| 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) |
| 2026-09-20 00:00 |
23:08:35.42 |
+24:09:06.3 |
HIP 114351 |
14.89 |
| 2026-09-20 12:00 |
23:08:34.21 |
+24:08:58.4 |
HIP 114351 |
15.20 |
| 2026-09-21 00:00 |
23:08:33.00 |
+24:08:50.5 |
HIP 114351 |
15.50 |
| 2026-09-21 12:00 |
23:08:31.80 |
+24:08:42.5 |
HIP 114351 |
15.81 |
| 2026-09-22 00:00 |
23:08:30.60 |
+24:08:34.4 |
HIP 114351 |
16.11 |
| 2026-09-22 12:00 |
23:08:29.40 |
+24:08:26.2 |
HIP 114351 |
16.42 |
| 2026-09-23 00:00 |
23:08:28.20 |
+24:08:18.0 |
HIP 114351 |
16.72 |
| 2026-09-23 12:00 |
23:08:27.01 |
+24:08:09.7 |
HIP 114351 |
17.03 |
| 2026-09-24 00:00 |
23:08:25.82 |
+24:08:01.4 |
HIP 114351 |
17.33 |
| 2026-09-24 12:00 |
23:08:24.63 |
+24:07:53.0 |
HIP 114351 |
17.64 |
| 2026-09-25 00:00 |
23:08:23.44 |
+24:07:44.5 |
HIP 114351 |
17.94 |
| 2026-09-25 12:00 |
23:08:22.26 |
+24:07:36.0 |
HIP 114351 |
18.25 |
| 2026-09-26 00:00 |
23:08:21.08 |
+24:07:27.5 |
HIP 114351 |
18.55 |
| 2026-09-26 12:00 |
23:08:19.91 |
+24:07:18.8 |
HIP 114351 |
18.86 |
| 2026-09-27 00:00 |
23:08:18.73 |
+24:07:10.1 |
HIP 114351 |
19.16 |
| 2026-09-27 12:00 |
23:08:17.56 |
+24:07:01.4 |
HIP 114351 |
19.47 |
| 2026-09-28 00:00 |
23:08:16.40 |
+24:06:52.6 |
HIP 114351 |
19.77 |
| 2026-09-28 12:00 |
23:08:15.23 |
+24:06:43.7 |
HIP 114351 |
20.07 |
| 2026-09-29 00:00 |
23:08:14.07 |
+24:06:34.8 |
HIP 114351 |
20.38 |
| 2026-09-29 12:00 |
23:08:12.92 |
+24:06:25.8 |
HIP 114351 |
20.68 |
| 2026-09-30 00:00 |
23:08:11.76 |
+24:06:16.8 |
HIP 114351 |
20.98 |
| 2026-09-30 12:00 |
23:08:10.61 |
+24:06:07.7 |
HIP 114351 |
21.28 |
| 2026-10-01 00:00 |
23:08:09.47 |
+24:05:58.6 |
HIP 114351 |
21.59 |
| 2026-10-01 12:00 |
23:08:08.33 |
+24:05:49.4 |
HIP 114351 |
21.89 |
| 2026-10-02 00:00 |
23:08:07.19 |
+24:05:40.1 |
HIP 114351 |
22.19 |
| 2026-10-02 12:00 |
23:08:06.06 |
+24:05:30.8 |
HIP 114351 |
22.49 |
| 2026-10-03 00:00 |
23:08:04.93 |
+24:05:21.5 |
HIP 114351 |
22.79 |
| 2026-10-03 12:00 |
23:08:03.80 |
+24:05:12.1 |
HIP 114351 |
23.09 |
| 2026-10-04 00:00 |
23:08:02.68 |
+24:05:02.7 |
HIP 114351 |
23.39 |
| 2026-10-04 12:00 |
23:08:01.57 |
+24:04:53.2 |
HIP 114351 |
23.69 |
| 2026-10-05 00:00 |
23:08:00.46 |
+24:04:43.6 |
HIP 114351 |
23.99 |
| 2026-10-05 12:00 |
23:07:59.35 |
+24:04:34.0 |
HIP 114351 |
24.28 |
| 2026-10-06 00:00 |
23:07:58.25 |
+24:04:24.4 |
HIP 114351 |
24.58 |
| 2026-10-06 12:00 |
23:07:57.15 |
+24:04:14.7 |
HIP 114351 |
24.88 |
| 2026-10-07 00:00 |
23:07:56.06 |
+24:04:05.0 |
HIP 114351 |
25.17 |
| 2026-10-07 12:00 |
23:07:54.97 |
+24:03:55.2 |
HIP 114351 |
25.47 |
| 2026-10-08 00:00 |
23:07:53.89 |
+24:03:45.4 |
HIP 114351 |
25.76 |
| 2026-10-08 12:00 |
23:07:52.81 |
+24:03:35.5 |
HIP 114351 |
26.06 |
| 2026-10-09 00:00 |
23:07:51.74 |
+24:03:25.6 |
HIP 114351 |
26.35 |
| 2026-10-09 12:00 |
23:07:50.67 |
+24:03:15.7 |
HIP 114351 |
26.64 |
| 2026-10-10 00:00 |
23:07:49.61 |
+24:03:05.7 |
HIP 114351 |
26.93 |
| 2026-10-10 12:00 |
23:07:48.55 |
+24:02:55.7 |
HIP 114351 |
27.23 |
| 2026-10-11 00:00 |
23:07:47.50 |
+24:02:45.6 |
HIP 114351 |
27.52 |