| Parameter |
Value |
| Designation |
C/1951 P1 (Wilson-Harrington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1952-01-12T22:44:16.137600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
23 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
14.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1951-09-13.0000000 |
| e |
0.99977514 |
| q (au) |
0.740399 |
| a (au) |
3292.688104 |
| i (deg) |
152.531339 |
| Ω (om, deg) |
76.894641 |
| ω (w, deg) |
269.622126 |
| M (ma, deg) |
359.999364 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.987 + 3.458\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.987 |
| n |
3.458 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.876 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
23:10:37.09 |
+24:15:28.7 |
HIP 114467 |
4.92 |
| 2026-07-29 12:00 |
23:10:36.16 |
+24:15:29.8 |
HIP 114467 |
5.10 |
| 2026-07-30 00:00 |
23:10:35.22 |
+24:15:30.7 |
HIP 114467 |
5.28 |
| 2026-07-30 12:00 |
23:10:34.28 |
+24:15:31.5 |
HIP 114467 |
5.47 |
| 2026-07-31 00:00 |
23:10:33.32 |
+24:15:32.3 |
HIP 114467 |
5.65 |
| 2026-07-31 12:00 |
23:10:32.37 |
+24:15:33.0 |
HIP 114467 |
5.85 |
| 2026-08-01 00:00 |
23:10:31.40 |
+24:15:33.5 |
HIP 114467 |
6.05 |
| 2026-08-01 12:00 |
23:10:30.43 |
+24:15:34.0 |
HIP 114467 |
6.25 |
| 2026-08-02 00:00 |
23:10:29.45 |
+24:15:34.4 |
HIP 114467 |
6.45 |
| 2026-08-02 12:00 |
23:10:28.47 |
+24:15:34.7 |
HIP 114467 |
6.66 |
| 2026-08-03 00:00 |
23:10:27.48 |
+24:15:34.9 |
HIP 114467 |
6.87 |
| 2026-08-03 12:00 |
23:10:26.48 |
+24:15:35.0 |
HIP 114467 |
7.08 |
| 2026-08-04 00:00 |
23:10:25.48 |
+24:15:35.1 |
HIP 114467 |
7.30 |
| 2026-08-04 12:00 |
23:10:24.47 |
+24:15:35.0 |
HIP 114467 |
7.51 |
| 2026-08-05 00:00 |
23:10:23.45 |
+24:15:34.9 |
HIP 114467 |
7.73 |
| 2026-08-05 12:00 |
23:10:22.43 |
+24:15:34.6 |
HIP 114467 |
7.96 |
| 2026-08-06 00:00 |
23:10:21.41 |
+24:15:34.3 |
HIP 114467 |
8.18 |
| 2026-08-06 12:00 |
23:10:20.37 |
+24:15:33.9 |
HIP 114467 |
8.41 |
| 2026-08-07 00:00 |
23:10:19.34 |
+24:15:33.3 |
HIP 114467 |
8.64 |
| 2026-08-07 12:00 |
23:10:18.29 |
+24:15:32.7 |
HIP 114467 |
8.87 |
| 2026-08-08 00:00 |
23:10:17.24 |
+24:15:32.0 |
HIP 114467 |
9.10 |
| 2026-08-08 12:00 |
23:10:16.19 |
+24:15:31.2 |
HIP 114467 |
9.34 |
| 2026-08-09 00:00 |
23:10:15.13 |
+24:15:30.4 |
HIP 114351 |
9.33 |
| 2026-08-09 12:00 |
23:10:14.06 |
+24:15:29.4 |
HIP 114351 |
9.09 |
| 2026-08-10 00:00 |
23:10:12.99 |
+24:15:28.3 |
HIP 114351 |
8.84 |
| 2026-08-10 12:00 |
23:10:11.92 |
+24:15:27.2 |
HIP 114351 |
8.60 |
| 2026-08-11 00:00 |
23:10:10.84 |
+24:15:25.9 |
HIP 114351 |
8.35 |
| 2026-08-11 12:00 |
23:10:09.75 |
+24:15:24.6 |
HIP 114351 |
8.11 |
| 2026-08-12 00:00 |
23:10:08.66 |
+24:15:23.1 |
HIP 114351 |
7.86 |
| 2026-08-12 12:00 |
23:10:07.57 |
+24:15:21.6 |
HIP 114351 |
7.61 |
| 2026-08-13 00:00 |
23:10:06.47 |
+24:15:20.0 |
HIP 114351 |
7.36 |
| 2026-08-13 12:00 |
23:10:05.36 |
+24:15:18.3 |
HIP 114351 |
7.11 |
| 2026-08-14 00:00 |
23:10:04.25 |
+24:15:16.5 |
HIP 114351 |
6.86 |
| 2026-08-14 12:00 |
23:10:03.14 |
+24:15:14.6 |
HIP 114351 |
6.61 |
| 2026-08-15 00:00 |
23:10:02.02 |
+24:15:12.6 |
HIP 114351 |
6.35 |
| 2026-08-15 12:00 |
23:10:00.90 |
+24:15:10.6 |
HIP 114351 |
6.10 |
| 2026-08-16 00:00 |
23:09:59.77 |
+24:15:08.4 |
HIP 114351 |
5.85 |
| 2026-08-16 12:00 |
23:09:58.64 |
+24:15:06.1 |
HIP 114351 |
5.59 |
| 2026-08-17 00:00 |
23:09:57.50 |
+24:15:03.8 |
HIP 114351 |
5.34 |
| 2026-08-17 12:00 |
23:09:56.36 |
+24:15:01.4 |
HIP 114351 |
5.09 |
| 2026-08-18 00:00 |
23:09:55.22 |
+24:14:58.8 |
HIP 114351 |
4.83 |
| 2026-08-18 12:00 |
23:09:54.07 |
+24:14:56.2 |
HIP 114351 |
4.58 |
| 2026-08-19 00:00 |
23:09:52.92 |
+24:14:53.5 |
HIP 114351 |
4.33 |