43P/Wolf-Harrington
Metadata
| Parameter | Value |
|---|---|
| Designation | 43P/Wolf-Harrington |
| Type | P |
| Perihelion (tp_cal, UTC) | 2016-08-28T22:49:36.215040Z |
| Orbit solution date (soln_date, UTC) | 2026-05-11T09:35:11Z |
| Obs used | 3568 |
| NEO | - |
| M1 | 10.500 |
| K1 | 10.750 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-07-08.0000000 |
| e | 0.43894969 |
| q (au) | 2.416093 |
| a (au) | 4.306376 |
| i (deg) | 9.397521 |
| Ω (om, deg) | 244.444515 |
| ω (w, deg) | 224.037096 |
| M (ma, deg) | 155.404033 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.825 + 4.372\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.825 |
| n | 4.372 |
| gf | 0.969 |
| gb | -0.924 |
| k | 1.000 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2023-09-11 | 2025-01-13 | -1.5241 | +0.734 |
| 2025-01-13 | 2024-09-22 | -8.9618 | +4.284 |
| 2024-09-22 | 2026-05-16 | +10.1242 | -5.698 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 10:43:19.60 | -02:43:38.6 | HIP 52543 | 24.06 |
| 2026-05-12 12:00 | 10:43:33.40 | -02:42:53.6 | HIP 52543 | 20.97 |
| 2026-05-13 00:00 | 10:43:47.45 | -02:42:10.6 | HIP 52543 | 18.03 |
| 2026-05-13 12:00 | 10:44:01.73 | -02:41:29.4 | HIP 52543 | 15.36 |
| 2026-05-14 00:00 | 10:44:16.25 | -02:40:50.1 | HIP 52543 | 13.17 |
| 2026-05-14 12:00 | 10:44:31.01 | -02:40:12.7 | HIP 52543 | 11.78 |
| 2026-05-15 00:00 | 10:44:46.00 | -02:39:37.2 | HIP 52543 | 11.54 |
| 2026-05-15 12:00 | 10:45:01.23 | -02:39:03.5 | HIP 52543 | 12.55 |
| 2026-05-16 00:00 | 10:45:16.70 | -02:38:31.8 | HIP 52543 | 14.61 |
| 2026-05-16 12:00 | 10:45:32.39 | -02:38:01.9 | HIP 52669 | 15.06 |
| 2026-05-17 00:00 | 10:45:48.31 | -02:37:33.9 | HIP 52669 | 12.41 |
| 2026-05-17 12:00 | 10:46:04.46 | -02:37:07.8 | HIP 52669 | 10.67 |
| 2026-05-18 00:00 | 10:46:20.84 | -02:36:43.6 | HIP 52669 | 10.37 |
| 2026-05-18 12:00 | 10:46:37.44 | -02:36:21.2 | HIP 52669 | 11.68 |
| 2026-05-19 00:00 | 10:46:54.26 | -02:36:00.6 | HIP 52669 | 14.20 |
| 2026-05-19 12:00 | 10:47:11.30 | -02:35:42.0 | HIP 52669 | 17.45 |
| 2026-05-20 00:00 | 10:47:28.56 | -02:35:25.1 | HIP 52669 | 21.13 |
| 2026-05-20 12:00 | 10:47:46.04 | -02:35:10.1 | HIP 52669 | 25.08 |
| 2026-05-21 00:00 | 10:48:03.73 | -02:34:56.9 | HIP 52669 | 29.21 |
| 2026-05-21 12:00 | 10:48:21.63 | -02:34:45.6 | HIP 52669 | 33.47 |
| 2026-05-22 00:00 | 10:48:39.75 | -02:34:36.1 | HIP 52863 | 37.07 |
| 2026-05-22 12:00 | 10:48:58.07 | -02:34:28.3 | HIP 52863 | 37.20 |
| 2026-05-23 00:00 | 10:49:16.60 | -02:34:22.4 | HIP 53094 | 37.15 |
| 2026-05-23 12:00 | 10:49:35.34 | -02:34:18.3 | HIP 53094 | 32.54 |
| 2026-05-24 00:00 | 10:49:54.27 | -02:34:15.9 | HIP 53094 | 27.90 |
| 2026-05-24 12:00 | 10:50:13.41 | -02:34:15.4 | HIP 53094 | 23.26 |
| 2026-05-25 00:00 | 10:50:32.75 | -02:34:16.6 | HIP 53094 | 18.66 |
| 2026-05-25 12:00 | 10:50:52.28 | -02:34:19.5 | HIP 53094 | 14.18 |
| 2026-05-26 00:00 | 10:51:12.01 | -02:34:24.2 | HIP 53094 | 10.05 |
| 2026-05-26 12:00 | 10:51:31.93 | -02:34:30.6 | HIP 53094 | 7.05 |
| 2026-05-27 00:00 | 10:51:52.05 | -02:34:38.8 | HIP 53094 | 6.97 |
| 2026-05-27 12:00 | 10:52:12.35 | -02:34:48.7 | HIP 53094 | 9.95 |
| 2026-05-28 00:00 | 10:52:32.84 | -02:35:00.2 | HIP 53094 | 14.23 |
| 2026-05-28 12:00 | 10:52:53.52 | -02:35:13.5 | HIP 53094 | 18.98 |
| 2026-05-29 00:00 | 10:53:14.38 | -02:35:28.5 | HIP 53240 | 20.35 |
| 2026-05-29 12:00 | 10:53:35.43 | -02:35:45.2 | HIP 53240 | 20.62 |
| 2026-05-30 00:00 | 10:53:56.65 | -02:36:03.5 | HIP 53369 | 19.74 |
| 2026-05-30 12:00 | 10:54:18.06 | -02:36:23.5 | HIP 53369 | 16.39 |
| 2026-05-31 00:00 | 10:54:39.64 | -02:36:45.2 | HIP 53369 | 14.27 |
| 2026-05-31 12:00 | 10:55:01.40 | -02:37:08.5 | HIP 53369 | 14.02 |
| 2026-06-01 00:00 | 10:55:23.33 | -02:37:33.5 | HIP 53369 | 15.78 |
| 2026-06-01 12:00 | 10:55:45.43 | -02:38:00.1 | HIP 53443 | 15.91 |
| 2026-06-02 00:00 | 10:56:07.71 | -02:38:28.3 | HIP 53443 | 15.25 |