| 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) |
| 2026-06-01 00:00 |
23:11:27.05 |
+24:04:32.4 |
HIP 114467 |
15.20 |
| 2026-06-01 12:00 |
23:11:27.18 |
+24:04:41.7 |
HIP 114467 |
15.08 |
| 2026-06-02 00:00 |
23:11:27.30 |
+24:04:50.9 |
HIP 114467 |
14.96 |
| 2026-06-02 12:00 |
23:11:27.40 |
+24:05:00.1 |
HIP 114467 |
14.84 |
| 2026-06-03 00:00 |
23:11:27.50 |
+24:05:09.2 |
HIP 114467 |
14.72 |
| 2026-06-03 12:00 |
23:11:27.59 |
+24:05:18.3 |
HIP 114467 |
14.59 |
| 2026-06-04 00:00 |
23:11:27.66 |
+24:05:27.3 |
HIP 114467 |
14.47 |
| 2026-06-04 12:00 |
23:11:27.73 |
+24:05:36.3 |
HIP 114467 |
14.35 |
| 2026-06-05 00:00 |
23:11:27.79 |
+24:05:45.3 |
HIP 114467 |
14.23 |
| 2026-06-05 12:00 |
23:11:27.83 |
+24:05:54.2 |
HIP 114467 |
14.11 |
| 2026-06-06 00:00 |
23:11:27.87 |
+24:06:03.1 |
HIP 114467 |
13.98 |
| 2026-06-06 12:00 |
23:11:27.90 |
+24:06:11.9 |
HIP 114467 |
13.86 |
| 2026-06-07 00:00 |
23:11:27.91 |
+24:06:20.7 |
HIP 114467 |
13.74 |
| 2026-06-07 12:00 |
23:11:27.92 |
+24:06:29.4 |
HIP 114467 |
13.62 |
| 2026-06-08 00:00 |
23:11:27.91 |
+24:06:38.1 |
HIP 114467 |
13.50 |
| 2026-06-08 12:00 |
23:11:27.90 |
+24:06:46.7 |
HIP 114467 |
13.37 |
| 2026-06-09 00:00 |
23:11:27.87 |
+24:06:55.3 |
HIP 114467 |
13.25 |
| 2026-06-09 12:00 |
23:11:27.84 |
+24:07:03.8 |
HIP 114467 |
13.13 |
| 2026-06-10 00:00 |
23:11:27.80 |
+24:07:12.3 |
HIP 114467 |
13.01 |
| 2026-06-10 12:00 |
23:11:27.74 |
+24:07:20.7 |
HIP 114467 |
12.88 |
| 2026-06-11 00:00 |
23:11:27.68 |
+24:07:29.0 |
HIP 114467 |
12.76 |
| 2026-06-11 12:00 |
23:11:27.60 |
+24:07:37.4 |
HIP 114467 |
12.64 |
| 2026-06-12 00:00 |
23:11:27.52 |
+24:07:45.6 |
HIP 114467 |
12.51 |
| 2026-06-12 12:00 |
23:11:27.42 |
+24:07:53.8 |
HIP 114467 |
12.39 |
| 2026-06-13 00:00 |
23:11:27.31 |
+24:08:02.0 |
HIP 114467 |
12.27 |
| 2026-06-13 12:00 |
23:11:27.20 |
+24:08:10.1 |
HIP 114467 |
12.14 |
| 2026-06-14 00:00 |
23:11:27.07 |
+24:08:18.1 |
HIP 114467 |
12.02 |
| 2026-06-14 12:00 |
23:11:26.94 |
+24:08:26.1 |
HIP 114467 |
11.89 |
| 2026-06-15 00:00 |
23:11:26.79 |
+24:08:34.0 |
HIP 114467 |
11.76 |
| 2026-06-15 12:00 |
23:11:26.63 |
+24:08:41.9 |
HIP 114467 |
11.64 |
| 2026-06-16 00:00 |
23:11:26.47 |
+24:08:49.7 |
HIP 114467 |
11.51 |
| 2026-06-16 12:00 |
23:11:26.29 |
+24:08:57.4 |
HIP 114467 |
11.39 |
| 2026-06-17 00:00 |
23:11:26.10 |
+24:09:05.1 |
HIP 114467 |
11.26 |
| 2026-06-17 12:00 |
23:11:25.91 |
+24:09:12.7 |
HIP 114467 |
11.13 |
| 2026-06-18 00:00 |
23:11:25.70 |
+24:09:20.3 |
HIP 114467 |
11.00 |
| 2026-06-18 12:00 |
23:11:25.48 |
+24:09:27.8 |
HIP 114467 |
10.87 |
| 2026-06-19 00:00 |
23:11:25.26 |
+24:09:35.2 |
HIP 114467 |
10.74 |
| 2026-06-19 12:00 |
23:11:25.02 |
+24:09:42.6 |
HIP 114467 |
10.61 |
| 2026-06-20 00:00 |
23:11:24.77 |
+24:09:49.9 |
HIP 114467 |
10.48 |
| 2026-06-20 12:00 |
23:11:24.51 |
+24:09:57.1 |
HIP 114467 |
10.35 |
| 2026-06-21 00:00 |
23:11:24.25 |
+24:10:04.3 |
HIP 114467 |
10.22 |
| 2026-06-21 12:00 |
23:11:23.97 |
+24:10:11.4 |
HIP 114467 |
10.09 |
| 2026-06-22 00:00 |
23:11:23.68 |
+24:10:18.5 |
HIP 114467 |
9.96 |