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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 07:56:14.43 | +30:53:17.9 | HIP 38663 | 16.49 |
| 2026-07-29 12:00 | 07:56:50.23 | +30:54:38.7 | HIP 38663 | 24.27 |
| 2026-07-30 00:00 | 07:57:25.93 | +30:55:59.4 | HIP 39031 | 25.74 |
| 2026-07-30 12:00 | 07:58:01.54 | +30:57:20.0 | HIP 39031 | 20.38 |
| 2026-07-31 00:00 | 07:58:37.04 | +30:58:40.6 | HIP 39031 | 17.01 |
| 2026-07-31 12:00 | 07:59:12.43 | +31:00:01.1 | HIP 39031 | 16.82 |
| 2026-08-01 00:00 | 07:59:47.73 | +31:01:21.6 | HIP 39031 | 19.88 |
| 2026-08-01 12:00 | 08:00:22.93 | +31:02:42.1 | HIP 39259 | 18.63 |
| 2026-08-02 00:00 | 08:00:58.02 | +31:04:02.5 | HIP 39259 | 11.38 |
| 2026-08-02 12:00 | 08:01:33.02 | +31:05:22.9 | HIP 39259 | 5.35 |
| 2026-08-03 00:00 | 08:02:07.91 | +31:06:43.4 | HIP 39259 | 6.58 |
| 2026-08-03 12:00 | 08:02:42.69 | +31:08:03.8 | HIP 39259 | 13.13 |
| 2026-08-04 00:00 | 08:03:17.38 | +31:09:24.3 | HIP 39259 | 20.37 |
| 2026-08-04 12:00 | 08:03:51.96 | +31:10:44.8 | HIP 39605 | 23.73 |
| 2026-08-05 00:00 | 08:04:26.44 | +31:12:05.4 | HIP 39605 | 16.40 |
| 2026-08-05 12:00 | 08:05:00.82 | +31:13:26.1 | HIP 39605 | 9.35 |
| 2026-08-06 00:00 | 08:05:35.09 | +31:14:46.8 | HIP 39605 | 4.17 |
| 2026-08-06 12:00 | 08:06:09.26 | +31:16:07.6 | HIP 39605 | 7.61 |
| 2026-08-07 00:00 | 08:06:43.32 | +31:17:28.5 | HIP 39605 | 14.42 |
| 2026-08-07 12:00 | 08:07:17.28 | +31:18:49.5 | HIP 39767 | 15.04 |
| 2026-08-08 00:00 | 08:07:51.13 | +31:20:10.7 | HIP 39767 | 13.13 |
| 2026-08-08 12:00 | 08:08:24.88 | +31:21:32.0 | HIP 39767 | 15.03 |
| 2026-08-09 00:00 | 08:08:58.52 | +31:22:53.4 | HIP 39767 | 19.64 |
| 2026-08-09 12:00 | 08:09:32.05 | +31:24:15.0 | HIP 39767 | 25.52 |
| 2026-08-10 00:00 | 08:10:05.47 | +31:25:36.8 | HIP 40103 | 19.69 |
| 2026-08-10 12:00 | 08:10:38.79 | +31:26:58.7 | HIP 40103 | 14.15 |
| 2026-08-11 00:00 | 08:11:12.00 | +31:28:20.9 | HIP 40103 | 10.86 |
| 2026-08-11 12:00 | 08:11:45.10 | +31:29:43.2 | HIP 40103 | 11.83 |
| 2026-08-12 00:00 | 08:12:18.08 | +31:31:05.8 | HIP 40103 | 16.28 |
| 2026-08-12 12:00 | 08:12:50.96 | +31:32:28.7 | HIP 40103 | 22.19 |
| 2026-08-13 00:00 | 08:13:23.72 | +31:33:51.7 | HIP 40398 | 24.84 |
| 2026-08-13 12:00 | 08:13:56.38 | +31:35:15.1 | HIP 40398 | 21.22 |
| 2026-08-14 00:00 | 08:14:28.92 | +31:36:38.7 | HIP 40398 | 19.62 |
| 2026-08-14 12:00 | 08:15:01.34 | +31:38:02.6 | HIP 40398 | 20.49 |
| 2026-08-15 00:00 | 08:15:33.66 | +31:39:26.7 | HIP 40398 | 23.54 |
| 2026-08-15 12:00 | 08:16:05.85 | +31:40:51.2 | HIP 40398 | 28.05 |
| 2026-08-16 00:00 | 08:16:37.94 | +31:42:16.0 | HIP 40715 | 26.59 |
| 2026-08-16 12:00 | 08:17:09.90 | +31:43:41.2 | HIP 40715 | 19.65 |
| 2026-08-17 00:00 | 08:17:41.76 | +31:45:06.7 | HIP 40715 | 12.74 |
| 2026-08-17 12:00 | 08:18:13.49 | +31:46:32.5 | HIP 40715 | 5.87 |
| 2026-08-18 00:00 | 08:18:45.11 | +31:47:58.7 | HIP 40715 | 1.34 |
| 2026-08-18 12:00 | 08:19:16.61 | +31:49:25.3 | HIP 40715 | 7.94 |
| 2026-08-19 00:00 | 08:19:47.99 | +31:50:52.2 | HIP 40715 | 14.74 |