 | HIP 43949 | 16.75 |
| 2026-10-02 12:00 | 08:57:10.07 | +34:47:36.2 | HIP 43949 | 13.84 |
| 2026-10-03 00:00 | 08:57:27.90 | +34:50:21.9 | HIP 43949 | 12.00 |
| 2026-10-03 12:00 | 08:57:45.53 | +34:53:09.0 | HIP 43949 | 11.72 |
| 2026-10-04 00:00 | 08:58:02.97 | +34:55:57.3 | HIP 43949 | 13.08 |
| 2026-10-04 12:00 | 08:58:20.21 | +34:58:47.0 | HIP 44128 | 11.92 |
| 2026-10-05 00:00 | 08:58:37.26 | +35:01:38.1 | HIP 44128 | 7.69 |
| 2026-10-05 12:00 | 08:58:54.10 | +35:04:30.5 | HIP 44128 | 4.17 |
| 2026-10-06 00:00 | 08:59:10.73 | +35:07:24.3 | HIP 44128 | 4.01 |
| 2026-10-06 12:00 | 08:59:27.17 | +35:10:19.5 | HIP 44128 | 7.41 |
| 2026-10-07 00:00 | 08:59:43.39 | +35:13:16.1 | HIP 44244 | 11.15 |
| 2026-10-07 12:00 | 08:59:59.41 | +35:16:14.0 | HIP 44244 | 8.58 |
| 2026-10-08 00:00 | 09:00:15.23 | +35:19:13.4 | HIP 44244 | 7.93 |
| 2026-10-08 12:00 | 09:00:30.83 | +35:22:14.1 | HIP 44244 | 9.56 |
| 2026-10-09 00:00 | 09:00:46.22 | +35:25:16.3 | HIP 44244 | 12.60 |
| 2026-10-09 12:00 | 09:01:01.39 | +35:28:19.9 | HIP 44244 | 16.27 |
| 2026-10-10 00:00 | 09:01:16.35 | +35:31:24.9 | HIP 44388 | 17.87 |
| 2026-10-10 12:00 | 09:01:31.09 | +35:34:31.4 | HIP 44335 | 17.23 |
| 2026-10-11 00:00 | 09:01:45.62 | +35:37:39.3 | HIP 44335 | 13.92 |