43P/Wolf-Harrington
Metadata
| Parameter | Value |
|---|---|
| Designation | 43P/Wolf-Harrington |
| Type | P |
| Perihelion (tp_cal, UTC) | 2016-09-01T22:26:32.925120Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T14:04:59Z |
| Obs used | 3400 |
| NEO | - |
| M1 | 10.600 |
| K1 | 10.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-03-26.0000000 |
| e | 0.44083017 |
| q (au) | 2.405619 |
| a (au) | 4.302125 |
| i (deg) | 9.439315 |
| Ω (om, deg) | 244.594211 |
| ω (w, deg) | 223.939062 |
| M (ma, deg) | 143.707171 |
Magnitude
Scatter + Global Linear
$$ M_a = (10.881 + 4.953\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 10.881 |
| n | 4.953 |
| gf | 0.998 |
| gb | -0.617 |
| 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 |
|---|---|---|---|
| 2023-09-11 | 2024-12-11 | +0.4902 | -0.085 |
| 2024-12-11 | 2026-03-25 | +3.4365 | -1.894 |
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 | 10:42:43.16 | -06:03:11.7 | HIP 52388 | 14.83 |
| 2026-03-26 12:00 | 10:42:29.93 | -06:00:07.6 | HIP 52388 | 11.36 |
| 2026-03-27 00:00 | 10:42:16.95 | -05:57:03.8 | HIP 52388 | 8.84 |
| 2026-03-27 12:00 | 10:42:04.24 | -05:54:00.4 | HIP 52388 | 8.14 |
| 2026-03-28 00:00 | 10:41:51.79 | -05:50:57.4 | HIP 52388 | 9.59 |
| 2026-03-28 12:00 | 10:41:39.61 | -05:47:54.8 | HIP 52388 | 12.40 |
| 2026-03-29 00:00 | 10:41:27.70 | -05:44:52.7 | HIP 52388 | 15.81 |
| 2026-03-29 12:00 | 10:41:16.07 | -05:41:51.1 | HIP 52388 | 19.49 |
| 2026-03-30 00:00 | 10:41:04.71 | -05:38:50.1 | HIP 52388 | 23.28 |
| 2026-03-30 12:00 | 10:40:53.63 | -05:35:49.7 | HIP 52388 | 27.10 |
| 2026-03-31 00:00 | 10:40:42.83 | -05:32:49.9 | HIP 52143 | 30.77 |
| 2026-03-31 12:00 | 10:40:32.32 | -05:29:50.8 | HIP 52143 | 31.00 |
| 2026-04-01 00:00 | 10:40:22.08 | -05:26:52.4 | HIP 52143 | 31.75 |
| 2026-04-01 12:00 | 10:40:12.13 | -05:23:54.8 | HIP 52143 | 32.97 |
| 2026-04-02 00:00 | 10:40:02.47 | -05:20:57.9 | HIP 52143 | 34.60 |
| 2026-04-02 12:00 | 10:39:53.10 | -05:18:01.9 | HIP 52143 | 36.56 |
| 2026-04-03 00:00 | 10:39:44.02 | -05:15:06.7 | HIP 52143 | 38.79 |
| 2026-04-03 12:00 | 10:39:35.23 | -05:12:12.4 | HIP 52143 | 41.22 |
| 2026-04-04 00:00 | 10:39:26.74 | -05:09:19.1 | HIP 52143 | 43.82 |
| 2026-04-04 12:00 | 10:39:18.54 | -05:06:26.6 | HIP 51930 | 45.20 |
| 2026-04-05 00:00 | 10:39:10.64 | -05:03:35.2 | HIP 51930 | 42.36 |
| 2026-04-05 12:00 | 10:39:03.03 | -05:00:44.8 | HIP 51930 | 39.70 |
| 2026-04-06 00:00 | 10:38:55.72 | -04:57:55.4 | HIP 51930 | 37.23 |
| 2026-04-06 12:00 | 10:38:48.72 | -04:55:07.2 | HIP 51930 | 35.00 |
| 2026-04-07 00:00 | 10:38:42.01 | -04:52:20.0 | HIP 51930 | 33.01 |
| 2026-04-07 12:00 | 10:38:35.61 | -04:49:34.0 | HIP 51930 | 31.32 |
| 2026-04-08 00:00 | 10:38:29.51 | -04:46:49.1 | HIP 51930 | 29.94 |
| 2026-04-08 12:00 | 10:38:23.72 | -04:44:05.4 | HIP 51930 | 28.91 |
| 2026-04-09 00:00 | 10:38:18.23 | -04:41:23.0 | HIP 51930 | 28.25 |
| 2026-04-09 12:00 | 10:38:13.04 | -04:38:41.8 | HIP 51930 | 27.97 |
| 2026-04-10 00:00 | 10:38:08.16 | -04:36:01.9 | HIP 51930 | 28.06 |
| 2026-04-10 12:00 | 10:38:03.59 | -04:33:23.4 | HIP 51930 | 28.50 |
| 2026-04-11 00:00 | 10:37:59.33 | -04:30:46.1 | HIP 51930 | 29.27 |
| 2026-04-11 12:00 | 10:37:55.37 | -04:28:10.2 | HIP 51930 | 30.32 |
| 2026-04-12 00:00 | 10:37:51.73 | -04:25:35.7 | HIP 51930 | 31.61 |
| 2026-04-12 12:00 | 10:37:48.39 | -04:23:02.7 | HIP 51930 | 33.10 |
| 2026-04-13 00:00 | 10:37:45.36 | -04:20:31.0 | HIP 51864 | 33.67 |
| 2026-04-13 12:00 | 10:37:42.65 | -04:18:00.8 | HIP 51864 | 34.37 |
| 2026-04-14 00:00 | 10:37:40.24 | -04:15:32.2 | HIP 51864 | 35.29 |
| 2026-04-14 12:00 | 10:37:38.14 | -04:13:05.0 | HIP 51864 | 36.41 |
| 2026-04-15 00:00 | 10:37:36.36 | -04:10:39.3 | HIP 51864 | 37.70 |
| 2026-04-15 12:00 | 10:37:34.88 | -04:08:15.2 | HIP 51864 | 39.14 |
| 2026-04-16 00:00 | 10:37:33.72 | -04:05:52.7 | HIP 51864 | 40.71 |