| Parameter |
Value |
| Designation |
43P/Wolf-Harrington |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-08-28T02:22:51.363840Z |
| Orbit solution date (soln_date, UTC) |
2026-07-22T10:30:13Z |
| Obs used |
3619 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-08-04.0000000 |
| e |
0.43859354 |
| q (au) |
2.418102 |
| a (au) |
4.307221 |
| i (deg) |
9.390117 |
| Ω (om, deg) |
244.413999 |
| ω (w, deg) |
224.052941 |
| M (ma, deg) |
158.429135 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.017 + 3.818\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.017 |
| n |
3.818 |
| gf |
1.000 |
| gb |
-0.986 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
13:01:05.29 |
-11:46:39.6 |
HIP 63610 |
25.86 |
| 2026-09-25 12:00 |
13:01:42.13 |
-11:49:52.7 |
HIP 63610 |
18.28 |
| 2026-09-26 00:00 |
13:02:18.98 |
-11:53:05.8 |
HIP 63610 |
13.52 |
| 2026-09-26 12:00 |
13:02:55.82 |
-11:56:18.9 |
HIP 63610 |
14.65 |
| 2026-09-27 00:00 |
13:03:32.67 |
-11:59:31.9 |
HIP 63610 |
20.72 |
| 2026-09-27 12:00 |
13:04:09.52 |
-12:02:44.9 |
HIP 63782 |
21.06 |
| 2026-09-28 00:00 |
13:04:46.37 |
-12:05:57.8 |
HIP 63897 |
21.28 |
| 2026-09-28 12:00 |
13:05:23.21 |
-12:09:10.7 |
HIP 63897 |
13.86 |
| 2026-09-29 00:00 |
13:06:00.06 |
-12:12:23.5 |
HIP 63897 |
10.69 |
| 2026-09-29 12:00 |
13:06:36.91 |
-12:15:36.2 |
HIP 63897 |
14.80 |
| 2026-09-30 00:00 |
13:07:13.76 |
-12:18:48.9 |
HIP 64032 |
21.43 |
| 2026-09-30 12:00 |
13:07:50.61 |
-12:22:01.5 |
HIP 64032 |
19.18 |
| 2026-10-01 00:00 |
13:08:27.46 |
-12:25:14.0 |
HIP 64164 |
12.02 |
| 2026-10-01 12:00 |
13:09:04.31 |
-12:28:26.4 |
HIP 64164 |
5.52 |
| 2026-10-02 00:00 |
13:09:41.15 |
-12:31:38.8 |
HIP 64164 |
9.95 |
| 2026-10-02 12:00 |
13:10:18.00 |
-12:34:51.0 |
HIP 64164 |
18.70 |
| 2026-10-03 00:00 |
13:10:54.84 |
-12:38:03.2 |
HIP 64404 |
21.45 |
| 2026-10-03 12:00 |
13:11:31.68 |
-12:41:15.3 |
HIP 64404 |
18.61 |
| 2026-10-04 00:00 |
13:12:08.51 |
-12:44:27.2 |
HIP 64356 |
18.30 |
| 2026-10-04 12:00 |
13:12:45.35 |
-12:47:39.1 |
HIP 64356 |
22.35 |
| 2026-10-05 00:00 |
13:13:22.18 |
-12:50:50.9 |
HIP 64356 |
29.08 |
| 2026-10-05 12:00 |
13:13:59.01 |
-12:54:02.5 |
HIP 64511 |
35.45 |
| 2026-10-06 00:00 |
13:14:35.83 |
-12:57:14.0 |
HIP 64750 |
31.10 |
| 2026-10-06 12:00 |
13:15:12.65 |
-13:00:25.4 |
HIP 64808 |
27.33 |
| 2026-10-07 00:00 |
13:15:49.46 |
-13:03:36.6 |
HIP 64808 |
17.81 |
| 2026-10-07 12:00 |
13:16:26.27 |
-13:06:47.8 |
HIP 64808 |
8.30 |
| 2026-10-08 00:00 |
13:17:03.07 |
-13:09:58.7 |
HIP 64808 |
1.21 |
| 2026-10-08 12:00 |
13:17:39.87 |
-13:13:09.6 |
HIP 64808 |
10.71 |
| 2026-10-09 00:00 |
13:18:16.66 |
-13:16:20.2 |
HIP 64952 |
9.25 |
| 2026-10-09 12:00 |
13:18:53.44 |
-13:19:30.7 |
HIP 64952 |
7.83 |
| 2026-10-10 00:00 |
13:19:30.21 |
-13:22:41.1 |
HIP 64952 |
14.74 |
| 2026-10-10 12:00 |
13:20:06.97 |
-13:25:51.3 |
HIP 64952 |
23.52 |
| 2026-10-11 00:00 |
13:20:43.73 |
-13:29:01.3 |
HIP 64952 |
32.69 |
| 2026-10-11 12:00 |
13:21:20.48 |
-13:32:11.1 |
HIP 65283 |
29.50 |
| 2026-10-12 00:00 |
13:21:57.21 |
-13:35:20.8 |
HIP 65354 |
25.30 |
| 2026-10-12 12:00 |
13:22:33.94 |
-13:38:30.2 |
HIP 65354 |
16.12 |
| 2026-10-13 00:00 |
13:23:10.65 |
-13:41:39.5 |
HIP 65354 |
7.70 |
| 2026-10-13 12:00 |
13:23:47.35 |
-13:44:48.5 |
HIP 65354 |
6.12 |
| 2026-10-14 00:00 |
13:24:24.04 |
-13:47:57.4 |
HIP 65354 |
13.94 |
| 2026-10-14 12:00 |
13:25:00.72 |
-13:51:06.0 |
HIP 65362 |
21.80 |
| 2026-10-15 00:00 |
13:25:37.38 |
-13:54:14.4 |
HIP 65362 |
28.63 |
| 2026-10-15 12:00 |
13:26:14.03 |
-13:57:22.6 |
HIP 65680 |
34.48 |
| 2026-10-16 00:00 |
13:26:50.67 |
-14:00:30.6 |
HIP 65680 |
31.02 |