C/1951 P1 (Wilson-Harrington)
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1951-08-09 |
1952-01-06 |
+4.4143 |
+0.699 |
| 1952-01-13 |
1952-03-14 |
-1.9567 |
-0.137 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:07:54.59 |
+23:34:21.1 |
HIP 114350 |
22.74 |
| 2026-02-03 12:00 |
23:07:55.61 |
+23:34:21.5 |
HIP 114350 |
22.50 |
| 2026-02-04 00:00 |
23:07:56.63 |
+23:34:22.0 |
HIP 114350 |
22.27 |
| 2026-02-04 12:00 |
23:07:57.66 |
+23:34:22.6 |
HIP 114350 |
22.03 |
| 2026-02-05 00:00 |
23:07:58.70 |
+23:34:23.3 |
HIP 114350 |
21.79 |
| 2026-02-05 12:00 |
23:07:59.74 |
+23:34:24.0 |
HIP 114350 |
21.55 |
| 2026-02-06 00:00 |
23:08:00.79 |
+23:34:24.9 |
HIP 114350 |
21.31 |
| 2026-02-06 12:00 |
23:08:01.84 |
+23:34:25.9 |
HIP 114350 |
21.07 |
| 2026-02-07 00:00 |
23:08:02.89 |
+23:34:26.9 |
HIP 114350 |
20.83 |
| 2026-02-07 12:00 |
23:08:03.96 |
+23:34:28.1 |
HIP 114350 |
20.59 |
| 2026-02-08 00:00 |
23:08:05.02 |
+23:34:29.3 |
HIP 114350 |
20.34 |
| 2026-02-08 12:00 |
23:08:06.09 |
+23:34:30.7 |
HIP 114350 |
20.09 |
| 2026-02-09 00:00 |
23:08:07.17 |
+23:34:32.1 |
HIP 114350 |
19.85 |
| 2026-02-09 12:00 |
23:08:08.25 |
+23:34:33.6 |
HIP 114350 |
19.60 |
| 2026-02-10 00:00 |
23:08:09.33 |
+23:34:35.3 |
HIP 114350 |
19.35 |
| 2026-02-10 12:00 |
23:08:10.42 |
+23:34:37.0 |
HIP 114350 |
19.10 |
| 2026-02-11 00:00 |
23:08:11.52 |
+23:34:38.8 |
HIP 114350 |
18.85 |
| 2026-02-11 12:00 |
23:08:12.61 |
+23:34:40.7 |
HIP 114350 |
18.60 |
| 2026-02-12 00:00 |
23:08:13.71 |
+23:34:42.6 |
HIP 114350 |
18.34 |
| 2026-02-12 12:00 |
23:08:14.82 |
+23:34:44.7 |
HIP 114350 |
18.09 |
| 2026-02-13 00:00 |
23:08:15.93 |
+23:34:46.9 |
HIP 114350 |
17.83 |
| 2026-02-13 12:00 |
23:08:17.04 |
+23:34:49.2 |
HIP 114350 |
17.58 |
| 2026-02-14 00:00 |
23:08:18.16 |
+23:34:51.5 |
HIP 114350 |
17.32 |
| 2026-02-14 12:00 |
23:08:19.28 |
+23:34:53.9 |
HIP 114350 |
17.06 |
| 2026-02-15 00:00 |
23:08:20.41 |
+23:34:56.5 |
HIP 114350 |
16.80 |
| 2026-02-15 12:00 |
23:08:21.54 |
+23:34:59.1 |
HIP 114350 |
16.54 |
| 2026-02-16 00:00 |
23:08:22.67 |
+23:35:01.8 |
HIP 114350 |
16.28 |
| 2026-02-16 12:00 |
23:08:23.81 |
+23:35:04.6 |
HIP 114350 |
16.02 |
| 2026-02-17 00:00 |
23:08:24.94 |
+23:35:07.5 |
HIP 114350 |
15.76 |
| 2026-02-17 12:00 |
23:08:26.09 |
+23:35:10.5 |
HIP 114350 |
15.50 |
| 2026-02-18 00:00 |
23:08:27.23 |
+23:35:13.6 |
HIP 114350 |
15.23 |
| 2026-02-18 12:00 |
23:08:28.38 |
+23:35:16.7 |
HIP 114350 |
14.97 |
| 2026-02-19 00:00 |
23:08:29.53 |
+23:35:20.0 |
HIP 114350 |
14.71 |
| 2026-02-19 12:00 |
23:08:30.68 |
+23:35:23.3 |
HIP 114350 |
14.44 |
| 2026-02-20 00:00 |
23:08:31.84 |
+23:35:26.7 |
HIP 114350 |
14.18 |
| 2026-02-20 12:00 |
23:08:33.00 |
+23:35:30.3 |
HIP 114350 |
13.91 |
| 2026-02-21 00:00 |
23:08:34.16 |
+23:35:33.9 |
HIP 114350 |
13.65 |
| 2026-02-21 12:00 |
23:08:35.33 |
+23:35:37.5 |
HIP 114350 |
13.38 |
| 2026-02-22 00:00 |
23:08:36.49 |
+23:35:41.3 |
HIP 114350 |
13.12 |
| 2026-02-22 12:00 |
23:08:37.66 |
+23:35:45.2 |
HIP 114350 |
12.85 |
| 2026-02-23 00:00 |
23:08:38.83 |
+23:35:49.1 |
HIP 114350 |
12.58 |
| 2026-02-23 12:00 |
23:08:40.01 |
+23:35:53.2 |
HIP 114350 |
12.32 |
| 2026-02-24 00:00 |
23:08:41.18 |
+23:35:57.3 |
HIP 114350 |
12.05 |