43P/Wolf-Harrington
Metadata
| Parameter | Value |
|---|---|
| Designation | 43P/Wolf-Harrington |
| Type | P |
| Perihelion (tp_cal, UTC) | 2016-10-11T12:57:00.472320Z |
| Orbit solution date (soln_date, UTC) | 2026-01-13T22:30:04Z |
| Obs used | 2987 |
| NEO | - |
| M1 | 10.500 |
| K1 | 10.500 |
| PC | 0.030 |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2019-05-23.0000000 |
| e | 0.46922833 |
| q (au) | 2.257023 |
| a (au) | 4.252343 |
| i (deg) | 10.380724 |
| Ω (om, deg) | 246.037372 |
| ω (w, deg) | 222.167459 |
| M (ma, deg) | 107.167791 |
Magnitude
Scatter + Global Linear
$$ M_a = (9.826 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 9.826 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.659 |
| 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 | 2024-09-22 | -3.1601 | +1.409 |
| 2024-09-22 | 2026-02-07 | +7.0853 | -4.108 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 11:12:30.78 | -09:20:13.4 | HIP 54722 | 10.03 |
| 2026-02-03 12:00 | 11:12:19.13 | -09:20:27.5 | HIP 54722 | 8.82 |
| 2026-02-04 00:00 | 11:12:07.18 | -09:20:38.5 | HIP 54722 | 8.53 |
| 2026-02-04 12:00 | 11:11:54.95 | -09:20:46.3 | HIP 54722 | 9.30 |
| 2026-02-05 00:00 | 11:11:42.43 | -09:20:50.9 | HIP 54722 | 10.97 |
| 2026-02-05 12:00 | 11:11:29.63 | -09:20:52.3 | HIP 54722 | 13.26 |
| 2026-02-06 00:00 | 11:11:16.56 | -09:20:50.5 | HIP 54609 | 11.37 |
| 2026-02-06 12:00 | 11:11:03.21 | -09:20:45.5 | HIP 54609 | 8.43 |
| 2026-02-07 00:00 | 11:10:49.59 | -09:20:37.3 | HIP 54609 | 5.89 |
| 2026-02-07 12:00 | 11:10:35.71 | -09:20:26.0 | HIP 54609 | 4.60 |
| 2026-02-08 00:00 | 11:10:21.56 | -09:20:11.4 | HIP 54609 | 5.67 |
| 2026-02-08 12:00 | 11:10:07.16 | -09:19:53.7 | HIP 54609 | 8.30 |
| 2026-02-09 00:00 | 11:09:52.50 | -09:19:32.7 | HIP 54609 | 11.53 |
| 2026-02-09 12:00 | 11:09:37.59 | -09:19:08.6 | HIP 54609 | 15.03 |
| 2026-02-10 00:00 | 11:09:22.44 | -09:18:41.3 | HIP 54609 | 18.67 |
| 2026-02-10 12:00 | 11:09:07.04 | -09:18:10.8 | HIP 54609 | 22.43 |
| 2026-02-11 00:00 | 11:08:51.42 | -09:17:37.2 | HIP 54609 | 26.29 |
| 2026-02-11 12:00 | 11:08:35.56 | -09:17:00.4 | HIP 54609 | 30.22 |
| 2026-02-12 00:00 | 11:08:19.47 | -09:16:20.5 | HIP 54609 | 34.22 |
| 2026-02-12 12:00 | 11:08:03.17 | -09:15:37.4 | HIP 54609 | 38.30 |
| 2026-02-13 00:00 | 11:07:46.64 | -09:14:51.2 | HIP 54361 | 39.49 |
| 2026-02-13 12:00 | 11:07:29.91 | -09:14:01.8 | HIP 54361 | 38.12 |
| 2026-02-14 00:00 | 11:07:12.98 | -09:13:09.4 | HIP 54361 | 37.13 |
| 2026-02-14 12:00 | 11:06:55.84 | -09:12:13.9 | HIP 54361 | 36.58 |
| 2026-02-15 00:00 | 11:06:38.51 | -09:11:15.3 | HIP 54361 | 36.49 |
| 2026-02-15 12:00 | 11:06:20.99 | -09:10:13.6 | HIP 54078 | 35.92 |
| 2026-02-16 00:00 | 11:06:03.29 | -09:09:09.0 | HIP 54078 | 31.44 |
| 2026-02-16 12:00 | 11:05:45.41 | -09:08:01.3 | HIP 54078 | 26.92 |
| 2026-02-17 00:00 | 11:05:27.36 | -09:06:50.6 | HIP 54078 | 22.37 |
| 2026-02-17 12:00 | 11:05:09.15 | -09:05:36.9 | HIP 54078 | 17.80 |
| 2026-02-18 00:00 | 11:04:50.78 | -09:04:20.3 | HIP 54078 | 13.26 |
| 2026-02-18 12:00 | 11:04:32.26 | -09:03:00.7 | HIP 54078 | 8.87 |
| 2026-02-19 00:00 | 11:04:13.59 | -09:01:38.2 | HIP 54078 | 5.19 |
| 2026-02-19 12:00 | 11:03:54.78 | -09:00:12.9 | HIP 54078 | 4.68 |
| 2026-02-20 00:00 | 11:03:35.84 | -08:58:44.7 | HIP 54078 | 8.06 |
| 2026-02-20 12:00 | 11:03:16.77 | -08:57:13.7 | HIP 54078 | 12.54 |
| 2026-02-21 00:00 | 11:02:57.58 | -08:55:39.9 | HIP 54078 | 17.33 |
| 2026-02-21 12:00 | 11:02:38.28 | -08:54:03.4 | HIP 54078 | 22.26 |
| 2026-02-22 00:00 | 11:02:18.87 | -08:52:24.1 | HIP 54078 | 27.27 |
| 2026-02-22 12:00 | 11:01:59.37 | -08:50:42.1 | HIP 54015 | 31.22 |
| 2026-02-23 00:00 | 11:01:39.77 | -08:48:57.5 | HIP 54015 | 32.44 |
| 2026-02-23 12:00 | 11:01:20.08 | -08:47:10.2 | HIP 54015 | 34.38 |
| 2026-02-24 00:00 | 11:01:00.31 | -08:45:20.4 | HIP 53671 | 32.15 |